Self-Powered and High-Performance Alternating Current Photodetectors to enhance Broadband Photodetection,Advanced Electronic Materials

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Self-Powered and High-Performance Alternating Current Photodetectors to enhance Broadband Photodetection
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2022-07-15 , DOI: 10.1002/aelm.202200392
Ranveer Singh _{1,

2} , Mohit Kumar _{1,

2} , Unjeong Kim _{1,

2} , Hyungtak Seo _{1,

2}

Affiliation

Self-powered broadband photodetectors that are easy to fabricate and convenient to operate are highly desirable in numerous optoelectronic applications; however, achieving a fast response time with high sensitivity remains a daunting challenge to their widespread use. In this study, a self-powered, high-performance alternating current photodetector is fabricated by coating plasmonic Au nanoparticles (NPs) onto MoO₃. The self-powered photodetector shows high detectivity (≈4.6 × 10¹⁰ Jones) and a good responsivity of 3.8 µA W⁻¹, due to the alternating current photovoltaic effect. The photodetector exhibits a rapid response with the rise and fall times of 35 and 48 ms, respectively, under self-biased conditions. Conductive atomic force microscopy demonstrates nanoscale charge transport and current generation, suggesting the possibility of fabricating a sub-nanometer (≈50 nm) sized photodetector. Results thus observed are attributed to the relative shift and realignment between quasi-Fermi levels under non-equilibrium conditions, caused by inhomogeneous charge carrier generation. The results presented in this study introduce a simple approach to enhance self-powered broadband photodetection while enabling high-performance for advanced optoelectronic applications in the future; these applications include smart security, optical communication, digital display, and sensing, amongst others.

中文翻译：

自供电和高性能交流光电探测器，以增强宽带光电探测

易于制造且操作方便的自供电宽带光电探测器在众多光电应用中非常受欢迎；然而，实现快速响应时间和高灵敏度仍然是其广泛使用的一项艰巨挑战。_{在这项研究中，通过在 MoO 3}上涂覆等离子 Au 纳米粒子 (NPs) 来制造一种自供电的高性能交流光电探测器。自供电光电探测器显示出高探测率 ( ≈ 4.6 × 10 ^{10 Jones) 和 3.8}µ A W ^-1 的良好响应度，由于交流电光伏效应。在自偏置条件下，光电探测器表现出快速响应，上升时间和下降时间分别为 35 毫秒和 48 毫秒。导电原子力显微镜显示纳米级电荷传输和电流产生，表明制造亚纳米（≈50 nm) 大小的光电探测器。因此观察到的结果归因于非平衡条件下准费米能级之间的相对位移和重新排列，这是由不均匀的电荷载流子产生引起的。本研究中提出的结果介绍了一种简单的方法来增强自供电宽带光电探测，同时为未来的先进光电应用提供高性能；这些应用包括智能安全、光通信、数字显示和传感等。

更新日期：2022-07-15

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