基于苯并三噻吩共聚物/富勒烯衍生物的聚合物太阳能电池

Solar Cell Based on Benzotrithiophene Copolymer and Fullerene Derivative

以苯并三噻吩共聚物(BTT-BTz)为给体材料,具有不同能级结构的富勒烯衍生物为受体材料,通过共混方式制备光敏薄膜,并研究受体材料的能级结构对光伏器件开路电压(Voc)、短路电流(Jsc)、填充因子(FF)和电池效率(PCE)的影响.结果表明:当IC60BA为电子受体材料时,器件的Voc=1.06V,但Jsc较低,使得PCE仅为1.49%;当PC60BM和PC70BM为受体材料时,Voc分别为0.86V和0.81V,但Jsc较高,使得PCE分别为3.22%和5.06%.

The energy level of the electron acceptor plays an important role in bulk heteroj unction solar cells.A conj ugated polymer BTT-BTz as electron donor and fullerene derivatives PC70 BM,PC60 BM and IC60 BA as acceptor with different energy levels was studied,and the influence of the acceptor energy level on the open-circuit voltage （Voc ）,short-circuit current density （J sc ）,fill factor （FF）and power conversion efficiency （PCE）were investigated.The BTT-BTz/IC60 BA based device exhibited a highVoc of 1.06 V,but the poor PCE of 1.49% due to the lower Jsc.Although theVoc of the devices based on BTT-BTz/PC60 BM and BTT-BTz/PC70 BM is decreased,they displayed promising efficiencies of 3.2 2% and 5 .0 6%.