Metal oxide semiconductors have attracted growing attention due to their excellent electrical and optical properties, low-cost fabrication, and good stability, which grant them great application potential in photodetectors (PDs). However, broadband photoelectrochemical (PEC)-type PDs based on metal oxide semiconductors are deficient. In this work, we synthesized two-dimensional (2D) CuO nanosheets (NSs) by annealing Cu-based metal–organic frameworks (Cu-MOFs) and first demonstrated broadband PEC PDs based on 2D CuO NSs. The thicknesses of 2D CuO NSs are 2–6 nm. 2D CuO PEC PDs show a broadband photoresponse from 365 to 850 nm with a responsivity of 2.7 mA/W and a response time of 60/400 ms, which surpass most 2D material-based PEC PDs. Moreover, CuO NSs PEC PDs exhibit outstanding multicycle stability and long-term stability for 1-month storage with negligible decay, exceeding all recently reported 2D material-based PEC PDs. These results endow 2D CuO NSs with great potential in underwater photodetection.

中文翻译：

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用于光电化学光电探测器的 CuO 纳米片

金属氧化物半导体由于其优异的电学和光学性能、低成本的制造和良好的稳定性而受到越来越多的关注，这赋予它们在光电探测器（PD）中的巨大应用潜力。然而，基于金属氧化物半导体的宽带光电化学 (PEC) 型 PD 存在不足。在这项工作中，我们通过退火 Cu 基金属有机骨架 (Cu-MOF) 合成了二维 (2D) CuO 纳米片 (NSs)，并首次展示了基于 2D CuO NSs 的宽带 PEC PD。二维 CuO NS 的厚度为 2–6 nm。二维 CuO PEC PD 表现出从 365 到 850 nm 的宽带光响应，响应率为 2.7 mA/W，响应时间为 60/400 ms，超过了大多数基于二维材料的 PEC PD。而且，CuO NSs PEC PD 表现出出色的多循环稳定性和 1 个月存储的长期稳定性，衰减可忽略不计，超过了最近报道的所有基于二维材料的 PEC PD。这些结果赋予二维 CuO NSs 在水下光电探测方面的巨大潜力。