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49 results on '"Oughaddou, Hamid"'

1. Direct observation of electronic band gap and hot carrier dynamics in GeAs semiconductor

Author

Zhang, Zailan, Zhang, Jiuxiang, Zhou, Gangqiang, Xu, Jiyuan, Zhang, Xiao, Oughaddou, Hamid, Qi, Weiyan, Papalazarou, Evangelos, Perfetti, Luca, Chen, Zhesheng, Bendounan, Azzedine, and Marsi, Marino

Subjects
Condensed Matter - Materials Science
Abstract

Germanium arsenide (GeAs) is a layered semiconductor with remarkably anisotropic physical, thermoelectric and optical properties, and a promising candidate for multifunctional devices based on in-plane polarization dependent response. Understanding the underlying mechanism of such devices requires the knowledge of GeAs electronic band structure and of the hot carrier dynamics in its conduction band, whose details are still unclear. In this work, we investigated the properties of occupied and photoexcited states of GeAs in energy-momentum space, by combining scanning tunneling spectroscopy (STS), angle-resolved photoemission spectroscopy (ARPES) and time-resolved ARPES. We found that, GeAs is an indirect gap semiconductor having an electronic gap of 0.8 eV, for which the conduction band minimum (CBM) is located at the Gamma point while the valence band maximum (VBM) is out of Gamma. A Stark broadening of the valence band is observed immediately after photoexcitation, which can be attributed to the effects of the electrical field at the surface induced by inhomogeneous screening. Moreover, the hot electrons relaxation time of 1.56 ps down to the CBM which is dominated from both inter-valley and intra-valley coupling. Besides their relevance for our understanding of GeAs, these findings present general interest for the design on high performance thermoelectric and optoelectronic devices based on 2D semiconductors.

Published
2024

2. Silicene nanoribbons on an insulating thin film

Author

Quertite, Khalid, Enriquez, Hanna, Trcera, Nicolas, Tong, Yongfeng, Bendounan, Azzedine, Mayne, Andrew J., Dujardin, Gérald, Lagarde, Pierre, kenz, Abdallah El, Benyoussef, Abdelilah, Dappe, Yannick J., Kara, Abdelkader, and Oughaddou, Hamid

Subjects
Condensed Matter - Materials Science
Abstract

Silicene, a new two-dimensional (2D) material has attracted intense research because of the ubiquitous use of silicon in modern technology. However, producing free-standing silicene has proved to be a huge challenge. Until now, silicene could be synthesized only on metal surfaces where it naturally forms strong interactions with the metal substrate that modify its electronic properties. Here, we report the first experimental evidence of silicene sheet on an insulating NaCl thin film. This work represents a major breakthrough; for the study of the intrinsic properties of silicene, and by extension to other 2D materials that have so far only been grown on metal surfaces.

Published
2020
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3. Phosphorus Pentamers: Floating Nanoflowers form a 2D Network

Author

Zhang, Wei, Enriquez, Hanna, Tong, Yongfeng, Mayne, Andrew J., Bendounan, Azzedine, Dappe, Yannick J., Kara, Abdelkader, Dujardin, Gérald, and Oughaddou, Hamid

Subjects
Condensed Matter - Materials Science
Abstract

We present an experimental investigation of a new polymorphic 2D single layer of phosphorus on Ag(111). The atomically-resolved scanning tunneling microscopy (STM) images show a new 2D material composed of freely-floating phosphorus pentamers organized into a 2D layer, where the pentamers are aligned in close-packed rows. The scanning tunneling spectroscopy (STS) measurements reveal a semiconducting character with a band gap of 1.20 eV. This work presents the formation at low temperature (LT) of a new polymorphic 2D phosphorus layer composed of a floating 2D pentamer structure. The smooth curved terrace edges and a lack of any clear crystallographic orientation with respect to the Ag(111) substrate at room temperature indicates a smooth potential energy surface that is reminiscent of a liquid-like growth phase. This is confirmed by density functional theory (DFT) calculations that find a small energy barrier of only 0.17 eV to surface diffusion of the pentamers (see Supplemental Material). The formation of extended, homogeneous domains is a key ingredient to opening a new avenue to integrate this new 2D material into electronic devices.

