New Insights into the Role of Weak Electron–Phonon Coupling in Nanostructured ZnO Thin Films
| Autor: | Dai-Yao Chiu, Wei-Li Yeh, Ashish Chhaganlal Gandhi, Ching-Hao Liao, Wei-Shan Yeoh, Ming-An Wu, Yue-Lin Huang |
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| Rok vydání: | 2018 |
| Předmět: |
Raman scattering
Diffraction Materials science Scanning electron microscope General Chemical Engineering 02 engineering and technology 010402 general chemistry 01 natural sciences Article quantum confinement lcsh:Chemistry symbols.namesake Sputtering General Materials Science Thin film business.industry zinc oxide polar semiconductors 021001 nanoscience & nanotechnology Grain size 0104 chemical sciences lcsh:QD1-999 Quantum dot electron–phonon coupling symbols Sapphire Optoelectronics 0210 nano-technology business |
| Zdroj: | Nanomaterials, Vol 8, Iss 8, p 632 (2018) Nanomaterials Volume 8 Issue 8 |
| ISSN: | 2079-4991 |
| DOI: | 10.3390/nano8080632 |
| Popis: | 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&ndash 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 Frö hlich 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. |
| Databáze: | OpenAIRE |
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