Broadband and sensitive two-dimensional halide perovskite photodetector for full-spectrum underwater optical communication

• 作者: Dejian Yu Fei Cao Yu Gu Zeyao Han Jiaxin Liu Bo Huang Xiaobao Xu Haibo Zeng
• 来源期刊: 纳米研究（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: Research Articles
• 页码范围: 1210-1217
• 页数: 8页
• 语种: 英文

摘要

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,end a high detectivity.In this work,two-dimensional (2D) halide perovskites (HPs) and corresponding PDs are constructed by steararnine (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 covedng the entire transmission window of water (＞ 1.55 eV) for full-spectrum UOC can be obtained.Besides,featuring a high reaponsivity 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 waveforrns 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.