Screen-printed al back contacts on Si solar cells: Issues and some solutions

Document Type

Conference Proceeding

Publication Date

12-24-2010

Abstract

This paper identifies some mechanisms that lead to problems in back Al contact formation. Major issues are related to a basic problem that the Al melt has a large surface tension and tries to ball up during the firing step. Other issues arise from dissolution of the Si-Al interface and entrapment of glass within the Si-Al alloy. Si diffusion into Al can be applied to control the melt, while cooling rate can help improve the structure of various regions of the back contact for a favorable series resistance. We also discuss a modified time-temperature profile that can lead to a deep and uniform back-surface field. © 2010 Materials Research Society.

Identifier

78650398703 (Scopus)

ISBN

[9781605111834]

Publication Title

Materials Research Society Symposium Proceedings

ISSN

02729172

First Page

107

Last Page

112

Volume

1210

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