34 results on '"Voelskow, M."'
Search Results
2. Diffusion and Interaction of In and As Implanted into SiO2 Films
- Author
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Tyschenko, I. E., Voelskow, M., Mikhaylov, A. N., and Tetelbaum, D. I.
- Published
- 2019
- Full Text
- View/download PDF
3. Strain and Band-Gap Engineering in Ge-Sn Alloys via P Doping
- Author
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Prucnal, S., Berencén, Y., Wang, M., Grenzer, J., Voelskow, M., Hübner, R., Yamamoto, Y., Scheit, A., Bärwolf, F., Zviagin, V., Schmidt-Grund, R., Grundmann, M., Żuk, J., Turek, M., Droździel, A., Pyszniak, K., Kudrawiec, R., Polak, M. P., Rebohle, L., Skorupa, W., Helm, M., and Zhou, S.
- Subjects
GeSn ,Condensed Matter::Materials Science ,Condensed Matter - Materials Science ,Ge ,strain ,x-ray diffraction ,Raman spectroscopy ,Materials Science (cond-mat.mtrl-sci) ,FOS: Physical sciences ,ion implantation ,n-type doping - Abstract
Ge with a quasi-direct band gap can be realized by strain engineering, alloying with Sn, or ultrahigh n-type doping. In this work, we use all three approaches together to fabricate direct-band-gap Ge-Sn alloys. The heavily doped n-type Ge-Sn is realized with CMOS-compatible nonequilibrium material processing. P is used to form highly doped n-type Ge-Sn layers and to modify the lattice parameter of P-doped Ge-Sn alloys. The strain engineering in heavily-P-doped Ge-Sn films is confirmed by x-ray diffraction and micro Raman spectroscopy. The change of the band gap in P-doped Ge-Sn alloy as a function of P concentration is theoretically predicted by density functional theory and experimentally verified by near-infrared spectroscopic ellipsometry. According to the shift of the absorption edge, it is shown that for an electron concentration greater than 1x10^20 cm-3 the band-gap renormalization is partially compensated by the Burstein-Moss effect. These results indicate that Ge-based materials have high potential for use in near-infrared optoelectronic devices, fully compatible with CMOS technology., 20 pages, 6 figures
- Published
- 2019
4. Ex situ n+ doping of GeSn alloys via non-equilibrium processing
- Author
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Prucnal, S., Berencén, Y., Wang, M., Rebohle, L., Böttger, R., Fischer, I. A., Augel, L., Oehme, M., Schulze, J., Voelskow, M., Helm, M., Skorupa, W., and Zhou, S.
- Subjects
GeSn ,Ge ,MBE ,flash lamp annealing ,ion implantation ,n-type doping - Abstract
Full integration of Ge-based alloys like GeSn with complementary-metal-oxide-semiconductor technology would require the fabrication of p- and n-type doped regions for both planar and tri-dimensional device architectures which is challenging using in situ doping techniques. In this work, we report on the influence of ex situ doping on the structural, electrical and optical properties of GeSn alloys. n-type doping is realized by P implantation into GeSn alloy layers grown by molecular beam epitaxy (MBE) followed by flash lamp annealing. We show that effective carrier concentration of up to 1 × 10^19 cm−3 can be achieved without affecting the Sn distribution. Sn segregation at the surface accompanied with an Sn diffusion towards the crystalline/amorphous GeSn interface is found at P fluences higher than 3 × 10^15 cm−2 and electron concentration of about 4 × 10^19 cm−3. The optical and structural properties of ion-implanted GeSn layers are comparable with the in situ doped MBE grown layers.
- Published
- 2018
5. Optoelectronic properties of ultra-doped Ge fabricated by ion implantation and flash lamp annealing
- Author
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Prucnal, S., Berencén, Y., Heera, V., Voelskow, M., Yuan, Y., Wang, M., Poddar, V., Mazur, G. P., Grzybowski, M., Zgirski, M., Sawicki, M., Hübner, R., Zhou, S., and Skorupa, W.
- Subjects
Ge ,FLA ,ion implantation ,n-type - Abstract
Independent of the type of doping, it is challenging to achieve in semiconductors an effective carrier concentration much above 10^20 /cm3. On the other hand, the successful realization of defect free n-type and p-type ultra-doped Ge layers will enable a range of devices from sensors to quantum computers. In the case of conventional doping techniques (using equilibrium processing) the maximum carrier concentration is limited by the out-diffusion of dopants, a relatively low solid solubility limit, clustering and self-compensation processes. To overcome such limitations we have utilised strong nonequilibrium process consisting of an ion beam implantation to introduce dopants into Ge and rear-side millisecond range flash lamp annealing (FLA) for recrystallization of implanted layer and dopant activation. In contrast to conventional annealing procedures, rear-side FLA leads to full recrystallization of Ge and dopant activation independent of the pre-treatment. The maximum carrier concentration is well above 10^20 /cm3 for n-type and above 10^21 /cm3 for p-type dopants. The so-fabricated n-type Ge can be used in the field of mid-infrared plasmonics which has not been accessible by group-IV semiconductors. Single crystalline n-type Ge with carrier concentrations as high as 2.2×10^20 /cm3 displays a room-temperature plasma frequency above 1850 /cm1 (?=5.4 ?m), which is the highest value ever reported for n-type Ge. In the case of Ga implanted Ge the maximum effective carrier concentration measured at 3K is 1.1×10^21 /cm3 which is two times higher than the solid solubility limit of Ga in Ge. Our p-type Ge is defect and cluster free and shows the superconductivity at Tc = 0.95 K. These results base on the successful combination of ion beam implantation followed by the novel approach consisting of millisecond range rear-FLA. This work has been partially supported by the EU 7th Framework Programme "EAgLE" (REGPOT-CT-2013-316014).
