Enhanced ultraviolet sensitivity of zinc oxide nanoparticle photoconductors by surface passivation

Zinc oxide nanoparticles were created by a top-down wet-chemical etching process and then coated with polyvinyl-alcohol (PVA), exhibiting sizes ranging from 10 to 120nm with an average size approximately 80nm. The PVA layer provides surface passivation of zinc oxide nanoparticles. As a result of PVA...

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Bibliographic Details
Published in:Optical materials 2011-01, Vol.33 (3), p.359-362
Main Authors: Qin, Liqiao, Shing, Christopher, Sawyer, Shayla, Dutta, Partha S.
Format: Article
Language:English
Subjects:
Nanocomposites
Nanoparticles
Nanostructure
Passivation
Photoconductors
Polyvinyl alcohols
Polyvinyl-alcohol (PVA)
Surface passivation
Ultraviolet
Ultraviolet (UV) photoconductor
Ultraviolet emission
Zinc oxide
Zinc oxide (ZnO) nanoparticles
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Summary:Zinc oxide nanoparticles were created by a top-down wet-chemical etching process and then coated with polyvinyl-alcohol (PVA), exhibiting sizes ranging from 10 to 120nm with an average size approximately 80nm. The PVA layer provides surface passivation of zinc oxide nanoparticles. As a result of PVA coating, enhancement in ultraviolet emission and suppression of parasitic green emission is observed. Photoconductors fabricated using the PVA coated zinc oxide nanoparticles exhibited a ratio of ultraviolet photo-generated current to dark current as high as 4.5×104, 5 times better than that of the devices fabricated using uncoated ZnO nanoparticles.
ISSN:0925-3467
1873-1252
DOI:10.1016/j.optmat.2010.09.020