Chemical vapor deposition of MoS2 layers from Mo-S-C-O-H system: thermodynamic modeling and validation

Dhar, Sukanya and Kumar, Kranthi V and Choudhury, Tanushree H and Shivashankar, SA and Raghavan, S (2016) Chemical vapor deposition of MoS2 layers from Mo-S-C-O-H system: thermodynamic modeling and validation. In: PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 18 (22). pp. 14918-14926.

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Abstract

A detailed thermodynamic analysis of the solid and gas phases of the Mo-S-C-O-H system used for large area chemical vapor deposition (CVD) of MoS2 is presented and compared with experimental results. Given the multivariable nature of the problem, excellent agreement is observed. Deviations, observed from thermodynamic predictions, mainly at low temperatures and high flow rates have been highlighted and discussed. CVD phase diagrams which predict parameter windows in which pure MoS2 can be synthesized have been provided for important gas phase chemistries. Pure H-2 as a carrier gas is shown to facilitate the largest contamination free process window. CO presence is shown to significantly reduce the nucleation rate and enable large island sizes but at the cost of carbon contamination. Oxygen leaks are shown to result in sulphur contamination. The absence of H2S during cooling is shown to yield Mo due to the reduction of MoS2 by hydrogen. Oxidation of Mo causes oxide contamination.

Item Type:	Journal Article
Publication:	PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Publisher:	ROYAL SOC CHEMISTRY
Additional Information:	Copy right for this article belongs to the ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	17 Aug 2016 04:21
Last Modified:	17 Aug 2016 04:21
URI:	http://eprints.iisc.ac.in/id/eprint/54268

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