Journal
2D MATERIALS
Volume 2, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2053-1583/2/2/024007
Keywords
transition metal dichalcogenides; molecular beam epitaxy; molybdenum diselenide; graphene; layered materials
Categories
Funding
- Air Force Office of Scientific Research (AFOSR)
- National Science Foundation (NSF)
- Center for Low Energy Systems Technology (LEAST), one of the six centers of STARnet, a Semiconductor Research Corporation
- MARCO
- DARPA
- Sustainable Energy Initiative (SEI), part of the Center for Sustainable Energy at Notre Dame (ND Energy)
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1400432] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1523356] Funding Source: National Science Foundation
- Emerging Frontiers & Multidisciplinary Activities
- Directorate For Engineering [1433490] Funding Source: National Science Foundation
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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 (similar to 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.
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