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Nanomaterials 2018, 8(8), 632; https://doi.org/10.3390/nano8080632

New Insights into the Role of Weak Electron–Phonon Coupling in Nanostructured ZnO Thin Films

Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan
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Received: 11 July 2018 / Revised: 9 August 2018 / Accepted: 15 August 2018 / Published: 20 August 2018
(This article belongs to the Special Issue Design and Development of Nanostructured Thin Films)
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Abstract

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. View Full-Text
Keywords: Raman scattering; quantum confinement; electron–phonon coupling; polar semiconductors; zinc oxide Raman scattering; quantum confinement; electron–phonon coupling; polar semiconductors; zinc oxide
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Gandhi, A.C.; Yeoh, W.-S.; Wu, M.-A.; Liao, C.-H.; Chiu, D.-Y.; Yeh, W.-L.; Huang, Y.-L. New Insights into the Role of Weak Electron–Phonon Coupling in Nanostructured ZnO Thin Films. Nanomaterials 2018, 8, 632.

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