Size regulation by bandgap-controlled etching: Application to germanium nanoparticles |
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| Authors: | Seiichi Sato Takatoshi Ikeda Kengo Hamada Keisaku Kimura |
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| Institution: | 1. Peter the Great St.Petersburg Polytechnic University, Polytechnicheskaya 29, St.Petersburg 195251, Russia;2. Max Planck Institute of Microstructure Physics, Weinberg 2, Halle (Saale) 06120, Germany;3. Institute for Physics of Microstructures RAS, GSP-105, Nizhny Novgorod 603950, Russia;1. Karlsruher Institut für Technologie (KIT), DFG-Center für Funktionelle Nanostrukturen (CFN), Wolfgang-Gaede-Straße 1a, 76131 Karlsruhe, Germany;2. Paul Scherrer Institut, Laboratory for Micro- and Nanotechnology, 5232 Villigen PSI, Switzerland;3. Technische Universität Clausthal, Institut für Energieforschung und physikalische Technologien, Am Stollen 19B, 38640 Goslar, Germany;1. LRPCSI, Faculté des Sciences, Université 20 août 1955-Skikda, BP 26, Route d’El-Hadaïek, 21000 Skikda, Algeria;2. CIMAP (CEA-CNRS-ENSICAEN-Université de Caen Basse Normandie), BP 5133, 14070 Caen Cedex 5, France;3. InESS, CNRS, Université de Strasbourg, 23 rue du Loess, 67037 Strasbourg Cedex 2, France;4. CRND, BP 43, Sebbala, Draria, Algiers, Algeria;5. GSI, Helmholtz Zentrum für Schwerionenforschung, Planckstrasse 1, 64291 Darmstadt, Germany;6. Technische Universität Darmstadt, Petersenstraβe 23, 64287 Darmstadt, Germany;1. School of Physics, State Key Laboratory of Crystal Materials and Key Laboratory of Particle Physics and Particle Irradiation (MOE), Shandong University, Jinan 250100, PR China;2. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China;1. Department of Physics, M.S. Ramaiah Institute of Technology, Bangalore 560 054, India;2. Department of Chemistry, M.S. Ramaiah Institute of Technology, Bangalore 560 054, India;3. Department of Physics, Bangalore University, Bangalore 560 056, India;4. Centre for Advanced Materials Research, Tumkur University, Tumkur 572 103, India;5. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India;6. National Aerospace Laboratories (CSIR), Bangalore 560017, India |
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| Abstract: | A germanium (Ge) nanoparticle surface was etched in an aqueous solution under monochromatic light irradiation in the infrared-to-ultraviolet region. Since the bandgap widened up to the photon energy of the irradiating light, the average size of the nanoparticles was controlled and the size distribution narrowed. The quantum size effect explained the correlation between the resulting bandgap energy and the final size. The etched nanoparticles showed blue-green or red-infrared photoluminescence (PL) after the surfaces were terminated with organic molecules or hydrogen atoms. The PL peak energy was independent of size, indicating PL was due to radiative recombination via localized states at the Ge core surface. |
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