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:
Jun. 01, 2010
Filed:
May. 31, 2006
Christopher Harris, Rockville, MD (US);
Cem Basceri, Reston, VA (US);
Kent Bertilsson, Sundsvall, SE;
Christopher Harris, Rockville, MD (US);
Cem Basceri, Reston, VA (US);
Kent Bertilsson, Sundsvall, SE;
Cree Sweden AB, Kista, SE;
Abstract
A semiconductor device of unipolar type has Schottky-contacts () laterally separated by regions in the form of additional layers (″) of semiconductor material on top of a drift layer (). Said additional layers being doped according to a conductivity type being opposite to the one of the drift layer. At least one (″) of the additional layers has a substantially larger lateral extension and thereby larger area of the interface to the drift layer than adjacent such layers () for facilitating the building-up of a sufficient voltage between that layer and the drift layer for injecting minority charge carriers into the drift layer upon surge for surge protection.