摘要
We reported enhanced performance of polymer solar cells, based on poly(3-hexylthiophene):[6,6]-phenylC_(61)-butyric acid methyl ester(P3HT:PC_(61)BM) and polythieno[3,4-b]-thiophene-co-benzodithiophene:[6,6]-phenylC_(71)-butyric acid methyl ester(PTB7:PC_(71)BM) photovoltaic systems, by a two-step dissolution treatment of photoactive blends. Optical and morphological characterization revealed that the composition of the ordered polymer and donor/acceptor phase structure in the photoactive layer can be optimized using a two-step dissolution treatment. In addition, time-resolved photoluminescence indicated that exciton dissociation efficiency could be increased using this method. Current density-voltage(J-V) measurements showed that power conversion efficiencies(PCE) of the two-step dissolution treated devices were higher than those of one-step treated devices by 24% and 8% for P3HT:PC61BM and PTB7:PC_(71)BM systems, respectively. Therefore, this two-step dissolution treatment further optimizes the performance of polymer solar cells.
本文以P3HT:PC_(61)BM和PTB7:PC_(71)BM两种有机光伏体系为研究对象,探讨了光伏材料的"两步"溶解处理对聚合物太阳电池性能的影响.P3HT:PC_(61)BM光活性层的光学与形貌表征揭示了P3HT的有序相结构和给/受体相分离结构可以被"两步"溶解处理进一步优化;瞬态荧光数据表明,P3HT:PC_(61)BM光活性材料经"两步"溶解处理后,激子的分离能力得到增强.经"两步"溶解处理后的器件性能较"一步"溶解处理的器件性能提高了24%.此外,同样的处理方式应用于PTB7:PC_(71)BM体系,可使器件的光伏性能提高8%.因此,光活性材料的"两步"溶解处理是一种简单、有效的提高聚合物光伏性能的优化方法.
基金
supported by the National Natural Science Foundation of China(21603020,61505018 and 51503022)
the Scientific and Technological Research Program of Chongqing Municipal Education Commission(KJ1501116 and KJ1401122)
the Basic and Frontier Research Program of Chongqing Municipality(cstc2016jcyjA0451,cstc2015jcyjA90020 and cstc2016jcyjA0140)
the Introduction of Talent Projects of Chongqing University of Arts and Sciences(R2014CJ05 and R2012CH09)
The study was also supported by NPRP grant#NPRP7227-1-034 from Qatar National Research Fund
