Patent ID: 9034764
Filing Date: 2015-05-19
Classification: B81B,B81C,H01L

Abstract:
1. A method of forming an encapsulated continuous wide trench comprising: providing a silicon on oxide insulator (SOI) wafer; defining a first side of a first sacrificial silicon slab by etching a first trench portion in a silicon layer of the SOI wafer; defining a second side of the first sacrificial silicon slab by etching a second trench portion in the silicon layer; filling the first trench with a first sacrificial oxide portion; filling the second trench with a second sacrificial oxide portion; forming a polysilicon layer above the first sacrificial oxide portion and the second sacrificial oxide portion; and etching the first sacrificial oxide portion to form a first portion of a continuous wide trench and etching the second sacrificial oxide portion to form a second portion of the continuous wide trench, wherein the continuous wide trench extends through a space formerly occupied by the first sacrificial silicon slab.