Lei Xu, Sunsun Li, Wenchao Zhao, Yaomeng Xiong, Jinfeng Yu, Jinzhao Qin, Gang Wang, Rui Zhang, Tao Zhang, Zhen Mu, Jingjing Zhao, Yuyang Zhang, Shaoqing Zhang, Vakhobjon Kuvondikov, Erkin Zakhidov, Qiming Peng, Nana Wang, Guichuan Xing, Feng Gao, Jianhui Hou, Wei Huang, Jianpu Wang
In organic photovoltaic cells, the solution-aggregation effect (SAE) is long considered a critical factor in achieving high power-conversion efficiencies for polymer donor (PD)/non-fullerene acceptor (NFA) blend systems. However, the underlying mechanism has yet to be fully understood. Herein, based on an extensive study of blends consisting of the representative 2D-benzodithiophene-based PDs and acceptor-donor-acceptor-type NFAs, we demonstrate that SAE shows a strong correlation with the aggregation kinetics during solidification, and the aggregation competition between PD and NFA determines the phase separation of blend film and thus the photovoltaic performance...
April 26, 2024: Advanced Materials