Laser-zone growth in a Ribbon-to-Ribbon (RTR) process, silicon sheet growth development for the Large Area Silicon Sheet Task of the Low Cost Silicon Solar Array Project. Technical quarterly report No. 6, October 10--December 31, 1977 [electronic resource].
- Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 1977.
- Physical Description:
- Pages: 107 : digital, PDF file
- Additional Creators:
- United States. Department of Energy. Office of Scientific and Technical Information
- The objective of this research is to fully investigate the Ribbon-to-Ribbon (RTR) approach to silicon ribbon growth. An existing RTR apparatus is to be upgraded to its full capabilities and operated routinely to investigate and optimize the effects of various growth parameters on growth results. A new RTR apparatus is to be constructed to incorporate increased capabilities and improvements over the first apparatus and to be capable of continuous growth. Material analyses and solar cell fabrication process optimization are to be performed with a goal of 12% cell efficiency. During this quarter the laser lab was relocated and operation resumed. New high power lasers have been implemented and this has led to major improvements in growth velocity--4''/min. growth has been demonstrated. This high growth capability has been accompanied, however, with the appearance of dendritic growth. A major step in demonstration of the full feasibility of the RTR process is reported in the demonstration of RTR growth from CVD polyribbon rather than selected polyribbon ingots. Cell and material evaluations have continued. Average solar cell efficiencies of >9% and a best cell efficiency of 11.7% are reported. Processing has been shown to provide a substantial improvement in material minority carrier diffusion length. An economic analysis is reported which treats both the polyribbon fabrication and RTR processes. Indications are that the long term DOE goals may be met.
- Published through SciTech Connect.
Sopori, B; Legge, R; Baghdadi, A; Ellis, R J; Gurtler, R W.
Motorola, Inc., Phoenix, Ariz. (USA). Semiconductor Group
- Funding Information:
View MARC record | catkey: 14462447