1 State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences(CAS), Changchun 130033, China; 2 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
Abstract The slower response speed is the main problem in the application of ZnO quantum dots (QDs) photodetector, which has been commonly attributed to the presence of excess oxygen vacancy defects and oxygen adsorption/desorption processes. However, the detailed mechanism is still not very clear. Herein, the properties of ZnO QDs and their photodetectors with different amounts of oxygen vacancy (VO) defects controlled by hydrogen peroxide (H2O2) solution treatment have been investigated. After H2O2 solution treatment, VO concentration of ZnO QDs decreased. The H2O2 solution-treated device has a higher photocurrent and a lower dark current. Meanwhile, with the increase in VO concentration of ZnO QDs, the response speed of the device has been improved due to the increase of oxygen adsorption/desorption rate. More interestingly, the response speed of the device became less sensitive to temperature and oxygen concentration with the increase of VO defects. The findings in this work clarify that the surface VO defects of ZnO QDs could enhance the photoresponse speed, which is helpful for sensor designing.
(Quantum well devices (quantum dots, quantum wires, etc.))
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 62074148, 61875194, 11727902, 12074372, 11774341, 11974344, 61975204, and 11804335), the Youth Innovation Promotion Association of the Chinese Academy of Sciences (Grant No. 2020225), the Open Project of the State Key Laboratory of Luminescence and Applications (Grant Nos. SKLA-2020-02 and SKLA-2020-06).
Hongyu Ma(马宏宇), Kewei Liu(刘可为), Zhen Cheng(程祯), Zhiyao Zheng(郑智遥), Yinzhe Liu(刘寅哲), Peixuan Zhang(张培宣), Xing Chen(陈星), Deming Liu(刘德明), Lei Liu(刘雷), and Dezhen Shen(申德振) Effect of surface oxygen vacancy defects on the performance of ZnO quantum dots ultraviolet photodetector 2021 Chin. Phys. B 30 087303
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