Mechanism for radiative recombination in ZnCdO alloys

被引：28

作者：

Department of Physics, Chemistry and Biology, Linköping University, S-581 83 Linköping, Sweden ^{[1
]}

不详 ^{[2
]}

不详 ^{[3
]}

机构：

[1] Department of Physics, Chemistry and Biology, Linköping University

[2] Department of Materials Science and Engineering, University of Florida, Gainesville

[3] SVT Associates, Eden Prairie

来源：

Appl Phys Lett | 2007年 / 26卷

基金：

美国国家科学基金会;

关键词：

Absorption spectroscopy - Electron tunneling - Energy transfer - Excitons - Molecular beam epitaxy - Radiative transfer - Thermal effects;

D O I：

10.1063/1.2751589

中图分类号：

学科分类号：

摘要：

Temperature dependent cw- and time-resolved photoluminescence combined with absorption measurements are employed to evaluate the origin of radiative recombination in ZnCdO alloys grown by molecular-beam epitaxy. The near-band-edge emission is attributed to recombination of excitons localized within band tail states likely caused by nonuniformity in Cd distribution. Energy transfer between the tail states is argued to occur via tunneling of localized excitons. The transfer is shown to be facilitated by increasing Cd content due to a reduction of the exciton binding energy and, therefore, an increase of the exciton Bohr radius in the alloys with a high Cd content. © 2007 American Institute of Physics.

引用

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