期刊
IEEE JOURNAL OF PHOTOVOLTAICS
卷 8, 期 2, 页码 587-593出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOTOV.2017.2787021
关键词
Cadmium compounds; photovoltaic cells; sputtering; thin films
资金
- U.S. Department of Energy Photovoltaics R&D: Small Innovative Projects in Solar [DE-EE0007365]
- U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy(at NREL) [DE-AC36-08GO28308]
Commercial CdTe PV modules have polycrystalline thin films deposited on glass, and devices made in this format have exceeded 22% efficiency. Devices made by the authors with a magnesium zinc oxide window layer and tellurium back contact have achieved efficiency over 18%, but these cells still suffer from an open-circuit voltage far below ideal values. Oxide passivation layers made by sputter deposition have the potential to increase voltage by reducing interface recombination. CdTe devices with these passivation layers were studied with photoluminescence (PL) emission spectroscopy and time-resolved photoluminescence (TRPL) to detect an increase in minority carrier lifetime. Because these oxide materials exhibit barriers to carrier collection, micropatterning was used to expose small point contacts while still allowing interface passivation. TRPL decay lifetimes have been greatly enhanced for thin polycrystalline absorber films with interface passivation. Device performance was measured and current collection was mapped spatially by light-beam-induced current.
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