Realization of vis–NIR Dual-Modal Circularly Polarized Light Detection in Chiral Perovskite Bulk Crystals

• Published in: Journal of the American Chemical Society Vol. 143; no. 35; pp. 14077 - 14082
• Main Authors: Peng, Yu, Liu, Xitao, Li, Lina, Yao, YunPeng, Ye, Huang, Shang, Xiaoying, Chen, Xueyuan, Luo, Junhua
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 08.09.2021
• Subjects: absorption; anisotropy; electric current; night vision
• ISSN: 0002-7863; 1520-5126; 1520-5126
• DOI: 10.1021/jacs.1c07183

Circularly polarized light (CPL)-sensitive direct detection is attracting increasing attention owing to its various optical technology applications and ultracompact device structures. However, current CPL-sensitive direct detection mainly focuses on a single mode, whereas the visible–near-infrared (vis–NIR) dual-modal detection, which is important for improving device sensitivity and night-vision performance, still remains to be explored. Here, for the first time, the vis–NIR dual-modal CPL-sensitive direct detection is presented in bulk single crystals of two-dimensional chiral perovskite (R-BPEA)2PbI4 (R-BPEA = (R)-1-(4-bromophenyl)­ethyl­ammonium). Benefiting from the strong light–matter interaction of the layered structure, (R-BPEA)2PbI4 shows a two-photon absorption (TPA) coefficient of up to 55 cm/MW, which almost falls around the highest value of 2D hybrid perovskites. Notably, (R-BPEA)2PbI4 exhibits a high vis–NIR dual-modal CPL-sensitive direct detecting performance under both visible light (520 nm) and NIR light (800 nm), with the on/off ratios of current higher than 103, and the anisotropy factors for photocurrent higher than 0.1. This work will shed light on the design of new chiral semiconductors with a large TPA coefficient and promote their applications in vis–NIR dual-modal CPL-sensitive direct detection.