15.4% Efficiency all-polymer solar cells

作者：Zhang, Long; Jia, Tao; Pan, Langheng; Wu, Baoqi; Wang, Zaiyu; Gao, Ke; Liu, Feng; Duan, Chunhui^*; Huang, Fei^*; Cao, Yong

来源：Science China Chemistry, 2021, 64(3): 408-412.

DOI：10.1007/s11426-020-9935-2

• all-polymer solar cells
• molecular weight
• morphology
• device performance

We report all-polymer solar cells (All-PSCs) with record-high power conversion efficiency (PCE) through tuning the molecular weights of the polymer donor (PBDB-T) to form optimal active layer morphology. By combining the polymer donors with a newly reported polymer acceptor (PJ1), an unprecedented high PCE of 15.4% and fill factor over 75% were achieved for the All-PSCs with the medium molecular weight polymer donor (PBDB-T-MW), which is the highest value for All-PSCs reported so far. Detailed morphology investigation revealed that the proper phase separation in the PBDB-T-MW:PJ1 blend should account for the superior device performance as PBDB-T-MW exhibits appropriate miscibility with the polymer acceptor PJ1. These results demonstrated that the device performance of All-PSCs could be fully comparable to that of small molecular acceptor-based PSCs. The formation of optimized morphology via precise control of molecular weights of polymer donors and acceptors is crucial to achieve this goal.

• 单位
  上海交通大学