Patent ID: 9029236
Filing Date: 2015-05-12
Classification: H01L

Abstract:
1. A method of making a semiconductor device with a termination structure being an oxide-filled large deep trench (OFLDT) having trench size TCS and trench depth TCD with multiple embedded conductive regions (MECR) therein, the method comprises: a) providing a bulk semiconductor layer (BSL), having a thickness BSLT>TCD, and mapping out a large trench top area (LTTA) atop the BSL with its geometry approximately equal to that of OFLDT; b) partitioning the LTTA into interspersed, complementary interim areas ITA-A and ITA-B each of pre-determined geometry; c) creating, into the top BSL surface, a plurality of interim vertical trenches by removing bulk semiconductor materials corresponding to ITA-B till the depth TCD; d) converting the bulk semiconductor materials corresponding to ITA-A into oxide columns and leaving a plurality of residual trench spaces there between; and e) filling the residual trench spaces with a conductive trench material and shaping it into the MECR between the converted oxide columns wherein said conductive trench material is made of polycrystalline semiconductor.