Asymmetric Non-Fullerene Acceptor Derivatives Incorporated Ternary Organic Solar Cells

Incorporating ITIC derivatives as guest acceptors intobinary hostsystems is an effective strategy for constructing high-performanceternary organic solar cells (TOSCs). In this work, we introduced A-D-Atype ITIC derivatives PTBTT-4F (asymmetric) and PTBTP-4F (symmetric)into the PM6:BTP-BO-4F (Y6-BO) binary blend and investigated the impactsof two guest acceptors on the performance of TOSCs. Differentiateddevice performance was observed, although PTBTT-4F and PTBTP-4F presentedsimilar chemical structures and comparable absorptions. The PTBTT-4Fternary devices exhibited an improved power conversion efficiency(PCE) of 17.67% with increased open circuit (V (OC)) and current density (J (SC)), whereas the PTBTP-4F-based ternary devices yielded a relativelylower PCE of 16.34%. PTBTT-4F showed much bettercompatibility with the host acceptor BTP-BO-4F, so that they formeda well-mixed alloy phase state; more precise phase separation andincreased crystallinity were thus induced in the ternary blends, leadingto reduced molecular recombination and improved charge mobilities,which contributed to improved fill factors of the ternary devices.In addition, the optimized PTBTT-4F devices exhibited good performancetolerance of the photoactive layer thickness, as they even delivereda PCE of 15.25% when the active layer was as thickas up to & SIM;300 nm.

Automated summary

Incorporating ITIC derivatives as guest acceptors into binary host systems is an effective strategy for constructing high-performance ternary organic solar cells (TOSCs). In this work, A-D-A type ITIC derivatives PTBTT-4F and PTBTP-4F were introduced into the PM6:BTP-BO-4F binary blend, and their impact on TOSC performance was investigated. Different device performances were observed, with PTBTT-4F ternary devices exhibiting an improved power conversion efficiency (PCE) of 17.67% and PTBTP-4F-based ternary devices yielding a relatively lower PCE of 16.34%.