articleNature CommunicationsJul 16, 2015GOLD OA

Determination of band alignment in the single-layer MoS2/WSe2 heterojunction

MCMing‐Hui ChiuCZChendong ZhangHSHung‐Wei ShiuCCChih‐Piao ChuuCCChang‐Hsiao Chen

Institute of Atomic and Molecular Sciences, Academia Sinica · Academia Sinica · +5 more institutions

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Indexed inarxivcrossrefdoajpubmed

Abstract

The emergence of two-dimensional electronic materials has stimulated proposals of novel electronic and photonic devices based on the heterostructures of transition metal dichalcogenides. Here we report the determination of band offsets in the heterostructures of transition metal dichalcogenides by using microbeam X-ray photoelectron spectroscopy and scanning tunnelling microscopy/spectroscopy. We determine a type-II alignment between MoS2 and WSe2 with a valence band offset value of 0.83 eV and a conduction band offset of 0.76 eV. First-principles calculations show that in this heterostructure with dissimilar chalcogen atoms, the electronic structures of WSe2 and MoS2 are well retained in their respective…

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Topics & keywords

Topics
Keywords
  • Heterojunction
  • Band offset
  • Chalcogen
  • X-ray photoelectron spectroscopy
  • Materials science
  • Valence (chemistry)
  • Electronic structure
  • Density functional theory
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