Molecular beam epitaxial growth of MoSe2 on graphite, CaF2 and graphene

Suresh Vishwanath; Xinyu Liu; Sergei Rouvimov; Patrick C. Mende; Angelica Azcatl; Stephen McDonnell; Robert M. Wallace; Randall M. Feenstra; Jacek K. Furdyna; Debdeep Jena; Huili Grace Xing

Molecular beam epitaxial growth of MoSe2 on graphite, CaF2 and graphene

Materials Science 2014-12-19 v1

Authors: Suresh Vishwanath , Xinyu Liu , Sergei Rouvimov , Patrick C. Mende , Angelica Azcatl , Stephen McDonnell , Robert M. Wallace , Randall M. Feenstra , Jacek K. Furdyna , Debdeep Jena , Huili Grace Xing

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Abstract

We report the structural and optical properties of molecular beam epitaxy (MBE) grown 2-dimensional (2D) material molybdenum diselenide (MoSe2) on graphite, CaF2 and epitaxial graphene. Extensive characterizations reveal that 2H- MoSe2 grows by van-der-Waals epitaxy on all 3 substrates with a preferred crystallographic orientation and a Mo:Se ratio of 1:2. Photoluminescence at room temperature (~1.56 eV) is observed in monolayer MoSe2 on both CaF2 and epitaxial graphene. The band edge absorption is very sharp, <60 meV over 3 decades. Overcoming the observed small grains by promoting mobility of Mo atoms would make MBE a powerful technique to achieve high quality 2D materials and heterostructures.

Keywords

molecular beam epitaxy MoSe2 van der Waals epitaxy photoluminescence 2D materials

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@article{arxiv.1412.5728,
  title  = {Molecular beam epitaxial growth of MoSe2 on graphite, CaF2 and graphene},
  author = {Suresh Vishwanath and Xinyu Liu and Sergei Rouvimov and Patrick C. Mende and Angelica Azcatl and Stephen McDonnell and Robert M. Wallace and Randall M. Feenstra and Jacek K. Furdyna and Debdeep Jena and Huili Grace Xing},
  journal= {arXiv preprint arXiv:1412.5728},
  year   = {2014}
}

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5 Figures in main paper and 6 figures in supplementary information

Molecular beam epitaxial growth of MoSe2 on graphite, CaF2 and graphene

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