Dissertations, Theses, and Capstone Projects
Date of Degree
9-2024
Document Type
Thesis
Degree Name
M.S.
Program
Nanoscience
Advisor
Maya Narayanan Nair
Committee Members
Gabriele Grosso
Tai-De Li
Subject Categories
Atomic, Molecular and Optical Physics | Inorganic Chemistry | Materials Chemistry | Other Physics
Keywords
Semiconductor, Transition metal, Doping, Magnetism, Holes, Spintronics
Abstract
Magnetic semiconductors are a prerequisite for spintronic devices but their ferromagnetism disappears at room-temperature hindering application in room temperature electronic devices. Enormous research has been conducted on the room-temperature ferromagnetic order in monolayer form of bulk van der Waals materials but the few layer system has not been extensively explored.
Doping is an effective approach to modulate the structural, electronic and magnetic properties of two-dimensional (2D) Transition metal dichalcogenides (TMDs) and expand their application. The effect of vanadium dopant on structural, electronic and magnetic properties of Tungsten Diselenide (WSe2) was studied by X-ray Photoelectron Spectroscopy (XPS), Atomic Force Microscopy (AFM), Magnetic Force Microscopy (MFM), Raman analysis, Energy-dispersive X-ray spectroscopy (EDX) and nitrogen-vacancy (NV) magnetometry.
The substitutional doping of vanadium atom into WSe2 lattice leads to construction of p-type TMD semiconductor. The successful doping of vanadium atoms in WSe2 bulk crystal and the p-type nature of the V-doped WSe2 crystal has been confirmed by XPS. The Raman analysis exhibited red-shift and verified the p-doping effect of vanadium dopant on WSe2.
The room-temperature ferromagnetic domains in few-layer V-doped WSe2 have been demonstrated via magnetic force microscopy (MFM). Hence, incorporation of magnetic dopant is a promising approach for fabrication of spintronic devices without applying an external magnetic field.
Vanadium dopant atoms simultaneously endow TMDs with holes and magnetism and broaden their technological applications by creating a p-type air-stable room temperature 2D few layer magnet.
Recommended Citation
Ashraf, Qudsia, "Structural, Electronic and Magnetic Properties of Vanadium Doped Transition Metal Dichalcogenides (TMDs)" (2024). CUNY Academic Works.
https://academicworks.cuny.edu/gc_etds/5996
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Atomic, Molecular and Optical Physics Commons, Inorganic Chemistry Commons, Materials Chemistry Commons, Other Physics Commons