Semiconductor device and manufacturing method thereof
First Claim
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1. An active matrix liquid crystal display device comprising:
- a gate electrode over a substrate;
an insulating film over the gate electrode;
an oxide semiconductor film over the gate electrode with the insulating film interposed therebetween;
a channel protective film formed over the oxide semiconductor film, the channel protective film having a taper shape;
a source electrode and a drain electrode formed over the oxide semiconductor film and the channel protective film, wherein the source electrode is in contact with a side surface of the oxide semiconductor film and the drain electrode is in contact with a side surface of the oxide semiconductor film;
a passivation film comprising an insulating material formed over at least the source electrode, the drain electrode, the channel protective film and the oxide semiconductor film; and
a pixel electrode formed over the passivation film and electrically connected to one of the source electrode and the drain electrode,wherein a channel region of the oxide semiconductor film comprises an oxide semiconductor comprising zinc and indium.
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Abstract
An object is to provide a semiconductor device of which a manufacturing process is not complicated and by which cost can be suppressed, by forming a thin film transistor using an oxide semiconductor film typified by zinc oxide, and a manufacturing method thereof. For the semiconductor device, a gate electrode is formed over a substrate; a gate insulating film is formed covering the gate electrode; an oxide semiconductor film is formed over the gate insulating film; and a first conductive film and a second conductive film are formed over the oxide semiconductor film. The oxide semiconductor film has at least a crystallized region in a channel region.
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Citations
136 Claims
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1. An active matrix liquid crystal display device comprising:
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a gate electrode over a substrate; an insulating film over the gate electrode; an oxide semiconductor film over the gate electrode with the insulating film interposed therebetween; a channel protective film formed over the oxide semiconductor film, the channel protective film having a taper shape; a source electrode and a drain electrode formed over the oxide semiconductor film and the channel protective film, wherein the source electrode is in contact with a side surface of the oxide semiconductor film and the drain electrode is in contact with a side surface of the oxide semiconductor film; a passivation film comprising an insulating material formed over at least the source electrode, the drain electrode, the channel protective film and the oxide semiconductor film; and a pixel electrode formed over the passivation film and electrically connected to one of the source electrode and the drain electrode, wherein a channel region of the oxide semiconductor film comprises an oxide semiconductor comprising zinc and indium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An active matrix liquid crystal display device comprising:
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a scanning line formed over a substrate; a signal line formed over the substrate across the scanning line; at least two thin film transistors fowled over the substrate, each of the two thin film transistors comprising an oxide semiconductor film, a channel protective film over the oxide semiconductor film, a source electrode over the oxide semiconductor film and the channel protective film, and a drain electrode over the oxide semiconductor film and the channel protective film; and a pixel electrode formed over the substrate, wherein the channel protective film has a taper shape, wherein the source electrode is in contact with a side surface of the oxide semiconductor film and the drain electrode is in contact with a side surface of the oxide semiconductor film, wherein the two thin film transistors are electrically connected to the pixel electrode in series, and a gate electrode of each of the two thin film transistors is electrically connected to the scanning line, wherein a channel region of the oxide semiconductor film has crystallinity and comprises an oxide semiconductor comprising zinc and indium. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. An active matrix liquid crystal display device comprising:
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a scanning line formed over a substrate; a signal line formed over the substrate across the scanning line; at least two thin film transistors formed over the substrate, each of the two thin film transistors comprising an oxide semiconductor film, a channel protective film over the oxide semiconductor film, a source electrode over the oxide semiconductor film and the channel protective film, and a drain electrode over the oxide semiconductor film and the channel protective film; and a pixel electrode, wherein the channel protective film has a taper shape, wherein the source electrode is in contact with a side surface of the oxide semiconductor film and the drain electrode is in contact with a side surface of the oxide semiconductor film, wherein a gate electrode of each of the two thin film transistors is electrically connected to the scanning line, and the two thin film transistors are connected between the pixel electrode and the signal line in series, and wherein a channel region of the oxide semiconductor film comprises an oxide semiconductor comprising zinc and indium. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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26. An active matrix liquid crystal display device comprising:
