@article{Yu2021, 
author = {Dejian Yu and Fei Cao and Yu Gu and Zeyao Han and Jiaxin Liu and Bo Huang and Xiaobao Xu and Haibo Zeng},
title = {Broadband and sensitive two-dimensional halide perovskite photodetector for full-spectrum underwater optical communication},
year = {2021},
journal = {Nano Research},
volume = {14},
number = {4},
pages = {1210-1217},
keywords = {photodetector, two-dimensional (2D) halide perovskite, water stability, broadband photoresponse, underwater optical communication},
url = {https://www.sciopen.com/article/10.1007/s12274-020-3174-1},
doi = {10.1007/s12274-020-3174-1},
abstract = {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.}
}