OPTICAL-ABSORPTION EDGE AND URBACH RULE IN MIXED SINGLE-CRYSTALS OF (GAXIN1-X)2SE3 IN THE INDIUM RICH REGION

被引:45
作者
DESNICA, DI [1 ]
KRANJCEC, M [1 ]
CELUSTKA, B [1 ]
机构
[1] FAC MED ZAGREB, DEPT PHYS, Zagreb, YUGOSLAVIA
关键词
OPTICAL ABSORPTION; FUNDAMENTAL ABSORPTION EDGE; URBACH RULE; (GAXIN1-X)2SE3; TERNARY ALLOYS;
D O I
10.1016/0022-3697(91)90015-R
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The absorption processes at the absorption edge of the ternary system (Ga(x)In1-x)2Se3 in the In-rich region were investigated. For all concentrations the absorption coefficient exhibited exponential dependence on photon energy following Urbach's rule. The characteristic Urbach parameters were determined and their temperature and compositional dependence investigated. Analyzing the results along the lines of the general model which takes into account the possible role of several different types of disorder we concluded that the absorption processes in the absorption edge for our mixed solution of binary compounds are the results of the superposition of at least two different mechanisms, one related to the crystal phonons and the other resulting from structural and compositional disorder.
引用
收藏
页码:915 / 920
页数:6
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