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High-performance self-powered ultraviolet photodetectors based on mixed-dimensional heterostructure arrays formed from NiO nanosheets and TiO2 nanorods

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Abstract

The morphology and geometry of semiconductors will affect the photoresponse performance of mixed-dimensional heterojunction photodetectors (PDs). Self-powered UV PDs based on mixed-dimensional heterostructure arrays are formed from two-dimensional NiO nanosheet arrays and one-dimensional TiO2 nanorod arrays. The Fermi level position and carrier concentration of the NiO nanosheets can be adjusted by the thickness of each layer and film. The enhanced built-in potential field of the NiO/TiO2 interface decreases the charge transfer resistance and the appreciated carrier transfer path improves the photogenerated carrier separation and transfer ability without external bias. The self-powered NiO/TiO2 heterojunction device demonstrates a large responsivity of 0.86 A W−1, a high detection sensitivity of 1.6 × 1013 Jones and a fast photoresponse time of 3 ms under weak UV light illumination.

Graphical abstract: High-performance self-powered ultraviolet photodetectors based on mixed-dimensional heterostructure arrays formed from NiO nanosheets and TiO2 nanorods

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Supplementary files

Article information


Submitted
21 Apr 2020
Accepted
14 Jun 2020
First published
15 Jun 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

High-performance self-powered ultraviolet photodetectors based on mixed-dimensional heterostructure arrays formed from NiO nanosheets and TiO2 nanorods

R. Cao, J. Xu, S. Shi, J. Chen, D. Liu, Y. Bu, X. Zhang, S. Yin and L. Li, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/D0TC01956A

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