- Published
- 2016
6. Mid-infrared plasmonic absorption from heavily doped Ge thin films
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Berencén, Y., Liu, F., Lang, D., Voelskow, M., Skorupa, I., Kehr, S., Rebohle, L., Helm, M., Skorupa, W., Zhou, S., and Prucnal, S.
- Subjects
Ion implantation ,FLA ,Ultra-doped Ge ,Plasmonics - Abstract
Exploiting plasmonics for mid-IR sensing purposes has become an increasing area of research. The reason is that many molecules present molecular vibrational resonances, which provide spectral fingerprints in the near- and mid-IR region [1, 2]. Of particular interest is the gas detection, diagnostic and medical care. To this day, strong plasmon resonances in the visible and near-IR spectral range have been identified in nanostructured metals such as silver, aluminum and gold [3]. In principle, heavily doped semiconducting materials like Si or Ge could be an interesting alternative to replace metals due to their compatibility with CMOS technology. Indeed, the possibility to control the plasmon resonance frequency in semiconductors via the carrier density opens new route for near- and mid-IR detectors. In this work, we report on the strong mid-IR plasmon absorption from heavily P-doped Ge thin films obtained by non-equilibrium thermal processing. Ultra-doped Ge layers were fabricated by ion implantation of P ions followed by rear-side flash lamp annealing in the millisecond range. This approach, in contrast to conventional annealing procedures, leads to full recrystallization of Ge films and high P activation irrespective of pre-treatment. In this way, single crystalline Ge thin films free of defects with carrier concentration much above 1×1020 cm-3 and carrier mobility above 260 cm2/(V·s) were obtained. The mid-IR plasmon spectral response at room temperature from those samples was characterized by means of Fourier transform infrared spectroscopy. It is proven that the position of the signal from the plasmon resonance frequency can be tuned as a function of the P concentration. Keywords: plasmonics, heavily doped n-type Ge, flash-lamp annealing. [1] A. G. Brolo, Nat. Photonics 6, 709 (2012). [2] N. Liu, M. Mesch, T. Weiss, M. Hentschel, and H. Giessen, Nano Lett. 10, 2342 (2010). [3] G. Konstantatos and E. H. Sargent, Nat. Nanotechnology 5, 391 (2010).
- Published
- 2016
7. Diffusion and Interaction of In and As Implanted into SiO2 Films.
- Author
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Tyschenko, I. E., Voelskow, M., Mikhaylov, A. N., and Tetelbaum, D. I.
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ANNEALING of metals , *DIFFUSION , *DIFFUSION coefficients - Abstract
By means of Rutherford backscattering spectrometry, electron microscopy, and energy-dispersive X-ray spectroscopy, the distribution and interaction of In and As atoms implanted into thermally grown SiO2 films to concentrations of about 1.5 at % are studied in relation to the temperature of subsequent annealing in nitrogen vapors in the range of T = 800–1100°C. It is found that annealing at T = 800–900°C results in the segregation of As atoms at a depth corresponding to the As+-ion range and in the formation of As nanoclusters that serve as sinks for In atoms. An increase in the annealing temperature to 1100°C yields the segregation of In atoms at the surface of SiO2 with the simultaneous enhanced diffusion of As atoms. The corresponding diffusion coefficient is DAs = 3.2 × 10–14 cm2 s–1. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
8. Comparison of the room temperature 1.53 μm Er photoluminescence from flash lamp and furnace annealed Er-doped Ge-rich SiO2 layers.
- Author
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Kanjilal, A., Prucnal, S., Rebohle, L., Voelskow, M., Helm, M., and Skorupa, W.
