Nano-scale medium-range order in semiconducting glassy chalcogenides

Autor:	T.F. Mazets, M.V. Baidakova, E. A. Smorgonskaya, N.N. Faleev
Rok vydání:	1995
Předmět:	Diffraction Materials science Relaxation (NMR) Mineralogy Condensed Matter Physics Electronic Optical and Magnetic Materials Nanoclusters Photoexcitation Absorption band Chemical physics Metastability Materials Chemistry Ceramics and Composites Nanoscopic scale Superstructure (condensed matter)
Zdroj:	Journal of Non-Crystalline Solids. :149-152
ISSN:	0022-3093
DOI:	10.1016/0022-3093(95)00436-x
Popis:	Comprehensive X-ray diffraction studies of bulk glassy g-(As 2 S 3 ) 0.95 In 0.05 , g-(As 2 S 3 ) 0.95 (GaSb) 0.05 and g-(As 2 S 3 ) 0.56 I 0.44 samples reveal a large-scale medium-range ordering with correlation lengths up to ∼ 50 A. 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-As 2 S 3 matrix. In this qualitative model, the observed additional optical absorption band, as well as the surprising phenomenon of stable optical anisotropy in g-As 2 S 3 :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-As 2 S 3 :I with a rather wide range of relaxation times.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e8bcbafc8ec628d0914a415f785141e7 https://doi.org/10.1016/0022-3093(95)00436-x Zobrazit plný text záznamu Full Text from ScienceDirect