Silicon phthalocyanine passivation for fullerene-free perovskite solar cells with efficient electron extraction

Abstract

Replacing fullerene with other organic materials is important for exploring perovskite solar cells (PVSCs) with better diversity and performance. In this study, a passivation/transport bilayer structure is employed in fullerene-free perovskite solar cells. The proposed fullerene-free PVSCs based on MAPbI3 show power conversion efficiency of up to 19.2%, which is among the best value reported so far. We have demonstrated that, besides employing an efficient electron transport layer, passivating the perovskite surface with silicon phthalocyanine based molecules (SiPc-Py-2) is a key issue to prevent current hysteresis and open-circuit voltage loss.