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Nano Lett. 2011 Nov 9;11(11):4682-7. doi: 10.1021/nl202266h. Epub 2011 Oct 10.

Negative and positive persistent photoconductance in graphene.

Author information

1
SKKU Advanced Institute of Nanotechnology, WCU Department of Energy Science, Graphene Center, Sungkyunkwan University, Suwon 440-746, Republic of Korea.

Erratum in

  • Nano Lett. 2012 Dec 12;12(12):6505.

Abstract

Persistent photoconductance, a prolonged light-induced conducting behavior that lasts several hundred seconds, has been observed in semiconductors. Here we report persistent negative photoconductance and consecutive prominent persistent positive photoconductance in graphene. Unusually large yields of negative PC (34%) and positive PC (1652%) and remarkably long negative transient response time (several hours) were observed. Such high yields were reduced in multilayer graphene and were quenched under vacuum conditions. Two-dimensional metallic graphene strongly interacts with environment and/or substrate, causing this phenomenon, which is markedly different from that in three-dimensional semiconductors and nanoparticles.

PMID:
21972980
DOI:
10.1021/nl202266h
[Indexed for MEDLINE]

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