Performance optimization of self-powered visible photodetectors based on Cu2O/electrolyte heterojunctions

doi:10.1088/1674-1056/abab7b

Abstract The performance of the self-powered photodetectors based on the Cu₂O/electrolyte heterojunctions is optimized by adjusting morphology and structure of the Cu₂O film. The Cu₂O film with a deposition time of 2000 s possesses a largest current density of 559.6 μ A/cm² under visible light illumination at zero bias, with a rising time of 5.2 ms and a recovering time of 9.0 ms. This optimized Cu₂O film has a highest responsivity of about 25.8 mA/W for visible light, and a negligible responsivity for UV light. The high crystallinity and excellent charge transfer property are responsible for the improved photodetection performance.

Keywords: self-powered visible photodetector Cu₂O photoelectrochemical

Received: 14 May 2020
Revised: 02 July 2020
Accepted manuscript online: 01 August 2020

PACS:	82.47.Jk	(Photoelectrochemical cells, photoelectrochromic and other hybrid electrochemical energy storage devices)
	85.60.Gz	(Photodetectors (including infrared and CCD detectors))
	81.20.Ka	(Chemical synthesis; combustion synthesis)
	72.40.+w	(Photoconduction and photovoltaic effects)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51602021) and the Fundamental Research Funds for the Central Universities, China (Grant No. FRF-TP-18-023A2).

Corresponding Authors: ^†Corresponding author. E-mail: baizhiming2008@126.com ^‡Corresponding author. E-mail: zhangyinghuaustb@sina.com

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Zhi-Ming Bai(白智明), Ying-Hua Zhang(张英华), Zhi-An Huang(黄志安), Yu-Kun Gao(高玉坤), and Jia Liu(刘佳) Performance optimization of self-powered visible photodetectors based on Cu₂O/electrolyte heterojunctions 2020 Chin. Phys. B 29 128202

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Performance optimization of self-powered visible photodetectors based on Cu2O/electrolyte heterojunctions

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Performance optimization of self-powered visible photodetectors based on Cu₂O/electrolyte heterojunctions