RTU Research Information System
Latviešu English

Publikācija: Photoluminescence of CdZnTe Thick Films Obtained by Close-Spaced Vacuum Sublimation

Publication Type Scientific article indexed in SCOPUS or WOS database
Funding for basic activity Unknown
Defending: ,
Publication language English (en)
Title in original language Photoluminescence of CdZnTe Thick Films Obtained by Close-Spaced Vacuum Sublimation
Field of research 1. Natural sciences
Sub-field of research 1.3 Physical sciences
Authors V. Kosyak
Y. Znamenshchykov
Aurimas Čerškus
Līga Grase
Yu.P. Gnatenko
Artūrs Medvids
A. Opanasyuk
Gundars Mežinskis
Keywords II–VI crystals; Low-temperature photoluminescence; Semiconductor thick films; Residual impurity states; Point and extended defects; Optical quality
Abstract Polycrystalline Cd1−xZnxTe thick films with thicknesses of about 30 μm have been deposited on a Mo coated glass substrate by means of close-spaced vacuum sublimation technique. X-ray diffraction measurements have shown that the films obtained have only cubic zinc blende phase. The influence of Zn concentration on the photoluminescence (PL) spectra of Cd1−xZnxTe films was investigated. This let us determine the nature and energy structure of the intrinsic defects and residual impurities in the films. The presence of the most intense acceptor bound exciton A°X-line for x=0.10 and the lines of localized excitons (x=0.32−0.44) in PL spectra of Cd1−xZnxTe films indicates their fairly good optical quality as well as the p-type conductivity. There were also other intensive broad PL bands, caused by the recombination of donor–acceptor pairs involving complex acceptor centers, extended defects of dislocation type, and microstress in the films. It was also established a correlation between the broadening of exciton lines and the values of microstress in Cd1−xZnxTe thick films. Taking into account the energy position of exciton lines, the concentration dependence of the band gap for the Cd1−xZnxTe thick films is presented.
DOI: 10.1016/j.jlumin.2015.11.027
Hyperlink: http://www.sciencedirect.com/science/article/pii/S0022231315305081 
Reference Kosyak, V., Znamenshchykov, Y., Čerškus, A., Grase, L., Gnatenko, Y., Medvids, A., Opanasyuk, A., Mežinskis, G. Photoluminescence of CdZnTe Thick Films Obtained by Close-Spaced Vacuum Sublimation. Journal of Luminescence, 2016, Vol.171, pp.176-182. ISSN 0022-2313. Available from: doi:10.1016/j.jlumin.2015.11.027
Additional information Citation count:
ID 23302