Published
2020

4. Tip-induced oxidation of silicene nano-ribbons

Author

Enriquez, Mohammed Rachid Tchalala Hanna, Bendounan, Azzedine, Mayne, Andrew J., Dujardin, Gérald, Kara, Abdelkader, Ali, Mustapha Ait, and Oughaddou, Hamid

Subjects
Condensed Matter - Materials Science
Abstract

We report on the oxidation of self-assembled silicene nanoribbons grown on the Ag(110) surface using Scanning Tunneling Microscopy and High-Resolution Photoemission Spectroscopy. The results show that silicene nanoribbons present a strong resistance towards oxidation using molecular oxygen. This can be overcome by increasing the electric field in the STM tunnel junction above a threshold of +2.6 V to induce oxygen dissociation and reaction. The higher reactivity of the silicene nanoribbons towards atomic oxygen is observed as expected. The HR-PES confirm these observations: Even at high exposures of molecular oxygen, the Si 2p core-level peaks corresponding to pristine silicene remain dominant, reflecting a very low reactivity to molecular oxygen. Complete oxidation is obtained following exposure to high doses of atomic oxygen; the Si 2p core level peak corresponding to pristine silicene disappears.

Published
2020

5. Epitaxial Synthesis of Blue Phosphorene

Author

Zhang, Wei, Enriquez, Hanna, Tong, Yongfeng, Bendounan, Azzedine, Kara, Abdelkader, Seitsonen, Ari P., Mayne, Andrew J., Dujardin, Gérald, and Oughaddou, Hamid

Subjects
Condensed Matter - Materials Science, 82D80
Abstract

Phosphorene is a new two-dimensional material composed of a single or few atomic layers of black phosphorus. Phosphorene has both an intrinsic tunable direct band gap and high carrier mobility values, which make it suitable for a large variety of optical and electronic devices. However, the synthesis of single-layer phosphorene is a major challenge. The standard procedure to obtain phosphorene is by exfoliation. More recently, the epitaxial growth of single-layer phosphorene on Au(111) has been investigated by molecular beam epitaxy and the obtained structure has been described as a blue-phosphorene sheet. In the present study, large areas of high-quality monolayer phosphorene, with a band gap value at least equal to 0.8 eV, have been synthesized on Au(111). Our experimental investigations, coupled with DFT calculations, give evidence of two distinct phases of blue phosphorene on Au(111), instead of one as previously reported, and their atomic structures have been determined., Comment: This paper reports on the epitaxial synthesis of blue phosphorene

Published
2018
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6. Direct observation of electronic bandgap and hot carrier dynamics in GeAs semiconductor.

Author

Zhang, Zailan, Zhang, Jiuxiang, Zhou, Gangqiang, Xu, Jiyuan, Michel, Ian-Evan, Dappe, Yannick, Zhang, Xiao, Oughaddou, Hamid, Qi, Weiyan, Papalazarou, Evangelos, Perfetti, Luca, Chen, Zhesheng, Bendounan, Azzedine, and Marsi, Marino

Abstract

Germanium arsenide (GeAs) is a layered semiconductor with remarkably anisotropic thermoelectric and optical properties and a promising candidate for multifunctional devices based on in-plane polarization dependent response. Understanding the underlying mechanism of such devices requires knowledge of GeAs electronic band structure and of the hot carrier dynamics in its conduction band, whose details are still unclear. In this work, we investigate the properties of occupied and photoexcited states of GeAs, by combining scanning tunneling spectroscopy, angle-resolved photoemission spectroscopy (ARPES), and time-resolved ARPES. We find that GeAs is an ∼0.8 eV indirect gap semiconductor, for which the conduction band minimum (CBM) is located at the Γ ¯ point while the valence band maximum is out of Γ ¯ . A Stark broadening of the valence band is observed immediately after photoexcitation, which can be attributed to the effects of the electrical field at the surface induced by inhomogeneous screening. Moreover, the hot electron relaxation time of 1.56 ps is down to the CBM, which is dominated by electron–phonon coupling. Besides their relevance for our understanding of GeAs, these findings present general interest for the design of high performance thermoelectric and optoelectronic devices based on 2D semiconductors. [ABSTRACT FROM AUTHOR]

