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Research Article

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

Haining Chong1,2Guodong Wei2Huilin Hou2Huijun Yang1Minghui Shang2Fengmei Gao2Weiyou Yang2( )Guozhen Shen3( )
Research Institute of Surface EngineeringTaiyuan University of TechnologyTaiyuan030024China
School of MaterialsNingbo University of TechnologyNingbo315016China
State Key Laboratory for Superlattices and MicrostructuresInstitute of Semiconductors Chinese Academy of SciencesBeijing100083China
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Abstract

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.

Nano Research
Pages 2822-2832
Cite this article:
Chong H, Wei G, Hou H, et al. High-performance solar-blind ultraviolet photodetector based on electrospun TiO2-ZnTiO3 heterojunction nanowires. Nano Research, 2015, 8(9): 2822-2832. https://doi.org/10.1007/s12274-015-0787-x

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Received: 21 January 2015
Revised: 09 April 2015
Accepted: 11 April 2015
Published: 04 July 2015
© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2015
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