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PHOTOLUMINESCENCE ,ENERGY transfer ,RECRYSTALLIZATION (Metallurgy) ,TEMPERATURE ,RARE earth ions ,ION implantation ,METAL oxide semiconductors ,LIGHT emitting diodes - Abstract
The furnace and flash-lamp annealing (FLA) temperature dependent variation in the room temperature 1.53 μm Er photoluminescence (PL) from Er-doped Ge-rich SiO
2 layers is investigated. The appearance of the 1.53 μm Er PL is discussed in the framework of the phonon-assisted fluorescent resonant energy transfer from Ge-related luminescence-centers (LCs) to the Er3+ . Detailed analyses suggest that in case of FLA the decrease in the 1.53 μm Er PL intensity is governed by the temperature dependent recrystallization of Ge nanoclusters, while for furnace-annealing it is associated with the reduction in the LC-Er3+ coupling due to Ge out-diffusion and the formation of Er-rich clusters with increasing temperature. [ABSTRACT FROM AUTHOR]- Published
- 2010
- Full Text
- View/download PDF
9. Conductivity type and crystal orientation of GaAs nanocrystals fabricated in silicon by ion implantation and flash lamp annealing
- Author
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Prucnal, S., Liedke, M. O., Zhou, S., Voelskow, M., Mucklich, A., Turek, M., Zuk, J., and Skorupa, W.
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Condensed Matter::Materials Science ,Silicon ,Condensed Matter::Other ,Quantum dots ,Ion implantation ,GaAs ,Physics::Optics ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,Flash lamp annealing - Abstract
The integration of III-V semiconductor material within silicon technology is crucial for performance of advanced electronic devices. This paper presents the investigations of microstructural and opto-electronic properties of GaAs quantum dots (QDs) formed in silicon by means of sequential ion implantation and flash lamp annealing (FLA). Formation of crystalline GaAs QDs with well-defined crystal orientation and conductivity type was confirmed by high resolution transmission electron microscopy and mu-Raman spectroscopy. The influence of the post implantation millisecond-range annealing on the evolution of the nanoparticles size, shape, crystallographic orientation and doping type of GaAs QDs is discussed.
- Published
- 2013
10. Conductivity type and crystal orientation of GaAs nanocrystals in silicon
- Author
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Prucnal, S., Voelskow, M., Mücklich, A., Liedke, M. O., Pyszniak, K., Drozdziel, A., Turek, M., Zuk, J., and Skorupa, W.
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Condensed Matter::Materials Science ,Condensed Matter::Other ,GaAs ,flash lamp annealing ,Physics::Optics ,silicon ,ion implantation ,quantum dots ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect - Abstract
Semiconductors quantum dots of the size in the range of the exciton Bohr radius or smaller are very attractive objects, both for research and application, due to their special optical and electrical properties. In this paper we present investigations of microstructural, electrical and optical properties of GaAs quantum dots (QDs) formed in silicon. The GaAs QDs were obtained by means of sequential ion implantation and flash lamp annealing (FLA). It is shown that the crystallographic orientation of nanocrystals (NCs) and their size can be controlled by varying the annealing parameters. Besides the crystallographic orientation the conductivity type of the GaAs NCs can be controlled as well. The influence of the post implantation millisecond-range annealing on the evolution of the nanoparticles size, shape, crystallographic orientation and doping type of GaAs QDs is discussed.
- Published
- 2012
11. Flash lamp processing of III/V nanostructures in silicon
- Author
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Turek, M., Prucnal, S., Voelskow, M., Mücklich, A., Liedke, M. O., Pyszniak, K., Drozdziel, A., Zuk, J., and Skorupa, W.
- Subjects
III-V quantum dots ,flash lamp annealing ,silicon ,ion implantation - Abstract
Conventionally, the integration of III-V semiconductors with silicon is based on heteroepitaxial growth of multi-layered structures on silicon. But up to now the modification of the optoelectronic properties of silicon in the microelectronic industry is based on the ion implantation method and subsequent thermal annealing. An alternative technique to the epitaxial growth of III-V nanostructures is the high fluence ion implantation followed by milliseconds range annealing. Potentially, with this method any kind of compound semiconductors can be formed in any solid substrate. InP and GaAs with a bulk band gap of 1.34 and 1.42 eV at room temperature, respectively, are most suitable for near infrared light emitters, and InAs (0.35 eV) with an extremely high electron mobility (up to 40000 cm2/Vs) seems to be the most suitable candidate for better electronic devices performance. In this paper formation of the InAs, GaAs and InP nanocrystals in silicon are presented. The optoelectronic and microstructural properties of the compound semiconductors nanostructures were investigated by means of -Raman and temperature dependent photoluminescence spectroscopy, X-ray diffraction, high-resolution transmission electron microscopy (HRTEM) and energy-dispersive X-ray spectroscopy (EDS). It is show that conductivity type, size and crystallographic orientation of the III-V nanostructures can be fully controlled by varying implantation and annealing parameters. Finally the heterojunction devices consisting of III-V NCs on a silicon finger realized by selective etching of silicon will be presented.
- Published
- 2012
12. The formation of near surface SiGe layers with combined high-dose ion implantation and flash-lamp annealing
- Author
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Voelskow, M., Stoimenos, I., Rebohle, L., and Skorupa, W.
