Patent ID: 6579769
Filing Date: 2003-06-17
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device comprising the steps of:forming an oxidation preventing layer on a surface of a semiconductor substrate; forming a first window by patterning the oxidation preventing layer; placing the semiconductor substrate in a first atmosphere in which an oxygen gas and a first amount of a chlorine or chloride gas are supplied, and then heating the semiconductor substrate at a first temperature such that a first field oxide layer is to grown by thermally oxidizing the surface of the semiconductor substrate exposed from the first window; forming a second window by patterning the oxidation preventing layer; and placing the semiconductor substrate in a second atmosphere in which the oxygen gas and a second amount, which is larger than the first amount, of the chlorine or chloride gas are supplied, and then heating the semiconductor substrate at a second temperature such that a second field oxide layer is formed and that a thickness of the first field oxide layer formed below the first window is enhanced.