Achieved 18.9% Efficiency by Fine-Tuning Non-Fullerene Acceptor Content to Simultaneously Increase the Short-Circuit Current and Fill Factor of Organic Solar Cells

In this study, using PM6:L8-BO as the main system and non-fullerene acceptor IDIC as the third component, a series of ternary organic solar cells (TOSCs) are fabricated. The results reveal that IDIC plays a significant role in enhancing the performance of TOSCs by optimizing the morphology of blended films and forming interpenetrating nanostructure. The improved film morphology facilitates exciton dissociation and collection in TOSCs, which causes an increase in the short-circuit current density (J(SC)) and fill factor (FF). Further, by optimizing the IDIC content, the power conversion efficiency (PCE) of TOSCs reaches 18.9%. Besides, the prepared TOSCs exhibit a J(SC) of 27.51 mA cm(-2) and FF of 76.64%, which are much higher than those of PM6:L8-BO-based organic solar cells (OSCs). Furthermore, the addition of IDIC improves the long-term stability of the OSCs. Meanwhile, TOSCs with a large effective area of 1.00 cm(2) have been prepared, which exhibit a PCE of 12.4%. These findings suggest that modifying the amount of the third component can be a useful strategy to construct hight-efficiency TOSCs with practical application potential.

Automated summary

In this study, ternary organic solar cells (TOSCs) were fabricated using PM6:L8-BO as the main system and non-fullerene acceptor IDIC as the third component. The addition of IDIC significantly enhanced the performance of TOSCs by optimizing the morphology of blended films and forming interpenetrating nanostructure. The improved film morphology facilitated exciton dissociation and collection, resulting in increased short-circuit current density (J(SC)) and fill factor (FF). By optimizing the IDIC content, TOSCs achieved a power conversion efficiency (PCE) of 18.9%. Furthermore, TOSCs exhibited higher J(SC) and FF compared to PM6:L8-BO-based organic solar cells (OSCs), and the long-term stability of the OSCs was improved by the addition of IDIC. TOSCs with a large effective area of 1.00 cm(2) were prepared, demonstrating a PCE of 12.4%. These findings suggest that modifying the amount of the third component can be a useful strategy to construct high-efficiency TOSCs with practical application potential.