Mechanism of Fermi Level Pinning for Metal Contacts on Transition Metal Dichalcogenides and Their Interface Thermal Stability

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dc.contributor.advisorWallace, Robert
dc.contributor.advisorFrensley , William
dc.contributor.committeeMemberFischetti, Massimo V.
dc.contributor.committeeMemberYoung, Chadwin D.
dc.contributor.committeeMemberKim, Jiyoung
dc.contributor.committeeMemberLv, Bing
dc.creatorWang, Xinglu
dc.date.accessioned2024-03-13T21:26:13Z
dc.date.available2024-03-13T21:26:13Z
dc.date.created2022-12
dc.date.issuedDecember 2022
dc.date.submittedDecember 2022
dc.date.updated2024-03-13T21:26:14Z
dc.description.abstractTransition metal dichalcogenides (TMDs) have demonstrated immense potential for application in state-of-the-art electronic, optoelectronic, and spintronic devices because of their outstanding electronic, optical, mechanical, and magnetic properties. However, the failure of tuning the Schottky barrier height by the work function of metal contacts strongly limits the efficiency of carrier injection and hence the electronic performance of TMD-based devices. This dissertation focuses on the interface between covalent and van der Waals metal contacts and TMDs to study the origin and mechanism of Fermi level pinning. Firstly, the interface chemistry and band alignment of Ni and Ag contacts on MoS2 is studied. Then the mechanism of Fermi level pinning of metal contacts on other Mo- and W-based TMDs are uncovered by considering interface chemistry, band alignment, defects and impurities of W-TMDs, contact metal adsorption mechanism and the resultant electronic structure. Also, the thermal stability of Ni/MoS2 systems is investigated in the aspects of interface chemistry, elemental diffusion, and band alignment.
dc.format.mimetypeapplication/pdf
dc.identifier.uri
dc.identifier.urihttps://hdl.handle.net/10735.1/10049
dc.language.isoen
dc.subjectEngineering, Materials Science
dc.titleMechanism of Fermi Level Pinning for Metal Contacts on Transition Metal Dichalcogenides and Their Interface Thermal Stability
dc.typeThesis
dc.type.materialtext
local.embargo.lift2023-12-01
local.embargo.terms2023-12-01
thesis.degree.collegeSchool of Engineering and Computer Science
thesis.degree.departmentMaterials Science and Engineering
thesis.degree.grantorThe University of Texas at Dallas
thesis.degree.namePHD

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