Adsorbate Doping of MoS2 and WSe2: The Influence of Na and Co

  • Authors:
    Iori Tanabe (U Nebraska/Lincoln), Takashi Komesu (U Nebraska/Lincoln), Peter Dowben (U Nebraska/Lincoln), Kenya Shimada (Hiroshima Univ.), Taichi Okuda (Hiroshima Univ.), Hideaki Iwasawa (Hiroshima Univ.), Eike Schwier (Hiroshima Univ.), Yohei Kojima (Hiroshima Univ.), Mingtian Zheng (Hiroshima Univ.), Koji Miyamoto (Hiroshima Univ.), Kazuaki Taguchi (Hiroshima Univ.)
    Publication ID:
    P090049
    Publication Type:
    Paper
    Received Date:
    6-Jan-2017
    Last Edit Date:
    28-Jun-2017
    Research:
    2398.001 (University of Nebraska/Lincoln)

Abstract

We have investigated the influence of metal adsorbates (sodium and cobalt) on the occupied and unoccupied electronic structure of MoS2(0001) and WSe2(0001), through a combination both photoemission and inverse photoemission. The electronic structure is rigidly shifted in both the WSe2 and MoS2 systems, with either Na or Co adsorption. Na adsorption is found to behave as an electron donor (n-type) in MoS2, while Co adsorption acts as an electron acceptor (p-type) in WSe2. The n-type transition metal dichalcogenide (MoS2) is easily doped more n-type with Na deposition while the p-type transition metal dichalcogenide (WSe2) 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.

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