Doctoral Dissertations

Keywords and Phrases

Anomalous Hall Effect; Compound Semiconductors; Frequency Selective Surfaces; Metal-Organic Chemical Vapor Deposition; Photovoltaics; Spintronics

Abstract

"Suitability of wide bandgap semiconductors for room temperature (RT) spintronic, and photovoltaic applications is investigated.

Spin properties of metal-organic chemical vapor deposition (MOCVD) – grown gadolinium-doped gallium nitride (GaGdN) are studied and underlying mechanism is identified. GaGdN exhibits Anomalous Hall Effect at room temperature if it contains oxygen or carbon atoms but shows Ordinary Hall Effect in their absence. The mechanism for spin and ferromagnetism in GaGdN is a combination of intrinsic, metallic conduction, and carrier-hopping mechanisms, and is activated by oxygen or carbon centers at interstitial or similar sites. A carrier-related mechanism in MOCVD-grown GaGdN at room temperature makes it a suitable candidate for spintronic applications.

Zinc oxide (ZnO) doped with transition metals such as nickel and manganese and grown by MOCVD is investigated, and bandgap tunability is studied. A bandgap reduction with transition metal doping is seen in ZnO with dilute doping of nickel or manganese. Transition metals could introduce energy states in ZnO that result in a bandgap reduction and could be tuned and controlled by growth conditions and post-growth processing such as annealing, for spintronic and photovoltaic applications”--Abstract, page iii.

Advisor(s)

Ferguson, Ian T.
Zhou, Chuanle

Committee Member(s)

Lu, Na
Kinzel, Edward C.
Kim, Chang-Soo
Watkins, Steve Eugene, 1960-
Huang, Jie

Department(s)

Electrical and Computer Engineering

Degree Name

Ph. D. in Electrical Engineering

Comments

The author is grateful to Columbus Photovoltaic LLC, and National Science Foundation for their financial support to conduct the PhD research work.

Publisher

Missouri University of Science and Technology

Publication Date

Summer 2020

Pagination

xxv, 244 pages

Note about bibliography

Includes bibliographic references (pages 207-243).

Rights

© 2020 Vishal Saravade, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Thesis Number

T 12095

Download

Share

 
COinS