铁电效应调控的高性能p-NiO/i-BaTiO_(3)/n-ITO自供能紫外光电探测器  

High-performance p-NiO/i-BaTiO_(3)/n-ITO Self-driven UV Photodetectors Controlled by Ferroelectric Effect

作　　者：洪涵真 刘可为[1,2] 杨佳霖 陈星[1,2] 朱勇学[1] 程祯 李炳辉 刘雷 申德振[1,2] HONG Hanzhen;LIU Kewei;YANG Jialin;CHEN Xing;ZHU Yongxue;CHENG Zhen;LI Binghui;LIU Lei;SHEN Dezhen(State Key Laboratory of Luminescence and Applications,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Science,Beijing 100049,China)

机构地区：[1]中国科学院长春光学精密机械与物理研究所发光学及应用国家重点实验室,吉林长春130033 [2]中国科学院大学材料科学与光电工程研究中心,北京100049

出　　处：《发光学报》2024年第7期1173-1180,共8页Chinese Journal of Luminescence

基　　金：国家自然科学基金(62074148,61875194,12204474,11727902,12304111,12304112);中组部万人计划青年拔尖项目;中国科学院青年创新促进会(2020225);吉林省自然科学基金(20220101053JC);吉林省中青年科技创新创业卓越人才(团队)项目(20220508153RC);寒地建筑综合节能教育部重点实验室开放课题(JLJZHDKF022020007)。

摘　　要：近年来,自供能的紫外光电探测器由于无需任何外部偏压即可工作而成为军事和民用领域的研究热点。其中,钛酸钡(BTO)作为一种宽禁带铁电材料,拥有良好的铁电、压电和热电性能,可以产生本征自发极化场来分离光生载流子,从而实现自供能紫外光电探测。到目前为止,基于BTO的自供能光电探测器已经取得了巨大进展,然而,除了使用高质量的单晶材料外,所报道的器件往往表现出低响应度(10^(-8)~10^(-7) A·W^(-1))。本文利用低成本的射频溅射技术,制造了一种高性能的NiO/BTO/ITO p-i-n异质结构自供能紫外光电探测器。通过将BTO的铁电去极化场和p-i-n结的内建电场耦合,能有效提高光生载流子的分离和迁移。因此,该器件在正极化态下255 nm波长紫外光照射下的响应度可以达到3.4×10^(-5) A·W^(-1),远远高于其他已报道的基于非晶态和陶瓷BTO制备的紫外光电探测器。此外,该器件具有0.3 s/0.4 s的快速响应时间。本工作为提高BTO光电探测器的性能提供了一种新的策略。In recent years,self-driven ultraviolet(UV)photodetectors have become a central focus in both military and ci⁃vilian fields as they can operate without any external power supply.As a wide bandgap ferroelectric material,Barium titanate(BaTiO_(3),BTO)possesses good ferroelectric,piezoelectric,and pyroelectric properties,which could generate intrinsic spon⁃taneous polarization field to separate photogenerated carriers,resulting in a self-driven UV photoelectric detection.Till now,significant progress has been made on BTO-based self-driven photodetectors,however,the reported devices tended to exhibit low responsivity(10^(−8)−10^(−7) A·W^(-1))except the use of high-quality single crystalline materials.In this work,we have fabricat⁃ed a high-performance NiO/BTO/ITO p-i-n heterojunction structure self-driven UV photodetector using a low-cost RF sputter⁃ing technique.By coupling the ferroelectric depolarization field of BTO with the built-in field of p-i-n junction,the separation and migration of photogenerated carriers can be greatly promoted.Therefore,the responsivity at 255 nm of our device can reach to 3.4×10^(−5) A·W^(-1) under the poling-up state,which is much higher than that of reported UV photodetectors prepared from amorphous and ceramic BTO.In addition,our device exhibits a fast response speed of 0.3 s/0.4 s.The findings in this work provide a new strategy for improving the performance of BTO-based photodetectors.

关 键 词：钛酸钡 铁电极化 自供能 紫外光电探测器 p-i-n结 去极化场 

分 类 号：TN23[电子电信—物理电子学] O482.31[理学—固体物理]