Silicon web process development [electronic resource].

Published:: Pittsburgh, Pa. : Westinghouse Electric Corporation, 1980.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:: Pages: 44 : digital, PDF file
Additional Creators:: Westinghouse Electric Corporation and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

Silicon dendritic web is a ribbon form of silicon produced from the melt without die shaping, and capable of fabrication into solar cells with greater than 15% AM1 conversion efficiency. This quarterly report describes the work carried out during the period April to June 1980, as part of Phase III of a DOE/JPL-sponsored effort to develop silicon web process technology compatible with the national goals for low cost photovoltaic output power. We have successfully demonstrated eight hours of silicon web growth with closed loop melt level control, a key contract milestone. The result was achieved using a feedback system in which the change in output from a laser melt level sensor was used to control the rate at which silicon pellets were fed to replace the material frozen into web crystal. The melt level was controlled to about +- 0.1mm, well within the range required for stable long term web growth. This is an important step toward the development of a fully automated silicon web growth machine. A second major highlight of this quarter was the completion of an engineering design for a semi-automated web growth machine embodying all the desired features developed so far as part of this program (including e.g. melt replenishment, level sensing and control) as well as some system simplifications. The completed design will serve as a basis for complete system automation.

Report Numbers:

E 1.99:doe/jpl/954654-80/12
doe/jpl/954654-80/12

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Note:

Published through SciTech Connect.
07/15/1980.
"doe/jpl/954654-80/12"
Hopkins, R.H.; Duncan, C.S.; Seidensticker, R.G.; McHugh, J.P.; Skutch, M.E.

Funding Information:

NAS-7-100-954654

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