Patent ID: 6784060
Filing Date: 2004-08-31
Classification: H01L,Y10S

Abstract:
A method of fabricating a transistor in a semiconductor device, comprising the steps of:simultaneously growing a first nitrification oxide film on the entire structure of a semiconductor substrate in which a low voltage device region and a high voltage device region are defined and a first oxide film on the first nitrification oxide film; forming a second oxide film below the first nitrification oxide film; removing the first oxide film, the first nitrification oxide film and the second oxide film formed in the low voltage device region; simultaneously growing a second nitrification oxide film in the low voltage device region and a third oxide film on the second nitrification oxide film, and at the same time growing a third nitrification oxide film between the second oxide film and the semiconductor substrate in the high voltage device region; nitrifying the first oxide film of the high voltage device region to form a fourth nitrification oxide film formed along with the first nitrification oxide film and nitrifying the third oxide film of the low voltage device region to form a fifth nitrification oxide film formed along with the second nitrification oxide film, by means of a nitrification treatment process; forming a conductive material layer on the entire structure; forming a stack structure of a first gate oxide film consisting of a fifth nitrification oxide film and a gate in the low voltage device region and a stack structure of a second gate oxide film consisting of the third nitrification oxide film/second oxide film/fourth nitrification oxide film and a gate in the high voltage device region, by means of a patterning process; and forming an insulating spacer at the sidewalls of the gate and source/drain in the semiconductor substrate at the sidewall of the gate.