Synthesis, characterization and photovoltaic properties of dithienobenzodithiophene-based conjugated polymers
作者:Caili Lang、Jingzhe Fan、Yueyue Gao、Ming Liu、Yong Zhang、Fengyun Guo、Liancheng Zhao
DOI:10.1016/j.dyepig.2016.09.064
日期:2017.2
Two new donor-acceptor typed conjugated polymers (P1 and P2) based on the large coplanar and more-extended donor dithieno[2,3-d:2,3-d′]benzo[1,2-b:4,5-b′]dithiphene and thienopyrroledione (TPD) units were synthesized. P1 and P2 have the same polymer backbone, but with different side chains, where P1 has 2-ethylhexyl side chains and P2 has the longer branched 4-ethyoctyl side chains. The solubility
基于大的共平面且延伸范围更大的供体双硫双[2,3- d:2,3- d ']苯并[1,2- b:4,5- ]的两种新的供体-受体型共轭聚合物(P1和P2)b′]二噻吩和噻吩并二酮(TPD)单元被合成。P1和P2具有相同的聚合物主链,但具有不同的侧链,其中P1具有2-乙基己基侧链,P2具有较长的支链4-乙基辛基侧链。溶解度测量结果表明,具有更长支链4-乙基辛基侧链的P2在有机溶剂中的溶解度高于P1。研究了光学,电化学和光电性能。P1和P2在溶液状态和薄膜状态下均显示出非常相同的吸收特征,表明P1和P2中聚合物链的分子平面性增强,这得益于大的共平面二硫杂[2,3- d:2,3- d ']苯并[1,2- b:4,5- b”]二噻吩单位。P1和P2的带隙分别为1.83 eV和1.74 eV。制作并在100 mW cm -2的AM 1.5G光照下测量以P1或P2作为电子给体组分和PC 71 BM作为电子受体的太阳能电池。结果表明,基于P2