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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.
This work was financially supported by the Natural Science Foundation of Jiangsu Province (Nos. BK20190443 and BK20160815), Young Elite Scientists Sponsorship Program by Jiangsu CAST (No. JS19TJGC132574), 2019 Overseas Students Science and Technology Innovation Project Selection Funding of Nanjing, Fundamental Research Funds for the Central Universities (Nos. 30919011298, 30919011299 and 30919012107), the National Key R&D Program of China (No. 2017YFA0305500), the National Natural Science Foundation of China (Nos. 61725402, 11604152, and 51672132), and the Six top talent innovation teams of Jiangsu Province (No. TD-XCL-004).