Published in 2D Mater. 2, 024007 (2015).
Comprehensive structural and optical characterization of MBE grown
MoSe2 on graphite, CaF2 and graphene
Suresh Vishwanath1,2, Xinyu Liu3, Sergei Rouvimov1, Patrick C Mende4, Angelica Azcatl5,
Stephen McDonnell5, Robert M Wallace5, Randall M Feenstra4, Jacek K Furdyna3, Debdeep Jena1,2,6 and
Huili Grace Xing1,2,6
1Electrical Engineering Department, University of Notre Dame, Notre Dame, IN 46556, USA
2School of Electrical and Computer Engineering, Cornell University, Ithaca,NY14853, USA
3Physics Department, University of Notre Dame, Notre Dame, IN 46556, USA
4Physics Department, Carnegie Mellon University, Pittsburgh, PA 15213, USA
5Department of Materials Science and Engineering, University of Texas at Dallas, Richardson, TX 75083, USA
6Department of Materials Science and Engineering, Cornell University, Ithaca,NY 14853, USA
Abstract
We report the structural and optical properties of a 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
three 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 three decades. Overcoming the
observed small grains by promoting mobility of Mo adatoms would make MBE a powerful technique
to achieve high quality 2D materials and heterostructures.
Click here for preprint of paper on arXiv.
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