期刊
THIN SOLID FILMS
卷 517, 期 2, 页码 886-890出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2008.08.114
关键词
Optical properties; Cadmium oxide; Thallium doped CdO; Hydrogenated CdO; Mobility; Degenerate semiconductors; TCO; Hydrogenated Tl-doped CdO
Electrical and optical properties of Tl-doped CdO films (CdO:Tl) post-annealed in hydrogen atmosphere for different durations (15 min, 30 min, 45 min, and 60 min) were studied. The prepared films were characterised by the X-ray diffraction method and UV-VIS-NIR absorption-reflection spectroscopy. Experimental data indicate that annealing in H-2-atmosphere removes gradually with time the internal structural micro-stress that created as a consequence of Tl doping into CdO structure. The band gap of the hydrogenated Tl-doped CdO samples changes with H-2-annealing time following the changing in the free-electron concentration. These results were found to be in agreement with the available bandgap, widening and narrowing models. The optical properties were easily explained within the framework of Hamberg band-to-band transitions and classical Drude theory. It was found that the greatest enhancement of the electrical conduction parameters occurs by annealing of CdO:Tl films in H-2-atmosphere for 30-45 min when the conductivity increased by about 37% and the free-electron concentration increased by about 6%. The results of the present investigation are important for the transparent conducting oxide preparation technique. (C) 2008 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据