Considerations for Utilizing Sodium Chloride in Epitaxial Molybdenum Disulfide

• DOI: 10.1021/acsami.8b16374
• Publication Date: 2018-11-02T08:09:53Z
• Authors: Kehao Zhang; Brian M. Bersch; Fu Zhang; Natalie C. Briggs; Shruti Subramanian; Ke Xu; Mikhail Chubarov; Ke Wang; Jordan O. Lerach; Joan M. Redwing; Susan K. Fullerto...; Mauricio Terrones; Joshua A. Robinson
• Keywords: Molybdenum disulfide

The utilization of alkali salts, such as NaCl and KI, has enabled the successful growth large single domain fully coalesced polycrystalline two-dimensional (2D) transition-metal dichalcogenide layers. However, impact salts on photonic electronic properties is not established. In this work, we report alkali-free epitaxy MoS2 sapphire benchmark against alkali-assisted MoS2. This study demonstrates that although can dramatically increase size monolayer by 20 times, it also induce strong optical heterogeneities in as-grown, large-scale films. work elucidates lead to variation rates, loss epitaxy, high density nanoscale particles (4 ± 0.7/μm2). Such phenomena suggest atoms play an important role Mo S adatom mobility strongly influence 2D/sapphire interface during growth. Compared synthesis under same conditions, assisted results >1% tensile strain as-grown domains, which reduces photoluminescence ∼20× degrades transistor performance.