Insulation film semiconductor device and method
First Claim
1. A semiconductor device comprising:
- a semiconductor substrate;
a first element-separating insulator film that is formed and selectively left on the semiconductor substrate so as to perform element separation for the first transistor-formation region;
a second element-separating insulator film that is formed by selective oxidation of the surface layer of the semiconductor substrate so as to perform element separation for the second transistor-formation region;
a first transistor that is formed in the region separated by the first element-separating insulator film and has a first channel-formation region and a first source/drain region formed on the semiconductor substrate, a first gate-insulation film with the first film thickness formed on the first channel-formation region, and a first gate electrode formed on the first gate-insulation film; and
and a second transistor that is formed in the region separated by the second element-separating insulator film and has a second channel-formation region and a second source/drain region formed on the semiconductor substrate, a second gate-insulation film with a second film thickness less than the first film thickness and formed on the second channel-formation region, and a second gate electrode formed on the second gate-insulation film.
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Abstract
A semiconductor device and method of its manufacturing method are provided for realizing smaller low voltage transistors while maintaining the characteristics of high voltage transistors. A first transistor formation region is separated by selectively leaving first element-separating insulator film. A second transistor formation region is separated by selectively oxidized second element-separating insulator film. On the region separated by first element-separating insulator film, a first transistor having a first channel-formation region, first source/drain regions, and first gate-insulation film with a first film thickness and first gate electrode are formed. On the region separated by second element-separating insulator film, second transistors having a second channel-formation region, second source/drain region second gate-insulation film with thickness thinner than the first film thickness, and a second gate electrode are formed.
10 Citations
13 Claims
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1. A semiconductor device comprising:
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a semiconductor substrate;
a first element-separating insulator film that is formed and selectively left on the semiconductor substrate so as to perform element separation for the first transistor-formation region;
a second element-separating insulator film that is formed by selective oxidation of the surface layer of the semiconductor substrate so as to perform element separation for the second transistor-formation region;
a first transistor that is formed in the region separated by the first element-separating insulator film and has a first channel-formation region and a first source/drain region formed on the semiconductor substrate, a first gate-insulation film with the first film thickness formed on the first channel-formation region, and a first gate electrode formed on the first gate-insulation film; and
and a second transistor that is formed in the region separated by the second element-separating insulator film and has a second channel-formation region and a second source/drain region formed on the semiconductor substrate, a second gate-insulation film with a second film thickness less than the first film thickness and formed on the second channel-formation region, and a second gate electrode formed on the second gate-insulation film. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for manufacturing a semiconductor device characterized by the following operation steps:
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a step in which the first transistor-formation region of the semiconductor substrate having the first channel-formation region is selectively left for element separation to form the first element-separating insulator film;
a step in which the surface layer portion of the semiconductor substrate is selectively oxidized for element separation of the second transistor-formation region of the semiconductor substrate having the second channel-formation region to form the second element-separating insulator film;
a step in which the first gate-insulation film with the first film thickness is formed on the surface of the semiconductor substrate in the first transistor-formation region;
a step in which the second gate-insulation film with the second film thickness less than the second film thickness is formed on the surface of the semiconductor substrate in the second transistor-formation region;
a step in which the first gate electrode is formed on the first gate-insulation film, and the second gate electrode is formed on the second gate-insulation film; and
a step in which the first source/drain region connected to the first channel-formation region is formed, and the second source/drain region connected to the second channel-formation region is formed. - View Dependent Claims (10, 11, 12, 13)
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Specification