Adsorbate doping of MoS 2 and WSe 2 : the influence of Na and Co

We have investigated the influence of metal adsorbates (sodium and cobalt) on the occupied and unoccupied electronic structure of MoS (0 0 0 1) and WSe (0 0 0 1), through a combination of both photoemission and inverse photoemission. The electronic structure is rigidly shifted in both the WSe and Mo...

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Published in:Journal of physics. Condensed matter 2017-07, Vol.29 (28), p.285501
Main Authors: Komesu, Takashi, Le, Duy, Tanabe, Iori, Schwier, Eike F, Kojima, Yohei, Zheng, Mingtian, Taguchi, Kazuaki, Miyamoto, Koji, Okuda, Taichi, Iwasawa, Hideaki, Shimada, Kenya, Rahman, Talat S, Dowben, Peter A
Format: Article
Language:English
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Summary:We have investigated the influence of metal adsorbates (sodium and cobalt) on the occupied and unoccupied electronic structure of MoS (0 0 0 1) and WSe (0 0 0 1), through a combination of both photoemission and inverse photoemission. The electronic structure is rigidly shifted in both the WSe and MoS systems, with either Na or Co adsorption, generally as predicted by accompanying density functional theory based calculations. Na adsorption is found to behave as an electron donor (n-type) in MoS , while Co adsorption acts as an electron acceptor (p-type) in WSe . The n-type transition metal dichalcogenide (MoS ) is easily doped more n-type with Na deposition while the p-type transition metal dichalcogenide (WSe ) is easily doped more p-type with Co deposition. The binding energy shifts have some correlation with the work function differences between the metallic adlayer and the transition metal dichalcogenide substrate.
ISSN:0953-8984
1361-648X
DOI:10.1088/1361-648X/aa7482