Batteries: thermoelectric and photoelectric – Photoelectric – Cells
Patent
1994-08-05
1996-03-05
Weisstuch, Aaron
Batteries: thermoelectric and photoelectric
Photoelectric
Cells
148 332, 148DIG122, 437 4, 437173, 437174, 437233, 437967, 428620, 427 74, 257 51, H10L 310392, H10L 310368, H10L 3118
Patent
active
054964164
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.
patent: 5336335 (1994-08-01), Hall et al.
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.
Checchi Joseph C.
Collins Sandra R.
Ford David H.
Hall Robert B.
AstroPower, Inc.
Weisstuch Aaron
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