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Title: Strictly monolayer large continuous MoS{sub 2} films on diverse substrates and their luminescence properties

Abstract

Despite a tremendous interest on molybdenum disulfide as a thinnest direct band gap semiconductor, single step synthesis of a large area purely monolayer MoS{sub 2} film has not yet been reported. Here, we report a CVD route to synthesize a continuous film of strictly monolayer MoS{sub 2} covering an area as large as a few cm{sup 2} on a variety of different substrates without using any seeding material or any elaborate pretreatment of the substrate. This is achieved by allowing the growth to take place in the naturally formed gap between a piece of SiO{sub 2} coated Si wafer and the substrate, when the latter is placed on top of the former inside a CVD reactor. We propose a qualitative model to explain why the MoS{sub 2} films are always strictly monolayer in this method. The photoluminescence study of these monolayers shows the characteristic excitonic and trionic features associated with monolayer MoS{sub 2}. In addition, a broad defect related luminescence band appears at ∼1.7 eV. As temperature decreases, the intensity of this broad feature increases, while the band edge luminescence reduces.

Authors:
; ; ;
Publication Date:
OSTI Identifier:
22489355
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 108; Journal Issue: 4; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CHEMICAL VAPOR DEPOSITION; EV RANGE; FILMS; MOLYBDENUM SULFIDES; PHOTOLUMINESCENCE; SEMICONDUCTOR MATERIALS; SILICON OXIDES; SUBSTRATES; SYNTHESIS

Citation Formats

Mohapatra, P. K., Deb, S., Singh, B. P., Vasa, P., and Dhar, S., E-mail: dhar@phy.iitb.ac.in. Strictly monolayer large continuous MoS{sub 2} films on diverse substrates and their luminescence properties. United States: N. p., 2016. Web. doi:10.1063/1.4940751.
Mohapatra, P. K., Deb, S., Singh, B. P., Vasa, P., & Dhar, S., E-mail: dhar@phy.iitb.ac.in. Strictly monolayer large continuous MoS{sub 2} films on diverse substrates and their luminescence properties. United States. doi:10.1063/1.4940751.
Mohapatra, P. K., Deb, S., Singh, B. P., Vasa, P., and Dhar, S., E-mail: dhar@phy.iitb.ac.in. Mon . "Strictly monolayer large continuous MoS{sub 2} films on diverse substrates and their luminescence properties". United States. doi:10.1063/1.4940751.
@article{osti_22489355,
title = {Strictly monolayer large continuous MoS{sub 2} films on diverse substrates and their luminescence properties},
author = {Mohapatra, P. K. and Deb, S. and Singh, B. P. and Vasa, P. and Dhar, S., E-mail: dhar@phy.iitb.ac.in},
abstractNote = {Despite a tremendous interest on molybdenum disulfide as a thinnest direct band gap semiconductor, single step synthesis of a large area purely monolayer MoS{sub 2} film has not yet been reported. Here, we report a CVD route to synthesize a continuous film of strictly monolayer MoS{sub 2} covering an area as large as a few cm{sup 2} on a variety of different substrates without using any seeding material or any elaborate pretreatment of the substrate. This is achieved by allowing the growth to take place in the naturally formed gap between a piece of SiO{sub 2} coated Si wafer and the substrate, when the latter is placed on top of the former inside a CVD reactor. We propose a qualitative model to explain why the MoS{sub 2} films are always strictly monolayer in this method. The photoluminescence study of these monolayers shows the characteristic excitonic and trionic features associated with monolayer MoS{sub 2}. In addition, a broad defect related luminescence band appears at ∼1.7 eV. As temperature decreases, the intensity of this broad feature increases, while the band edge luminescence reduces.},
doi = {10.1063/1.4940751},
journal = {Applied Physics Letters},
issn = {0003-6951},
number = 4,
volume = 108,
place = {United States},
year = {2016},
month = {1}
}