Patent ID: 9000516
Filing Date: 2015-04-07
Classification: H01L

Abstract:
1. A super-junction device comprising a unit region, the unit region comprising: a heavily doped substrate having a first type of conductivity; a first epitaxial layer having the first type of conductivity over the heavily doped substrate; a second epitaxial layer having a second type of conductivity over the first epitaxial layer; a plurality of first trenches in the second epitaxial layer; an oxide film in each of the plurality of first trenches; and a pair of first films having the first type of conductivity on both sides of each of the plurality of first trenches, thereby forming a sandwich structure between every two adjacent ones of the plurality of first trenches, the sandwich structure including two first films and a second film having the second type of conductivity sandwiched therebetween, the second film being formed of a portion of the second epitaxial layer between the two first films of a sandwich structure.