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High-performing visible-blind photodetectors based on SnO2/CuO nanoheterojunctions

机译:基于SnO2 / CuO纳米异质结的高性能可见盲光电探测器

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摘要

We report on the significant performance enhancement of SnO2 thin film ultraviolet (UV) photodetectors (PDs) through incorporation of CuO/SnO2 p-n nanoscale heterojunctions. The nanoheterojunctions are self-assembled by sputtering Cu clusters that oxidize in ambient to form CuO. We attribute the performance improvements to enhanced UV absorption, demonstrated both experimentally and using optical simulations, and electron transfer facilitated by the nanoheterojunctions. The peak responsivity of the PDs at a bias of 0.2 V improved from 1.9 A/W in a SnO2-only device to 10.3 A/W after CuO deposition. The wavelength-dependent photocurrent-to-dark current ratio was estimated to be ~ 592 for the CuO/SnO2 PD at 290 nm. The morphology, distribution of nanoparticles, and optical properties of the CuO/SnO2 heterostructured thin films are also investigated.
机译:我们报告了通过合并CuO / SnO2 p-n纳米异质结,SnO2薄膜紫外(UV)光电探测器(PD)的显着性能增强。纳米异质结通过溅射在环境中氧化形成CuO的Cu团簇而自组装。我们将性能的提高归功于增强的紫外线吸收,无论是通过实验还是使用光学模拟进行了证明,纳米异质结促进了电子转移。在0.2 V偏压下,PD的峰值响应率从仅SnO2器件中的1.9 A / W提高到CuO沉积后的10.3 A / W。对于290 nm处的CuO / SnO2 PD,估计波长相关的光电流与暗电流之比约为592。还研究了CuO / SnO2异质结构薄膜的形貌,纳米颗粒分布和光学性质。

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