Surface photovoltage spectroscopy analyses of Cd{sub 1-x}Zn{sub x}Te

Journal Article · Fri Feb 15 04:00:00 EST 2008 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.2885350· OSTI ID:21133952

Cavalcoli, D; Fraboni, B; Cavallini, A ^[1]

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1. CNISM and Physics Department, University of Bologna, Viale C Berti Pichat 6/II, 40127 Bologna (Italy)

Cd{sub 1-x}Zn{sub x}Te alloys have been studied by surface photovoltage spectroscopy (SPS) and energy dispersive spectroscopy (EDS). The analyses of surface photovoltage spectra have been perfomed at near and above band gap energies. Surface recombination effects on the surface photovoltage have been investigated. SPS analyses of Cd{sub 1-x}Zn{sub x}Te alloys with different surface conditions have shown that the surface recombination velocity significantly affects the SPS determination of the material band gap. Accounting for this and preparing the surfaces accordingly, SPS spectra of Cd{sub 1-x}Zn{sub x}Te samples have allowed an accurate determination of the optical band gap as a function of the Zn concentration, determined via EDS analyses. The local increases in the density of states associated with band structure features in Cd{sub 1-x}Zn{sub x}Te alloys have been investigated by SPS spectra in the above band gap energy range.

• OSTI ID: 21133952
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 4 Vol. 103; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CADMIUM ALLOYS
CHEMICAL ANALYSIS
INTERMETALLIC COMPOUNDS
RECOMBINATION
SPECTROSCOPY
TELLURIUM ALLOYS
TERNARY ALLOY SYSTEMS
ZINC ALLOYS