Photoconductivity of Pure Cadmium Sulfide Single Crystal near the Band Edge

概要

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Several peaks of the photoconductivity near the band edge of the cadmium sulfide single crystals are studied. The peaks are due to the exciton and the shallow donors caused by the native defects. The correlation between the peaks and the defects due to the deviation from the stoichiometry of the crystals is investigated. At 300°K it is confirmed that P_1(507.5mμ), P_〓(517 mμ) and P_5(532 mμ) appear in the crystal containing sulfur vacancies and that P_2(513.5 mμ) and P_4(522.5 mμ) are remarkable in the crystal containing cadmium interstitials. The peaks of the exciton photoconductivity, i.e., A, B and C, were observed at 501.5 mμ, 498 mμ and 485.5 mμ at 300°K, respectively. The temperature shift of the band edge is estimated to be 3.00×10^<-4>eV/°K from the data of the exciton A, B and C and P_1. From the results, the possible electronic transitions are discussed.
社団法人日本物理学会の論文
1967-03-05