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:
Nov. 05, 2013
Filed:
Jun. 05, 2008
Fabio Zara, Catania, IT;
Fabio Zara, Catania, IT;
STMicroelectronics S.r.l., Agrate Brianza, IT;
Abstract
A charge-balance power device formed in an epitaxial layer having a first conductivity type and housing at least two columnar structures of a second conductivity type, which extend through the epitaxial layer. A first surface region of the second conductivity type extends along the surface of the epitaxial layer on top of, and in contact with, the columns, and a second surface region of the first conductivity type extends within the first surface region, and also faces the surface of the epitaxial layer. The columns extend at a distance from one another from the first surface region so as to delimit between them an epitaxial portion that defines a current path so as to reduce the on-resistivity of the device.