Patent ID: 8426282
Filing Date: 2013-04-23
Classification: H01L

Abstract:
1. A method for forming a semiconductor substrate isolation, comprising: providing a SOI substrate, the SOI substrate comprising an insulating layer and a silicon layer on the insulating layer; forming a first oxide layer and a nitride layer sequentially on the SOI substrate; etching the nitride layer and the first oxide layer until parts of an upper surface of the SOI substrate are exposed, so as to form openings only in the nitride layer and the first oxide layer; implanting oxygen ions into the silicon layer of the SOI substrate and up to the insulating layer of the SOI substrate from the openings; performing annealing to form a second oxide layer, wherein the bottom of the second oxide layer reaches an upper surface of the insulating layer of the SOI substrate; and removing the nitride layer and the first oxide layer.