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- W2617383404 abstract "In this work, the efficiency of n-type silicon solar cells with a front side boron-doped emitter and a full-area tunnel oxide passivating electron contact was studied experimentally as a function of wafer thickness W and resistivity ρb. Conversion efficiencies in the range of 25.0% have been obtained for all variations studied in this work, which cover 150 µm to 400 µm thick wafers and resistivities from 1 Ω cm to 10 Ω cm. We present a detailed cell analysis based on three-dimensional full-area device simulations using the solar cell simulation tool Quokka. We show that the experimental variation of the wafer thickness and resistivity at device level in combination with a detailed simulation study allows the identification of recombination induced loss mechanisms. This is possible because different recombination mechanisms can have a very specific influence on the I-V parameters as a function of W and ρb. In fact, we identified Shockley-Read-Hall recombination in the c-Si bulk as the source of a significant FF reduction in case of high resistivity Si. This shows that cells made of high resistivity Si are very sensitive to even a weak lifetime limitation in the c-Si bulk. Applying low resistivity 1 Ω cm n-type Si in combination with optimized fabrication processes, we achieved confirmed efficiency values of 25.7%, with a VOC of 725 mV, a FF of 83.3% and a JSC of 42.5 mA/cm2. This represents the highest efficiency reported for both-sides contacted c-Si solar cells. Thus, the results presented in this work demonstrate not only the potential of the cell structure, but also that a variation of the wafer thickness and resistivity at device level can provide deep insights into the cell performance." @default.
- W2617383404 created "2017-06-05" @default.
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- W2617383404 date "2017-12-01" @default.
- W2617383404 modified "2023-10-15" @default.
- W2617383404 title "n-Type Si solar cells with passivating electron contact: Identifying sources for efficiency limitations by wafer thickness and resistivity variation" @default.
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- W2617383404 doi "https://doi.org/10.1016/j.solmat.2017.05.042" @default.
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