Patent ID: 7326611
Filing Date: 2008-02-05
Classification: H01L,H01M,Y02E,Y02P

Abstract:
1. A method of forming a semiconductor construction comprising: providing a substrate comprising monocrystalline silicon; implanting a first dopant into an upper surface of the monocrystalline silicon; etching the monocrystalline silicon to form a first pillar, a second pillar adjacent to the first pillar, and a trench between the first and second pillars, the trench having a base surface, each of the first and second pillars having a doped upper surface and lateral sidewalls; implanting a second dopant into a first portion of the base surface to form a doped region adjacent the second pillar, the doped region extending across less than an entirety of the base surface, a second portion of the base surface lacking the second dopant after the implanting; and forming a layer of oxide material surrounding each of the pillars along the lateral sidewalls, a first portion of the oxide material being adjacent the second pillar and disposed over the doped region within the trench, and a second portion of the oxide material being adjacent the first pillar and disposed within the trench over the second portion of the base surface.