Patent ID: 7064385
Filing Date: 2006-06-20
Classification: H01L

Abstract:
1. A DMOS-transistor in a semiconductor body comprising: a trench in said semiconductor body bounded by a source-side wall, a drain-side wall, and a floor extending in a lateral direction between bottom ends of said walls; and a drift region including a doped source-side wall region in said semiconductor body along said source-side wall, a doped drain-side wall region in said semiconductor body along said drain-side wall, and a doped floor region in said semiconductor body extending in said lateral direction along said floor; wherein said floor region exhibits a dopant concentration gradient, in said lateral direction, of an implanted dopant that is implanted into said floor region to establish a higher dopant concentration in a first floor portion of said floor region and a lower dopant concentration in a second floor portion of said floor region.