Journal
SCIENCE
Volume 340, Issue 6138, Pages 1311-1314Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1235547
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Funding
- Royal Society
- European Research Council
- U.S. Army
- EPSRC
- European Science Foundation (ESF) under the EUROCORES Programme EuroGRAPHENE (GOSPEL)
- Swiss National Science Foundation
- National Research Foundation (NRF) of Singapore through NRF-CRP [R-144-000-295-281]
- Global Research Laboratory (GRL) Program of the Ministry of Education, Science and Technology, Korea [2011-0021972]
- Portuguese FCT [SFRH/BSAB/1249/2012]
- EPSRC [EP/K005014/1] Funding Source: UKRI
- National Research Foundation of Korea [2011-0021972] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Fundação para a Ciência e a Tecnologia [SFRH/BSAB/1249/2012] Funding Source: FCT
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The isolation of various two-dimensional (2D) materials, and the possibility to combine them in vertical stacks, has created a new paradigm in materials science: heterostructures based on 2D crystals. Such a concept has already proven fruitful for a number of electronic applications in the area of ultrathin and flexible devices. Here, we expand the range of such structures to photoactive ones by using semiconducting transition metal dichalcogenides (TMDCs)/graphene stacks. Van Hove singularities in the electronic density of states of TMDC guarantees enhanced light-matter interactions, leading to enhanced photon absorption and electron-hole creation (which are collected in transparent graphene electrodes). This allows development of extremely efficient flexible photovoltaic devices with photoresponsivity above 0.1 ampere per watt (corresponding to an external quantum efficiency of above 30%).
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