MgO/TiO2复合结构紫外光探测器的制备及其光探测性能探究  

Preparation of MgO/TiO2 composite for ultraviolet detector and study on its photodetective performance

作　　者：董雅楠 张秀娟 郑文姬 DONG Ya-nan;ZHANG Xiu-juan;ZHENG Wen-ji(School of Petroleum and Chemical Engineering,Dalian University of Technology,Panjin 124221,China)

机构地区：[1]大连理工大学石油与化学工程学院

出　　处：《现代化工》2020年第2期128-131,共4页Modern Chemical Industry

基　　金：国家自然科学基金青年基金(21506028)

摘　　要：为解决TiO2纳米颗粒紫外光探测器难以兼具高光响应度和快响应速率的问题,制备了MgO阻挡层/TiO2纳米颗粒复合结构的自供电紫外光探测器。其中,具有多分枝结构的TiO2纳米颗粒提供较大比表面积,吸收紫外光子产生大量电子-空穴对;而MgO阻挡层的主要作用是阻止电子和空穴复合,从而减少电子传输过程中的损失。该复合结构紫外光探测器具有自供电性能,且兼具高光响应度(0.76 A/W)和快响应速率(上升时间和恢复时间分别为2.5 s和8.1 s),与其他TiO2纳米结构紫外光探测器相比性能优异。Titanium oxide(TiO2)with a rutile structure,which possesses a band-gap of 3.02 e V at 300 K,is widely used for ultraviolet(UV)detector.However,the TiO2nanoparticles(NPs)based UV detectors are difficult to obtain high photoresponsivity and fast response speed at the same time.A self-powered UV detector composing of Mg O blocking layer/TiO2NPs is successfully fabricated.This Mg O/TiO2NPs based UV detector exhibits superior performance than most reported TiO2nanostructure based UV detectors.It shows simultaneously an excellent responsivity(0.76 A·W-1)and quick response speed(its rising time and decaying time are 2.5 s and 8.1 s,respectively).TiO2NPs with abundant branches can provide large specific surface area to absorb the massive electron hole pair generated by UV.Mg O ultrathin layer is fabricated on the surface of substrate directly,which can effectively reduce wastage and recombination between electrons and holes in the boundary.In addition,this Mg O/TiO2NPs UV detector shows significant selectivity of UV light.

关 键 词：纳米结构 复合材料 自供电 紫外光探测器 

分 类 号：TL814[核科学技术—核技术及应用]