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Thermogravimetric evaluation of the suitability of precursors for MOCVD

Kunte, GV and Shivashankar, SA and Umarji, AM (2008) Thermogravimetric evaluation of the suitability of precursors for MOCVD. In: Measurement Science and Technology, 19 (2). 025704-1-025704-7.

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A method based on the Langmuir equation for the estimation of vapour pressure and enthalpy of sublimation of subliming compounds is described. The variable temperature thermogravimetric/differential thermogravimetric (TG/DTG) curve of benzoic acid is used to arrive at the instrument parameters. Employing these parameters, the vapour pressure–temperature curves are derived for salicylic acid and camphor from their TG/DTG curves.The values match well with vapour pressure data in the literature, obtained by effusion methods. By employing the Clausius–Clapeyron equation, the enthalpy of sublimation could be calculated. Extending the method further, two precursors for metal-organic chemical vapour deposition (MOCVD) of titanium oxide bis-isopropyl bis tert-butyl 2-oxobutanoato titanium, $Ti{(O^iPr)}_2(tbob)_2$, and bis-oxo-bis-tertbutyl 2-oxobutanoato titanium, $[TiO(tbob)_2]_2$, have been valuated. The complex $Ti{(O^iPr)}_2(tbob)_2$ is found to be a more suitable precursor.This approach can be helpful in quickly screening for the suitability of a compound as a CVD precursor.

Item Type: Journal Article
Publication: Measurement Science and Technology
Publisher: Institute of Physics
Additional Information: Copyright of this article belongs to Institute of Physics.
Keywords: vapour pressure;sublimation;Langmuir equation;precursor;metalorganic chemical vapour deposition (MOCVD);Clausius–Claypeyron equation;thermogravimetry.
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 08 Oct 2008 10:37
Last Modified: 19 Sep 2010 04:50
URI: http://eprints.iisc.ac.in/id/eprint/16080

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