| Title |
Effects of Post Heat Treatments on ZnO Thin-Films Grown on Zn-coated Teflon Substrates |
| Authors |
김익현(Ik Hyun Kim); 남기웅(Gi Woong Nam); 이철언(Cheol Eon Lee); 김동완(Dong Whan Kim); 최현광(Hyon Kwang Choi); 김양수(Yang Soo Kim); 김진수(Jin Soo Kim); 김종수(Jong Su Kim); 손정식(Jeong-sik Son); 임재영(Jae-young Leem) |
| DOI |
https://doi.org/10.3365/KJMM.2015.53.6.432 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
zinc oxide; teflon substrate; zn coating layer; spin coating; photoluminescence |
| Abstract |
ZnO thin films were first grown on Zn-coated Teflon substrates using a spin-coating method, with various post-heating temperatures. The structural and optical properties of the ZnO thin films were then investigated using field-effect scanning-electron microscopy, X-ray diffractometry, and photoluminescence (PL) spectroscopy. The surface morphology of these ZnO thin films exhibited dendritic structures. With increasing post-heating temperature, all samples preferentially exhibited preferential c-axis orientation and increased residual tensile stress. All of the films exhibited preferential c-axis orientation, and the residual tensile stress of those increased with increasing post-heating temperature. The near-band-edge emission (NBE) peaks were red-shifted after post-heating treatment at 400 ℃. The intensity of the deep-level emission (DLE) peaks gradually decreased with increasing post- heating temperature. Moreover, the narrowest ‘full width at half maximum’ (FWHM) and the highest intensity ratio of the NBE to the DLE for thin films, were observed after post-heating at 400 ℃. The ZnO thin films fabricated with the 400 ℃ post-heating process provided the highest crystallinity and optical properties.(Received March 04, 2014) |