Strong light-matter interactions in heterostructures of atomically thin films.

L Britnell, R M Ribeiro, A Eckmann, R Jalil, B D Belle, A Mishchenko, Y-J Kim, R V Gorbachev, T Georgiou, S V Morozov, A N Grigorenko, A K Geim, C Casiraghi, A H {Castro Neto}, K S Novoselov

    Research output: Contribution to journalArticlepeer-review

    Abstract

    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{\%}).
    Original languageEnglish
    Pages (from-to)1311-4
    Number of pages1306
    JournalScience (New York, N.Y.)
    Volume340
    Issue number6138
    DOIs
    Publication statusPublished - Jun 2013

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