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Electrical contacts and method of manufacturing same

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TLDR
In this article, a rear contact construction on silicon solar cells comprises aluminum contacts with silver soldering pads, and the nickel is introduced into the contact construction to reduce the contact resistance between the aluminum contact material and the silver pads.
Abstract
A known rear contact construction on silicon solar cells comprises aluminum contacts with silver soldering pads. According to this invention, nickel is introduced into the contact construction to reduce the contact resistance between the aluminum contact material and the silver pads. In one embodiment, the nickel is applied as an intermediate layer (32) between the silicon substrate (2) and each silver pad (20). In a second and preferred embodiment, the nickel is incorporated into the silver ink that is used to make the soldering pads.

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References
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Journal ArticleDOI

Thick-film metallization for solar cell applications

TL;DR: In this paper, the glass frit content in the silver-based inks, the silver ink firing temperature, and the formation of the back-surface field using screen-printed aluminum layers are discussed.
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