Side-chain modification of polyethylene glycol on conjugated polymers for ternary blend all-polymer solar cells with efficiency up to 9.27%

查看全文 作　　者：Zhenye [1]Li;Baobing [1]Fan;Baitian [1]He;Lei [1]Ying;Wenkai [1]Zhong;Feng [2]Liu;Fei [1]Huang;Yong [1]Cao

机构地区：[1]Institute of Polymer Optoelectronic Materials and Devices,State Key Laboratory of Luminescent Materials and Devices,South China University of Technology;[2]Department of Physics and Astronomy,Shanghai Jiao Tong University

出　　处：《Science China Chemistry》索引2018年第61卷第4期,共10页

基　　金：supported by the National Natural Science Foundation of China(51673069,91633301,51521002,21520102006);Guangdong Natural Science Foundation(2017A030306011);the Pearl River S&T Nova Program of Guangzhou(201710010021);Fundamental Research Funds for the Central Universities 摘　　要：With the rapid progress achieved by all-polymer solar cells(all-PSCs), wide-bandgap copolymers have attracted intensive attention for their unique advantage of constructing complementary absorption profiles with conventional narrow-bandgap copolymers. In this work, we designed and synthesized a wide bandgap ternary copolymer PEG-2% which has the benzodithiophene-alt-difluorobenzotriazole as the backbone and the polyethylene glycol(PEG) modified side chain. The PBTA-PEG-2%:N2200 can be processed with a non-chlorinated solvent of 2-methyl-tetrahydrofuran(MeTHF) for the binary all-PSC, which exhibits a moderate photovoltaic performance. In particular, the ternary all-PSCs that consisting an additional narrow bandgap polymer donor PTB7-Th can also be processed with MeTHF, resulting in an unprecedented power conversion efficiency(PCE)of 9.27%, and a high PCE of 8.05% can be achieved with active layer thickness of 240 nm, both of which are the highest values so far reported from all-PSCs. Detailed investigations revealed that the dramatically improved device performances are attributable to the well-extended absorption band in the photoactive layer. Hence,developing novel copolymers with tailored side chains, and introducing additional polymeric components, can broaden the horizon for high-performance all-PSCs. 关键词：聚乙烯乙二醇太阳能电池聚合物链混合共聚物 PCE 二进制

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Side-chain modification of polyethylene glycol on conjugated polymers for ternary blend all-polymer solar cells with efficiency up to 9.27%

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