Solar cells and method for making same

Batteries: thermoelectric and photoelectric – Thermoelectric – Radiation pyrometer

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29572, 148174, 148175, 427 74, 357 16, H01L 3104, B05D 512

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active

039752119

ABSTRACT:
Solar cell elements are produced in accordance with the present invention in which a Cu.sub.2 S thin film is epitaxially formed on a CdS film by vacuum deposition in a heterojunction forming relationship. By a first method a Cu.sub.2 S layer on the order of 1/100 micron in thickness is formed on a CdS polycrystalline thin film by dipping in a solution of cuprous ions. The CdS film itself is less than 5 microns thick and rests on a conductive substrate. After the dipping step the Cu.sub.2 S film is increased to a thickness on the order of 1/10 micron by vapor evaporation of an additional amount of Cu.sub.2 S. By a second method both the CdS and Cu.sub.2 S are entirely vapor deposited on a substrate to achieve approximately the same final structure as the first method.

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