High-performance solar-blind ultraviolet photodetector based on electrospun TiO2-ZnTiO3 heterojunction nano- wires  

作　　者：Haining Chong Guodong Wei Huilin Hou Huijun Yang Minghui Shang Fengmei Gao Weiyou Yang Guozhen Shen 

机构地区：[1]Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, China [2]School of Materials, Ningbo University of Technology, Ningbo 315016, China [3]State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China

出　　处：《Nano Research》2015年第9期2822-2832,共11页纳米研究（英文版）

摘　　要：High-performance solar-blind UV （ultraviolet） photodetectors （PDs） based on low-dimension semiconducting nanostructures with high sensitivity, excellent cycle stability, and the ability to operate in harsh environments are critical for solar observations, space communication, UV astronomy, and missile tracking. In this study, TiO2-ZnTiO3 heterojunction nanowire-based PDs are successfully developed and used to detect solar-blind UV light. A photoconductive analysis indicates that the fabricated PDs are sensitive to UV illumination, with high sensitivity, good stability, and high reproducibility. Further analysis indicates that the rich existence of grain boundaries within the TiO2-ZnTiO3 nanowire can greatly decrease the dark current and recombination of the electron-hole pairs and thereby significantly increase the device＇s photosensitivity, spectra responsivity （1.1 ～ 106）, and external quantum efficiency （4.3 ～ 108 %）. Moreover, the PDs exhibit good photodetective performance with fast photoresponse and recovery and excellent thermal stability at temperatures as high as 175 ℃. According to these results, TiO2-ZnTiO3 heterojunction nanowires exhibit great potential for applications in high-performance optical electronics and PDs, particularly next-generation photodetectors with the ability to operate in harsh environments.

关 键 词：photodetector solar blind heterojunction photosensor high temperature 

分 类 号：O[理学]