Molecular beam epitaxial growth of MoSe2 on graphite, CaF2 and graphene
Vishwanath, Suresh · Liu, Xinyu · Rouvimov, Sergei · Mende, Patrick C. · Azcatl, Angelica · McDonnell, Stephen · Wallace, Robert M. · Feenstra, Randall M. · Furdyna, Jacek K. · Jena, Debdeep · Xing, Huili Grace
Original · EN
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.
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