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Rate limiting mechanism of transition metal gettering in multicrystalline silicon [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. Office of Energy Research, 1997.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
9 pages : digital, PDF file
Additional Creators
Lawrence Berkeley National Laboratory, United States. Department of Energy. Office of Energy Research, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The authors have performed studies on multicrystalline silicon used for solar cells in the as-grown state and after a series of processing and gettering steps. The principal goal of this work is to determine the rate limiting step for metal impurity gettering from multicrystalline silicon with an emphasis on the release of impurities from structural defects. Synchrotron-based x-ray fluorescence mapping was used to monitor the release process. Copper and nickel impurities were found to reside primarily at dislocations in the as-grown state of the material. Short annealing treatments rapidly dissolved the impurity agglomerates. Based on these results and modeling of the dissolution process, copper and nickel is in the form of small agglomerates (< 10 nm) clustered together over micron-scale regions in the as-grown material. Aluminum gettering further disintegrated the agglomerates to below the sensitivity of the system, 2--5 nm in radii. No significant barrier to release of copper or nickel from dislocations was observed.
Report Numbers
E 1.99:lbnl--40675
E 1.99: conf-970788--
E 1.99:lsbl--399
lsbl--399
conf-970788--
lbnl--40675
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Note
Published through SciTech Connect.
07/01/1997.
"lbnl--40675"
" conf-970788--"
"lsbl--399"
"DE97054559"
19. international confrence on defects in semiconductors, Aveiro (Portugal), 21-25 Jul 1997.
Thompson, A.C.; Imaizumi, M.; McHugo, S.A.; Hieslmair, H.; Weberr, E.R.
Funding Information
AC03-76SF00098
View MARC record | catkey: 14796441