Published
2024
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14. Silicene on Ag(111) and Au(110) Surfaces

Author

Oughaddou, Hamid, Enriquez, Hanna, Tchalala, Mohammed Rachid, Bendounan, Azzedine, Mayne, Andrew J., Sirroti, Fausto, Dujardin, Gérald, Hull, Robert, Series editor, Jagadish, Chennupati, Series editor, Osgood, Richard M., Series editor, Parisi, Jürgen, Series editor, Seong, Tae-Yeon, Series editor, Uchida, Shin-ichi, Series editor, Wang, Zhiming M., Series editor, Kawazoe, Yoshiyuki, Series editor, Spencer, Michelle J.S., editor, and Morishita, Tetsuya, editor

Published
2016
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16. First steps of silicene growth on an insulating thin-film: effect of the substrate temperature

Author

Quertite, Khalid, Enriquez, Hanna, Trcera, Nicolas, Lagarde, Pierre, Bendounan, Azzedine, Mayne, Andrew J., Dujardin, Gérald, El Kenz, Abdallah, Benyoussef, Abdelilah, Kara, Abdelkader, Oughaddou, Hamid, Institut des Matériaux, de Microélectronique et des Nanosciences de Provence (IM2NP), and Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], Condensed Matter Physics, Instrumentation, Electronic, Optical and Magnetic Materials
Abstract

International audience; Silicene is a two-dimensional (2D) material with very promising electronic properties for applications in silicon modern technology. However, the first experimental synthesis of silicene on metallic surfaces shows strong interactions between the silicene and its substrate, which can alter its electronic properties. Here, we report on the first steps of silicene growth on an insulating surface (NaCl) using scanning tunneling microscopy (STM), low energy electron diffraction (LEED), Auger electron spectroscopy (AES), and angle-resolved photoemission spectroscopy (ARPES). We demonstrate the importance of temperature annealing in the growth of silicene on NaCl. Indeed, after deposition of silicon on the NaCl/Ag(110) surface, we observe the following stages: (i) at room temperature, the silicon atoms accumulate on top of the NaCl layer without any given order. (ii) At 60 °C, silicon dimers start to grow on the NaCl. (iii) At 140 °C, these dimers form a 2D silicon chains on the surface. (iv) After a post-annealing at 200 °C, evident 2D silicon nanoribbons with a honeycomb-like structure were observed. Our results of the first silicene growth stages on an insulating surface are a necessary step for exploring its growth mechanism further.

Published
2023

18. Dirac Fermions in Blue Phosphorene Monolayer

Author

Kaddar, Youness, primary, Zhang, Wei, additional, Enriquez, Hanna, additional, Dappe, Yannick J., additional, Bendounan, Azzedine, additional, Dujardin, Gérald, additional, Mounkachi, Omar, additional, El kenz, Abdallah, additional, Benyoussef, Abdelilah, additional, Kara, Abdelkader, additional, and Oughaddou, Hamid, additional

Published
2023
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20. Silicene, a promising new 2D material

Author

Oughaddou, Hamid, Enriquez, Hanna, Tchalala, Mohammed Rachid, Yildirim, Handan, Mayne, Andrew J., Bendounan, Azzedine, Dujardin, Gérald, Ait Ali, Mustapha, and Kara, Abdelkader

Published
2015
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21. Structural properties of Bi/Au(110).

Author

Neziri, Egzona, Zhang, Wei, Smogunov, Alexander, Mayne, Andrew J, Kara, Abdelkader, Dappe, Yannick J, and Oughaddou, Hamid

Subjects
SCANNING tunneling microscopy, DENSITY functional theory, OPTOELECTRONIC devices, OPTOELECTRONICS, THIN films, ELECTRONIC equipment, ELECTRON diffraction
Abstract

