Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/64526
Title: Excitonic quantum confinement modified optical conductivity of monolayer and few-layered MoS2
Authors: Jia, GY
Liu, Y
Gong, JY
Lei, DY 
Wang, DL
Huang, ZX
Issue Date: 2016
Publisher: Royal Society of Chemistry
Source: Journal of materials chemistry C, 2016, v. 4, no. 37, p. 8822-8828 How to cite?
Journal: Journal of materials chemistry C 
Abstract: Optical conductivity plays an important role in characterizing the optoelectronic properties of two-dimensional materials. Here we derive the complex optical conductivities for monolayer and few-layered MoS2 films from their reflectance and transmittance responses. We show that the excitonic quantum confinement effect significantly modifies both the peak energy and magnitude of their optical conductivity, manifested by a gradual blueshift in energy (consistent with two well-known models for quantum well systems) and exponential attenuation in magnitude with decreasing layer number. More importantly, the C excition induced optical conductivity peak exhibits the strongest dependence on the MoS2 layer number because of its largest Bohr radius among the A, B and C excitons. This unambiguously confirms the strong influence of quantum confinement effect in the optical conductivity of MoS2, shedding important insights into understanding its rich exciton-related optical properties and therefore facilitating potential applications in optoelectronic devices.
URI: http://hdl.handle.net/10397/64526
ISSN: 2050-7526
EISSN: 2050-7534
DOI: 10.1039/c6tc02502a
Rights: The article is licensed under a Creative Commons Attribution 3.0 Unported (CC BY 3.0) <https://creativecommons.org/licenses/by-nc/3.0/>
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