Low structure order acceptor as third component enables high-performance semitransparent organic solar cells

Abstract Semitransparent organic solar cells (ST-OSCs) are promising candidates for building-integrated photovoltaics. However, the inherent contradiction between active layer absorption and average visible transmittance (AVT) hinders the development of ST-OSCs. Herein, we report high-performance ternary ST-OSCs by incorporating low structure order DCB-4F into PM6:DTPSe-4Cl host blend. The addition of DCB-4F enhances the molecular arrangement in proper multi-length morphology for enhanced charge transport in active layers. As a result, outstanding PCEs of 15.93% and 12.58% are achieved for the corresponding opaque and semitransparent ternary OSCs, respectively. Our work demonstrates that ternary OSCs by introducing low structure order third component to host binary blends featuring ordered molecular arrangement and low energy loss have great potential for fabricating highly-efficient ST-OSCs.