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Laser Writing Graphite Conducting Lines

IP.com Disclosure Number: IPCOM000037922D
Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Donelon, JJ: AUTHOR

Abstract

A thin film circuit can be generated by writing lines directly on a substrate from a previously coated dry graphite coating. A substrate, e.g., an insulating substrate, is immersed in a solution of graphite. A graphite coating settles on the substrate surface. The substrate is moved from the solution. The coating is dried, e.g., by hot plate heating for about 30 seconds at 40oC. A laser, e.g., argon laser, is selectively focused onto the graphite coating which forms conducting lines from the graphite. The remainder of the settled graphite coating is removed, for example in an agitated alcohol bath.

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Laser Writing Graphite Conducting Lines

A thin film circuit can be generated by writing lines directly on a substrate from a previously coated dry graphite coating. A substrate, e.g., an insulating substrate, is immersed in a solution of graphite. A graphite coating settles on the substrate surface. The substrate is moved from the solution. The coating is dried, e.g., by hot plate heating for about 30 seconds at 40oC. A laser, e.g., argon laser, is selectively focused onto the graphite coating which forms conducting lines from the graphite. The remainder of the settled graphite coating is removed, for example in an agitated alcohol bath.

In microelectronics this method is useful to repair breaks or opens in conducting lines on chips or packaging substrates. The method is also useful to short adjacent conducting lines. The chip or substrate with metal patterns thereon is placed in the graphite solution as above. The laser is focused in the region of repair on modification to form conducting graphite. The excess graphite is removed. Metals, e.g., Au, Ag, Cr, can be plated onto the graphite conductor, e.g., by laser plating.

Disclosed anonymously.

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