Binary Solvent Additives Treatment Boosts the Efficiency of PTB7:PCBM Polymer Solar Cells to Over 9.5%
Yifan Zheng, Gang Wang, Di Huang, Jaemin Kong, TengHooi Goh, Wei Huang, Junsheng Yu, André D. Taylor
In article number 1700144, Yifan Zheng, Junsheng Yu and co‐workers demonstrate a high efficiency polymer solar cell (PSC) through introducing a novel binary solvent additive combination of DPE:DIO (diphenyl ether und 1,8‐diiodoctane). This binary solvent additive system of DPE:DIO combines the influence of DIO on the PC70BM dispersion together with that of DPE on the PTB7 crystallization. As a result, a significant improvement in power conversion efficiency from 6.96% to over 9.25% has been obtained, which is among the best results reported so far in the literature for PTB7:PC70BM PSCs. It is believed that this approach could have a broad appeal towards improving PSC performance by separately controlling the morphology of donor crystallinity and fullerene dispersion, thus providing an ideal platform for record‐breaking PSCs in the near future.