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a first thin film transistor formed over a substrate, the first thin film transistor including; a first gate electrode over the substrate; a first insulating film over the first gate electrode; a first oxide semiconductor film over the first gate electrode with the first insulating film interposed therebetween; and a channel protective film over the first oxide semiconductor film, the channel protective film having a taper shape; a pair of electrodes formed over the first oxide semiconductor film and the channel protective film, wherein each of the pair of electrodes comprises a titanium film over an upper surface of the first oxide semiconductor film and a second conductive film comprising aluminum or an aluminum alloy formed on the titanium film, and wherein one of the pair of electrodes is in contact with a side surface of the first oxide semiconductor film and the other one of the pair of electrodes is in contact with a side surface of the first oxide semiconductor film; a passivation film formed over at least the first oxide semiconductor film and the pair of electrodes; a pixel electrode formed over the passivation film and electrically connected to the first thin film transistor; a first driver circuit electrically connected to the first thin film transistor; a second driver circuit electrically connected to the first thin film transistor; wherein at least one of the first and second driver circuits comprises a second thin film transistor, the second thin film transistor including; a second gate electrode over the substrate; a second insulating film over the second gate electrode; and a second oxide semiconductor film over the second gate electrode with the second insulating film interposed therebetween, and wherein at least one of a channel region of the first oxide semiconductor film and a channel region of the second oxide semiconductor film comprises an oxide semiconductor comprising zinc and indium. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. An active matrix liquid crystal display device comprising:
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a first thin film transistor formed over a substrate, the first thin film transistor including; a first gate electrode over the substrate; a first insulating film over the first gate electrode; a first oxide semiconductor film over the first gate electrode with the first insulating film interposed therebetween; and a channel protective film over the first oxide semiconductor film, the channel protective film having a taper shape; a pair of electrodes formed over the first oxide semiconductor film and the channel protective film, wherein one of the pair of electrodes is in contact with a side surface of the first oxide semiconductor film and the other one of the pair of electrodes is in contact with a side surface of the first oxide semiconductor film; a passivation film formed over at least the first oxide semiconductor film and the pair of electrodes; a pixel electrode formed over the passivation film and electrically connected to the first thin film transistor; a scanning line driver circuit electrically connected to the first gate electrode; a signal line driver circuit electrically connected to one of the pair of electrodes wherein the signal line driver circuit is mounted by one of a COG method and a TAB method; wherein the scanning line driver circuit comprises a second thin film transistor, the second thin film transistor including; a second gate electrode over the substrate; a second insulating film over the second gate electrode; and a second oxide semiconductor film over the second gate electrode with the second insulating film interposed therebetween, and wherein at least one of a channel region of the first oxide semiconductor film and a channel region of the second oxide semiconductor film has crystallinity and comprises an oxide semiconductor comprising zinc and indium. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
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53. An active matrix liquid crystal display device comprising:
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a gate electrode over a substrate; an insulating film over the gate electrode; an oxide semiconductor film over the gate electrode with the insulating film interposed therebetween; a channel protective film over the oxide semiconductor film, the channel protective film having a taper shape; a pair of transparent conductive oxide films over and in contact with the oxide semiconductor film, wherein one of the pair of transparent conductive oxide films is in contact with a side surface of the oxide semiconductor film and the other one of the pair of transparent conductive oxide films is in contact with a side surface of the oxide semiconductor film; a source electrode and a drain electrode formed over the pair of transparent conductive oxide films; a passivation film comprising an insulating material formed over at least the source electrode, the drain electrode, and the oxide semiconductor film; and a pixel electrode formed over the passivation film and electrically connected to one of the source electrode and the drain electrode, wherein a channel region of the oxide semiconductor film has crystallinity and comprises an oxide semiconductor comprising zinc and indium, and wherein at least the channel region of the oxide semiconductor film is substantially intrinsic. - View Dependent Claims (54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64)
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65. An active matrix liquid crystal display device comprising:
