期刊
IEEE JOURNAL OF PHOTOVOLTAICS
卷 5, 期 6, 页码 1722-1726出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOTOV.2015.2478061
关键词
Cathodoluminescence; CdTe; grain boundaries; numerical simulations
资金
- U.S. Department of Energy [DE-AC36-08GO28308]
- USDOE Office of Energy Efficiency and Renewable Energy Solar Energy Technologies Program
- National Renewable Energy Laboratory
We present a 2-D numerical model simulating cathodoluminescence (CL) measurements on CdTe. The model is used to analyze the impact of material parameters on the measured CL intensity to establish when grain-boundary (GB) recombination velocity S-GB can be determined accurately from CL contrast. In addition to GB recombination, grain size and its ratio to the carrier diffusion length can impact CL measurements. Holding the grain interior and GB recombination rates constant, we find that as the grain size increases and exceeds the diffusion length, the observed CL contrast increases. For small-grain-size material, surface recombination lowers the overall intensity of the CL signal but does not significantly impact CL contrast. For large grains, high-surface recombination velocity can decrease the CL contrast. The model is combined with experimental results to quantify the S-GB in polycrystalline CdTe before and after the CdCl2 treatment and to predict the impact of GB recombination on device performance.
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