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The importance of Soret transport in the production of high purity silicon for solar cellsTemperature-gradient-driven diffusion, or Soret transport, of silicon vapor and liquid droplets is analyzed under conditions typical of current production reactors for obtaining high purity silicon for solar cells. Contrary to the common belief that Soret transport is negligible, it is concluded that some 15-20 percent of the silicon vapor mass flux to the reactor walls is caused by the high temperature gradients that prevail inside such reactors. Moreover, since collection of silicon is also achieved via deposition of silicon droplets onto the walls, the Soret transport mechanism becomes even more crucial due to size differences between diffusing species. It is shown that for droplets in the 0.01 to 1 micron diameter range, collection by Soret transport dominates both Brownian and turbulent mechanisms.
Document ID
19860035743
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Srivastava, R.
(San Diego State University CA, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1985
Subject Category
Inorganic And Physical Chemistry
Accession Number
86A20481
Funding Number(s)
CONTRACT_GRANT: JPL-954862
Distribution Limits
Public
Copyright
Other

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