Fluorobenzotriazole-Based Medium-Bandgap Conjugated D-A Copolymers for Applications to Fullerene-Based and Nonfullerene Polymer Solar Cells
作者:Chao Weng、Wengong Wang、Jingtang Liang、Guo Wang、Songting Tan、Ping Shen
DOI:10.1002/pola.29207
日期:2018.10.15
Two new medium‐bandgap (MBG) donor–acceptor (D–A) conjugated polymers (PSTF and PDTS) with fluorobenzotriazole as an A unit and spiro[cyclopenta[1,2‐b:5,4‐b′]dithiophene‐4,9′‐fluorene] (STF) or dithienosilole (DTS) as the D unit are designed and synthesized as donor materials for polymer solar cell (PSC) applications. PSTF shows a broader absorption spectrum relative to PDTS reflecting an additional
两种新的中带隙(MBG)供体-受体(DA)共轭聚合物(PSTF和PDTS),以氟苯并三唑为A单元和螺[cyclopenta [1,2- b:5,4 - b ']二噻吩-4设计并合成了以9,9'-芴](STF)或二噻吩甲硅烷(DTS)作为聚合物太阳能电池(PSC)应用的供体材料。相对于PDTS,PSTF表现出更宽的吸收光谱,反映出由于STF部分上共轭的噻吩侧链而产生的额外高能吸收带。与PDTS相比,PSTF表现出较弱的π-π聚集和较低的HOMO水平。PSC的光伏特性表明使用PC 61的PSTF或PDTSBM作为受主比ITIC作为受主表现出更好的性能,这是由于PC 61 BM基于PSC的V oc,J sc和FF同时增加所致。此外,与PC 61 BM和ITIC结合使用时,基于PSTF的PSC的效率分别为3.66%和2.42%,分别比基于PDTS的PSC的效率高45%和几乎1.5倍。这可以归因于明显改善的V