Patent ID: 9082660
Filing Date: 2015-07-14
Classification: H01L

Abstract:
1. A method of fabricating a semiconductor device, comprising: providing a wafer, wherein providing a wafer comprises forming a first film layer and an isolation structure, and a mask layer on the wafer, wherein the isolation structure passes through the first film layer and is formed in the wafer, wherein the mask layer is formed on the first film layer, wherein the first film layer is a pad oxide layer, and further comprising removing the mask layer on the pad oxide layer after forming the isolation structure; performing a film-thickness measuring step to measure a thickness of the first film layer to obtain a film-thickness value; deciding, selecting, or generating at least one parameter according to the film-thickness value; and performing an ion implantation process on the wafer, wherein the ion implantation process is executed according to the parameter to form a threshold voltage adjustment region in the wafer below the first film layer.