Adsorbate doping of MoS2 and WSe2: the influence of Na and Co

Journal of Physics. Condensed Matter : an Institute of Physics Journal
Takashi KomesuPeter A Dowben

Abstract

We have investigated the influence of metal adsorbates (sodium and cobalt) on the occupied and unoccupied electronic structure of MoS2(0 0 0 1) and WSe2(0 0 0 1), through a combination of both photoemission and inverse photoemission. The electronic structure is rigidly shifted in both the WSe2 and MoS2 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 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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Citations

Jan 14, 2020·Advanced Materials·Se-Ho KimBaptiste Gault
Sep 13, 2018·Scientific Reports·Martik AghajanianJohannes Lischner
Aug 28, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Prescott E EvansPeter A Dowben
Nov 12, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Naseem Ud DinTalat S Rahman
Jun 25, 2021·ACS Applied Materials & Interfaces·Salvatore Ethan PanasciFilippo Giannazzo

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