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Relating the open-circuit voltage to interface molecular properties of donor:acceptor bulk heterojunction solar cells
Physical Review B
The open-circuit voltage ͑V oc ͒ of polymer:fullerene bulk heterojunction solar cells is determined by the interfacial charge-transfer ͑CT͒ states between polymer and fullerene. Fourier-transform photocurrent spectroscopy and electroluminescence spectra of several polymer:fullerene blends are used to extract the relevant interfacial molecular parameters. An analytical expression linking these properties to V oc is deduced and shown to be valid for photovoltaic devices comprising three commonlydoi:10.1103/physrevb.81.125204 fatcat:gvxpcxudozf7bkeyta5b6ymo7a