期刊
JOURNAL OF APPLIED PHYSICS
卷 118, 期 10, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4930931
关键词
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资金
- Office of Naval Research [N00014-1310465]
- National Science Foundation [ECCS-0925532]
- InnovationWorks
We report photodetection properties of a graphene/oxide/silicon capacitor structure with a nanoscale vacuum channel. The photogenerated two-dimensional electron gas (2DEG) inversion charges at SiO2/Si interface are extracted out to air and transported along the void channel at low bias voltage (<5V). A monolayer graphene, placed on top of SiO2 and suspended on the void channel, is utilized as a photon-transparent counter-electrode to the 2DEG layer and a collector electrode for the out-of-plane transported electrons, respectively. The photocurrent extracted through a void channel reveals high responsivity (1.0 A/W at 633 nm) as measured in a broad spectral range (325-1064 nm), especially demonstrating a UV-enhanced performance (0.43A/W responsivity and 384% internal quantum efficiency at 325 nm). The mechanisms underlying photocarrier generation, emission, and transport in a suspended-graphene/SiO2/Si structure are proposed. (C) 2015 AIP Publishing LLC.
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