The optical and vibrational properties of the quaternary chalcopyrite semiconductor alloy Ag{sub x}Cu{sub 1-x}GaS{sub 2}
- Physics Department, Chung-Ang University, Seoul, Korea (Korea, Republic of)
- Department of Physics, University of California, Berkeley (United States)
The absorption, emission and Raman spectra of the quaternary chalcopyrite alloys Ag{sub x}Cu{sub 1-x}GaS{sub 2} 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 AgGaS{sub 2} 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.
- OSTI ID:
- 20215801
- Journal Information:
- Journal of Applied Physics, Vol. 87, Issue 8; Other Information: PBD: 15 Apr 2000; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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