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a first thin film transistor formed over a substrate, the first thin film transistor including; a first gate electrode over the substrate; a first insulating film over the first gate electrode; a first oxide semiconductor film over the first gate electrode with the first insulating film interposed therebetween; and a channel protective film over the first oxide semiconductor film, the channel protective film having a taper shape; a pair of transparent conductive oxide films over the first oxide semiconductor film and the channel protective film, wherein one of the pair of transparent conductive oxide films is in contact with a side surface of the first oxide semiconductor film and the other one of the pair of transparent conductive oxide films is in contact with a side surface of the first oxide semiconductor film; a pair of electrodes formed over the pair of transparent conductive oxide films, wherein each of the pair of electrodes comprises a titanium film over an upper surface of the first oxide semiconductor film; a passivation film formed over at least the first oxide semiconductor film and the pair of electrodes; a pixel electrode formed over the passivation film and electrically connected to the first thin film transistor; a first driver circuit electrically connected to the first thin film transistor; a second driver circuit electrically connected to the first thin film transistor; wherein at least one of the first and second driver circuits comprises a second thin film transistor, the second thin film transistor including; a second gate electrode over the substrate; a second insulating film over the second gate electrode; and a second oxide semiconductor film over the second gate electrode with the second insulating film interposed therebetween, wherein at least a channel region of the first oxide semiconductor film is substantially intrinsic, and wherein each of the channel region of the first oxide semiconductor film and a channel region of the second oxide semiconductor film comprises an oxide semiconductor comprising zinc and indium. - View Dependent Claims (66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77)
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78. An active matrix liquid crystal display device comprising:
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a first thin film transistor formed over a substrate, the first thin film transistor including; a first gate electrode over the substrate; a first insulating film over the first gate electrode; a first oxide semiconductor film over the first gate electrode with the first insulating film interposed therebetween; and a channel protective film over the first oxide semiconductor film, the channel protective film having a taper shape; a pair of electrodes formed over the first oxide semiconductor film and the channel protective film, wherein one of the pair of electrodes is in contact with a side surface of the first oxide semiconductor film and the other one of the pair of electrodes is in contact with a side surface of the first oxide semiconductor film; a passivation film formed over at least the first oxide semiconductor film and the pair of electrodes; a pixel electrode formed over the passivation film and electrically connected to the first thin film transistor; a scanning line driver circuit electrically connected to the first gate electrode; a signal line driver circuit electrically connected to one of the pair of electrodes wherein the signal line driver circuit is mounted by one of a COG method and a TAB method; wherein the scanning line driver circuit comprises a second thin film transistor, the second thin film transistor including; a second gate electrode over the substrate; a second insulating film over the second gate electrode; and a second oxide semiconductor film over the second gate electrode with the second insulating film interposed therebetween, wherein each of the pair of electrodes is in contact with the first oxide semiconductor film, wherein at least a channel region of the first oxide semiconductor film is substantially intrinsic, and wherein each of the channel region of the first oxide semiconductor film and a channel region of the second oxide semiconductor film comprises an oxide semiconductor comprising zinc and indium. - View Dependent Claims (79, 80, 81, 82, 83, 84, 85, 86, 87, 88)
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89. An active matrix liquid crystal display device comprising:
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a first thin film transistor formed over a substrate, the first thin film transistor including; a first gate electrode over the substrate; a first insulating film adjacent to the first gate electrode; a first oxide semiconductor film adjacent to the first gate electrode with the first insulating film interposed therebetween; and a channel protective film over the first oxide semiconductor film, the channel protective film having a taper shape; a pair of transparent conductive oxide films over the first oxide semiconductor film and the channel protective film, wherein one of the pair of transparent conductive oxide films is in contact with a side surface of the first oxide semiconductor film and the other one of the pair of transparent conductive oxide films is in contact with a side surface of the first oxide semiconductor film; a pair of electrodes formed over the pair of transparent conductive oxide films wherein each of the pair of electrodes comprises a titanium film over an upper surface of the first oxide semiconductor film; a passivation film formed over at least the first oxide semiconductor film and the pair of electrodes; a pixel electrode fowled over the passivation film and electrically connected to the first thin film transistor; a first driver circuit electrically connected to the first thin film transistor; a second driver circuit electrically connected to the first thin film transistor; wherein at least one of the first and second driver circuits comprises a second thin film transistor, the second thin film transistor including; a second gate electrode over the substrate; a second insulating film adjacent to the second gate electrode; and a second oxide semiconductor film adjacent to the second gate electrode with the second insulating film interposed therebetween, wherein at least one of a channel region of the first oxide semiconductor film and a channel region of the second oxide semiconductor film comprises an oxide semiconductor comprising zinc and indium. - View Dependent Claims (90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101)
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102. An active matrix liquid crystal display device comprising:
