A self-powered ultraviolet photodetector with van der Waals Schottky junction based on TiO_(2) nanorod arrays/Au-modulated V2CTx MXene  

作　　者：Guangcan Luo Ziling Zhang Yabing Wang Qun Deng Shengtao Pan Tengfei Wang Qinghong Li Kaixiang Liu Pengfei Kong Jing Zhang Shengyun Luo Hong Lin 

机构地区：[1]Laboratory of Optoelectronic Materials and Devices,Key Laboratory of New Energy and Nanomaterials,School of Materials Science and Engineering,Guizhou Minzu University,Guiyang 550025,China [2]State Key Laboratory of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China [3]Research Center for Humanoid Sensing,Zhejiang Lab,Hangzhou 311100,China

出　　处：《Journal of Materials Science & Technology》2023年第25期83-91,共9页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foun-dation of China(NSFC,52072207);Guizhou Provincial Science and Technology Projects(Grant Nos.ZK[2023]YB145,ZK[2023]YB149,and ZK[2022]214);Science and Technology Project of Guizhou Provincial Education Department(Grant Nos.[2022]143,[2022]150,and KY[2022]173);Science and Technology Foundation of Guizhou Minzu University(Grant Nos.GZMUZK[2022]YB21 and GZ-MUSYS[2021]02)。

摘　　要：A self-powered ultraviolet photodetector(UV PD)with van der Waals(vdW)Schottky junction based on TiO_(2) nanorod arrays/Au-modulated V2 CTx MXene is reported.The Schottky junction enables the device to operate in self-powered mode.The dangling bond-free surface of V2 CTx MXene reduces the charge recombination at the junction interface.Meanwhile,V2 CTx MXene,with the work function(WF)increasing to 5.35 eV,forms a hole transport layer by contacting with Au electrode,which facilitates the carrier extraction.The electron lifetime in the device has prolonged to 8.95μs.As a result,the responsivity and detectivity of the PD have achieved 28 mA/W and 1.2×10^(11) cm Hz1/2/W(340 nm,65 mW/cm2,0 V),respectively.In addition,the presence of the Au electrode prevents the vanadium from coming into contact with oxygen and oxidizing,preserving the properties of the V2 CTx films.After 180 days of exposure to the atmosphere,the device performance remained at a particularly high level,indicating enhanced durability.This work points out an effective approach to modulate the properties of V2 CTx to obtain the high performance and stability of the UV PD.

关 键 词：TiO_(2)nanorod arrays V2CT MXene Work function Ultraviolet photodetectors Device stability 

分 类 号：TN60[电子电信—电路与系统] TP333[自动化与计算机技术—计算机系统结构]