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New Insights into the Role of Weak Electron–Phonon Coupling in Nanostructured ZnO Thin Films
High-quality crystalline nanostructured ZnO thin films were grown on sapphire substrates by reactive sputtering. As-grown and post-annealed films (in air) with various grain sizes (2 to 29 nm) were investigated by scanning electron microscopy, X-ray diffraction, and Raman scattering. The electron–ph...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6116313/ https://www.ncbi.nlm.nih.gov/pubmed/30127317 http://dx.doi.org/10.3390/nano8080632 |
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author | Gandhi, Ashish C. Yeoh, Wei-Shan Wu, Ming-An Liao, Ching-Hao Chiu, Dai-Yao Yeh, Wei-Li Huang, Yue-Lin |
author_facet | Gandhi, Ashish C. Yeoh, Wei-Shan Wu, Ming-An Liao, Ching-Hao Chiu, Dai-Yao Yeh, Wei-Li Huang, Yue-Lin |
author_sort | Gandhi, Ashish C. |
collection | PubMed |
description | High-quality crystalline nanostructured ZnO thin films were grown on sapphire substrates by reactive sputtering. As-grown and post-annealed films (in air) with various grain sizes (2 to 29 nm) were investigated by scanning electron microscopy, X-ray diffraction, and Raman scattering. The electron–phonon coupling (EPC) strength, deduced from the ratio of the second- to the first-order Raman scattering intensity, diminished by reducing the ZnO grain size, which mainly relates to the Fröhlich interactions. Our finding suggests that in the spatially quantum-confined system the low polar nature leads to weak EPC. The outcome of this study is important for the development of nanoscale high-performance optoelectronic devices. |
format | Online Article Text |
id | pubmed-6116313 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-61163132018-08-31 New Insights into the Role of Weak Electron–Phonon Coupling in Nanostructured ZnO Thin Films Gandhi, Ashish C. Yeoh, Wei-Shan Wu, Ming-An Liao, Ching-Hao Chiu, Dai-Yao Yeh, Wei-Li Huang, Yue-Lin Nanomaterials (Basel) Article High-quality crystalline nanostructured ZnO thin films were grown on sapphire substrates by reactive sputtering. As-grown and post-annealed films (in air) with various grain sizes (2 to 29 nm) were investigated by scanning electron microscopy, X-ray diffraction, and Raman scattering. The electron–phonon coupling (EPC) strength, deduced from the ratio of the second- to the first-order Raman scattering intensity, diminished by reducing the ZnO grain size, which mainly relates to the Fröhlich interactions. Our finding suggests that in the spatially quantum-confined system the low polar nature leads to weak EPC. The outcome of this study is important for the development of nanoscale high-performance optoelectronic devices. MDPI 2018-08-20 /pmc/articles/PMC6116313/ /pubmed/30127317 http://dx.doi.org/10.3390/nano8080632 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Gandhi, Ashish C. Yeoh, Wei-Shan Wu, Ming-An Liao, Ching-Hao Chiu, Dai-Yao Yeh, Wei-Li Huang, Yue-Lin New Insights into the Role of Weak Electron–Phonon Coupling in Nanostructured ZnO Thin Films |
title | New Insights into the Role of Weak Electron–Phonon Coupling in Nanostructured ZnO Thin Films |
title_full | New Insights into the Role of Weak Electron–Phonon Coupling in Nanostructured ZnO Thin Films |
title_fullStr | New Insights into the Role of Weak Electron–Phonon Coupling in Nanostructured ZnO Thin Films |
title_full_unstemmed | New Insights into the Role of Weak Electron–Phonon Coupling in Nanostructured ZnO Thin Films |
title_short | New Insights into the Role of Weak Electron–Phonon Coupling in Nanostructured ZnO Thin Films |
title_sort | new insights into the role of weak electron–phonon coupling in nanostructured zno thin films |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6116313/ https://www.ncbi.nlm.nih.gov/pubmed/30127317 http://dx.doi.org/10.3390/nano8080632 |
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