NANO-SCALE MEDIUM-RANGE ORDER IN SEMICONDUCTING GLASSY CHALCOGENIDES

被引:12
作者
BAIDAKOVA, MV [1 ]
FALEEV, NN [1 ]
MAZETS, TF [1 ]
SMORGONSKAYA, EA [1 ]
机构
[1] RUSSIAN ACAD SCI,AF IOFFE PHYS TECH INST,ST PETERSBURG 196140,RUSSIA
关键词
D O I
10.1016/0022-3093(95)00436-X
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Comprehensive X-ray diffraction studies of bulk glassy g-(As2S3)(0.95)In-0.05, g-(As2S3)(0.95)(GaSb)(0.05), and g-(As2S3)(0.56)I-0.44 samples reveal a large-scale medium-range ordering with correlation lengths up to similar to 50 Angstrom. The In- or Ga-doped glasses are considered non-homogeneous media containing a discrete hierarchy of metal enriched nanoclusters embedded in a metal-depleted g-As2S3 matrix. In this qualitative model, the observed additional optical absorption band, as well as the surprising phenomenon of stable optical anisotropy in g-As2S3:In, are explained. Large amounts of I atoms produce a more flexible medium-range order superstructure which may be easily rearranged by photoexcitation. This is the reason for the strong photoinduced metastable optical anisotropy in g-As2S3:I with a rather wide range of relaxation times.
引用
收藏
页码:149 / 152
页数:4
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