Quantum-size effects of PbS nanocrystallites in evaporated composite films |
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| Affiliation: | 1. Fraunhofer Institut für Angewandte Optik und Feinmechanik, Schillerstr. 1, D-07745 Jena, Germany;2. Sentronic GbR, Gostritzer Str. 61 - 63, D - 01217 Dresden, Germany;3. Institut für Festkörper- und Werkstofforschung, Helmholtzstr. 20, D - 01069 Dresden, Germany;4. Feinchemie GmbH. Sebnitz, Höhenweg 9, D - 01855 Sebnitz, Germany;1. Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea;2. School of Materials Science and Engineering, Changwon National University, 20 Changwondaehak-ro, Changwon, Gyeongnam 51140, Republic of Korea;1. Department of Physics, Shanghai Normal University, Shanghai 200234, PR China;2. School of Arts and Sciences, MCPHS University, Boston, MA 02115, USA;1. Department of Automation, Xiamen University, Xiamen 361005, Fujian, China;2. School of Information Technology, York University, Toronto M3J 1P3, Canada;3. Innovation Center for Cell Signaling Network, Xiamen University, Xiamen 361102, Fujian, China;4. Xiamen Research Institute of National Center of Healthcare Big Data, Xiamen 361005, Fujian, China;1. Department of Physics, Queen’s University, Kingston, ON, Canada K7L 3N6;2. Department of Physics, Royal Military College of Canada, Kingston, ON, Canada K7K 7B4;1. State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China;2. Collaborative Innovation Centre of Quantum Matter, Beijing 100084, China;3. Centre for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing 100084, China;4. Institute for Quantum Science and Engineering and Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China |
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| Abstract: | ![]()
Semiconductor nanocrystallites exhibit electronic, optical and photochemical properties greatly differing from those observed in the related bulk material due to quantum size effects. In view of future applications, nanoclusters based on sulphur compounds will find great potential as photocatalysts or nonlinear optical materials. The method of interrupted island growth was applied to form PbS nanocrystallites in a dielectric SiO2 host by a two source-evaporation technology. Depending on the deposition conditions, PbS nanocrystals can be formed with grain size down to about 1 nm, giving a significant increase in the optical band gap from 0.41 eV for the bulk material to about 5.2 eV. XPS, XRD and TEM investigations were performed to verify the formation of PbS nanocrystallites in the SiO2 host. These nanocrystallites show an intensive photoluminescence emission band at about 435 nm, with the intensity decreasing with increasing PbS concentration. |
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