Semiconductor Device and Manufacturing Method Thereof
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Abstract
An object is to obtain a semiconductor device with improved characteristics by reducing contact resistance of a semiconductor film with electrodes or wirings, and improving coverage of the semiconductor film and the electrodes or wirings. The present invention relates to a semiconductor device including a gate electrode over a substrate, a gate insulating film over the gate electrode, a first source or drain electrode over the gate insulating film, an island-shaped semiconductor film over the first source or drain electrode, and a second source or drain electrode over the island-shaped semiconductor film and the first source or drain electrode. Further, the second source or drain electrode is in contact with the first source or drain electrode, and the island-shaped semiconductor film is sandwiched between the first source or drain electrode and the second source or drain electrode. Moreover, the present invention relates to a manufacturing method of the semiconductor device.
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Citations
36 Claims
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1-10. -10. (canceled)
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11. A semiconductor device comprising:
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a gate electrode over a substrate; a gate insulating film over the gate electrode; a first source or drain electrode over the gate insulating film; an island-shaped semiconductor film including a channel forming region over the first source or drain electrode and the gate insulating film; and a second source or drain electrode over the island-shaped semiconductor film and the first source or drain electrode, wherein a part of the second source or drain electrode is formed over and directly in contact with the first source or drain electrode, wherein the island-shaped semiconductor film is sandwiched between the first source or drain electrode and the second source or drain electrode, and wherein the island-shaped semiconductor film is an inorganic semiconductor film including an indium. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A semiconductor device comprising:
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a gate electrode over a substrate; a gate insulating film over the gate electrode; a first source or drain electrode over the gate insulating film; an island-shaped semiconductor film including a channel forming region over the first source or drain electrode and the gate insulating film; an island-shaped impurity semiconductor film added with an impurity imparting one conductivity type over the island-shaped semiconductor film; and a second source or drain electrode over the island-shaped semiconductor film, the island-shaped impurity semiconductor film, and the first source or drain electrode, wherein a part of the second source or drain electrode is formed over and directly in contact with the first source or drain electrode, wherein the island-shaped semiconductor film and the island-shaped impurity semiconductor film are sandwiched between the first source or drain electrode and the second source or drain electrode, and wherein the island-shaped semiconductor film is an inorganic semiconductor film including an indium. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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25. A manufacturing method of a semiconductor device comprising the steps of:
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forming a gate electrode over a substrate; forming a gate insulating film over the gate electrode; forming first source or drain electrode over the gate insulating film; forming an island-shaped semiconductor film including a channel forming region over the first source or drain electrode and the gate insulating film; and forming a second source or drain electrode over the first source or drain electrode and the island-shaped semiconductor film, wherein a part of the second source or drain electrode is formed over and directly in contact with the first source or drain electrode, wherein the island-shaped semiconductor film is sandwiched between the first source or drain electrode and the second source or drain electrode, and wherein the island-shaped semiconductor film is an inorganic semiconductor film including an indium. - View Dependent Claims (26, 27, 28)
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29. A manufacturing method of a semiconductor device comprising the steps of:
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forming a first conductive film over a substrate; foaming a gate electrode using the first conductive film; forming a gate insulating film over the gate electrode; forming a second conductive film over the gate insulating film; forming a first source or drain electrode using the second conductive film; forming a semiconductor film over the first source or drain electrode; forming an island-shaped semiconductor film including a channel forming region using the semiconductor film; forming a third conductive film over the first source or drain electrode and the island-shaped semiconductor film; and forming a second source or drain electrode using the third conductive film, wherein a part of the second source or drain electrode is formed over and directly in contact with the first source or drain electrode, wherein the island-shaped semiconductor film is sandwiched between the first source or drain electrode and the second source or drain electrode, and wherein the island-shaped semiconductor film is an inorganic semiconductor film including an indium. - View Dependent Claims (30, 31, 32)
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33. A manufacturing method of a semiconductor device comprising the steps of:
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forming a gate electrode over a substrate; forming a gate insulating film over the gate electrode; forming a first source or drain electrode over the gate insulating film; forming an island-shaped semiconductor film including a channel forming region over the first source or drain electrode and the gate insulating film; forming an island-shaped impurity semiconductor film added with an impurity imparting one conductivity type over the island-shaped semiconductor film; and forming a second source or drain electrode over the first source or drain electrode, the island-shaped semiconductor film, and the island-shaped impurity semiconductor film, wherein a part of the second source or drain electrode is formed over and directly in contact with the first source or drain electrode, wherein the island-shaped semiconductor film and the island-shaped impurity semiconductor film are sandwiched between the first source or drain electrode and the second source or drain electrode, wherein the island-shaped semiconductor film is an inorganic semiconductor film including an indium. - View Dependent Claims (34, 35, 36)
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Specification