Atomically thin bismuth films (2D Bi) are becoming a promising research area due to their unique properties and their wide variety of applications in spintronics, electronic and optoelectronic devices. We report on the structural properties of Bi on Au(110), explored by low-energy electron diffraction (LEED), scanning tunneling microscopy (STM) and density functional theory (DFT) calculations. At a Bi coverage lower than one monolayer (1 ML) various reconstructions are observed, we focus on Bi/Au(110)-c(2 × 2) reconstruction (at 0.5 ML) and Bi/Au(110)-(3 × 3) structure (at 0.66 ML). We propose models for both structures based on STM measurements and further confirm by DFT calculations. [ABSTRACT FROM AUTHOR]

Published
2023
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22. Silicene on Ag(111) and Au(110) Surfaces

Author

Oughaddou, Hamid, primary, Enriquez, Hanna, additional, Tchalala, Mohammed Rachid, additional, Bendounan, Azzedine, additional, Mayne, Andrew J., additional, Sirroti, Fausto, additional, and Dujardin, Gérald, additional

Published
2016
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23. Electron beam analysis induces Cl vacancy defects in a NaCl thin film

Author

Quertite, Khalid, primary, Enriquez, Hanna, additional, Trcera, Nicolas, additional, Bendounan, Azzedine, additional, Mayne, Andrew J, additional, Dujardin, Gérald, additional, El kenz, Abdallah, additional, Benyoussef, Abdelilah, additional, Dappe, Yannick J, additional, Kara, Abdelkader, additional, and Oughaddou, Hamid, additional

Published
2021
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25. Silicene Nanoribbons on an Insulating Thin Film

Author

Quertite, Khalid, primary, Enriquez, Hanna, additional, Trcera, Nicolas, additional, Tong, Yongfeng, additional, Bendounan, Azzedine, additional, Mayne, Andrew J., additional, Dujardin, Gérald, additional, Lagarde, Pierre, additional, El kenz, Abdallah, additional, Benyoussef, Abdelilah, additional, Dappe, Yannick J., additional, Kara, Abdelkader, additional, and Oughaddou, Hamid, additional

Published
2020
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26. Efficient production of few-layer black phosphorus by liquid-phase exfoliation

Author

Tiouitchi, Ghassane, primary, Ali, Mustapha Ait, additional, Benyoussef, Abdelilah, additional, Hamedoun, Mohammed, additional, Lachgar, Abdessadek, additional, Kara, Abdelkader, additional, Ennaoui, Ahmed, additional, Mahmoud, Abdelfattah, additional, Boschini, Frederic, additional, Oughaddou, Hamid, additional, El Moutaouakil, Amine, additional, El Kenz, Abdellah, additional, and Mounkachi, Omar, additional

Published
2020
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27. Blue phosphorene reactivity on the Au(111) surface

Author

Zhang, Wei, primary, Enriquez, Hanna, additional, Zhang, Xuan, additional, Mayne, Andrew J, additional, Bendounan, Azzedine, additional, Dappe, Yannick J, additional, Kara, Abdelkader, additional, Dujardin, Gérald, additional, and Oughaddou, Hamid, additional

Published
2020
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29. Evidence of new 2D material: Cu2Te

Author

Tong, Yongfeng, primary, Bouaziz, Meryem, additional, Zhang, Wei, additional, Obeid, Baydaa, additional, Loncle, Antoine, additional, Oughaddou, Hamid, additional, Enriquez, Hanna, additional, Chaouchi, Karine, additional, Esaulov, Vladimir, additional, Chen, Zhesheng, additional, Xiong, Heqi, additional, Cheng, Yingchun, additional, and Bendounan, Azzedine, additional

Published
2020
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31. Tip-induced oxidation of silicene nano-ribbons

Author

Tchalala, Mohamed Rachid, primary, Enriquez, Hanna, additional, Bendounan, Azzedine, additional, Mayne, Andrew J., additional, Dujardin, Gérald, additional, Kara, Abdelkader, additional, Ali, Mustapha Ait, additional, and Oughaddou, Hamid, additional

Published
2020
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35. Silicene Nanoribbons on an Insulating Thin Film.

