Persistent photoconductivity in ZnO nanostructures induced by surface oxygen vacancy

Z. G. Yin; X. W. Zhang; Z. Fu; X. L. Yang; J. L. Wu; G. S. Wu; L. Gong; Paul K. Chu

doi:10.1002/pssr.201105551

Persistent photoconductivity in ZnO nanostructures induced by surface oxygen vacancy

Z. G. Yin, X. W. Zhang, Z. Fu, X. L. Yang, J. L. Wu, G. S. Wu, L. Gong, Paul K. Chu

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

32 Citations (Scopus)

Abstract

ZnO nanowall networks grown on SiO ₂/Si substrate were found to exhibit persistent photoconductivity (PPC). The relaxation rate of the persistent photocurrent is enhanced by a higher oxygen level in the ambient suggesting that PPC is closely related to the ZnO surface. Surface modification with hydrogen peroxide can significantly reduce the PPC relaxation time, implying that surface oxygen deficiency is responsible for the effect. The transition between the neutral and the metastable singly ionized states of the surface oxygen vacancy is suggested to account for the phenomenon and it is supported by the temperature and wavelength dependence of the PPC. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Original language	English
Pages (from-to)	117-119
Journal	Physica Status Solidi - Rapid Research Letters
Volume	6
Issue number	3
DOIs	https://doi.org/10.1002/pssr.201105551
Publication status	Published - Mar 2012

Research Keywords

Nanostructures
Photoconductivity
Vacancies
ZnO

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title = "Persistent photoconductivity in ZnO nanostructures induced by surface oxygen vacancy",

abstract = "ZnO nanowall networks grown on SiO 2/Si substrate were found to exhibit persistent photoconductivity (PPC). The relaxation rate of the persistent photocurrent is enhanced by a higher oxygen level in the ambient suggesting that PPC is closely related to the ZnO surface. Surface modification with hydrogen peroxide can significantly reduce the PPC relaxation time, implying that surface oxygen deficiency is responsible for the effect. The transition between the neutral and the metastable singly ionized states of the surface oxygen vacancy is suggested to account for the phenomenon and it is supported by the temperature and wavelength dependence of the PPC. {\textcopyright} 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.",

keywords = "Nanostructures, Photoconductivity, Vacancies, ZnO",

author = "Yin, {Z. G.} and Zhang, {X. W.} and Z. Fu and Yang, {X. L.} and Wu, {J. L.} and Wu, {G. S.} and L. Gong and Chu, {Paul K.}",

year = "2012",

month = mar,

doi = "10.1002/pssr.201105551",

language = "English",

volume = "6",

pages = "117--119",

journal = "Physica Status Solidi - Rapid Research Letters",

issn = "1862-6254",

publisher = "Wiley-VCH Verlag GmbH",

number = "3",

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TY - JOUR

T1 - Persistent photoconductivity in ZnO nanostructures induced by surface oxygen vacancy

AU - Yin, Z. G.

AU - Zhang, X. W.

AU - Fu, Z.

AU - Yang, X. L.

AU - Wu, J. L.

AU - Wu, G. S.

AU - Gong, L.

AU - Chu, Paul K.

PY - 2012/3

Y1 - 2012/3

N2 - ZnO nanowall networks grown on SiO 2/Si substrate were found to exhibit persistent photoconductivity (PPC). The relaxation rate of the persistent photocurrent is enhanced by a higher oxygen level in the ambient suggesting that PPC is closely related to the ZnO surface. Surface modification with hydrogen peroxide can significantly reduce the PPC relaxation time, implying that surface oxygen deficiency is responsible for the effect. The transition between the neutral and the metastable singly ionized states of the surface oxygen vacancy is suggested to account for the phenomenon and it is supported by the temperature and wavelength dependence of the PPC. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

AB - ZnO nanowall networks grown on SiO 2/Si substrate were found to exhibit persistent photoconductivity (PPC). The relaxation rate of the persistent photocurrent is enhanced by a higher oxygen level in the ambient suggesting that PPC is closely related to the ZnO surface. Surface modification with hydrogen peroxide can significantly reduce the PPC relaxation time, implying that surface oxygen deficiency is responsible for the effect. The transition between the neutral and the metastable singly ionized states of the surface oxygen vacancy is suggested to account for the phenomenon and it is supported by the temperature and wavelength dependence of the PPC. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

KW - Nanostructures

KW - Photoconductivity

KW - Vacancies

KW - ZnO

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UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-84863121907&origin=recordpage

U2 - 10.1002/pssr.201105551

DO - 10.1002/pssr.201105551

M3 - RGC 21 - Publication in refereed journal

SN - 1862-6254

VL - 6

SP - 117

EP - 119

JO - Physica Status Solidi - Rapid Research Letters

JF - Physica Status Solidi - Rapid Research Letters

IS - 3

ER -

Persistent photoconductivity in ZnO nanostructures induced by surface oxygen vacancy

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