Synthesis and photovoltaic properties of new donor–acceptor (D–A) copolymers based on benzo[1,2-b:3,4-b′:6,5-b′′] trithiophene donor and different acceptor units (P1 and P2)
作者:M. L. Keshtov、Y. Deng、Z. Xie、Y. Geng、S. A. Kuklin、V. S. Kochurov、A. R. Khokhlov、E. N. Koukaras、G. D. Sharma
DOI:10.1039/c4ra05680a
日期:——
Two new conjugated D–A copolymers P1 (PBTT-TQ) and P2 (PBTT-TPz) based on the same benzo[1,2-b:3,4-b′:6,5-b′′] trithiophene (BTT) donor and different acceptor monomers 4,9-bis(5-bromithiophen-2-yl)-6,7-bis(2-ethylhexyl)[1,2,5] thiadiazolo[3,4-g] quinoxaline (TQ) and 5,7-bis(5-bromothiophen-2-yl)-2,3-bis(5-octylthiophen-2-yl) thieno[3,4-b] pyrazine (TPy), respectively, were synthesized by Stille cross-coupling
基于相同的苯并[1,2- b:3,4- b ':6,5- b '']三噻吩(BTT )的两种新型共轭D–A共聚物P1(PBTT-TQ)和P2(PBTT-TPz))供体和不同的受体单体4,9-双(5-溴噻吩-2-基)-6,7-双(2-乙基己基)[1,2,5]噻二唑[3,4- g ]喹喔啉(TQ)通过Stille cross合成5,7-双(5-溴噻吩-2-基)-2,3-双(5-辛基噻吩-2-基)噻吩并[3,4- b ]吡嗪(TPy)偶联反应,并通过凝胶渗透色谱(GPC),1 H NMR,UV-Vis吸收,热分析和电化学循环伏安(CV)测试进行表征。的光学带隙P1和从薄膜中这些共聚物的光吸收开始测得的P2分别为1.14eV和1.38eV。使用P1和P2作为施主,以PC 61 BM或PC 71 BM为受主,聚合物:PC 61 BM的重量比为1:1、1:2和1:1来研究本体异质结(BHJ)器件的光伏性能。3