Comprehensive structural and optical characterization of MBE grown MoSe2 on graphite, CaF2 and graphene. (6th May 2015)

• Record Type: Journal Article
• Authors: Vishwanath, Suresh; Liu, Xinyu; Rouvimov, Sergei; Mende, Patrick C; Azcatl, Angelica; McDonnell, Stephen; Wallace, Robert M; Feenstra, Randall M; Furdyna, Jacek K; Jena, Debdeep; Grace Xing, Huili
• Is Part Of: 2D materials. Volume 2:Number 2(2015)
• Publication Date: 2015-05-06
• Subjects: transition metal dichalcogenides -- molecular beam epitaxy -- molybdenum diselenide -- graphene -- layered materials; Graphene -- Periodicals; Materials science -- Periodicals; Nanostructured materials -- Periodicals; 620.115
• DOI: 10.1088/2053-1583/2/2/024007
• Languages: English
• ISSNs: 2053-1583

Abstract

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.