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Development of high-efficiency solar cells on silicon web. Fifth quarterly progress report, January-March 1985

Author
Rohatgi, A.
Published
United States : [publisher not identified], 1985
Springfield, Va.: National Technical Information Service, [approximately 1985]
Physical Description
microfiche : negative ; 11 x 15 cm
Additional Creators
Campbell, R. B., Meier, D. L., and Rai-Choudhury, P.

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Summary
The objective of this program is to understand and improve web silicon so that high-efficiency web cells can be fabricated using advanced cell design and processing. It is clear that high efficiency is a major attribute that will enhance the large-scale applicability of phtotvoltaic systems. Systems calculations indicate that for very large-scale terrestrial applications, greater than or equal to 15% efficient photovoltaic modules will be required at a cost of less than or equal to 50c/watt. This implies that approx. 18% efficient cells will be needed at low cost. Dendritic web silicon is a single-crystal silicon ribbon that has great potential for low-cost and high-efficiency solar cells. The loss mechanisms in dendritic web silicon are studied by investigating the electrical activity of twin planes, the role of impurities and defects in web, impurity interaction with twin planes, starting web material quality, and the effect of heat treatment and gettering on web quality. An improved understanding of the above effects should lead to fabrication of approx. 18% efficient web cells with good uniformity. Progress toward the development of high-efficiency solar cells on web silicon is described. Reported here are the results of two solar runs using low-resistivity dendritic web silicon, which were completed this quarter. In addition to fabrication low-resistivity web solar cells, laser beam-induced current (LBIC) and DLTS measurements were done on beveled web surfaces to investigate the twin plane activity as well as the twin plane interaction with the impurity.
Report Numbers
DE85017380; DOE/JPL/956786-85/5
Other Subject(s)
Collection
NTIS collection.
Note
DOE contract number: NAS-7-100-956786
OSTI Identifier 5392438
Research organization: Westinghouse Research and Development Center, Pittsburgh, PA (USA).
View MARC record | catkey: 47356976