Ambipolar-transport wide-bandgap perovskite interlayer for organic photovoltaics with over 18% efficiency

Anode interface layers (AILs) are of vital importance to the performance of organic photovoltaics (OPVs). Herein, MAPbBr(3) is firstly demonstrated as an effective solution-processed AIL, featuring a 2.3-eV bandgap and high hole and electron mobility. PM6:BO-4Cl based on unannealed device with the MAPbBr3 AIL exhibits an encouraging efficiency of 15.5%. F4TCNQ is further doped into MAPbBr(3) to increase work function and passivate defects, boosting the efficiency to 17.3%. Likewise, the unannealed devices based on PM6:BTP-eC9:PC71BM achieved a high efficiency of 18.3% with the MAPbBr(3)/F4TCNQ AIL. The ambipolar ability of MAPbBr(3) in OPVs was further proved by inverted devices. Therefore, MAPbBr(3) successfully serves multiple functions: a down-conversion layer, an energy donor, and a textured seeding layer influencing bulk-hetero-junction (BHJ) morphology. This finding successfully demonstrates the practicability of wide-bandgap perovskite materials as highly promising OPV interfacial materials.

Automated summary

This study demonstrates the effectiveness of MAPbBr(3) as a solution-processed anode interface layer in organic photovoltaics. By doping and combining MAPbBr(3), the efficiency of OPV devices can be significantly improved. This finding highlights the potential of wide-bandgap perovskite materials as interfacial materials in OPVs.