- Subjects
SiGe ,fungi ,flash lamp annealing ,TEM ,ion implantation ,RBS - Abstract
The formation of near surface SiGe layers by means of combined high dose Ge ion implantation and flash lamp annealing will be addressed. Furthermore, we show that the formation of an undesirable facetted liquid/solid in-terface, which is well known for pulse melting in the mil-lisecond time regime, is less pronounced due to the de-creasing melting temperature of Si with increasing Ge concentration at the SiGe/Si interface. A dislocation net-work, which is observed by using transmission electron microscopy, is expected to play an important role to form these thin SiGe layers. We will demonstrate the depth profiles of Ge by Rutherford backscattering spectrometry and discuss the concerned mechanism.
- Published
- 2011
13. Wear-out phenomena in Si-based light emitting devices with ion beam implanted europium
- Author
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Lehmann, J., Rebohle, L., Kanjilal, A., Voelskow, M., Helm, M., and Skorupa, W.
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Electroluminescence ,Europium ,rare earth ,charge trapping ,Si-based light emission ,quenching ,ion implantation ,Electroluminescence wear-out - Abstract
Recently, it was shown that it is possible to obtain efficient electroluminescence (EL) from UV to IR by implanting lanthanides into the oxide layer of metal-oxide semiconductor (MOS) structures [1]. The best efficiencies could be achieved on a Tb-implanted light emitter with an external quantum efficiency of 16% and a corresponding power efficiency of 0.3%. With these electrically driven Si-based light emitting devices, also called MOSLEDs, it is possible to build an integrated biosensor for the detection of organic molecules like estrogene, e.g. see Ref. [2]. For this purpose, the intensity and stability of the emitted EL are the most critical properties of the light emitters. Usually, lanthanide implanted MOSLEDs show a quenching of the EL-signal with time, which can be attributed to charge trapping in the oxide layer. In contrast to this normal wear-out phenomenon, Eu-implanted MOSLEDs can show a rise in the EL-signal during the operation time of the device [3]. Due to this anomalous wear-out phenomenon, Eu-implanted MOSLEDs offer the possibility to build a device with an extremely stable EL if the occurring processes can be better understood. For this reason, an intensive investigation was performed on Eu-implanted MOSLEDs exposed to different annealing temperatures and times. Transmission electron microscopy (TEM) and Rutherford backscattering spectroscopy (RBS) were used to trace the growth of Eu / Eu oxide clusters and the diffusion of Eu to the interfaces of the gate oxide layer, respectively. Both of them were induced by the annealing process. Resonant nuclear reaction analysis (rNRA) was used to measure the hydrogen depth profile in the dielectric. Current-voltage (I-V) characteristics, the EL decay times (τ) and the evolution of the voltage under constant current injection (Vcc) as well as the evolution of the EL spectrum with injected charge (EL-Qinj) were studied with respect to charging and trapping phenomena in the oxide layer in order to reveal details in the occurring wear-out mechanism of the EL. It will be shown, that for certain annealing conditions the EL intensity of Eu-implanted SiO2 layers can increase during constant current injection which is followed by the known EL quenching. In extreme cases this rise may amount up to two orders of magnitude. The EL behaviour will be correlated with the microstructural and electrical properties of the devices. A qualitative model for the anomalous wear-out phenomenon is proposed.
- Published
- 2010
14. Ion implantation enhanced formation of 3C-SiC grains at the SiO2/Si interface after annealing in CO gas
- Author
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Pécz, B., Stoemenos, J., Voelskow, M., Skorupa, W., Dobos, L., Pongrácz, A., and Battistig, G.
- Subjects
Condensed Matter::Materials Science ,annealing in CO ,3C-SiC formation of carbide ,ion implantation - Abstract
Silicon carbide with its hexagonal and cubic polytypes is one of the wide band-gap semiconductors used for high temperature applications. Obviously the growth of cubic SiC on Si would be very advantageous, because very large, high quality substrates would then be available at relatively low cost.
- Published
- 2009
15. Growth and Electrical Properties of the (Si/Ge)-on-Insulator Structures Formed by Ion Implantation and Subsequent Hydrogen-Assisted Transfer
- Author
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Tyschenko, I. E., Voelskow, M., Cherkov, A. G., and Popov, V. P.
- Subjects
Electrical Properties ,Hydrogen Transfer ,Ion Implantation ,Si/Ge - Abstract
Systematic features of endotaxial growth of intermediate germanium layers at the bonding interface in the silicon-on-insulator structure consisting of buried SiO2 layer implanted with Ge+ ions are studied in relation to the annealing temperature. On the basis of the results for high-resolution electron microscopy and thermodynamic analysis of the Si/Ge/SiO2 system it is assumed that the endotaxial growth of the Ge layer occurs via formation of a melt due to enhanced segregation and accumulation of Ge at the Si/SiO interface. Effect of germanium at the bonding interface on the Hall mobility of holes in silicon layers with nanometer-scale thickness is studied. It is found that the structures including the top silicon layer with the thickness 320 nm and incorporating germanium feature the hole mobility that exceeds by a factor of 23 the hole mobility in corresponding Ge-free silicon-on-insulator structures.
- Published
- 2009
16. Povedenie germanii, implantirovannovo v SiO2 vblisi granizui sraschivania kremnii na isolatore Behavior of Germanium Ion-implanted into SiO2 Near the Bonding Interface of a Silicon-on-Insulator Structure
- Author
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Popov, V. P., Tyschenko, E., Voelskow, M., and Cherkov, A. G.
