Patent ID: 7947567
Filing Date: 2011-05-24
Classification: H01L

Abstract:
1. A semiconductor device fabrication method comprising: forming an insulating film over a semiconductor substrate; forming a trench for device isolation in the semiconductor substrate; forming a first oxide film filling the trench; polishing the first oxide film over the semiconductor substrate until the insulating film is exposed; measuring a thickness of the insulating film remaining after the polishing; determining an etching amount of etching the polished first oxide film based on the measured thickness of the remaining insulating film; etching the polished first oxide film by using a treatment solution based on the determined etching amount; removing the insulating film; forming a second oxide film on the semiconductor substrate; implanting impurities into the semiconductor substrate through the second oxide film; removing the second oxide film; forming a gate insulating film on the semiconductor substrate; forming a film on the gate insulating film; and patterning the film on the gate insulating film, wherein in forming the second oxide film, a height of the first oxide film is higher than a height of the semiconductor substrate, and wherein in forming the film on the gate insulating film, the height of the first oxide film is substantially equal to the height of the semiconductor substrate.