The optical and vibrational properties of the quaternary chalcopyrite semiconductor alloy AgxCu1-xGaS2

被引:24
作者
Choi, IH
Eom, SH
Yu, PY [1 ]
机构
[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
[2] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA
[3] Chung Ang Univ, Dept Phys, Seoul 156756, South Korea
关键词
D O I
10.1063/1.372419
中图分类号
O59 [应用物理学];
学科分类号
摘要
The absorption, emission and Raman spectra of the quaternary chalcopyrite alloys AgxCu1-xGaS2 have been measured as a function of the Ag concentration. We find strong and highly nonlinear dependence on the alloy concentration in the optical band gap (a large bowing parameter). On the other hand, most of the Raman peaks exhibit either small energy shifts or large broadening with alloying. We conclude that the effect of substitution of the Ag cations by Cu in AgGaS2 on its band structure cannot be predicted by the simple virtual crystal potential approximation as a result of the large difference in electronegativity and bond length between Ag and Cu. (C) 2000 American Institute of Physics. [S0021-8979(00)00308-X].
引用
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页码:3815 / 3822
页数:8
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