期刊
APPLIED PHYSICS LETTERS
卷 95, 期 26, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3274131
关键词
carrier lifetime; conduction bands; doping profiles; electron-hole recombination; II-VI semiconductors; multiphoton processes; oxygen; photoluminescence; semiconductor doping; semiconductor thin films; solar cells; time resolved spectra; valence bands; zinc compounds
资金
- American Chemical Society
- Center for Solar and Thermal Energy Conversion
- U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0000957]
Carrier generation and recombination processes of ZnTeO thin films are studied by time-resolved photoluminescence, where carrier lifetimes at oxygen states and the conduction band are inferred to be >1 mu s and < 100 ps, respectively. The radiative recombination coefficient for optical transitions from oxygen states to the valence band is extracted to be 1.2x10(-10) cm(3) sec(-1) based on the excitation dependence of decay time constants. Rate equation analysis further suggests an increase in electron lifetime at the conduction band as oxygen states occupation is critical in achieving high conversion efficiency for solar cells based on multiphoton processes in these materials.
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