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Thermal Annealing Effects on Naturally Contacted Monolayer MoS 2
Author(s) -
Bizhani Maryam,
Thorat Ruhi,
Poston William,
Wickramasinghe Thushan,
Aleithan Shrouq H.,
Stinaff Eric
Publication year - 2021
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.202000426
Subject(s) - annealing (glass) , monolayer , materials science , nucleation , photoluminescence , crystallinity , chemical vapor deposition , grain boundary , blueshift , luminescence , nanotechnology , chemical engineering , optoelectronics , metallurgy , composite material , microstructure , chemistry , organic chemistry , engineering
Transition metal dichalcogenides such as MoS 2 , which can be produced in monolayer form, have attracted attention because of their interesting and potentially useful electrical and optical properties. These properties often depend sensitively on material properties such as defect density and crystallinity. Herein, the effects of postgrowth annealing on monolayer MoS 2 grown using a novel chemical vapor deposition process are investigated. In this process bulk molybdenum patterns serve as the nucleation site and source material for high‐quality MoS 2 material growth. After postgrowth thermal annealing, the photoluminescence is found to blueshift and become more uniform up to an annealing temperature of 300 °C. At higher temperatures, isolated monolayers begin to crack along the grain boundaries, which leads to variations in luminescence, whereas after annealing temperature of 200 °C, material anchored to the molybdenum patterns is found to easily ablate.