Batteries: thermoelectric and photoelectric – Photoelectric – Cells
Patent
1992-10-09
1994-08-09
Weisstuch, Aaron
Batteries: thermoelectric and photoelectric
Photoelectric
Cells
148 332, 148DIG122, 437 4, 437173, 437174, 437233, 437967, 428620, 257 51, H01L 310392, H01L 310368, H01L 3118
Patent
active
053363353
ABSTRACT:
The invention relates to techniques for manufacturing columnar-grained polycrystalline sheets which have particular utility as substrates or wafers for solar cells. The sheet is made by applying granular silicon to a setter material which supports the granular material. The setter material and granular silicon are subjected to a thermal profile all of which promote columnar growth by melting the silicon from the top downwardly. The thermal profile sequentially creates a melt region at the top of the granular silicon and then a growth region where both liquid and a growing polycrystalline sheet layer coexist. An annealing region is created where the temperature of the grown polycrystalline silicon sheet layer is controllably reduced to effect stress relief.
REFERENCES:
patent: 3953876 (1976-04-01), Sirtl et al.
The Conference Record of the 17th IEEE Photovoltaic Specialists Conference May 1, 1984, Kissimee, Florida, US pp. 1382-1383 Norman et al. `Solar Grade Si Substrates by the Powder-to-Ribbon Process`.
The Conference Record of the 19th IEEE Photovoltaic Specialists Conference May 4, 1987, New Orleans, Louisiana, US pp. 1486-1487 Harris et al. `The Production of Silicon Layers on Graphite for Photovoltaic Use`.
Journal of Crystal Growth vol. 104, No. 1, Jul. 1, 1990, Amsterdam NL pp. 108-112 Lange et al. `Ribbon Growth on Substrate(RGS)--A New Approach to High Speed Growth of Silicon Ribbons for Photovoltaic`.
A. Eyer et al, Conf. Record, 18th IEEE Photovoltaic Specialists Conf. (1985), pp. 1138-1141.
A. Eyer et al, Conf. Record, 19th IEEE Photovoltaic Specialists Conf. (1987), pp. 951-954.
A. Eyer et al, Conf. Record, 20th IEEE Photovoltaic Specialists Conf. (1988), pp. 1565-1568.
Barnett Allen M.
Brown Jacob E.
Checchi Joseph C.
Ford David H.
Hall Robert B.
AstroPower, Inc.
Weisstuch Aaron
LandOfFree
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