Author

Quertite, Khalid, Enriquez, Hanna, Trcera, Nicolas, Tong, Yongfeng, Bendounan, Azzedine, Mayne, Andrew J., Dujardin, Gérald, Lagarde, Pierre, El kenz, Abdallah, Benyoussef, Abdelilah, Dappe, Yannick J., Kara, Abdelkader, and Oughaddou, Hamid

Subjects
THIN films, NANORIBBONS, METALLIC surfaces, SCANNING tunneling microscopy, PHOTOELECTRON spectroscopy
Abstract

Silicene, a new 2D material has attracted intense research because of the ubiquitous use of silicon in modern technology. However, producing free‐standing silicene has proved to be a huge challenge. Until now, silicene could be synthesized only on metal surfaces where it naturally forms strong interactions with the metal substrate that modify its electronic properties. Here, the authors report the first experimental evidence of silicene nanoribbons on an insulating NaCl thin film. This work represents a major breakthrough, for the study of the intrinsic properties of silicene, and by extension to other 2D materials that have so far only been grown on metal surfaces. [ABSTRACT FROM AUTHOR]

Published
2021
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38. Evidence of new 2D material: Cu2Te.

Author

Tong, Yongfeng, Bouaziz, Meryem, Zhang, Wei, Obeid, Baydaa, Loncle, Antoine, Oughaddou, Hamid, Enriquez, Hanna, Chaouchi, Karine, Esaulov, Vladimir, Chen, Zhesheng, Xiong, Heqi, Cheng, Yingchun, and Bendounan, Azzedine

Published
2020
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39. Epitaxial Synthesis of Blue Phosphorene

Author

Zhang, Wei, primary, Enriquez, Hanna, additional, Tong, Yongfeng, additional, Bendounan, Azzedine, additional, Kara, Abdelkader, additional, Seitsonen, Ari P., additional, Mayne, Andrew J., additional, Dujardin, Gérald, additional, and Oughaddou, Hamid, additional

Published
2018
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42. Atomic Structure of Submonolayer NaCl Grown on Ag(110) Surface

Author

Quertite, Khalid, primary, Lasri, Karima, additional, Enriquez, Hanna, additional, Mayne, Andrew J., additional, Bendounan, Azzedine, additional, Dujardin, Gérald, additional, Trcera, Nicolas, additional, Malone, Walter, additional, El Kenz, Abdallah, additional, Benyoussef, Abdelilah, additional, Kara, Abdelkader, additional, and Oughaddou, Hamid, additional

Published
2017
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46. Atomic Structure of Submonolayer NaCl Grown on Ag(110) Surface

Author

Quertite, Khalid, Lasri, Karima, Enriquez, Hanna, Mayne, Andrew J., Bendounan, Azzedine, Dujardin, Gérald, Trcera, Nicolas, Malone, Walter, El Kenz, Abdallah, Benyoussef, Abdelilah, Kara, Abdelkader, and Oughaddou, Hamid

Abstract

We report results on the growth of an NaCl film on Ag(110) under ultrahigh vacuum conditions. At room temperature, low-energy electron diffraction and scanning tunneling microscopy show that the NaCl film forms a (4×1) superstructure. At RT, the film consists of small-sized islands that coalesce into larger islands at 410 K. These large islands preserve the (4×1) superstructure and cover the entire surface. The apparent heights obtained from the STM images show that the initial thickness of the NaCl islands is one atomic layer, and they present a very small height corrugation. The density functional theory calculations, with and without the inclusion of van der Waals effects, confirm the coexistence of two domains in agreement with the observed structure.

Published
2024
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47. Journal of Physics. Conference Series

