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TitleStrong light-matter interactions in heterostructures of atomically thin films
Author(s)Britnell, Líam
Ribeiro, R. M.
Eckmann, A.
Jalil, R.
Belle, B. D.
Mishchenko, A.
Kim, Y.-J.
Gorbachev, R. V.
Georgiou, T.
Morozov, S. V.
Grigorenko, A. N.
Geim, A. K.
Casiraghi, C.
Castro Neto, A. H.
Novoselov, K. S.
Issue date13-Jun-2013
PublisherAmerican Association for the Advancement of Science
CitationScience 340, 1311 (2013)
Abstract(s)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 utilizing semiconducting transition metal dichalcogenides (TMDC)/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 photo-responsivity above 0.1 A/W (corresponding to an external quantum efficiency of above 30%).
Publisher version
AccessOpen access
Appears in Collections:CDF - CEP - Artigos/Papers (with refereeing)

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