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      Measurement of the optical dielectric function of transition metal dichalcogenide monolayers: MoS2, MoSe2, WS2 and WSe2

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          Abstract

          We report a determination of the complex in-plane dielectric function of monolayers of four transition metal dichalcogenides: MoS2, MoSe2, WS2 and WSe2, for photon energies from 1.5 - 3 eV. The results were obtained from reflection spectra using a Kramers-Kronig constrained variational analysis. From the dielectric functions, we obtain the absolute absorbance of the monolayers. We also provide a comparison of the dielectric function for the monolayers with the corresponding bulk materials.

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          Progress, challenges, and opportunities in two-dimensional materials beyond graphene.

          Sheneve Z. Butler, Shawna M Hollen, Linyou Cao … (2013)
          Graphene's success has shown that it is possible to create stable, single and few-atom-thick layers of van der Waals materials, and also that these materials can exhibit fascinating and technologically useful properties. Here we review the state-of-the-art of 2D materials beyond graphene. Initially, we will outline the different chemical classes of 2D materials and discuss the various strategies to prepare single-layer, few-layer, and multilayer assembly materials in solution, on substrates, and on the wafer scale. Additionally, we present an experimental guide for identifying and characterizing single-layer-thick materials, as well as outlining emerging techniques that yield both local and global information. We describe the differences that occur in the electronic structure between the bulk and the single layer and discuss various methods of tuning their electronic properties by manipulating the surface. Finally, we highlight the properties and advantages of single-, few-, and many-layer 2D materials in field-effect transistors, spin- and valley-tronics, thermoelectrics, and topological insulators, among many other applications.
          Article 0 comments Cited 1172 times – based on 0 reviews     Review now
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            The transition metal dichalcogenides discussion and interpretation of the observed optical, electrical and structural properties

            J.A. Wilson, A.D. Yoffe (1969)
            Article 0 comments Cited 935 times – based on 0 reviews     Review now
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              Strong light-matter interactions in heterostructures of atomically thin films.

              L. Britnell, R. Ribeiro, A Eckmann … (2013)
              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%).
              Article 0 comments Cited 740 times – based on 0 reviews     Review now
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                Author and article information

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                Publication date Created: 2016-10-14
                Article
                DOI: 10.1103/PhysRevB.90.205422
                ArXiV ID: 1610.04671
                SO-VID: f56ad817-134f-4a95-9356-456f32f32c44
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                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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                Journal reference Phys. Rev. B 90, 205422 (2014)
                Categories cond-mat.mtrl-sci

                ScienceOpen disciplines: Condensed matter
                Data availability:
                ScienceOpen disciplines: Condensed matter

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