Author: "Herklotz, F." / Topic: zno - Searchworks@Jio Institute Digital Library Search Results

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Author: Herklotz F., Lavrov E., Weber J., Mamin G., Kutin Y., Volodin M., and Orlinskii S.
Subjects: ZnO, EPR, ENDOR, Aluminum
Abstract: A combined magnetic resonance, photoluminescence, photoconductivity, and Raman scattering study of ZnO is presented. Electron paramagnetic resonance (EPR) and electron-nuclear double resonance (ENDOR) spectroscopy identify substitutional Al as a binding core of a shallow, effective-mass-like donor in ZnO. Based on the correlation between the EPR and photoluminescence data it is shown that recombination of an exciton bound to Al gives rise to the 3360.7meV photoluminescence line (I 6). A 1s→ 2p donor transition at 316cm -1 is detected in photoconductivity and Raman spectra. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Published: 2011

Author: Herklotz, F., Johansen, K. M., Galeckas, A., Sky, T. N., and Svensson, B. G.
Subjects: *ZINC oxide, *HYDROGEN, *LITHIUM, *INFRARED absorption, *THERMAL stability
Abstract: The annealing behavior of the center in ZnO, which leads to a local vibrational mode at , has been studied. Infrared absorption measurements confirm the previous findings that the center dissociates already at temperatures higher than about 500C and an apparent stability up to 1250C is due to efficient retrapping of H by Li. Secondary ion mass spectrometry data indicate that Fe impurities prevent a reformation of after dissociation. The formation of Fe −Li complexes is proposed as a prevailing mechanism for this behavior. [ABSTRACT FROM AUTHOR]
Published: 2016
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Author: Lavrov, E. V., Herklotz, F., and Kutin, Y. S.
Subjects: *ZINC oxide, *NICKEL, *FOURIER transform infrared spectroscopy, *HAMILTONIAN systems, *JAHN-Teller effect
Abstract: The effect of uniaxial stress on the electronic 3T1(F) → 3T2(F) transitions of Ni2+ in ZnO at 4216, 4240, and 4247 cm-1 is investigated by means of Fourier transform IR absorption spectroscopy. A stress Hamiltonian is constructed which accounts for the behavior of these transitions under uniaxial stress. It is shown that the split pattern and polarization properties of these IR absorption lines are consistent with a dynamic Jahn-Teller effect in the 3T2(F) state of Ni. [ABSTRACT FROM AUTHOR]
Published: 2014
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Author: Herklotz, F., Lavrov, E.V., and Weber, J.
Subjects: *PHOTOLUMINESCENCE, *HYDROGENATION, *ZINC oxide, *EXCITON theory, *ION traps, *LATTICE theory
Abstract: Abstract: A photoluminescence study of hydrogenated ZnO bulk crystals is presented. Two excitonic recombination lines at 3362.8 and 3360.1meV are assigned to hydrogen shallow donors. Experimental evidence is presented that the corresponding donor to the line at 3362.8meV, previously labeled , originates from hydrogen trapped within the oxygen vacancy, . The line at 3360.1meV was found to be due to hydrogen located at the bond-centered lattice site, . The corresponding shallow donor has an ionization energy of 53meV. [Copyright &y& Elsevier]
Published: 2009
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Author: Herklotz, F., Lavrov, E.V., and Weber, J.
Subjects: *HYDROGEN, *POINT defects, *ZINC oxide, *ELECTRIC charge, *INFRARED absorption, *BAND gaps, *VIBRATION (Mechanics)
Abstract: Abstract: The hydrogen defect in ZnO that gives rise to a local vibrational mode at 3326cm−1 is investigated by means of IR absorption. Sub-band gap illumination results in the appearance of a new line at 3358cm−1 at the expense of the 3326cm−1 signal. The measurements identify both IR absorption signals as O–H stretch modes of the same defect in different charge states. The effect of the sub-band gap light strongly suggest that this defect has a deep level in the band gap. Additionally, results on the thermal stability of the 3326cm−1 feature are presented. [Copyright &y& Elsevier]
Published: 2012
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Author: Herklotz, F., Lavrov, E.V., and Weber, J.
Subjects: *ZINC oxide, *CRYSTAL defects, *DIFFUSION, *COPPER, *INFRARED spectra, *ABSORPTION spectra
Abstract: Abstract: An experimental study of Cu diffusion in bulk ZnO single crystals in the temperature range 1012– is presented. Concentration profiles of substitutional Cu were determined by IR absorption at . Our findings reveal that Cu in ZnO diffuses faster than previously reported [G. Müller, R. Helbig, J. Phys. Chem. Solids 32 (1971) 1971]. The discrepancy is tentatively explained by the formation of Cu complexes, which occurs at high Cu concentrations. [Copyright &y& Elsevier]
Published: 2009
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