Side chain engineering in small molecular acceptor incorporating halogenated group for high performance organic solar cells
발표자
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초록
내용
In the study of active layers for organic solar cells (OSCs), significant progress has been made in developing high-performance devices utilizing polymer donors and small molecular acceptors. Disparity in surface energy levels between the polymer donors and small molecular acceptors influences their miscibility and crystallinity, in turn, affects the power conversion efficiency (PCE). In this study, we developed two novel small molecular acceptors (LA, LAH) by modifying the side chains with halogenated groups, which resulted in distinct surface energy levels. This approach allowed us to investigate the variations in PCE resulting from differences in miscibility and crystallinity. Specifically, LA achieved a PCE of 14.31%, LAH demonstrated PCE of 17.44%. LAH achieved the high PCE due to its optimal miscibility with the donor and balanced crystallinity. These findings highlight the importance of side chain engineering as a pivotal technique for fine-tuning surface energy levels and optimizing the morphology of the active layer in OSCs.