Composition-induced structural modifications in the quaternary CuIn1-xGaxSe2 thin films:bond properties versus Ga content
Xu Chuan-Ming(徐传明)a)†, Sun Yun(孙云)a), Li Feng-Yan(李凤岩)a), Zhang Li(张力)a), Xue Yu-Ming(薛玉明)a), He Qing(何青)a), and Liu Hong-Tu(刘洪图)b)
a Institute of Photoelectronics, Nankai University, Tianjin 300071, China; b Department of Physics, University of Science and Technology of China, Hefei 230026, China
Abstract In this paper the dependence of structural properties of the quaternary CuIn1-xGaxSe2 films with tetragonal structure on the Ga content has been systematically investigated by Raman scattering and x-ray diffraction spectra. The shift of the dominant A1 mode, unlike the lattice constants, does not follow the linear Vegard law with increasing Ga content x, whereas exhibits approximately polynomial change from 174 cm-1 for CuInSe2 to 185cm-1 for CuGaSe2. Such behaviour should be indicative of presence of the asymmetric distribution of Ga and In on a microscopic scale in the films, due to Ga addition. The changes in the tetragonal distortion $\eta$ lead to a significant variation in the anion displacement parameter $U$, which should be responsible for the evolution of bond parameters and resultant Raman bands with $x$.
Received: 23 January 2006
Revised: 10 July 2006
Accepted manuscript online:
Fund: Project supported by China Postdoctoral Science Foundation (Grant No 2005037539), and the National High-Tech Research and Development Programm of China (Grant No 2004AA513020).
Cite this article:
Xu Chuan-Ming(徐传明), Sun Yun(孙云), Li Feng-Yan(李凤岩), Zhang Li(张力), Xue Yu-Ming(薛玉明), He Qing(何青), and Liu Hong-Tu(刘洪图) Composition-induced structural modifications in the quaternary CuIn1-xGaxSe2 thin films:bond properties versus Ga content 2007 Chinese Physics 16 788
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