Approaching 19% Efficiency and Stable Binary Polymer Solar Cells Enabled by a Solidification Strategy of Solvent Additive

Manjun Xiao,Longfei Liu,Yongdie Meng,Baobing Fan,Wenyan Su,Conggui Jin,Luocheng Liao,Fan Yi,Chao Xu,Rui Zhang,Alex K.-Y. Jen,Wei Ma,Qunping Fan

Science China Chemistry（2023）

Xiangtan Univ | Department of Chemistry | School of Materials Science and Engineering | Department of Physics | State Key Laboratory for Mechanical Behavior of Materials

Cited 8|Views20

Abstract

Additives play a crucial role in enhancing the photovoltaic performance of polymer solar cells(PSCs).However,the typical additives used to optimize blend morphology of PSCs are still high boiling-point solvents,while their trace residues may reduce device stability.Herein,an effective strategy of"solidification of solvent additive(SSA)"has been developed to convert additive from liquid to solid,by introducing a covalent bond into low-cost solvent diphenyl sulfide(DPS)to synthesize solid di-benzothiophene(DBT)in one-step,which achieves optimized morphology thus promoting efficiency and device stability.Owing to the fine planarity and volatilization of DBT,the DBT-processed films achieve ordered molecular crystallinity and suitable phase separation compared to the additive-free or DPS-treated ones.Importantly,the DBT-processed device also possesses improved light absorption,enhanced charge transport,and thus a champion efficiency of 17.9％is achieved in the PM6:Y6-based PSCs with an excellent additive component tolerance,reproducibility,and stability.Additionally,the DBT-processed PM6:L8-BO-based PSCs are further fabricated to study the universality of SSA strategy,offering an impressive efficiency approaching 19％as one of the highest values in binary PSCs.In conclusion,this article developed a promising strategy named SSA to boost efficiency and improve stability of PSCs.

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Key words

polymer solar cells,solidification of solvent additives,power conversion efficiency,device stability

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