Manganese Doping of Monolayer MoS2: The Substrate Is Critical

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• 作者：Kehao Zhang ; Simin Feng ; Junjie Wang ; Angelica Azcatl ; Ning Lu ; Rafik Addou ; Nan Wang ; Chanjing Zhou ; Jordan Lerach ; Vincent Bojan ; Moon J. Kim ; Long-Qing Chen ; Robert M. Wallace ; Mauricio Terrones ; Jun Zhu ; Joshua A. Robinson
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：October 14, 2015
• 年：2015
• 卷：15
• 期：10
• 页码：6586-6591
• 全文大小：495K
• ISSN：1530-6992

文摘

Substitutional doping of transition metal dichalcogenides (TMDs) may provide routes to achieving tunable p鈥搉 junctions, bandgaps, chemical sensitivity, and magnetism in these materials. In this study, we demonstrate in situ doping of monolayer molybdenum disulfide (MoS₂) with manganese (Mn) via vapor phase deposition techniques. Successful incorporation of Mn in MoS₂ leads to modifications of the band structure as evidenced by photoluminescence and X-ray photoelectron spectroscopy, but this is heavily dependent on the choice of substrate. We show that inert substrates (i.e., graphene) permit the incorporation of several percent Mn in MoS₂, while substrates with reactive surface terminations (i.e., SiO₂ and sapphire) preclude Mn incorporation and merely lead to defective MoS₂. The results presented here demonstrate that tailoring the substrate surface could be the most significant factor in substitutional doping of TMDs with non-TMD elements.