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Liquid and Solid Precursor Delivery Systems in Gas Phase Processes

Vahlas, Constantin and Caussat, Brigitte and Gladfelter, Wayne L. and Senocq, François and Gladfelter, Elisabeth Liquid and Solid Precursor Delivery Systems in Gas Phase Processes. (2015) Recent Patents on Materials Science, vol. 8 (n° 2). pp. 91-108. ISSN 1874-4648

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Official URL: http://dx.doi.org/10.2174/1874464808666150324230711

Abstract

Due to attractive surface properties and to intrinsic brittleness of Complex Metallic Alloys (CMAs), most of their potential applications involve materials with high surface-to-volume ratios, including thin films and coatings. While physical vapor deposition techniques are efficient for the processing of CMA films on line-of-sight surfaces, chemical vapor deposition (CVD) is well positioned for their application on complex surfaces. However, for CVD process to be implemented efficiently in the processing of CMA films a number of challenges must be addressed. Because numerous CVD reagents, commonly called precursors, are low vapor pressure liquids or solids, one of these challenges is the production of vapors of such precursors, which are decomposed in the deposition chamber to provide the desired film. Such a production has to be ensured at high rate and must be reproducible and stable during the whole process. Actual solutions to this question involve (i) bubbling inert gas through thermally regulated liquid precursors, (ii) leaching the surface of fixed precursor powder beds, and (iii) in situ generating the precursor flow by passing a reactive gas through a thermally regulated bed of the metallic element to be transported. Such solutions neither may be satisfactory for actual R&D needs nor may be transferable to industrial environments. These reasons are in part responsible for the limited implementation of advanced materials (including CMA-based ones) in numerous industrial and hence societal needs. More recently, innovative solutions have been proposed to feed deposition systems based on vapor phase chemical techniques (CVD and Atomic Layer Deposition, ALD). Such solutions are Direct Liquid Injection (DLI) of dissolved solid precursors and also sublimation of the latter in fluidized beds or in elaborated fixed beds. Such technological responses show promise for industrial applications of CVD, especially for the deposition of metals and ceramic compounds for which the available molecular and inorganic precursors present low vapor pressures. This review provides an overview of the methods by which precursor vapors are transported to the deposition chamber. Early and recent patents dedicated to such technologies will be revisited and considered in the light of the deposition of multimetallic alloy coatings.

Item Type:Article
Additional Information:Thanks to Bentham Science Publishers. The definitive version is available at http://benthamscience.com/index.php The original PDF of the article can be found at Recent Patents on Materials Science website : http://benthamscience.com/journal/abstracts.php?journalID=rpmats&articleID=129749
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS (FRANCE)
Other partners > University of Minnesota (USA)
Laboratory name:
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Deposited By: Brigitte CAUSSAT-BONNANS
Deposited On:18 Jun 2015 12:56

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