Dual wavelength (ultraviolet and green) photodetectors using solution processed zinc oxide nanoparticles

Ibrahem, M.A., Verrelli, E., Lai, K.T., Kyriakou, G., Lee, A.F., Isaacs, M.A., Cheng, F. and O’Neill, M. ORCID: 0000-0002-0232-5250, 2017. Dual wavelength (ultraviolet and green) photodetectors using solution processed zinc oxide nanoparticles. ACS Applied Materials & Interfaces, 9 (42), pp. 36971-36979. ISSN 1944-8244

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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 sha llow 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 form ation 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.

Item Type: Journal article
Publication Title: ACS Applied Materials & Interfaces
Creators: Ibrahem, M.A., Verrelli, E., Lai, K.T., Kyriakou, G., Lee, A.F., Isaacs, M.A., Cheng, F. and O’Neill, M.
Publisher: American Chemical Society
Date: 2017
Volume: 9
Number: 42
ISSN: 1944-8244
Identifiers:
NumberType
10.1021/acsami.7b08092DOI
Divisions: Schools > School of Science and Technology
Depositing User: Linda Sullivan
Date Added: 27 Oct 2017 14:49
Last Modified: 27 Oct 2017 14:49
URI: http://irep.ntu.ac.uk/id/eprint/31904

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