Patent ID: 8487370
Filing Date: 2013-07-16
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a semiconductor body including a trench, a first sidewall of the trench being opposed to a second sidewall of the trench; a first electrode in a lower portion of the trench; a second electrode in an upper portion of the trench; a dielectric structure in the trench, the dielectric structure including a first portion between the first electrode and the second electrode; wherein the first portion of the dielectric structure includes, in sequence along a lateral direction from the first sidewall to the second sidewall, a first part including a first dielectric material, a second part including a second dielectric material being selectively etchable to the first dielectric material, a third part including the first dielectric material, the first dielectric material of the third part being continuously arranged along a vertical direction from a top side of the first electrode to a bottom side of the second electrode, a fourth part including the second dielectric material and a fifth part including the first dielectric material; and wherein the top side of the first electrode is arranged below a bottom side of the second part.