Ag纳米线增强硒微米管/聚噻吩自驱动光电探测器性能  

Ag Nanowires Enhance Performance of Self-powered Photodetector Based on Selenium Microtube/Polythiophene

作　　者：陈荣鹏 冯仕亮 郑天旭 于平平 姜岩峰 CHEN Rong-peng;FENG Shi-liang;ZHENG Tian-xu;YU Ping-ping;JIANG Yan-feng(School of Internet of Things Engineering,Jiangnan University,Wuxi 214122,China)

机构地区：[1]江南大学物联网工程学院,江苏无锡214122

出　　处：《发光学报》2022年第8期1273-1280,共8页Chinese Journal of Luminescence

基　　金：国家自然科学基金(51802124);中国博士后科学基金(2019M651693)资助项目。

摘　　要：自驱动光电探测器能够满足现代光电器件对节能和轻质的需求,但复杂的工艺和较高的成本限制了其进一步发展。本文采用旋涂法将硒微米管(Se-MT)和聚噻吩(PEDOT)制备成Se-MT/PEDOT异质结,其器件在350~700 nm波长下具有良好的光响应,无偏置电压下的响应度为8 mA/W(500 nm)。为了提高器件的光响应度,利用银纳米线(Ag-NW)修饰异质结制备Se-MT/PEDOT/Ag-NW,增强异质结在紫外-可见光区的光吸收并提高器件的光电性能。与Se-MT/PEDOT器件对比,Se-MT/PEDOT/Ag-NW器件在350~700 nm波长下的光电流数值整体上升,特别是在0 V偏压500 nm光照下,器件的响应度提升至65 mA/W(增强800%),开关比增强400%达到552,上升和下降时间明显下降至15 ms和28 ms。这一结果表明Ag-NW改性有机/无机异质结的方法可以应用于高性能光电探测器的制备。Self-powered photodetectors can meet the demands of modern optoelectronic devices for energy conservation and lightweight,but the complex process and high cost limit their further devel⁃opment.In this work,Se-MT/PEDOT heterojunction has been prepared by spin-coating with selenium microtube(Se-MT)and polythiophene(PEDOT),which shows a good photoresponse at 350-700 nm and a responsivity of 8 mA/W at 500 nm without bias voltage.To enhance the responsivity,Se-MT/PEDOT/Ag-NW was prepared by adding silver nanowires(Ag-NW)on the surface of Se-MT/PEDOT heterojunction,enhancing the UV-Vis absorption to improve the photoelectric performance of the de⁃vice.Compared to the Se-MT/PEDOT,the Se-MT/PEDOT/Ag-NW device shows enhanced photocur⁃rent at the wavelength of 350-700 nm,especially under 500 nm illumination at zero bias,800%im⁃provement in responsivity of 65 mA/W,the on-off ratio up to 552 with 400%enhancement,obvious reduction in response time(rise/decay time of 15/28 ms).This result indicates that the Ag-NWs modification of organic/inorganic heterojunction can be applied to the preparation of high-perfor⁃mance photodetectors.

关 键 词：异质结 银纳米线 自驱动 光电探测器 

分 类 号：O482.31[理学—固体物理] TN304[理学—物理]