期刊
NATURE NANOTECHNOLOGY
卷 8, 期 12, 页码 952-958出版社
NATURE RESEARCH
DOI: 10.1038/NNANO.2013.219
关键词
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资金
- National Science Foundation [DMR-0956171]
- Office of Naval Research [N00014-12-1-0745]
- National Research Foundation of Korea
- Korean Government (Ministry of Education, Science and Technology) [NRF-2011-351-c00034]
- Institute for Basic Science in Korea
- National Institutes of Health Director's New Innovator Award Program [1DP2OD007279]
- UCLA cross-disciplinary scholars in science and technology (CSST) programme
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0956171] Funding Source: National Science Foundation
- Ministry of Science, ICT & Future Planning, Republic of Korea [IBS EM1304] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Layered materials of graphene and MoS2, for example, have recently emerged as an exciting material system for future electronics and optoelectronics. Vertical integration of layered materials can enable the design of novel electronic and photonic devices. Here, we report highly efficient photocurrent generation from vertical heterostructures of layered materials. We show that vertically stacked graphene-MoS2-graphene and graphene-MoS2-metal junctions can be created with a broad junction area for efficient photon harvesting. The weak electrostatic screening effect of graphene allows the integration of single or dual gates under and/or above the vertical heterostructure to tune the band slope and photocurrent generation. We demonstrate that the amplitude and polarity of the photocurrent in the gated vertical heterostructures can be readily modulated by the electric field of an external gate to achieve a maximum external quantum efficiency of 55% and internal quantum efficiency up to 85%. Our study establishes a method to control photocarrier generation, separation and transport processes using an external electric field.
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