Search

Ternary blend strategy has been proved to be an effective method to improve the photovoltaic performance for organic solar cells (OSCs). In this work, efficient ternary OSCs are fabricated with one donor PBDB-T and two acceptors Ph -DTDP-TIC and PC 71 BM. Ternary components can form a cascade energy level alignment when PC 71 BM as the third component to enhance charge transfer between the non-fullerene acceptor Ph -DTDP-TIC and PC 71 BM, achieving improved charge separation and collection in the ternary OSCs. Meanwhile, it demonstrated that PC 71 BM as the third component can also improve the morphology of the active layer and form suitable phase separation scale. As a results, two binary devices (PBDB-T: Ph -DTDP-TIC and PBDB-T:PC 71 BM) exhibit moderate power conversion efficiencies (PCEs) of 8.80% and 6.74%, respectively. While, the optimized PBDB-T: Ph -DTDP-TIC:PC 71 BM ternary device can produce an enhanced PCE of 11.07% through adding 40 wt% PC 71 BM in acceptors, originating from simultaneously improved J sc of 17.57 mA/cm2 and FF of 70.90%. Our work demonstrated the ternary strategy with PC 71 BM as the third component can promote charge transfer and transport to improve photovoltaic performance for OSCs. [Display omitted] • The enhanced charge transfer channel formed with dipyran acceptor as the addition of PC 71 BM. • PC 71 BM as ternary component could effectively improve blend morphology. • Ternary strategy could reach the same goal as molecular tailoring in dipyran acceptor. [ABSTRACT FROM AUTHOR]