Dual wavelength (ultraviolet and green) photodetectors using solution processed Zinc Oxide nanoparticles

Mohammed Ibrahem; Emanuele Verrelli; Khue Lai; Georgios Kyriakou; Adam Lee; Mark Isaacs; Fei Cheng; Mary O'Neill

doi:10.1021/acsami.7b08092

Dual wavelength (ultraviolet and green) photodetectors using solution processed Zinc Oxide nanoparticles

Mohammed Ibrahem, Emanuele Verrelli, Khue Lai, Georgios Kyriakou, Adam Lee, Mark Isaacs, Fei Cheng, Mary O'Neill

Research output: Contribution to journal › Article › peer-review

Abstract

Narrow-band photoconductivity with a spectral width of 0.16 eV is obtained from solution-processed colloidal ZnO nanocrystals beneath the band-edge at 2.25 eV. A new model involving electron transfer from deep defects to discrete shallow donors is introduced to explain the narrow spectrum and the exponential form of the current rise and decay transients. The defects are tentatively assigned to neutral oxygen vacancies. The photocurrent responsivity can be enhanced by storage in air and this correlates with the formation of carbonate surface species by capture of carbon dioxide during storage. This controllability is exploited to develop a low-cost and scalable photolithographic approach to pixelate photodetectors for applications such as object discrimination, sensing etc. The spectral response can be spatially patterned so that dual (ultraviolet and green) and single (ultraviolet only) wavelength detecting ZnO pixels can be produced on the same substrate. This presents a new sensor mode with applications in security or full colour imaging.

Original language	English
Pages (from-to)	36971–36979
Journal	ACS Applied Materials and Interfaces
Volume	9
Issue number	42
Early online date	26 Sept 2017
DOIs	https://doi.org/10.1021/acsami.7b08092
Publication status	Published - 25 Oct 2017

Bibliographical note

Copyright © 2017 American Chemical Society.
This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials and Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/abs/10.1021/acsami.7b08092.

Funding: Iraqi Ministry of Higher Education and Scientific Research, EPSRC grant EP/J001597/1.

Keywords

persistent photoconductivity
ZnO nanoparticles
photolithography
imaging photodetectors
defects

Access to Document

10.1021/acsami.7b08092

Dual Wavelength (Ultraviolet and Green) Photodetectors
Copyright © 2017 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials and Interfaces , copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/abs/10.1021/acsami.7b08092.
Accepted author manuscript, 1.14 MBLicence: CC BY-NC 3.0

Cite this

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title = "Dual wavelength (ultraviolet and green) photodetectors using solution processed Zinc Oxide nanoparticles",

abstract = "Narrow-band photoconductivity with a spectral width of 0.16 eV is obtained from solution-processed colloidal ZnO nanocrystals beneath the band-edge at 2.25 eV. A new model involving electron transfer from deep defects to discrete shallow donors is introduced to explain the narrow spectrum and the exponential form of the current rise and decay transients. The defects are tentatively assigned to neutral oxygen vacancies. The photocurrent responsivity can be enhanced by storage in air and this correlates with the formation of carbonate surface species by capture of carbon dioxide during storage. This controllability is exploited to develop a low-cost and scalable photolithographic approach to pixelate photodetectors for applications such as object discrimination, sensing etc. The spectral response can be spatially patterned so that dual (ultraviolet and green) and single (ultraviolet only) wavelength detecting ZnO pixels can be produced on the same substrate. This presents a new sensor mode with applications in security or full colour imaging. ",

keywords = "persistent photoconductivity , ZnO nanoparticles , photolithography , imaging photodetectors , defects",

author = "Mohammed Ibrahem and Emanuele Verrelli and Khue Lai and Georgios Kyriakou and Adam Lee and Mark Isaacs and Fei Cheng and Mary O'Neill",

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AU - Ibrahem, Mohammed

AU - Verrelli, Emanuele

AU - Lai, Khue

AU - Kyriakou, Georgios

AU - Lee, Adam

AU - Isaacs, Mark

AU - Cheng, Fei

AU - O'Neill, Mary

N1 - Copyright © 2017 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials and Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/abs/10.1021/acsami.7b08092. Funding: Iraqi Ministry of Higher Education and Scientific Research, EPSRC grant EP/J001597/1.

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Y1 - 2017/10/25

N2 - Narrow-band photoconductivity with a spectral width of 0.16 eV is obtained from solution-processed colloidal ZnO nanocrystals beneath the band-edge at 2.25 eV. A new model involving electron transfer from deep defects to discrete shallow donors is introduced to explain the narrow spectrum and the exponential form of the current rise and decay transients. The defects are tentatively assigned to neutral oxygen vacancies. The photocurrent responsivity can be enhanced by storage in air and this correlates with the formation of carbonate surface species by capture of carbon dioxide during storage. This controllability is exploited to develop a low-cost and scalable photolithographic approach to pixelate photodetectors for applications such as object discrimination, sensing etc. The spectral response can be spatially patterned so that dual (ultraviolet and green) and single (ultraviolet only) wavelength detecting ZnO pixels can be produced on the same substrate. This presents a new sensor mode with applications in security or full colour imaging.

AB - Narrow-band photoconductivity with a spectral width of 0.16 eV is obtained from solution-processed colloidal ZnO nanocrystals beneath the band-edge at 2.25 eV. A new model involving electron transfer from deep defects to discrete shallow donors is introduced to explain the narrow spectrum and the exponential form of the current rise and decay transients. The defects are tentatively assigned to neutral oxygen vacancies. The photocurrent responsivity can be enhanced by storage in air and this correlates with the formation of carbonate surface species by capture of carbon dioxide during storage. This controllability is exploited to develop a low-cost and scalable photolithographic approach to pixelate photodetectors for applications such as object discrimination, sensing etc. The spectral response can be spatially patterned so that dual (ultraviolet and green) and single (ultraviolet only) wavelength detecting ZnO pixels can be produced on the same substrate. This presents a new sensor mode with applications in security or full colour imaging.

KW - persistent photoconductivity

KW - ZnO nanoparticles

KW - photolithography

KW - imaging photodetectors

KW - defects

UR - http://doi.org/10.17036/researchdata.aston.ac.uk.00000296

UR - http://pubs.acs.org/doi/10.1021/acsami.7b08092

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DO - 10.1021/acsami.7b08092

M3 - Article

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JO - ACS Applied Materials and Interfaces

JF - ACS Applied Materials and Interfaces

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ER -

Dual wavelength (ultraviolet and green) photodetectors using solution processed Zinc Oxide nanoparticles

Abstract

Bibliographical note

Keywords

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