Flexible All-Inorganic Perovskite Photodetector with a Combined Soft-Hard Layer Produced by Ligand Cross-Linking

作者：Shi, Tongyu; Chen, Xi; He, Rui^*; Huang, Hao; Yuan, Xinru; Zhang, Zhenyu; Wang, Jiahong; Chu, Paul K.; Yu, Xue-Feng^*

来源：Advanced Science, 2023, 10(22).

DOI：10.1002/advs.202302005

• all-inorganic perovskites
• bendable
• flexible photodetectors
• ligands cross-linking
• nanocrystals
• soft-hard combination

Although perovskite nanocrystals have attracted considerable interests as emerging semiconductors in optoelectronic devices, design and fabrication of a deformable structure with high stability and flexibility while meeting the charge transport requirements remain a huge challenge. Herein, a combined soft-hard strategy is demonstrated to fabricate intrinsically flexible all-inorganic perovskite layers for photodetection via ligand cross-linking. Perfluorodecyltrichlorosilane (FDTS) is employed as the capping ligand and passivating agent bound to the CsPbBr3 surface via Pb-F and Br-F interactions. The Si-Cl head groups of FDTS are hydrolyzed to produce Si-OH groups which subsequently condense to form the Si-O-Si network. The CsPbBr3@FDTS nanocrystals (NCs) are monodispersed cubes with an average particle size of 13.03 nm and exhibit excellent optical stability. Furthermore, the residual hydroxyl groups on the surface of the CsPbBr3@FDTS render the NCs tightly packed and cross-linked to each other to form a dense and elastic CsPbBr3@FDTS film with soft and hard components. The photodetector based on the flexible CsPbBr3@FDTS film exhibits outstanding mechanical flexibility and robust stability after 5000 bending cycles.

• 单位
  中国科学院研究生院