METHODS OF FABRICATING SEMICONDUCTOR DEVICE

摘要

A method for manufacturing a semiconductor device is provided to form a fine pattern through a simple method using self-aligned double patterning. A first oxide layer pattern(20a) is formed on a silicon substrate. The silicon substrate is etched to a predetermined depth by using the first oxide layer pattern as an etch mask. A first silicon layer pattern is formed on the silicon substrate and the first oxide layer pattern in order to form a groove between the oxide layer patterns. A second oxide layer pattern(40b) having a top surface corresponding to the top surface of the first oxide layer pattern is formed in the groove. A second silicon layer pattern is formed by removing a part of the first silicon layer pattern higher than the top surface of the second oxide layer pattern. A third silicon layer pattern(30c) is formed by heating the second silicon layer pattern.