Study of the optical properties of amorphous As-Se-S thin films

被引：13

作者：

Aly, Kamal A. ^{[1
,2
]}

Hegazy, H. H. ^{[3
]}

Dahshan, A. ^{[3
,4
]}

Shaaban, Kh. S. ^{[5
]}

Saddeek, Y. ^{[2
]}

Alharbi, S. R. ^{[6
]}

Ali, Atif Mossad ^{[3
,7
]}

Amin, S. A. ^{[7
]}

机构：

[1] Univ Jeddah, Fac Sci & Arts Khulais, Dept Phys, Khulais, Saudi Arabia

[2] Al Azhar Univ, Assiut branch, Dept Phys, Fac Sci, Assiut 71524, Egypt

[3] King Khalid Univ, Dept Phys, Fac Sci, POB 9004, Abha, Saudi Arabia

[4] Port Said Univ, Dept Phys, Fac Sci, Port Said, Egypt

[5] Al Azhar Univ, Assiut branch, Dept Chem, Fac Sci, Assiut, Egypt

[6] Univ Jeddah, Dept Phys, Fac Sci, Jeddah, Saudi Arabia

[7] Assiut Univ, Dept Phys, Fac Sci, Assiut, Egypt

来源：

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING | 2018年 / 124卷 / 12期

关键词：

CHALCOGENIDE GLASSES; CONSTANTS; GE; THICKNESS; GAP;

D O I：

10.1007/s00339-018-2278-x

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This study investigates the effects of substitution of selenium by sulfur on the optical constants of amorphous (a-)As20Se80-xSx films (x=0, 4, 8, 12, 16, and 20at%), where the coordination number for both Se and S is the same. The absorption coefficient, , and the index of refraction, n, were derived using the transmission spectra in a wide range of wavelengths from 400 to 2500nm. This revealed that the index of refraction for the a-As20Se80-xSx system decreases with increase in sulfur content throughout the range under study. The effective coordination number of As has been determined based on the refractive index dispersion analysis. A decreasing in N-c from 4.022 to 3.752 with increase content of sulfur from 0 to 20at% has been recorded. In addition, the optical bandgap, E-g, of the a-As20Se80-xSx thin films increases with increase in S content which can be explicated in terms of the chemical bond approach.

引用

页数：8

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