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- W2908785833 abstract "The thermal conductivities of c- and a-axis-oriented zinc oxide (ZnO) thin films with nominal thicknesses of 100, 200, and 300 nm are investigated. The c- and a-axis-oriented ZnO thin films were synthesized by radio frequency magnetron sputtering on the c- and r-plane sapphire substrates, respectively. The epitaxial relationship between the ZnO thin film and the c-plane sapphire substrate is ( 0001 ) [ 1 1 ¯ 00 ] || ( 0001 ) [ 11 2 ¯ 0 ], and that between the ZnO thin film and the r-plane sapphire substrate is ( 11 2 ¯ 0 ) [ 1 1 ¯ 00 ] || ( 01 1 ¯ 2 ) [ 11 2 ¯ 0 ]. The c-axis-oriented ZnO thin film has a columnar structure, whereas the a-axis-oriented ZnO thin film has a single domain-like structure and a significantly flat surface. The thermal conductivity of the c-axis-oriented ZnO thin film is in the range of 18–24 W m−1 K−1, whereas for the a-axis-oriented ZnO thin film, it is in the range of 24–29 W m−1 K−1. For the c-axis-oriented ZnO thin films, the phonon scattering on both the out-of-plane and in-plane grain boundaries affects the thermal conductivity. In contrast, the thermal conductivity of the a-axis-oriented ZnO thin films decreases with the decrease of the film thickness. The distribution of the normalized cumulative thermal conductivity of the a-axis-oriented ZnO thin films suggests that the heat transport carrier mostly consists of phonons with the mean free paths between 100 nm and 1 μm.The thermal conductivities of c- and a-axis-oriented zinc oxide (ZnO) thin films with nominal thicknesses of 100, 200, and 300 nm are investigated. The c- and a-axis-oriented ZnO thin films were synthesized by radio frequency magnetron sputtering on the c- and r-plane sapphire substrates, respectively. The epitaxial relationship between the ZnO thin film and the c-plane sapphire substrate is ( 0001 ) [ 1 1 ¯ 00 ] || ( 0001 ) [ 11 2 ¯ 0 ], and that between the ZnO thin film and the r-plane sapphire substrate is ( 11 2 ¯ 0 ) [ 1 1 ¯ 00 ] || ( 01 1 ¯ 2 ) [ 11 2 ¯ 0 ]. The c-axis-oriented ZnO thin film has a columnar structure, whereas the a-axis-oriented ZnO thin film has a single domain-like structure and a significantly flat surface. The thermal conductivity of the c-axis-oriented ZnO thin film is in the range of 18–24 W m−1 K−1, whereas for the a-axis-oriented ZnO thin film, it is in the range of 24–29 W m−1 K−1. For the c-axis-oriented ZnO thin films, the phonon scattering on bo..." @default.
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- W2908785833 date "2019-01-21" @default.
- W2908785833 modified "2023-10-16" @default.
- W2908785833 title "Thermal conductivity of hetero-epitaxial ZnO thin films on <i>c</i>- and <i>r</i>-plane sapphire substrates: Thickness and grain size effect" @default.
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- W2908785833 doi "https://doi.org/10.1063/1.5055266" @default.
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