Cd-rich and Te-rich low-temperature photoluminescence in cadmium telluride

Low-temperature photoluminescence emission spectra were measured in cadmium telluride (CdTe) samples in which composition was varied to promote either Cd or Te-rich stoichiometry. The ability to monitor stoichiometry is important, since it has been shown to impact carrier recombination. Te-rich samp...

Full description

Saved in:
Bibliographic Details
Published in:Applied physics letters 2014-03, Vol.104 (9)
Main Authors: Albin, D. S., Kuciauskas, D., Ma, J., Metzger, W. K., Burst, J. M., Moutinho, H. R., Dippo, P. C.
Format: Article
Language:English
Subjects:
CADMIUM
CADMIUM TELLURIDES
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
DEPOSITION
ELECTRONS
EMISSION SPECTRA
EXCITONS
PHOTOLUMINESCENCE
POLYCRYSTALS
RECOMBINATION
SUBLIMATION
TEMPERATURE DEPENDENCE
THIN FILMS
VACANCIES
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Low-temperature photoluminescence emission spectra were measured in cadmium telluride (CdTe) samples in which composition was varied to promote either Cd or Te-rich stoichiometry. The ability to monitor stoichiometry is important, since it has been shown to impact carrier recombination. Te-rich samples show transitions corresponding to acceptor-bound excitons (∼1.58 eV) and free-electron to acceptor transitions (∼1.547 eV). In addition to acceptor-bound excitons, Cd-rich samples show transitions assigned to donor-bound excitons (1.591 eV) and Te vacancies at 1.552 eV. Photoluminescence is a noninvasive way to monitor stoichiometric shifts induced by post-deposition anneals in polycrystalline CdTe thin films deposited by close-spaced sublimation.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4867533