Journal
NANO LETTERS
Volume 11, Issue 11, Pages 4682-4687Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl202266h
Keywords
Graphene; positive photoconductance; negative photoconductance; persistent photoconductance; optoelectronics
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Funding
- Star Faculty [2010-0029653]
- International Research & Development Program [2011-00242]
- NRF of Korea [R31-2008-10029]
- MEST
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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.
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