- Subjects
germanium ,ion implantation ,SiO2 - Abstract
issledovanui svoistva germanii, implantirovannovo v sloi SiO2 The properties of germanium implanted into the SiO2 layers in the vicinity of the bonding interface of silicon-on-insulator structures are studied. It is shown that, under conditions of high-temperature (1100 °C) annealing, germanium nanocrystals are not formed, while the implanted Ge atoms segregate at the Si/SiO2 bonding interface. It is established that, in this case, Ge atoms are found at sites that are coherent with the lattice of the top silicon layer. In this situation, the main type of traps is the positive-charge traps; their effect is interpreted in the context of an increase in the surface-state density due to the formation of weaker GeO bonds. It is found that the slope of the draingate characteristics of the back MIS transistors increases; this increase is attributed to an increased mobility of holes due to the contribution of an intermediate germanium layer formed at the Si/SiO2 interface.
- Published
- 2007
17. Silicon-Germanium Heterostructure-on-Insulator formed by Ge+ Ion Implantation and Hydrogen Transfer
- Author
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Popov, V. P., Tyschenko, I., Cherkov, A., and Voelskow, M.
- Subjects
Si-Ge heterostructures ,ion implantation - Abstract
Using bulk silicon can be ended for 32 nm technological nodes. New type of substrates needs for further scaling in CMOS microelectronics. We speculate that these new type of materials will be semiconductor heterostructure on insulator (SHI) compatible with current silicon planar CMOS technology. Joint semiconductor material stack placed on cheap amorphous dioxide is presented. First of all thin film SiGe heterostructure properties is considered. It was obtain using Ge ion implantation in dioxide with followed Ge segregation to the directly bonded interface between silicon and silicon dioxide wafers. The method is also compatible with A3B5 thin film formation.
- Published
- 2006
18. Excess vacancies induced by ion beam implantation into silicon
- Author
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Kögler, R., Eichhorn, F., Peeva, A., Voelskow, M., Mücklich, A., Serre, C., and Skorupa, W.
- Subjects
Excess vacancies ,Positron annihilation spectrometry ,Silicon ,Ion implantation ,Electron microscopy - Abstract
The process of formation of excess vacancies by ion implantation is explained. Moreover, the simulation of the process, the experimental detection of excess vacancies and their application for defect engineering is described.
- Published
- 2004
19. Ion-Beam-Assisted Nanocrystal Formation in Silicon Implanted with High Doses of Pb+ and Bi+ Ions
- Author
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Kalitzova, M., Zollo, G., Yankov, R., Angelov, C., Simov, S., Pizzuto, C., Faure, J., Kilian, L., Bonhomme, P., Daniela Manno, Voelskow, M., and Vitali, G.
- Subjects
electron microscopy ,nanoclusters ,silicon ,ion implantation ,precipitation - Abstract
In this paper we discuss ion-beam-assisted nanocrystal nucleation in amorphized silicon (a-Si) layers produced by high-dose implantation of Pb+ and Bi+. (100)-oriented Si wafers were implanted at room temperature (RT) with 50 keV Pb+ and Bi+ ions at doses ranging from 5E13 to 1E18 cm−2 and a constant ion current density of 10μAcm−2. The resulting structures were studied by conventional transmission electron microscopy (CTEM), high resolution transmission electron microscopy (HRTEM) and Rutherford backscattering spectroscopy (RBS) in combination with computer simulations. The dynamics of the ion-beam-induced crystallization of new phases and precipitates evolution in the implanted layer were studied as a function of implant dose. It is established that the front of the new phase crystallization (cubic Pb and hexagonal Bi nanocrystals) starts approximately at the peaks of the implanted species profiles; the crystallography of the nucleated nanocrystal is examined as a function of the dose.
- Published
- 2001
20. Micro-Raman and Ion Channeling Study of Crystal Damage in Si Induced by Focused Ion Beam Co Implantation
- Author
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Teichert, J., Bischoff, L., Hausmann, S., Voelskow, M., and Hobert, H.
- Subjects
focused ion beam ,radiation damage ,ion channeling analysis ,ion implantation ,micro-Raman spectroscopy ,cobalt implantation - Abstract
The lattice damage of silicon produced by ion implantation at extremely high current density of 0.8 A/cm2 (2.5 x 1018 cm-2 s-1) was investigated. In a focused ion beam system, implantation was carried out with 70 keV Co ions, fluences of 1.2 x 1016 cm-2 and 6.7 x 1015 cm-2 into Si (111) at room temperature and elevated temperatures between 355 °C and 400 °C. Radiation damage measurements were performed by Rutherford backscattering/channeling spectroscopy and micro-Raman analysis. The radiation damage was studied as a function of pixel dwell-time and implantation temperature. The critical temperature for amorphization increases with current density. Although the fluence of the focused ion implantation was constant, crystalline layers were obtained for short and amorphous layers for long pixel dwell-times. The critical dwell-time of crystalline/amorphous transition increases with implantation temperature. From the results a typical time for defect annealing of 10-5 s at 400 °C and an activation energy of (2.5±0.6) eV were deduced.
