Origin of the slow photoresponse in an individual sol-gel synthesized ZnO nanowire

Seung Eon Ahn, Hyun Jin Ji, Kanghyun Kim, Gyu Tae Kim, Chang Hyun Bae, Seung Min Park, Yong Kwan Kim, Jeong Sook Ha

Research output: Contribution to journalArticle

150 Citations (Scopus)

Abstract

Photocurrent of a single ZnO nanowire synthesized by a sol-gel route was investigated. In vacuum, the dark current was bigger but the photoresponse was slower than that in air, attributed to the release of the available charge carriers by the desorption of water molecules and the decrease of the exchange rates of molecular ions. Under the steady radiation of the ultraviolet light (λ=325 nm), a gradual decrease of the photocurrent was noticeable, which can be explained in terms of the annihilation of the carriers by the replacement of hydroxyl groups (OH-) by O2-, resulting in the decrease of charge carriers.

Original languageEnglish
Article number153106
JournalApplied Physics Letters
Volume90
Issue number15
DOIs
Publication statusPublished - 2007

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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