Author

Rahayu, Yuni Sri, Ekawati, Rooselyna, Nandiyanto, Asep Bayu Dani, Lukito, Agung, Wibawa, Setya Chendra, Purnomo, Yoppy Wahyu, Roza, Liszulfa, Aziz, Tian Abdul, Perbowo, Krisna Satria, Ulfah, Syafika, Escobar, Carlos Ruiz, Noordmans, Jacob, Lehnert, Ralf, Potting, Robertus, Meshkov, Sydney, Faryad, Muhammad, Sunaryo, Geni Rina, Purba, Julwan Hendry, Olivieri, Giacomo, Rajo-Iglesias, Eva, Gargano, Angela, Coraggio, Luigi, Itaco, Nunzio, Chruściel, Piotr T., Grant, James, Kunzinger, Michael, Minguzzi, Ettore, Bylander, Jonas, Löfwander, Tomas, Misiorny, Maciej, Motlan, Motlan, Restuati, Martina, Rajagukguk, Juniastel, Gröbner, Julian, Costa-Felix, Rodrigo P. B., Jiaotong, Yong Yue Xi'an, Tahir, Dahlang, Benova, E., Atanasova, M., Khaerudini, Deni S., Febriani, Febty, Oemry, Ferensa, Sugihartono, Iwan, Setiawan, Riza, Syuhada, Syuhada, Widayatno, Wahyu Bambang, Sugiarti, Eni, Ma, Yufei, Isnaeni, Isnaeni, Izzuddin, Hubby, Susila, I Putu, Sudiro, Toto, Herbani, Yuliati, Tai, Yan, Sanden, M.C.M. van de, Suris, R. A., Vorobjev, L. E., Firsov, D. A., Shalygin, V. A., Raikher, Yuriy, Balasoiu, Maria, Rogachev, Andrey, Bunoiu, Madalin, Jatmiko, Budi, Madlazim, Madlazim, Munasir, Munasir, Supardi, Imam, Deta, Utama Alan, Govindarajan, A., Siva, E. P., Suja, K., Jimenez, Javier, Flórez, Fernando Durán, Niño, Ely Dannier V., Atta Makki, Sameer, Abdul Latef, Firas Abdul Hameed, Tawfig, Luma Naji Mohammed, Al-Radi Al-Bakri, Nahla Abdul, Shakir, Raied Mustafa, Junjunan, Soleh Fajar, Prayogi, Afrido, Windya, Sridana, Dafik, Dafik, Surzhikov, Sergey T., Vaz da Costa, Bismarck, Martins, Paulo Henrique, Mol, Lucas Alvares, Pereira, Luiz Felipe C., Plascak, João Antonio, Mandaglio, Giuseppe, Trifirò, Antonio, Trimarchi, Marina, Indriyanti, Nurma Yunita, Ramli, Murni, Karyanto, Puguh, Pramesti, Getut, Warsito, Budi, Putro, Sapto Purnomo, Khumaeni, Ali, Kettani, Houssain, Sivakumar, R., Song, Iickho, Hernandez, Hector, Chacón, Guillermo, Sabido, Miguel, Raj, Ewa, Znajdek, Katarzyna, Hoang, Trinh Xuan, Tuan, Hoang Anh, Tuoc, Vu Ngoc, Taniguchi, Shigeru, Arima, Takashi, Ohzeki, Masayuki, Teppei, Ikeya, Kuwatani, Tatsu, Nakanishi-Ohno, Yoshinori, Miyama, Masamichi J., Obuchi, Tomoyuki, Averkiev, Nikita S., Poniaev, Sergey A., Sokolovskii, Grigorii S., Han, Jong, Kim, Ki-Seok, Correa, Rafael, Roa, Luis, Soto, Leopoldo, Navarro, Ignacio Herrera, Kaczmarczyk, Stefan, Zhao, Yichuan, Maeda, Atsutaka, Yoshida, Yoshiyuki, Hidaka, Mutsuo, Kuwabara, Toshihiko, Hama, Takayuki, Kuroda, Mitsutoshi, Takahashi, Susumu, Yamanaka, Akinori, Koscielniak, Shane, Khalimullovich, Salakhov Myakzyum, Vladimirovich, Samartsev Vitalii, Khamitovich, Gainutdinov Renat, Tseng, Juinling, Kotenko, Igor, Asnafi, Nader, Sokołowska, Dagmara, Acosta, Luis, Amador-Valenzuela, Paulina, Velazquez, Victor, Spindloe, Christopher, Risdiana, Risdiana, Furukawa, Yukio, Sulaiman, Shukri, Rusydi, Andrivo, Alatas, Husin, Oughaddou, Hamid, Kara, Abdelkader, Bendounan, Azzedine, Lasri, Karima, Mayne, Andrew, Kaddouri, Abedlilah, Rochdi, Nabil, El Boujlaidi, Abdelaziz, Lemaire, Jean-Louis, Amine, Khalil, Tétard, Laurène, Saadoune, Ismael, Jafri, Zubir Mat, Mahmud, Shahrom, Omar, Ahmad Fairuz, Arshad, Suhana, Gorlatch, Sergei, Mladenov, Georgi, Mufti, Nandang, Ivanov, V. A., Grishina, I. A., Voronova, E. V., Subiantoro, Agung Wijaya, Suyanto, Slamet, Butar Butar, Ferry, Borman, Vladimir D., Zank, G. P., Muskulus, Michael, Bottasso, Carlo L., Tande, John Olav Giæver, Kvamsdal, Trond, Fiangga, Shofan, Jakfar, M., Tomasini, Enrico Primo, Li, Wei, Sumiyoshi, Abe, Wang, Alexandre, Morales, Jimmy Alexander, Reyes, Ángel Manuel Meléndez, Gutiérrez, Jorge Andrés Calderón, Palma, Ricardo A. Torres, Ramdani, Rahmat, Kurniawati, Frida, Chen, Chuei Yee, Lee, Lai Soon, Kilicman, Adem, Ismail, Fudziah, Midi, Habshah, Gafurjan, Ibragimov, Husain, Sharifah Kartini Said, Ibrahim, Siti Nur Iqmal, Romanenko, Vladislav, Bogdanova, Ekaterina, Smirnov, Anton, Balakin, Boris, Simon, Martin, Kolbinger, Bernadette, Widmann, Eberhard, Karshenboim, Savely, Sivasankaran, S., Eswaramoorthi, S., Sudira, Putu, Djatmiko, Istanto Wahyu, Asnawi, Rustam, Suprapto, Nadi, Herawan, T., Vlachos, Dimitrios S., George, Fr. Augustine, Pandian, A. Sevuga, Vinothina, V., Donald, A. Cecil, Laosiritaworn, Y., Pattanaporkratana, A., and Thountom, S.

