Raman Spectra of Ordered Vacancy Compounds in the Cu-In-Se System
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概要
- 論文の詳細を見る
Raman spectra of ordered vacancy compounds (OVC) of CuIn_2Se_<3.5> and CuIn_3Se_5 have been measured at room temperature. Similar nonpolarized Raman spectra are obtained for CuIn_2Se_<3.5> and CuIn_3Se_5. However, polarized Raman spectra are not available for CuIn_3Se_5 because of its unfavorable crystallinity. A signal at 154 cm^<-1> is assigned to be Γ_1 mode of D_<2d> symmetry, originating from the vibration of selenium atoms in the x - y (a-axes) plane. This signal corresponds to the signal at 178 cm^<-1> for CuInSe_2 of chalcopyrite-type in the Cu-In-Se system. The lowering of Γ_1 mode frequency for the defect structure is attributed to looser-bound selenium atoms on account of vacancies in the cation sites. Signals assigned as Γ_3 mode are unexpectedly observed in the geometries allowing the longitudinal optical (LO) modes of Γ_4 and Γ_5 symmetries. The respective mode peaks are found to be more dispersive in frequency for CuIn_2Se_<3.5> than for CuInSe_2.
- 社団法人応用物理学会の論文
- 1997-08-15
著者
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ENDO Saburo
Department of Electrical Engineering, Faculty of Engineering, Science University of Tokyo
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Endo Saburo
Department Of Electrical Engineering Faculty Of Engineering Science University Of Tokyo
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NOMURA Shigetaka
Department of Physics, College of Humanities & Sciences, Nihon University
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OUCHI Shin-ichi
Department of Electrical Engineering, Faculty of Engineering, Science University of Tokyo
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Ouchi Shin-ichi
Department Of Electrical Engineering Faculty Of Engineering Science University Of Tokyo:(present Add
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Nomura Shigetaka
Department Of Electrical Engineering Faculty Of Engineering Science University Of Tokyo
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