The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 30, 2001
Filed:
Sep. 20, 2000
Martin Matschitsch, Feistritz I. Ros., AT;
Thomas Laska, München, DE;
Herbert Mascher, Kötschach, AT;
Andreas Mätzler, Bodensorf, AT;
Werner Stefaner, Villach, AT;
Gernot Moik, Sattendorf, AT;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
To markedly reduce wafer warping of semiconductor wafers without weakening the strength of adhesion to substrate materials, a novel back side metallizing system is presented. On a silicon semiconductor body an aluminum layer and a diffusion barrier layer that includes titanium are provided. A titanium nitride layer is incorporated into the titanium layer because it has been demonstrated that the titanium nitride layer can compensate for a large proportion of the wafer warping that occurs. Preferably, the usual tempering for improving the ohmic contact between the aluminum layer and the silicon semiconductor body is not performed after the complete metallizing of the semiconductor body, but rather after a first, thin aluminum layer has been deposited onto the silicon semiconductor body.