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通过Stille聚合反应合成了含有苯并[1,2-b:4,5-b’]二噻吩和二噻吩邻苯二甲酰亚胺的D-A结构平面共聚物PBDTPhBT.该聚合物热稳定性和在常见有机溶剂中的溶解性良好、在380～580nm范围内有强吸收.分子模拟计算的结果表明,聚合物主链具有较好的平面型.PBDTPhBT的光学带隙为2.10eV、用电化学方法测量的HOMO能级为5.23eV.以聚合物PBDTPhBT为给体、PC70BM为受体(给受体重量比为1:1)、Ca/Al为负极制备了本体异质结聚合物太阳能电池.在AM1.5,100mWcm2光照条件下器件的开路电压和短路电流分别为0.79V和5.63mAcm2,能量转换效率达到了1.76%.
The DA structure planar copolymer PBDTPhBT containing benzo [1,2-b: 4,5-b ’] dithiophene and dithiophene phthalimide was synthesized by Stille polymerization.The thermal stability and Solubility in common organic solvents is good, with a strong absorption in the range of 380 ~ 580nm.The molecular simulation results show that the main chain of the polymer has a good planarity.The optical band gap of PBDTPhBT is 2.10eV, with electrochemical The measured HOMO energy level is 5.23eV. Bulk heterojunction polymer solar cells were prepared by using polymer PBDTPhBT as donor, PC70BM as acceptor (donor weight ratio of 1: 1) and Ca / Al as negative electrode. Under AM1.5 and 100mWcm2 illumination conditions, the open-circuit voltage and short-circuit current of the device are 0.79V and 5.63mAcm2 respectively, and the energy conversion efficiency reaches 1.76%.