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

1997-01-24

1999-03-23

Nguyen, Nam

Batteries: thermoelectric and photoelectric

Photoelectric

Cells

257 51, 148 332, 148DIG122, 428620, 427 74, 438 96, 438 97, 438488, H01L 310392, H01L 310368, H01L 3118

Patent

active

RE0361569

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.
patent: 5486237 (1996-01-01), Sano et al.
A. Eyer et al, Conf. Record, 18.sup.th IEEE Photovoltaic Specialists Conf. (1985), pp. 1138-1141.
A. Eyer et al, Conf. Record, 19.sup.th IEEE Photovoltaic Specialists Conf. (1987), pp. 951-954.
A. Eyer et al, Conf. Record, 20.sup.th IEEE Photovoltaic Specialists Conf. (1988), pp. 1565-1568.

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