Coating processes – Electrical product produced – Photoelectric
Patent
1977-02-11
1978-08-01
Esposito, Michael F.
Coating processes
Electrical product produced
Photoelectric
427123, 427261, 427372R, 427383A, 427383D, 427421, 136 89CD, 136 89TF, 148188, 29572, 357 16, 357 59, B05D 512, H01M 200
Patent
active
041044207
ABSTRACT:
A large area photovoltaic cell comprising a layer of multicrystalline cadmium sulfide, about 1 to 2 microns thick, formed by simultaneously spraying two suitably selected compounds on a uniformly heated plate of Nesa glass, thereafter forming a coating of Cu.sub.2 S over the cadmium sulfide layer while the latter is heated, to form a photovoltaic heterojunction, applying thereover a layer of CuSO.sub.4, and applying electrodes of Cu and Zn, respectively, to separated areas of the layer of CuSO.sub.4, and heating the cell to form a cuprous oxide rectifying junction under the copper electrode by reaction of the Cu electrode with the CuSO.sub.4, while diffusing the zinc through the body of the cell. The diffusion of the zinc provides a negative electrode coplanar with the positive copper electrode, eliminating any need for introducing mechanically complex provision for making a connection to the Nesa glass, while the use of a CuSO.sub.4 --Cu combination enables use of a layer of CdS only 1 to 2 microns thick, rather than the usual 20 microns, despite the fact that such thin layers tend to have pinholes, which in the prior art render the cells inoperative, but in the present teaching do not.
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Jordan John F.
Lampkin Curtis
Esposito Michael F.
Photon Power, Inc.
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