- Published
- 2000
21. Photoluminescensia plenok Si3N4 implantirovannich ionami Ge+ i Ar+
- Author
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Tyschenko, I. E., Volodin, V. A., Rebohle, L., Voelskow, M., and Skorupa, W.
- Subjects
photoluminescence ,ion implantation ,annealing ,Si3N4 - Abstract
Spektri emissii i wosbuschdenia photoluminescencii pri komnatnoi temperature plenok Si3N4 implantirovannich plenok Ge+ i Ar+, issledovanui v savisimosti ot dosui ionov i temperaturui posledujuschego otschiga.
- Published
- 1999
22. Computer simulation and RBS/C studies of high-dose N + and Al + co-implantation in 6H-SiC
- Author
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Kharlamov, V. S., Kulikov, D. V., Truschin, Y. V., Tsigankov, D. N., Voelskow, M., Skorupa, W., and Pezoldt, J.
- Subjects
6H-SiC ,stomatognathic system ,ion implantation ,Computer simulation ,RBS - Abstract
Computer simulation and RBS/C studies of high-dose N + and Al + co-implantation in 6H-SiC
- Published
- 1998
23. High-temperature high-dose implantation of N- and Al+ ions in 6HSiC
- Author
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Yankov, R. A., Voelskow, M., Kreissig, W., Kulikov, D. V., Pezoldt, J., Skorupa, W., Trushin, Y. V., Kharlamov, V. S., and Tsigankov, D. N.
- Subjects
6H-SiC ,TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY ,ion implantation - Abstract
A series of experimental and theoretical investigations has been initiated for 6HSiC samples sequentially implanted with high doses of N+(65 keV) + N+(120 keV) + Al+(100 keV) + Al+(160 keV) ions at temperatures between 200 and 800 °C. Nitrogen and carbon distribution profiles are measured by ERD and structural defect distributions are measured by Rutherford backscattering with channeling. A comparison between the experimental data and the results of computer simulation yields a physical model to describe the relaxation processes of the implanted SiC structure, where the entire implanted volume is divided into regions of different depth, having different guiding kinetics mechanisms.
- Published
- 1997
24. Formation of dendritic crystal structures in thin silicon films on silicon dioxide by carbon ion implantation and high intensity large area flash lamp irradiation.
- Author
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Voelskow, M., Endler, R., Schumann, T., Mücklich, A., Ou, X., Liepack, E.H., Gebel, T., Peeva, A., and Skorupa, W.
- Subjects
- *
DENDRITIC crystals , *CRYSTAL structure , *SILICON , *METALLIC thin films , *SILICA , *RING formation (Chemistry) , *CARBON , *ION implantation - Abstract
Abstract: In this paper, we use large area light pulse induced melting of deposited thin silicon films on oxidised silicon wafers to prepare coarse grained dendritic crystal structures. The results show that the addition of carbon prevents the agglomeration of the molten silicon films and largely influences the crystallisation process. The low solubility of carbon in liquid silicon and its effect on the silicon melting temperature induces a distinctive lateral dendritic grain growth. XTEM, SEM, AFM and ToF-SIMS investigations have been performed to study the crystallisation process and to characterise the resulting film structure. [Copyright &y& Elsevier]
- Published
- 2014
- Full Text
- View/download PDF
25. Epitaxial 3C-SiC nanocrystal formation at the SiO2/Si interface after carbon implantation and subsequent annealing in CO atmosphere
- Author
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Voelskow, M., Pécz, B., Stoemenos, J., and Skorupa, W.
- Subjects
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CRYSTAL growth , *NANOCRYSTALS , *SILICON carbide , *ION implantation , *ANNEALING of crystals , *CARBON dioxide , *NUCLEATION - Abstract
Abstract: 3C-SiC nanocrystallites were epitaxially formed on a single crystalline Si surface covered by a 150nm thick SiO2 capping layer after low dose carbon implantation and subsequent high temperature annealing in CO atmosphere. Carbon implantation is used to introduce nucleation sites by forming silicon–carbon clusters at the SiO2/Si interface facilitating the growth of 3C-SiC nanocrystallites. [Copyright &y& Elsevier]
- Published
- 2009
- Full Text
- View/download PDF
26. Endotaxial growth of InSb nanocrystals at the bonding interface of the In+ and Sb+ ion implanted SOI structure
- Author
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Tyschenko, I.E., Voelskow, M., Cherkov, A.G., and Popov, V.P.
