Buoyancy plays a detrimental role in chemical vapor deposition reactors employed for thin film deposition. Buoyancy driven fluid flow causes complex flow patterns which alter the transport of the precursor gases to the substrate, and leads to nonuniform deposition patterns. Consequently, many CVD reactors operate under low pressure to mitigate these flow patterns. However, the growth rates at such pressures are relatively low. Operating a CVD reactor under vacuum conditions is also inconvenient because of the associated hardware that is required. In the present work, we have numerically explored the performance of a new type of stagnation flow CVD reactor at pressures close to atmospheric pressure. The new geometry resembles that of a pancake reactor, but the gases are supplied through a long vertical inlet. The annular wall above the substrate is maintained at a low temperature to avoid deposition on this surface. The substrate is also rotated to improve the hydrodynamic patterns and provide azimuthal symmetry. We report results of a number of high-resolution calculations in this reactor to demonstrate its merits for operation at sub-atmospheric and atmospheric pressures. It is shown that the growth rate is significantly large, in addition to a high degree of film uniformity.
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ASME 2003 Heat Transfer Summer Conference
July 21–23, 2003
Las Vegas, Nevada, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
0-7918-3695-9
PROCEEDINGS PAPER
Suppression of Buoyancy in a Prototypical CVD Reactor by Geometry Modification Available to Purchase
S. P. Vanka,
S. P. Vanka
University of Illinois at Urbana-Champaign, Urbana, IL
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Gang Luo,
Gang Luo
University of Illinois at Urbana-Champaign, Urbana, IL
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Nick G. Glumac
Nick G. Glumac
University of Illinois at Urbana-Champaign, Urbana, IL
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S. P. Vanka
University of Illinois at Urbana-Champaign, Urbana, IL
Gang Luo
University of Illinois at Urbana-Champaign, Urbana, IL
Nick G. Glumac
University of Illinois at Urbana-Champaign, Urbana, IL
Paper No:
HT2003-47180, pp. 117-125; 9 pages
Published Online:
December 17, 2008
Citation
Vanka, SP, Luo, G, & Glumac, NG. "Suppression of Buoyancy in a Prototypical CVD Reactor by Geometry Modification." Proceedings of the ASME 2003 Heat Transfer Summer Conference. Heat Transfer: Volume 3. Las Vegas, Nevada, USA. July 21–23, 2003. pp. 117-125. ASME. https://doi.org/10.1115/HT2003-47180
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