Broadband and sensitive two-dimensional halide perovskite photodetector for full-spectrum underwater optical communication
two-dimensional (2D) halide perovskite, photodetector, water stability, broadband photoresponse, underwater optical communication
Full-spectrum underwater optical communication (UOC) is of great significance for major strategic needs including resource development, scientific exploration, and homeland security. As the core of the full-spectrum UOC system, photodetectors (PDs) are plagued by stringent requirements including a broadband response, intrinsic water resistance, and a high detectivity. In this work, two-dimensional (2D) halide perovskites (HPs) and corresponding PDs are constructed by stearamine (SA), representing the rarely explored long-chain aliphatic amine series, to own waterproofness, ultralow noise, and superior optoelectronic performance, which consequently enable a high suitability for UOC. By dimensionality and composition modulations to extend the absorption onset down to 1.5 eV, a broadband response covering the entire transmission window of water (> 1.55 eV) for full- spectrum UOC can be obtained. Besides, featuring a high responsivity of 3.27 A·W−1, a peak external quantum efficiency (EQE) of 630%, fast rise/decay times of 0.35 ms/0.54 ms, a superior detectivity up to 1.35 × 1012 Jones and the capability to distinguish various waveforms and light intensities, the PDs present sensitive and persistent photoresponse underwater. As a result, proof-of-concept wireless transmission of ASCII codes in water is demonstrated.
Tsinghua University Press
Dejian Yu, Fei Cao, Yu Gu, Zeyao Han, Jiaxin Liu, Bo Huang, Xiaobao Xu, Haibo Zeng. Broadband and sensitive two-dimensional halide perovskite photodetector for full-spectrum underwater optical communication. Nano Research 2021, 14(4): 1210-1217.