Solution-Processed Self-Powered Transparent Ultraviolet Photodetectors with Ultrafast Response Speed for High-Performance Communication System
Solution-Processed Self-Powered Transparent Ultraviolet Photodetectors with Ultrafast Response Speed for High-Performance Communication System
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DOI：
10.1002/adfm.201809013
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发表时间：
2019-05-16
影响因子：
19
通讯作者：
Wang, Hong
中科院分区：
文献类型：
--
作者：
Fang, Huajing;Zheng, Cheng;Wang, Hong
透明紫外（UV）光电探测器是下一代透明电子器件的重要组成部分。然而，目前的光电探测器通常具有相对较慢的响应速度和较高的驱动电压。在这里，所有的解决方案处理的紫外光探测器的报告，是方便地从环境友好和丰富的材料制备。紫外光探测器是由二氧化钛薄膜作为光敏层夹在两个不同的透明电极，形成不对称的肖特基结。由于光生电子-空穴对被内建电场自发分离，因此具有高光学透明度的光电探测器可以在零偏压下工作。所得的自供电光电探测器显示出对宽带UV光（200-400 nm）的高灵敏度。特别是，获得了高达44 ns的超快响应速度，代表了显着的改善，超过那些传统的透明光电探测器。此外，该光电探测器已成功地应用于紫外光通信系统作为自供电的信号接收机，为第一次。这项工作独特地结合了高光学透明度和自供电能力的紫外光探测器的特点，并将使广泛的光电应用。
Transparent ultraviolet (UV) photodetectors are an essential component of next-generation see-through electronics. However, the current photodetectors often suffer from relatively slow response speeds and high driving voltages. Here, all-solution-processed UV photodetectors are reported that are facilely prepared from environmentally friendly and abundant materials. The UV photodetectors are composed of a titanium dioxide thin film as the photosensitive layer sandwiched between two different transparent electrodes to form asymmetric Schottky junctions. The photodetector with high optical transparency can operate at zero bias because of spontaneous separation of photogenerated electron-hole pairs by the built-in electric field. The resulting self-powered photodetector displays high sensitivity to broadband UV light (200-400 nm). In particular, an ultrafast response speed up to 44 ns is obtained, representing a significant improvement over those of the conventional transparent photodetectors. Moreover, the photodetector has been successfully applied, for the first time, in a UV communication system as the self-powered signal receiver. This work uniquely combines the features of high optical transparency and self-power ability into UV photodetectors and would enable a broad range of optoelectronic applications.