Process for fabricating solar cells and the product produced the

Details Process for fabricating solar cells and the product produced the Process for fabricating solar cells and the product produced the

1980-02-20

1981-07-14

Weisstuch, Aaron

Batteries: thermoelectric and photoelectric

Photoelectric

Cells

29572, 427 74, 427 88, 357 30, 357 65, 148188, H01L 3104, H01L 3118

Patent

active

042788315

ABSTRACT:
An electrically conductive, anti-reflective coating is formed on a base layer of prepared silicon in such a manner as to form a good ohmic contact therewith. If doped, the coating can serve as an impurity source during a following diffusion step, in which a PN junction is formed in the silicon. Undoped coatings may be used when the PN junction has previously been formed in the silicon. Thick film electrical contacts are then formed by screen printing on the top surface of the anti-reflective coating and then fired at high temperature, i.e. 500.degree.-1000.degree. C. The material comprising the coating is such that it acts as a barrier to the diffusion of the metal forming the electrical contacts into the silicon base layer during the firing of the thick film contacts. Since the coating is electrically conductive, a conductive path between the contacts and the silicon is established.

REFERENCES:
patent: 3416044 (1968-12-01), Dreyfus et al.
patent: 3679949 (1972-07-01), Uekusa et al.
patent: 4011578 (1977-03-01), Bollen et al.
P. A. Iles et al., "Design Factors for Transparent Conducting Layers in Solar Cells", Conf. Record, 12th IEEE Photovoltaic Specialists Conf., Nov. 1976, pp. 978-988.
H. J. Hovel et al., "Photovoltaic Devices Using Transparent Contacts", IBM Tech. Disc. Bull., vol. 18, p. 1575 (1975).
J. Michel et al., "Electrical Characterization of Silicon Diffused Layers", Proceedings Int'l Photovoltaic Solar Energy Conf., Luxembourg, Sep. 1977, Reidel Pub. Co. (1978), pp. 125-134.
L. Frisson et al., "Screen Printed Contacts on Silicon Solar Cells with Low Series Resistance", Conf. Record, 13th IEEE Photovoltaic Specialists Conf. (1978), pp. 590-592.

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