Patent ID: 8927386
Filing Date: 2015-01-06
Classification: H01L

Abstract:
1. A method for forming a super PN junction, comprising: a deposition step for forming an epitaxial layer on a substrate; a dielectric forming step for forming of a first dielectric layer and a second dielectric layer in sequence on the epitaxial layer; a deep trench forming step for forming deep trenches in the epitaxial layer; a first filling step before removing the second dielectric layer for completely filling the deep trenches and beyond the second dielectric layer with an epitaxial material; a second filling step for forming a surface filling layer with a predetermined thickness by filling an entire surface including the second dielectric layer and the epitaxial material, using a third dielectric, wherein the third dielectric is SOG; an etching step for etching back the surface filling layer and the epitaxial material to expose an interface of the first dielectric layer and the epitaxial layer on the substrate; and a removing step for removing the first dielectric layer, the second dielectric layer and the surface filling layer to planarize the epitaxial layer.