UV enhanced white-light response based on p-Si/n-ZnO nanorod heterojunction photosensor

[Display omitted] •Fast response p-Si/ZnO nanorods-based photosensor.•Dual response to light wavelength regime.•UV photons enhances white-light response.•The mechanism of an enhancement in WL response is proposed. Two-regime photosensor has been fabricated from p-n junction between p-Si and n-ZnO na...

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Bibliographic Details
Published in:Sensors and actuators. A. Physical. 2019-09, Vol.296, p.324-330
Main Authors: Thongma, Sattra, Tantisantisom, Kittipong, Grisdanurak, Nurak, Boonkoom, Thitikorn
Format: Article
Language:English
Subjects:
Conduction bands
Heterojunctions
Hydrothermal synthesis
Light irradiation
Luminescence
Nanorods
P-n junctions
Photocatalysis
Photoelectric effect
Photoelectric emission
Photoluminescence
Photoresponse enhancement
Recovery time
Silicon
Silicon substrates
Ultraviolet
Ultraviolet radiation
White light
Zinc oxide
Zinc oxides
ZnO nanorod
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Summary:[Display omitted] •Fast response p-Si/ZnO nanorods-based photosensor.•Dual response to light wavelength regime.•UV photons enhances white-light response.•The mechanism of an enhancement in WL response is proposed. Two-regime photosensor has been fabricated from p-n junction between p-Si and n-ZnO nanorods. The junction is obtained by simply grown vertically-aligned ZnO nanorods on silicon substrate via hydrothermal method. As expected, the device response to visible and UV spectrum due to the band gap of silicon and ZnO, respectively. However, it is found that photoresponse to visible light can be enhanced under UV activation. Detailed mechanism behind the phenomena is proposed along with the photoluminescence results of defect states in ZnO nanorods. The trapped electrons from UV stimulation could be excited to conduction band by white light and contributed to the increase of the photocurrent of the device under white-light irradiation. This low-temperature solution growth ZnO nanorod-based UV–vis photosensor also presents reproducible results and fast recovery time.
ISSN:0924-4247
1873-3069
DOI:10.1016/j.sna.2019.07.038