Journal
NATURE NANOTECHNOLOGY
Volume 11, Issue 1, Pages 42-+Publisher
NATURE RESEARCH
DOI: 10.1038/NNANO.2015.227
Keywords
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Funding
- Natural Sciences and Engineering Research Council of Canada [PGSD3-426325-2012]
- Marie-Curie International Fellowship COFUND
- ICFOnest programme
- Fundacio Cellex Barcelona
- ERC Career integration grant (GRANOP) [294056]
- ERC starting grant (CarbonLight) [307806]
- Mineco grant [RYC-2012-12281, FIS2013-47161-P]
- EC under Graphene Flagship [CNECT-ICT-604391]
- 'la Caixa' Banking Foundation
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Two-dimensional crystals such as graphene and transitionmetal dichalcogenides(1) demonstrate a range of unique and complementary optoelectronic properties(2,3). Assembling different two-dimensional materials in vertical heterostructures(4) enables the combination of these properties in one device, thus creating multifunctional optoelectronic systems with superior performance. Here, we demonstrate that graphene/WSe2/graphene heterostructures ally the high photodetection efficiency of transition-metal dichalcogenides(5,6) with a pico-second photoresponse comparable to that of graphene(7-9), thereby optimizing both speed and efficiency in a single photo-detector. We follow the extraction of photoexcited carriers in these devices using time-resolved photocurrent measurements and demonstrate a photoresponse time as short as 5.5 ps, which we tune by applying a bias and by varying the transition-metal dichalcogenide layer thickness. Our study provides direct insight into the physical processes governing the detection speed and quantum efficiency of these van der Waals heterostuctures, such as out-of-plane carrier drift and recombination. The observation and understanding of ultrafast and efficient photodetection demonstrate the potential of hybrid transition-metal dichalcogenide-based heterostructures as a platform for future optoelectronic devices.
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