期刊
OPTICS EXPRESS
卷 23, 期 7, 页码 A382-A390出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.23.00A382
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资金
- Solar Energy Research Institute of Singapore (SERIS)
- Singapore-MIT Alliance for Research and Technology (SMART)
- National University of Singapore (NUS)
- Singapore's National Research Foundation (NRF) through the Singapore Economic Development Board (EDB)
Si based tandem solar cells represent an alternative to traditional compound III-V multijunction cells as a promising way to achieve high efficiencies. A theoretical study on the energy yield of GaAs on Si (GaAs/Si) tandem solar cells is performed to assess their energy yield potential under realistic illumination conditions with varying spectrum. We find that the yield of a 4-terminal contact scheme with thick top cell is more than 15% higher than for a 2-terminal scheme. Furthermore, we quantify the main losses that occur for this type of solar cell under varying spectra. Apart from current mismatch, we find that a significant power loss can be attributed to low irradiance seen by the sub-cells. The study shows that despite non-optimal bandgap combination, GaAs/Si tandem solar cells have the potential to surpass 30% energy conversion efficiency. (C) 2015 Optical Society of America
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