Negative and Positive Persistent Photoconductance in Graphene
Negative and Positive Persistent Photoconductance in Graphene
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DOI：
10.1021/nl202266h
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发表时间：
2011-11-01
期刊：
影响因子：
10.8
通讯作者：
Lee, Young Hee
中科院分区：
文献类型：
--
作者：
Biswas, Chandan;Guenes, Fethullah;Lee, Young Hee
持续光电导是一种持续数百秒的光诱导导电行为，已在半导体中观察到。在这里，我们报告了石墨烯中的持续负光电导和连续突出的持续正光电导。观察到异常大的阴性PC（34%）和阳性PC（1652%）产量和显着长的阴性瞬态响应时间（数小时）。这种高产率在多层石墨烯中降低，并在真空条件下淬灭。二维金属石墨烯与环境和/或基底强烈相互作用，导致这种现象，这与三维半导体和纳米颗粒中的现象明显不同。
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.