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A good quality ZnS thin film has been functionalized as back surface field (BSF) in Si solar cells. Compared to Si solar cells without BSF, the solar cells with ZnS BSF presents about 50% increase of the power conversion efficiency (PCE). This improvement stems from a downward energy band at the c-Si (n)/ZnS interface, which forms an interfacial field-effect. This field impedes the minority carrier...
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