Fundamental Optical Properties of ZnIn_2S_4 Single Crystals
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概要
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The fundamental optical properties, i.e. refractive index, fundamental absorption, and infrared lattice absorption, were investigated for ZnIn_2S_4 single crystals grown by the method of the chemical transport reactions. The refractive indexes, measured by means of interference method, are 2.20 and 2.50 at 1Oμ and 480mμ, respectively The coefficient of fundamental absorption up to 1×10^4 cm^<-1> in the range of 2.3〜2.9eV varies as an exponential function of pboton energy with the slope independent of temperature. This behavior may be explained to be caused by the influence of the dipolar field associated with defect. For the region of the order of 1O^4 cm^<-1> the direct allowed band-to-band transition was assumed to be responsible, the band gap calculated being 2.86 and 2.99eV at room temperature and 91°K, respectively. The peak of the absorption due to copper dopant is 2.54eV at 91°K. Infrared absorption for powder samples in the range of 20〜100μ shows two strong peaks at 33.O and 46.6μ, the former probably corresponding to Zn-S stretching while the latter to In (tetragonal)-S stretching.
- 社団法人日本物理学会の論文
- 1964-07-05
著者
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Shionoya Shigeo
The Institute For Solid State Physics The University Of Tokyo
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Ebina Atsuko
The Institute For Solid State Physics The University Of Tokyo:research Institute Of Electrical Commu
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