Abstract
Organic semiconductors have been widely studied as interfacial layers to improve the performance of photovoltaics based on emerging absorber materials, such as organic bulk heterojunctions or methylammonium lead halide perovskites. Despite the intense practical interest, fundamental insight into how such interfacial layers affect the interfacial charge-transfer processes underlying selectivity and recombination is more limited. We use the silicon interdigitated back-contact (IBC) solar cell to determine well-defined measures of the selectivity and recombination for organic semiconductor contacts to silicon and to separate the contributions of electron/hole charge-transfer velocities and barrier heights in determining the selectivity. Two primary parameters are measured: R = (Jon/Jon*)(Jop/Jop*) and Sh = Jop/Jon, where Jon and Jop are the exchange current densities for electrons and holes at the interface and the starred quantities are maximum reference values given by ideal thermionic emission theory. The...
Published Version
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