Method for manufacturing semiconductor device
First Claim
1. A method for manufacturing a semiconductor device comprising the steps of:
- forming an oxide semiconductor film over an oxide insulating film;
forming a metal film covering the oxide semiconductor film;
forming a metal oxide film by adding oxygen to the metal film;
forming a gate electrode over the metal oxide film; and
forming low-resistance regions in the oxide semiconductor film by adding dopants to the oxide semiconductor film with use of the gate electrode as a mask after the gate electrode is formed,wherein the dopants are one or more of helium, neon, argon, krypton, and xenon, andwherein the dopants are contained in the low-resistance regions at a concentration of greater than or equal to 5×
1018 atoms/cm3 and smaller than or equal to 1×
1022 atoms/cm3.
1 Assignment
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Accused Products
Abstract
To improve productivity of a transistor that includes an oxide semiconductor and has good electrical characteristics. In a top-gate transistor including a gate insulating film and a gate electrode over an oxide semiconductor film, a metal film is formed over the oxide semiconductor film, oxygen is added to the metal film to form a metal oxide film, and the metal oxide film is used as a gate insulating film. After an oxide insulating film is formed over the oxide semiconductor film, a metal film may be formed over the oxide insulating film. Oxygen is added to the metal film to form a metal oxide film and added also to the oxide semiconductor film or the oxide insulating film.
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Citations
22 Claims
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1. A method for manufacturing a semiconductor device comprising the steps of:
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forming an oxide semiconductor film over an oxide insulating film; forming a metal film covering the oxide semiconductor film; forming a metal oxide film by adding oxygen to the metal film; forming a gate electrode over the metal oxide film; and forming low-resistance regions in the oxide semiconductor film by adding dopants to the oxide semiconductor film with use of the gate electrode as a mask after the gate electrode is formed, wherein the dopants are one or more of helium, neon, argon, krypton, and xenon, and wherein the dopants are contained in the low-resistance regions at a concentration of greater than or equal to 5×
1018 atoms/cm3 and smaller than or equal to 1×
1022 atoms/cm3. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for manufacturing a semiconductor device comprising the steps of:
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forming an oxide semiconductor film over a first oxide insulating film; forming a second oxide insulating film over the oxide semiconductor film; forming a gate electrode over the second oxide insulating film; forming a metal film covering the gate electrode; forming a metal oxide film by adding oxygen to the metal film, and forming low-resistance regions in the oxide semiconductor film by adding dopants to the oxide semiconductor film with use of the gate electrode as a mask after the gate electrode is formed, wherein the dopants are one or more of boron, nitrogen, phosphorus, and arsenic, and wherein the dopants are contained in the low-resistance regions at a concentration of greater than or equal to 5×
1018 atoms/cm3 and smaller than or equal to 1×
1022 atoms/cm3. - View Dependent Claims (9, 10, 11, 12)
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13. A method for manufacturing a semiconductor device comprising the steps of:
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forming an oxide semiconductor film over an oxide insulating film; forming a metal film covering the oxide semiconductor film; forming a metal oxide film by adding oxygen to the metal film; forming a gate electrode over the metal oxide film; and forming low-resistance regions in the oxide semiconductor film by adding dopants to the oxide semiconductor film with use of the gate electrode as a mask after the gate electrode is formed, wherein the dopants are one or more of boron, nitrogen, phosphorus, and arsenic, and wherein the dopants are contained in the low-resistance regions at a concentration of greater than or equal to 5×
1018 atoms/cm3 and smaller than or equal to 1×
1022 atoms/cm3. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method for manufacturing a semiconductor device comprising the steps of:
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forming an oxide semiconductor film over a first oxide insulating film; forming a second oxide insulating film over the oxide semiconductor film; forming a gate electrode over the second oxide insulating film; forming a metal film covering the gate electrode; forming a metal oxide film by adding oxygen to the metal film, and forming low-resistance regions in the oxide semiconductor film by adding dopants to the oxide semiconductor film with use of the gate electrode as a mask after the gate electrode is formed, wherein the dopants are one or more of helium, neon, argon, krypton, and xenon, and wherein the dopants are contained in the low-resistance regions at a concentration of greater than or equal to 5×
1018 atoms/cm3 and smaller than or equal to 1×
1022 atoms/cm3. - View Dependent Claims (20, 21, 22)
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Specification