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

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• 作者：Haining Chong ; Guodong Wei ; Huilin Hou ; Huijun Yang ; Minghui Shang…
• 关键词：photodetector ; solar blind ; heterojunction ; photosensor ; high temperature
• 刊名：Nano Research
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：8
• 期：9
• 页码：2822-2832
• 全文大小：2,337 KB
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• 作者单位：Haining Chong (1) (2)
  Guodong Wei (2)
  Huilin Hou (2)
  Huijun Yang (1)
  Minghui Shang (2)
  Fengmei Gao (2)
  Weiyou Yang (2)
  Guozhen Shen (3)
  
  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
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chinese Library of Science
  Chemistry
  Nanotechnology
  
• 出版者：Tsinghua University Press, co-published with Springer-Verlag GmbH
• ISSN：1998-0000

文摘

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 °C. 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.