摘要
采用一步水热法合成了不同质量分数的Bi_(2)O_(2)Se/TiO_(2)异质结构,对其进行了X射线衍射、扫描电子显微镜和透射电子显微镜表征,并基于Bi_(2)O_(2)Se/TiO_(2)异质结制备了紫外探测器。实验结果表明:在365 nm紫外光的照射下,Bi_(2)O_(2)Se的质量分数为60%时,Bi_(2)O_(2)Se/TiO_(2)异质结探测器的光电探测性能最好,光电流高于Bi_(2)O_(2)Se探测器,是TiO_(2)探测器的7倍;响应时间约为30 ms,是TiO_(2)探测器的1/6。Bi_(2)O_(2)Se/TiO_(2)异质结探测器的响应度和探测率分别为10^(-3) A/W、1.08×10^(7) cm·Hz^(1/2)/W,均比TiO_(2)探测器高一个数量级,原因是Bi_(2)O_(2)Se与TiO_(2)复合形成的异质结促进了光生电子和空穴的分离。
In this paper,Bi_(2)O_(2)Se/TiO_(2) heterostructures different mass fractions were synthesized by onestep hydrothermal method and characterized by Xray diffraction,scanning electron microscopy and transmission electron microscopy,and the ultraviolet detector based on Bi_(2)O_(2)Se/TiO_(2) heterojunction was prepared.The experimental results show that the photodetection performance of Bi_(2)O_(2)Se/TiO_(2) heterojunction detector is the best when the mass fraction of Bi_(2)O_(2)Se is 60%under 365 nm ultraviolet light.The photocurrent of Bi_(2)O_(2)Se/TiO_(2) heterojunction is 7 times that of TiO_(2) detector and higher than that of Bi_(2)O_(2)Se detector.The response time is about 30 ms,which is 1/6 of that of TiO_(2) detector.The responsivity and detectivity are 10^(−3) A/W and 1.08×10^(7) cm·Hz^(1/2)/W,respectively,which are also one order of magnitude higher than that of TiO_(2) detector.This is mainly because the heterojunction formed by the combination of Bi_(2)O_(2)Se and TiO_(2) promotes the separation of photogenerated electrons and holes.
作者
张翔宇
陈雨田
曾值
张冰珂
赵晨晨
任帅
容萍
高世勇
王东博
矫淑杰
王金忠
Zhang Xiangyu;Chen Yutian;Zeng Zhi;Zhang Bingke;Zhao Chenchen;Ren Shuai;Rong Ping;Gao Shiyong;Wang Dongbo;Jiao Shujie;Wang Jinzhong(School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,Heilongjiang,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2022年第11期167-172,共6页
Laser & Optoelectronics Progress
基金
国家重点研发计划(2019YFA0705201)。