- Subjects
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CRYSTAL growth , *NANOCRYSTALS , *SILICON oxide , *ION implantation , *SILICON-on-insulator technology , *ANNEALING of crystals , *HYDROGEN , *NANOSTRUCTURES - Abstract
Abstract: Growth of InSb nanocrystals at the Si/SiO2 bonding interface of silicon-on-insulator (SOI) structures has been studied as a function of the annealing temperature. SOI structures with the ion implanted regions above and below the bonding interface were produced as a result of the hydrogen transfer of the Sb+ ion implanted silicon layer from first silicon substrate to the In+ ion implanted SiO2 layer thermally-grown on the second silicon substrate. Rutherford backscattering spectrometry and high-resolution transmission electron microscopy (XTEM) were used to study the properties of the prepared structures. Up-hill diffusion of In and Sb atoms from the implantation regions toward the bonding interface as well as subsequent interface-mediated growth of InSb nanocrystals were observed as the annealing temperature achieved 1100°C. The strain minimizing orientations of the Si and InSb lattice heteropairs were obtained from XTEM analysis of the grown nanocrystals. [Copyright &y& Elsevier]
- Published
- 2009
- Full Text
- View/download PDF
27. Nanometer-thick SGOI structures produced by Ge+ ion implantation of SiO2 films and subsequent hydrogen transfer of Si layers
- Author
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Tyschenko, I.E., Voelskow, M., Cherkov, A.G., and Popov, V.P.
- Subjects
- *
SILICON-on-insulator technology , *GERMANIUM , *ION implantation , *SILICON oxide films , *HYDROGEN , *ANNEALING of crystals , *NANOSTRUCTURES - Abstract
Abstract: Nanometer-thick silicon-germanium-on-insulator (SGOI) structures have been produced by the implantation of Ge+ ions into thermally grown SiO2 layer and subsequent hydrogen transfer of silicon film on the Ge+ ion implanted substrate. The intermediate nanometer-thick Ge layer has been formed as a result of the germanium atom segregation at the Si/SiO2 bonding interface during annealing at temperatures 800–1100 оС. From a thermodynamic analysis of Si/Ge/SiO2 system, it has been suggested that the growth of the epitaxial Ge layer is provided by the formation of a molten layer at the Si/SiO2 interface due to the Ge accumulation. The effect of germanium on the hole mobility in modulation-doped heterostructures grown over the 3–20nm thick SGOI layers was studied. An increase in the Hall hole mobility in SGOI-based structures by a factor of 3–5 was obtained in comparison with that in respective Ge-free SOI structures. [Copyright &y& Elsevier]
- Published
- 2009
- Full Text
- View/download PDF
28. Micro-Raman and ion channeling study of crystal damage in Si induced by focused Co ion beam implantation.
- Author
-
Teichert, J., Bischoff, L., Hausmann, S., Voelskow, M., and Hobert, H.
- Subjects
SILICON ,ION implantation ,BACKSCATTERING ,RAMAN spectroscopy - Abstract
Abstract. The lattice damage of silicon produced by ion implantation at extremely high current density of 0.8 A/cm[sup 2] (2.5 x 10[sup 18] cm[sup -2] s[sup -1]) was investigated. In a focused ion beam system, implantation was carried out with 70 kev Co ions, fluences of 1.2 x l0[sup 16]cm[sup -2] and 6.7 x 10[sup 15]cm[sup -2] into Si (111) at room temperature and elevated temperatures between 355 Celsius and 400 Celsius. Radiation damage measurements were performed by Rutherford backscattering/channeling spectroscopy and micro-Raman analysis. The radiation damage was studied as a function of pixel dwell-time and implantation temperature. The critical temperature for amorphization increases with current density. Although the fluence of the focused ion implantation was constant, crystalline layers were obtained for short and amorphous layers for long pixel dwell-times. The critical dwell-time of crystalline/amorphous transition increases with implantation temperature. From the results a typical time for deflect annealing of 10[sup-5] s at 400 Celsius and an activation energy of (2.5 +/- 0.6) eV were deduced. [ABSTRACT FROM AUTHOR]
- Published
- 2000
29. Formation of Photoluminescence Centers During Annealing of SiO[sub 2] Layers Implanted with Ge Ions.
- Author
-
Kachurin, G. A., Rebohle, L., Tyschenko, I. E., Volodin, V. A., Voelskow, M., Skorupa, W., and Froeb, H.
- Subjects
SILICA ,ION implantation ,GERMANIUM ,PHOTOLUMINESCENCE - Abstract
Photoluminescence (PL), Raman scattering, and the Rutherford backscattering of α-particles were used to study the formation of the centers of radiative-recombination emission in the visible region of the spectrum on annealing of the SiO[sub 2] layers implanted with Ge ions. It was found that the Ge-containing centers were formed in the as-implanted layers, whereas the stages of increase and decrease in the intensities of PL bands were observed following an increase in the annealing temperature to 800°C. The diffusion-related redistribution of Ge atoms was observed only when the annealing temperatures were as high as 1000°C and was accompanied by formation of Ge nanocrystals. However, this did not give rise to intense PL as distinct from the case of Si-enriched SiO[sub 2] layers subjected to the same treatment. It is assumed that, prior to the onset of Ge diffusion, the formation of PL centers occurs via completion of direct bonds between the neighboring excess atoms, which gives rise to the dominant violet PL band (similar to the PL of O vacancies in SiO[sub 2]) and a low-intensity long-wavelength emission from various Ge-containing complexes. The subsequent formation of centers of PL with λ[sub m] ∼ 570 nm as a result of anneals at temperatures below 800°C is explained by agglomeration of bonded Ge atoms with formation of compact nanocrystalline precipitates. The absence of intense PL following the high-temperature anneals is believed to be caused by irregularities in the interfaces between the formed Ge nanocrystals and the SiO[sub 2] matrix. [ABSTRACT FROM AUTHOR]
