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Fast-speed self-powered PEDOT: PSS/α-Ga2O3 nanorod array/FTO photodetector with solar-blind UV/visible dual-band photodetection |
| Ming-Ming Fan(范明明)†, Kang-Li Xu(许康丽), Ling Cao(曹铃), and Xiu-Yan Li(李秀燕) |
| College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China |
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Abstract The $\alpha $-Ga$_{2}$O$_{3}$ nanorod array is grown on FTO by hydrothermal and annealing processes. And a self-powered PEDOT:PSS/$\alpha $-Ga$_{2}$O$_{3}$ nanorod array/FTO (PGF) photodetector has been demonstrated by spin coating PEDOT:PSS on the $\alpha $-Ga$_{2}$O$_{3}$ nanorod array. Successfully, the PGF photodetector shows solar-blind UV/visible dual-band photodetection. Our device possesses comparable solar-blind UV responsivity (0.18 mA/W at 235 nm) and much faster response speed (0.102 s) than most of the reported self-powered $\alpha $-Ga$_{2}$O$_{3}$ nanorod array solar-blind UV photodetectors. And it presents the featured and distinguished visible band photoresponse with a response speed of 0.136 s at 540 nm. The response time is also much faster than the other non-self-powered $\beta $-Ga$_{2}$O$_{3 }$ DUV/visible dual-band photodetectors due to the fast-speed separation of photogenerated carries by the built-in electric field in the depletion regions of PEDOT:PSS/$\alpha $-Ga$_{2}$O$_{3}$ heterojunction. The results herein may prove a promising way to realize fast-speed self-powered $\alpha $-Ga$_{2}$O$_{3}$ photodetectors with solar-blind UV/visible dual-band photodetection by simple processes for the applications of multiple-target tracking, imaging, machine vision and communication.
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Received: 26 September 2021
Revised: 16 October 2021
Accepted manuscript online: 10 November 2021
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PACS:
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85.60.Dw
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(Photodiodes; phototransistors; photoresistors)
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73.40.Lq
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(Other semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions)
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78.56.-a
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(Photoconduction and photovoltaic effects)
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07.60.Rd
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(Visible and ultraviolet spectrometers)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61705155). |
Corresponding Authors:
Ming-Ming Fan
E-mail: fanmingming08@163.com
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Cite this article:
Ming-Ming Fan(范明明), Kang-Li Xu(许康丽), Ling Cao(曹铃), and Xiu-Yan Li(李秀燕) Fast-speed self-powered PEDOT: PSS/α-Ga2O3 nanorod array/FTO photodetector with solar-blind UV/visible dual-band photodetection 2022 Chin. Phys. B 31 048501
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