Published
2018

48. Synthesis and properties of phosphorus nanostructures on Au(110).

Author

Zhang X, El Kari H, Enriquez H, Bendounan A, Kara A, Dappe YJ, and Oughaddou H

Abstract

Phosphorene, a semiconducting two-dimensional material, has recently attracted huge interest due to its potential applications in opto-electronics. The first attempts to synthesize phosphorene were based mainly on mechanical and chemical exfoliations. A few years later, different groups reported the synthesis of phosphorene using the molecular beam epitaxy process, which opened the way for research on physical properties. In this article, we report phosphorus growth on an Au(110) substrate via molecular beam epitaxy. The atomically resolved scanning tunneling microscopy images exhibit a self-assembled phosphorus-dimer structure, which is converted into phosphorus chains when increasing the phosphorus coverage. The chemical composition of the obtained structures is determined via Auger electron and X-ray photoelectron spectroscopies. Density functional theory calculations support the experimental findings.

Published
2024
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49. Phase transition and thermal stability of epitaxial PtSe 2 nanolayer on Pt(111).

Author

Tong Y, Bouaziz M, Oughaddou H, Enriquez H, Chaouchi K, Nicolas F, Kubsky S, Esaulov V, and Bendounan A

Abstract

This work relates to direct synthesis of the two-dimensional (2D) transition metal dichalchogenide (TMD) PtSe 2 using an original method based on chemical deposition during immersion of a Pt(111) surface into aqueous Na 2 Se solution. Annealing of the sample induces significant modifications in the structural and electronic properties of the resulting PtSe 2 film. We report systematic investigations of temperature dependent phase transitions by combining synchrotron based high-resolution X-ray photoemission (XPS), low temperature scanning tunnelling microscopy (LT-STM) and low energy electron diffraction (LEED). From the STM images, a phase transition from TMD 2H-PtSe 2 to Pt 2 Se alloy monolayer structure is observed, in agreement with the LEED patterns showing a transition from (4 × 4) to (√3 × √3)R30° and then to a (2 × 2) superstructure. This progressive evolution of the surface reconstruction has been monitored by XPS through systematic de-convolution of the Pt4f and Se3d core level peaks at different temperatures. The present work provides an alternative method for the large scale fabrication of 2D transition metal dichalchogenide films., Competing Interests: The authors declare no conflicts of interest., (This journal is © The Royal Society of Chemistry.)

Published
2020
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