Columnar-grained polycrystalline solar cell and process of manuf

Details Columnar-grained polycrystalline solar cell and process of manuf Columnar-grained polycrystalline solar cell and process of manuf

Filed on

1994-08-05

Date issued

1996-03-05

Examiner

Weisstuch, Aaron

Patent Class

Batteries: thermoelectric and photoelectric

SubClass

Photoelectric

SubSubClass

Cells

Other Related Categories

148 332, 148DIG122, 437 4, 437173, 437174, 437233, 437967, 428620, 427 74, 257 51, H10L 310392, H10L 310368, H10L 3118

Type

Patent

Status

active

Patent number

054964164

Description

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.

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