- Published
- 2000
- Full Text
- View/download PDF
30. On-chip superconductivity via gallium overdoping of silicon.
- Author
-
Skrotzki, R., Fiedler, J., Herrmannsdörfer, T., Heera, V., Voelskow, M., Mücklich, A., Schmidt, B., Skorupa, W., Gobsch, G., Helm, M., and Wosnitza, J.
- Subjects
INTEGRATED circuits ,SUPERCONDUCTIVITY ,GALLIUM ,SILICON ,SEMICONDUCTOR doping ,SEMICONDUCTOR wafers ,ION implantation ,ANNEALING of crystals ,PRECIPITATION (Chemistry) - Abstract
We report on superconducting properties of gallium-enriched silicon layers in commercial (100) oriented silicon wafers. Ion implantation and subsequent rapid thermal annealing have been applied for realizing gallium precipitation beneath a silicon-dioxide cover layer. Depending on the preparation parameters, we observe a sharp drop to zero resistance at 7 K. The critical-field anisotropy proofs the thin-film character of superconductivity. In addition, out-of-plane critical fields of above 9 T and critical current densities exceeding 2 kA/cm
2 promote these structures to be possible playgrounds for future microelectronic technology. [ABSTRACT FROM AUTHOR]- Published
- 2010
- Full Text
- View/download PDF
31. Implantation induced defects in silicon detected by Cu decoration technique
- Author
-
Kögler, R., Peeva, A., Eichhorn, F., Kaschny, J., Voelskow, M., Skorupa, W., and Hutter, H.
- Subjects
Rp/2 defects ,Ion implantation ,silicon ,TEM specimen preparation ,impurity gettering ,defects ,Cu - Abstract
Cu is especially suitable to decorate defects in silicon. The Cu decoration technique has been applied for the detection of point defect clusters in the RP/2 region of Si+ ion implanted silicon. The results of this technique are compared with the results obtained by other analysis techniques. Nanocavities at RP/2 could be observed only in cross section transmission electron microscopy specimen prepared by cleavage technique. These nanocavities are probably the dominant gettering centres for Cu at RP/2. Small interstitial clusters may exist there as well. The conditions for the formation and for the annealing of the gettering layer at RP/2 have been determined. Impurity gettering at RP/2 can be prevented by a sequence of additional Si+ implantations to balance implantation-induced excess vacancies which are the origin of the nanocavities.
32. Flash lamp annealing of ion implanted silicon
- Author
-
Heinig, K. H., Voelskow, M., Hohmuth, K., Klabes, R., and Woittennek, H.
- Subjects
ION implantation ,SILICON - Published
- 1982
- Full Text
- View/download PDF
33. Ion beam synthesis of SiC in silicon-on-insulator
- Author
-
Voelskow, M [Forschungszentrum Rossendorf, Dresden (Germany); and others]
- Published
- 1996
34. Ion implantation-induced damage depth profile determination in SiC by means of RBS/C and bevelling technique
- Author
-
Romanek, J., Grambole, D., Herrmann, F., Voelskow, M., Posselt, M., Skorupa, W., and Żuk, J.
- Subjects
- *
ION bombardment , *ION implantation , *SIMULATION methods & models , *ELECTRONS - Abstract
Abstract: Ion implantation-induced damage depth profiles of 450keV Al+ ion-implanted 6H-SiC were studied using RBS/C technique for implantations along channeling direction and non-channeling direction with fluence of 3.4×1015 cm−2. Bevelling method of sample preparation was used to get access to the deeper situated layers over the whole damaged region and below. To determine damage degree at the specific depth of the bevelled sample, RBS/C technique combined with a 3MeV Li2+ ion beam of size of about 30μm×30μm was utilized (micro-RBS/C). The micro-RBS/C method combined with the bevelling technique gave us a possibility to probe deeper reaching damage regions than in the case of conventional RBS/C investigations. It also utilizes a near-surface part of backscattered spectra, which is slightly influenced by damage created by probing ions and a random fraction of probing beam. Additionally, there is no need to perform energy calibration of detector for backscattered particles. Due to much smaller sample area hit by probing ions of micro-beam, the required fluence, comparable to that at conventional RBS/C measurements is obtained at much lower charge. Negligibly small effect of bevelling-induced mechanical damage has been observed in this study. The obtained results by micro-RBS/C method validate the results of computer simulations (Crystal-TRIM software). [Copyright &y& Elsevier]
- Published
- 2006
- Full Text
- View/download PDF
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