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Influence of Carbon in Metalorganic Chemical Vapor Deposition of Few-Layer WSe2 Thin Films

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Abstract

Metalorganic chemical vapor deposition (MOCVD) is a promising technique to form large-area, uniform films of monolayer or few-layer transition metal dichalcogenide (TMD) thin films; however, unintentional carbon incorporation is a concern. In this work, we report the presence of a defective graphene layer that forms simultaneously during MOCVD growth of tungsten diselenide (WSe2) on sapphire at high growth temperature and high Se:W ratio when using tungsten hexacarbonyl (W(CO)6) and dimethyl selenide ((CH3)2Se, DMSe) as precursors. The graphene layer alters the surface energy of the substrate reducing the lateral growth and coalescence of WSe2 domains. The use of hydrogen selenide (H2Se) instead of DMSe eliminates the defective graphene layer enabling coalesced monolayer and few-layer WSe2 films.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, 16802, USA

    Xiaotian Zhang, Zakaria Y. Al Balushi, Fu Zhang, Tanushree H. Choudhury, Sarah M. Eichfeld,  Nasim Alem, Thomas N. Jackson, Joshua A. Robinson & Joan M. Redwing

  2. Center for 2-Dimensional and Layered Materials, Materials Research Institute, The Pennsylvania State University, University Park, PA, 16802, USA

    Sarah M. Eichfeld,  Nasim Alem, Joshua A. Robinson & Joan M. Redwing

  3. Department of Electrical Engineering, The Pennsylvania State University, University Park, PA, 16802, USA

    Thomas N. Jackson & Joan M. Redwing

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  1. Xiaotian Zhang
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  2. Zakaria Y. Al Balushi
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  3. Fu Zhang
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  4. Tanushree H. Choudhury
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  5. Sarah M. Eichfeld
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  9. Joan M. Redwing
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Correspondence to Joan M. Redwing.

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Zhang, X., Al Balushi, Z.Y., Zhang, F. et al. Influence of Carbon in Metalorganic Chemical Vapor Deposition of Few-Layer WSe2 Thin Films. J. Electron. Mater. 45, 6273–6279 (2016). https://doi.org/10.1007/s11664-016-5033-0

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  • DOI: https://doi.org/10.1007/s11664-016-5033-0

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