Triplet Acceptors with a D‐A Structure and Twisted Conformation for Efficient Organic Solar Cells
Linqing Qin, Xingzheng Liu, Xin Zhang, Jianwei Yu, Lei Yang, Fenggui Zhao, Miaofei Huang, Kangwei Wang, Xiaoxi Wu, Yuhao Li, Hao Chen, Kai Wang, Jianlong Xia, Xinhui Lu, Feng Gao, Yuanping Yi, Hui Huang
Abstract
Abstract Triplet acceptors have been developed to construct high‐performance organic solar cells (OSCs) as the long lifetime and diffusion range of triplet excitons may dissociate into free charges instead of net recombination when the energy levels of the lowest triplet state (T 1 ) are close to those of charge‐transfer states ( 3 CT). The current triplet acceptors were designed by introducing heavy atoms to enhance the intersystem crossing, limiting their applications. Herein, two twisted acceptors without heavy atoms, analogues of Y6, constructed with large π‐conjugated core and D‐A structure, were confirmed to be triplet materials, leading to high‐performance OSCs. The mechanism of triplet excitons were investigated to show that the twisted and D‐A structures result in large spin–orbit coupling (SOC) and small energy gap between the singlet and triplet states, and thus efficient intersystem crossing. Moreover, the energy level of T 1 is close to 3 CT, facilitating the split of triplet exciton to free charges.