期刊
MATERIALS RESEARCH BULLETIN
卷 43, 期 10, 页码 2742-2750出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2007.10.013
关键词
semiconductors; Raman spectroscopy; optical properties
资金
- Department of Science and Technology (DST)
- Ministry of Non-Conventional Energy Sources (NINES), Govt. of India
Synthesis and characterization of CuInS2 powder sample prepared by a simple and convenient solvothermal method is reported. The influence of the variation of Cu/In molar ratio from 0.69 to 1.25 on the particle morphology, crystal structure and optical properties of CuInS2 samples was studied. The X-ray diffraction studies indicated that the samples were polycrystalline in nature. SEM images of the samples revealed that the copper-rich products were uniform microspheres with smooth surfaces, whereas microspheres formed by network of interconnected flakes were obtained for indium-rich products. The optical band gaps (E-g) of the products decreased from 1.60 to 1.43 eV with variation of Cu/In molar ratio. The variation of the Urbach tail width with Cu/In molar ratio indicated that the density of the defects is much higher for the indium-rich CuInS2, which was clearly revealed from Raman measurements. (C) 2007 Elsevier Ltd. All rights reserved.
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