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High performance ultraviolet photodetectors based on ZnO nanoflakes/PVK heterojunction

机译:基于ZnO纳米片/ PVK异质结的高性能紫外光电探测器

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摘要

A high performance ultraviolet (UV) photodetector is receiving increasing attention due to its significant applications in fire warning, environmental monitoring, scientific research, astronomical observation, etc. The enhancement in performance of the UV photodetector has been impeded by lacking of a high-efficiency heterojunction in which UV photons can efficiently convert into charges. In this work, the high performance UV photodetectors have been realized by utilizing organic/inorganic heterojunctions based on a ZnO nanoflakes/poly (N-vinylcarbazole) hybrid. A transparent conducting polymer poly(3,4-ethylene-dioxythiophene):poly(styrenesulfonate)-coated quartz substrate is employed as the anode in replacement of the commonly ITO-coated glass in order to harvest shorter UV light. The devices show a lower dark current density, with a high responsivity (R) of 7.27 × 103A/W and a specific detectivity (D) of 6.20 × 1013 cm Hz1/2/W-1 at 2 V bias voltage in ambient environment (1.30 mW/cm2 at λ = 365 nm), resulting in the enhancements in R and D∗ by 49% and one order of magnitude, respectively. The study sheds light on developing high-performance, large scale-array, flexible UV detectors using the solution processable method.
机译:高性能紫外(UV)光电探测器由于在火灾预警,环境监测,科学研究,天文观测等方面的重要应用而受到越来越多的关注。由于缺乏高效能,阻碍了UV光电探测器性能的提高。紫外光子可以有效地转换成电荷的异质结。在这项工作中,通过利用基于ZnO纳米薄片/聚(N-乙烯基咔唑)杂化物的有机/无机异质结实现了高性能UV光电探测器。透明导电聚合物聚(3,4-乙烯-二氧噻吩):聚(苯乙烯磺酸盐)涂覆的石英基板被用作阳极,以代替通常的ITO涂覆的玻璃,以收集较短的紫外线。该器件显示出较低的暗电流密度,在环境电压为2 V的情况下,具有较高的响应度(R)为7.27×103A / W,比检测率(D)为6.20×1013 cm Hz1 / 2 / W-1(在λ= 365 nm时为1.30 mW / cm2),导致R和D *分别提高49%和一个数量级。该研究为使用可溶液处理的方法开发高性能,大型阵列,柔性紫外线检测器提供了启示。

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