Haoquan Zhang, Yongxu Hu, Xiaosong Chen, Li Yu, Yinan Huang, Zhongwu Wang, Shuguang Wang, Yunpeng Lou, Xiaonan Ma, Yajing Sun, Jie Li, Deyang Ji, Liqiang Li, Wenping Hu. A Centrosymmetric Organic Semiconductor with Donor–Acceptor Interaction for Highly Photostable Organic Transistors. Adv. Funct. Mater., 2022, DOI: 10.1002/adfm.202111705

Abstract:

Molecule design of organic semiconductors (OSCs) for eliminating photoresponse and maintaining high charge mobility concurrently is beneficial to realize intrinsically photostable and high-performance organic field-effect transistors (OFETs), which has never been reported. Here, a novel organic semiconductor TFP-TT-TPA with a centrosymmetric structure is synthesized. Remarkably, OFETs with TFP-TT-TPA show negligible photoresponse under light intensity up to 170.4 mW cm−2 (higher than sunlight intensity, about 138 mW cm−2), which ensures that the devices can work stably under sunlight. Through the single-crystal structure and exciton dynamics analysis, it is found that the specific structure design can make strong intermolecular D–A interaction that occurs in the aggregate state, which facilitates the process of exciton quenching and thus enables the photostable OFETs. This study provides a new strategy for the design of organic semiconductors with intrinsic photostability and the construction of photostable organic optoelectronic devices for applications in light environment.