Elastomer Incorporated Block Copolymer-Typed Donor Enables High Performance and Stretchable Solar Cell
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High efficiency and superior stretchability are the main factors of polymer solar cells (PSCs).The popular polymer donors (PDs) and small molecule acceptors (SMAs) in PSC exhibithigher optoelectrical properties but simultaneously show inferior stretchability. Thus, block copolymer (BCP) consisting of conjugated PD block and flexible elastomer block can address this low stretchability by using the flexible elastomer without phase separation in the active layer. Thus, we designed PD (PM6)-b-Poly(dimethylsiloxane) (PDMS)-typed BCP to realize highly efficient and stretchable PSCs. We find that PM6-b-PDMS typed BCP showed higher efficiency (> 17.5%) and higher mechanical robustness (COS > 18%) compared to the reference PM6:L8-BO blend (COS < 3%). Interestingly, PM6:L8-BO:PDMS ternary blend showed lower efficiency (4.13%) and mechanical robustness (COS < 3%). This study implies the importance of utilization of elastomer by BCP method to realize high performance and mechanically robust PSCs.