Scalable MoS2/graphene hetero-structures grown epitaxially on sapphire substrates for phototransistor applications

Hsuan An Chen, Wei Chan Chen, Hsu Sun, Chien-Chung Lin, Shih Yen Lin

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7 Scopus citations

Abstract

Bi-layer graphene is grown directly on sapphire substrates by using ethane as the precursor without the assistance of a metal catalyst. A growth model of graphene flake formation in the furnace, followed by a complete film growth is also proposed. Using the graphene/sapphire sample as the new substrate, scalable MoS2 films with good layer number controllability can be grown directly on the substrate. After fabricating the MoS2/graphene hetero-structures into bottom-gate photo-transistors, a Dirac point shift is observed for the device under the light irradiation condition, which is attributed to the extraction of photo-excited electrons in the MoS2 layer to the graphene channel. The photo-voltaic response observed for the photo-transistors may provide a potential application of the 2D material hetero-structure in thin-film solar cells.

Original languageEnglish
Article number025007
JournalSemiconductor Science and Technology
Volume33
Issue number2
DOIs
StatePublished - 12 Jan 2018

Keywords

  • 2D material hetero-structures
  • photo-transistors
  • van der Waals epitaxy

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