Buried-in interface with two-terminal functional groups for perovskite-based photovoltaic solar cells

Interface plays an important role in perovskite solar cells. Herein, a functional molecular with two-terminal donor groups was deposited between the tin oxide (SnO2) electron transport layer and halide to induce crystal growth passivate defects at interface. It is found that isonicotinohydrazide (INHA) can anchor Pb2+ cluster precursor promote uniform nucleation, which helps adjust films. As well, more analysis shows interfacial modification greatly reduce trap therefore facilitate photogenerated carrier-transferring. The efficient transfer reduced interface traps correlate well corresponding fill factors open-circuit voltages (VOC) of working devices. resulting cell exhibits striking improvements reach champion efficiency 21.12%. long-term stability also significantly enhanced by comparing pristine This work highlights effect INHA/perovskite interaction provides multi-functional passivation strategy for further perfecting