Manufacturing method of semiconductor device
First Claim
1. A method for manufacturing a semiconductor device comprising the steps of:
- forming an oxide insulating film over a substrate by sputtering method;
forming an oxide semiconductor film over and in contact with an entire top surface of the oxide insulating film;
performing a heat treatment after forming the oxide semiconductor film;
forming an island-shaped oxide semiconductor film by etching parts of the oxide semiconductor film after performing the heat treatment;
forming a gate insulating film over the island-shaped oxide semiconductor film; and
forming a gate electrode overlapping with the island-shaped oxide semiconductor film with the gate insulating film provided therebetween,wherein hydrogen concentration in the oxide semiconductor film is reduced by the heat treatment,wherein the heat treatment is performed at a temperature higher than or equal to 150°
C. and lower than or equal to 450°
C., andwherein an amount of oxygen desorbed from the oxide insulating film by the heat treatment is higher than or equal to 1.0×
1018 atoms/cm3.
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Accused Products
Abstract
A transistor with superior electric characteristics is manufactured. An oxide insulating film is formed over a substrate, an oxide semiconductor film is formed over the oxide insulating film, heat treatment is then conducted at a temperature at which hydrogen contained in the oxide semiconductor film is desorbed and part of oxygen contained in the oxide insulating film is desorbed, then the heated oxide semiconductor film is etched into a predetermined shape to form an island-shaped oxide semiconductor film, a pair of electrodes is formed over the island-shaped oxide semiconductor film, a gate insulating film is formed over the pair of electrodes and the island-shaped oxide semiconductor film, and a gate electrode is formed over the gate insulating film.
160 Citations
23 Claims
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1. A method for manufacturing a semiconductor device comprising the steps of:
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forming an oxide insulating film over a substrate by sputtering method; forming an oxide semiconductor film over and in contact with an entire top surface of the oxide insulating film; performing a heat treatment after forming the oxide semiconductor film; forming an island-shaped oxide semiconductor film by etching parts of the oxide semiconductor film after performing the heat treatment; forming a gate insulating film over the island-shaped oxide semiconductor film; and forming a gate electrode overlapping with the island-shaped oxide semiconductor film with the gate insulating film provided therebetween, wherein hydrogen concentration in the oxide semiconductor film is reduced by the heat treatment, wherein the heat treatment is performed at a temperature higher than or equal to 150°
C. and lower than or equal to 450°
C., andwherein an amount of oxygen desorbed from the oxide insulating film by the heat treatment is higher than or equal to 1.0×
1018 atoms/cm3. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for manufacturing a semiconductor device comprising the steps of:
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forming an oxide insulating film on a substrate by sputtering method; forming an oxide semiconductor film over and in contact with an entire top surface of the oxide insulating film; performing a heat treatment after forming the oxide semiconductor film; forming an island-shaped oxide semiconductor film by etching the oxide semiconductor film after performing the heat treatment; forming source and drain electrodes on the island-shaped oxide semiconductor film, wherein hydrogen concentration in the oxide semiconductor film is reduced by the heat treatment, wherein the heat treatment is performed at a temperature higher than or equal to 150°
C. and lower than or equal to 450°
C., andwherein an amount of oxygen desorbed from the oxide insulating film by the heat treatment is higher than or equal to 1.0×
1018 atoms/cm3. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method for manufacturing a semiconductor device comprising the steps of:
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forming an oxide insulating film over a substrate by sputtering method; forming an oxide semiconductor film covering an entire top surface of the oxide insulating film; performing a heat treatment after the oxide insulating film is covered with the oxide semiconductor film; forming an island-shaped oxide semiconductor film by etching parts of the oxide semiconductor film after performing the heat treatment; forming source and drain electrodes over the island-shaped oxide semiconductor film; forming a gate insulating film over the island-shaped oxide semiconductor film and the source and drain electrodes; and forming a gate electrode overlapping with the island-shaped oxide semiconductor film with the gate insulating film provided therebetween, wherein hydrogen concentration in the oxide semiconductor film is reduced by the heat treatment, wherein the heat treatment is performed at a temperature higher than or equal to 150°
C. and lower than or equal to 450°
C., andwherein an amount of oxygen desorbed from the oxide insulating film by the heat treatment is higher than or equal to 1.0×
1018 atoms/cm3. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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Specification