Improvement of photovoltaic properties of benzo[1,2-b:4,5-b′]difuran-conjugated polymer by side-chain modification

查看全文 作　　者：Yun [1]Li;Guangkai [1]Lu;Linglong [1]Ye;Hwa Sook [2]Ryu;Yunhao [1]Cai;Han Young [2]Woo;Yan [1]Li;Yanming [1]Sun 机构地区：[1]School of Chemistry,Beihang University,Beijing 100191,China;[2]Department of Chemistry,College of Science,Korea University,Seoul 136-713,Republic of Korea 出　　处：《ChemPhysMater》索引2023年第2卷第3期,共6页 基　　金：supported by the National Natural Sci-ence Foundation of China(Grant Nos.51825301 and 52022099);China Postdoctoral Science Foundation(BX20190023);H.Y.W acknowl-edges the financial support of the National Research Foundation of Ko-rea(2019R1A6A1A11044070). 摘　　要：The development of polymer solar cells(PSCs)for the donor materials based on benzo[1,2-b:4,5-b′]dithiophene(BDT)has significantly boosted the power conversion efficiency(PCE).However,the PCE of polymer donor materials for benzo[1,2-b:4,5-b′]difuran(BDF)-based lags far behind that of their BDT analogs.To further explore efficient copolymers based on BDF units,a two-dimensional(2D)side-chain strategy was proposed to investigate the atom-changing effects on the copolymer donors for the properties of electron and optical.In this study,we designed and synthesized three new BDF-based copolymer donor materials,named PBDF-C,PBDF-O,and PBDF-S.Owing to the balanced charge transport and favorable phase separation of PBDF-S:Y6,a high PCE of 13.4%,a short-circuit current(J sc)of 25.48 mA cm−2,an open-circuit voltage(V oc)of 0.721 V,and a fill factor(FF)of 72.6%was obtained.This research demonstrates that the BDF building block has great potential for constructing conjugated copolymer donors for high-performance PSCs and that 2D side-chain modification is a facile approach for designing high-performance BDF-based copolymer materials. 关 键 词：Polymer solar cells BENZODIFURAN Side-chain modification Polymer donor Efficiency