Cd-Rich and Te-Rich Low-Temperature Photoluminescence in Cadmium Telluride

D. S. Albin; D. Kuciauskas; J. Ma; W. K. Metzger; J. M. Burst; H. R. Moutinho; P. C. Dippo

doi:10.1063/1.4867533

Cd-Rich and Te-Rich Low-Temperature Photoluminescence in Cadmium Telluride

D. S. Albin, D. Kuciauskas, J. Ma, W. K. Metzger, J. M. Burst, H. R. Moutinho, P. C. Dippo

Chemistry and Nanoscience

National Renewable Energy Laboratory

Research output: Contribution to journal › Article › peer-review

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Abstract

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.

Original language	American English
Article number	092109
Number of pages	4
Journal	Applied Physics Letters
Volume	104
Issue number	9
DOIs	https://doi.org/10.1063/1.4867533 https://doi.org/10.1063/1.4867533
State	Published - 3 Mar 2014

NREL Publication Number

NREL/JA-5200-61039

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title = "Cd-Rich and Te-Rich Low-Temperature Photoluminescence in Cadmium Telluride",

abstract = "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.",

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T1 - Cd-Rich and Te-Rich Low-Temperature Photoluminescence in Cadmium Telluride

AU - Albin, D. S.

AU - Kuciauskas, D.

AU - Ma, J.

AU - Metzger, W. K.

AU - Burst, J. M.

AU - Moutinho, H. R.

AU - Dippo, P. C.

PY - 2014/3/3

Y1 - 2014/3/3

N2 - 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.

AB - 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.

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Cd-Rich and Te-Rich Low-Temperature Photoluminescence in Cadmium Telluride

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