To overcome the limitations of batch-to-batch variations and donor material robustness in polymer solar cells(PSCs),we designed quaternary(H1-H9),ternary(H10-H15),and binary(PM6,PBQ10,PBDS-T)polymer donors via precise...To overcome the limitations of batch-to-batch variations and donor material robustness in polymer solar cells(PSCs),we designed quaternary(H1-H9),ternary(H10-H15),and binary(PM6,PBQ10,PBDS-T)polymer donors via precise monomer ratio modulation.Due to the synergistic coordination among multiple components,the H4-based blend film demonstrated enhanced intermolecular interactions and provides additional low-energy-barrier pathways for efficient charge carrier transport.After blending with L8-BO,the H4-based films displayed a more desirable morphology and effective charge carrier transport than the categories.As a result,the H4:L8-BO-based PSCs achieved impressive power conversion efficiency(PCE)of 19.66%for binary device and 20.34%for ternary device.Besides,the introduced functional groups disrupt the regularity of the matrix polymer main chain,leading to stable and robust film morphologies.Consequently,the H4:L8-BO-based blend film not only demonstrates improved mechanical robustness,with a crack onset strain(COS)of 17.8%,and maintains a PCE of 16.35%in flexible devices,but also exhibits excellent batch-to-batch stability with significant variations in molecular weight.This work presents a strategy to simultaneously enhance device performance,mechanical robustness,and reproducibility through quaternary copolymerization,enabling controlled crystallinity and additional multichannel charge transport.展开更多
基金the support from the National Natural Sci-ence Foundation of China(NSFC)(52573190 and 52303317)the Jiangxi Provincial Natural Science Foundation(20252BAC240231)+1 种基金National Key Research and Development Program of China(2023YFB4704004)Fundamental Research Funds for the Central Universities(2024IAIS-QN016).
文摘To overcome the limitations of batch-to-batch variations and donor material robustness in polymer solar cells(PSCs),we designed quaternary(H1-H9),ternary(H10-H15),and binary(PM6,PBQ10,PBDS-T)polymer donors via precise monomer ratio modulation.Due to the synergistic coordination among multiple components,the H4-based blend film demonstrated enhanced intermolecular interactions and provides additional low-energy-barrier pathways for efficient charge carrier transport.After blending with L8-BO,the H4-based films displayed a more desirable morphology and effective charge carrier transport than the categories.As a result,the H4:L8-BO-based PSCs achieved impressive power conversion efficiency(PCE)of 19.66%for binary device and 20.34%for ternary device.Besides,the introduced functional groups disrupt the regularity of the matrix polymer main chain,leading to stable and robust film morphologies.Consequently,the H4:L8-BO-based blend film not only demonstrates improved mechanical robustness,with a crack onset strain(COS)of 17.8%,and maintains a PCE of 16.35%in flexible devices,but also exhibits excellent batch-to-batch stability with significant variations in molecular weight.This work presents a strategy to simultaneously enhance device performance,mechanical robustness,and reproducibility through quaternary copolymerization,enabling controlled crystallinity and additional multichannel charge transport.
