Patent ID: 8598623
Filing Date: 2013-12-03
Classification: H01L

Abstract:
1. A termination structure for a semiconductor device including an active area housing active devices and a termination area surrounding the active area, the termination structure being formed in the termination area and comprising: a first semiconductor layer of a first conductivity type comprising a plurality of trenches formed in a top surface of the first semiconductor layer, the trenches forming mesas in the first semiconductor layer; a second semiconductor layer of a second conductivity type located at a bottom surface of the first semiconductor layer; a first epitaxial layer of the second conductivity type formed on sidewalls of the trenches and covering at least sidewalls of the mesas of the first semiconductor layer, the first epitaxial layer being electrically connected to the second semiconductor layer, wherein the thicknesses and the doping concentrations of the first epitaxial layer and a mesa of the first semiconductor layer are selected to achieve charge balance in operation; a first dielectric layer formed in the trenches adjacent the first epitaxial layer; and an array of termination cells formed in the termination area, the array of termination cells includes a first termination cell at an interface to the active area to a last termination cell, each termination cell comprising: