Event
Ph.D. Defense: Alex Mazzoni
Tuesday, November 8, 2022
12:00 p.m.-2:00 p.m.
A. James Clark Hall, Room 3104
Maria Hoo
301 405 3681
mch@umd.edu
ANNOUNCEMENT: Ph.D. Defense
Name: Alex Mazzoni
Committee:
Professor Kevin Daniels (Chair)
Professor Neil Goldsman (Co-Chair)
Professor Agis Iliadis
Dr. Sina Najmaei
Professor Aris Christou (Dean's Representative)
Date/Time: Tuesday, November 8th, 2022 at noon to 2:00 PM
Location: A. James Clark Hall, Room 3104
Title: MONOLAYER MOLYBDENUM DISULFIDE IN SEMICONDUCTOR ELECTRONICS
Abstract:
Two-dimensional (2D) semiconductors are a new class of materials being researched due to their unique material properties at an atomic thinness. Here I investigate the use of the 2D semiconductor molybdenum disulfide (MoS2) as the active channel material in various electronic devices and circuits. A motivation is provided for 2D materials in general and monolayer MoS2 in particular, followed by an overview of the material properties of MoS2 and a relevant literature review.
Back-gated field-effect transistors (FETs) were fabricated and characterized to investigate the impact of growth conditions on material properties, as well as to study the performance of different contact metals. A top-gated fabrication process was developed to make RF transistors and simple amplifier circuits on both rigid and flexible substrates. Finally, device operating characteristics were modeled using simple transistor current-voltage equations and Monte Carlo electron transport simulations were performed to demonstrate the importance of device operating temperature and intervalley separation in the conduction band.
