Efficient ternary polymer solar cell using wide bandgapconjugated polymer donor with two non-fullerene smallmolecule acceptors enabled power conversion efficiency of16% with low energy loss of 0.47 eVстатьяИсследовательская статья
Дата последнего поиска статьи во внешних источниках: 23 сентября 2021 г.
Аннотация:The ternary polymer solar cells (PSCs)were fabricated using a wide bandgap conjugatedpolymer P and two non-fullerene small molecule acceptors, i.e. Y6 andBThIND-Cl, in which the BThIND-Cl was introduced as the third component.The open-circuit voltage (Voc) of ternary PSCs increased with the increase ofBThIND-Cl content in the acceptors, signifying the formation of an alloy betweenBThIND-Cl and Y6.We have observed that the energy loss of the ternary PSCs isdecreased as compared to the binary counterparts, contributing to the improvementin Voc of ternary PSCs. The short circuit current as well as fill factor (FF) ofthe ternary PSCs were also enhanced with 0.4 weight ratio of BThIND-Cl in theacceptors i.e.P:BThIND-Cl:Y6 (1:0.4:1.1), resulting in overall power conversionefficiency (PCE) up to 16.08% of the optimized ternary PSCs. The improvementin the short circuit current and FF of the ternary PSCs is originated fromthe moremolecular packing and molecular crystallinity, efficient light harvesting, excessexciton generation dissociation, and balanced charge transport. Moreover, thelow value of the energy loss (0.47 eV) which may be lowest for the ternary basedPSCs with PCE exceeding 16% which may be originated from the suppressednon-radiative recombination loss. The might be due to the small highest occupiedmolecularorbital offsets between the combined alloyed acceptor and donor,resulting to the improvement in Voc for ternary PSC as compared to P:Y6 basedPSCs.