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a first thin film transistor formed over a substrate, the first thin film transistor including; a first gate electrode over the substrate; a first insulating film adjacent to the first gate electrode; and a first oxide semiconductor film adjacent to the first gate electrode with the first insulating film interposed therebetween, a channel protective film over the first oxide semiconductor film, the channel protective film having a taper shape; a pair of electrodes formed over the first oxide semiconductor film and the channel protective film, wherein one of the pair of electrodes is in contact with a side surface of the first oxide semiconductor film and the other one of the pair of electrodes is in contact with a side surface of the first oxide semiconductor film; a passivation film formed over at least the first oxide semiconductor film and the pair of electrodes; a pixel electrode formed over the passivation film and electrically connected to the first thin film transistor; a scanning line driver circuit electrically connected to the first gate electrode; a signal line driver circuit electrically connected to one of the pair of electrodes wherein the signal line driver circuit is mounted by one of a COG method and a TAB method; wherein the scanning line driver circuit comprises a second thin film transistor, the second thin film transistor including; a second gate electrode over the substrate; a second insulating film adjacent to the second gate electrode; and a second oxide semiconductor film adjacent to the second gate electrode with the second insulating film interposed therebetween, wherein at least one of a channel region of the first oxide semiconductor film and a channel region of the second oxide semiconductor film comprises an oxide semiconductor comprising zinc and indium. - View Dependent Claims (103, 104, 105, 106, 107, 108, 109, 110, 111, 112)
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113. An active matrix liquid crystal display device comprising:
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a first thin film transistor formed over a substrate, the first thin film transistor including; a first gate electrode over the substrate; a first insulating film adjacent to the first gate electrode; a first oxide semiconductor film adjacent to the first gate electrode with the first insulating film interposed therebetween; and a channel protective film over the first oxide semiconductor film, the channel protective film having a taper shape; a pair of transparent conductive oxide films over the first oxide semiconductor film and the channel protective film, wherein one of the pair of transparent conductive oxide films is in contact with a side surface of the first oxide semiconductor film and the other one of the pair of transparent conductive oxide films is in contact with a side surface of the first oxide semiconductor film; a pair of electrodes formed over the pair of transparent conductive oxide films wherein each of the pair of electrodes comprises a titanium film over an upper surface of the first oxide semiconductor film; a passivation film formed over at least the first oxide semiconductor film and the pair of electrodes; a pixel electrode formed over the passivation film and electrically connected to the first thin film transistor; a first driver circuit electrically connected to the first thin film transistor; a second driver circuit electrically connected to the first thin film transistor; wherein at least one of the first and second driver circuits comprises a second thin film transistor, the second thin film transistor including; a second gate electrode over the substrate; a second insulating film adjacent to the second gate electrode; and a second oxide semiconductor film adjacent to the second gate electrode with the second insulating film interposed therebetween, wherein at least a channel region of the first oxide semiconductor film is substantially intrinsic, and wherein each of the channel region of the first oxide semiconductor film and a channel region of the second oxide semiconductor film has crystallinity and comprises an oxide semiconductor comprising zinc and indium. - View Dependent Claims (114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125)
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126. An active matrix liquid crystal display device comprising:
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a first thin film transistor formed over a substrate, the first thin film transistor including; a first gate electrode over the substrate; a first insulating film adjacent to the first gate electrode; and a first oxide semiconductor film adjacent to the first gate electrode with the first insulating film interposed therebetween; and a channel protective film over the first oxide semiconductor film, the channel protective film having a taper shape; a pair of electrodes formed over the first oxide semiconductor film and the channel protective film, wherein one of the pair of electrodes is in contact with a side surface of the first oxide semiconductor film and the other one of the pair of electrodes is in contact with a side surface of the first oxide semiconductor film; a passivation film formed over at least the first oxide semiconductor film and the pair of electrodes; a pixel electrode formed over the passivation film and electrically connected to the first thin film transistor; a scanning line driver circuit electrically connected to the first gate electrode; a signal line driver circuit electrically connected to one of the pair of electrodes wherein the signal line driver circuit is mounted by one of a COG method and a TAB method; wherein the scanning line driver circuit comprises a second thin film transistor, the second thin film transistor including; a second gate electrode over the substrate; a second insulating film adjacent to the second gate electrode; and a second oxide semiconductor film adjacent to the second gate electrode with the second insulating film interposed therebetween, wherein each of the pair of electrodes is in contact with the first oxide semiconductor film, wherein at least a channel region of the first oxide semiconductor film is substantially intrinsic, and wherein each of the channel region of the first oxide semiconductor film and a channel region of the second oxide semiconductor film comprises an oxide semiconductor comprising zinc and indium. - View Dependent Claims (127, 128, 129, 130, 131, 132, 133, 134, 135, 136)
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Specification