Thin film transistor having plural semiconductive oxides, thin film transistor array panel and display device including the same, and manufacturing method of thin film transistor
First Claim
1. A semiconductive device comprising:
- a gate electrode;
a gate insulating layer;
a first semiconductive oxide layer comprising a first composition that includes a first semiconductive oxide;
a second semiconductive oxide layer comprising a second composition that is different from the first composition and includes the first or a different second semiconductive oxide and that further includes at least one additional component that is not included in the first composition,where the first and second semiconductive oxide layers overlap with one another in a common overlapping region of both, where the gate electrode insulatively overlaps at least the common overlapping region, where the gate insulating layer is interposed between the gate electrode and the common overlapping region of the first and second semiconductive oxide layers;
a source electrode connected to at least one of the first and second semiconductive oxide layers; and
a drain electrode connected to the at least one of the first and second semiconductive oxide layers, the drain electrode being spaced apart from the source electrode,wherein the at least one additional component of the second composition includes at least one of gallium (Ga), silicon (Si), niobium (Nb), hafnium (Hf), and germanium (Ge),wherein the first semiconductive oxide layer is interposed between the gate insulating layer and the second semiconductive oxide layer, anda content of the additional component is in a range from about 1 at. % to about 30 at. % relative to the 100 atomic percent of the second composition.
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Abstract
A plural semiconductive oxides TFT (sos-TFT) provides improved electrical functionality in terms of charge-carrier mobility and/or threshold voltage variability. The sos-TFT may be used to form a thin film transistor array panel for display devices. An example sos-TFT includes: an insulated gate electrode; a first semiconductive oxide layer having a composition including a first semiconductive oxide; and a second semiconductive oxide layer having a different composition that also includes a semiconductive oxide. The first and second semiconductive oxide layers have respective channel regions that are capacitively influenced by a control voltage applied to the gate electrode. In one embodiment, the second semiconductive oxide layer includes at least one additional element that is not included in the first semiconductive oxide layer where the additional element is one of gallium (Ga), silicon (Si), niobium (Nb), hafnium (Hf), and germanium (Ge).
41 Citations
42 Claims
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1. A semiconductive device comprising:
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a gate electrode; a gate insulating layer; a first semiconductive oxide layer comprising a first composition that includes a first semiconductive oxide; a second semiconductive oxide layer comprising a second composition that is different from the first composition and includes the first or a different second semiconductive oxide and that further includes at least one additional component that is not included in the first composition, where the first and second semiconductive oxide layers overlap with one another in a common overlapping region of both, where the gate electrode insulatively overlaps at least the common overlapping region, where the gate insulating layer is interposed between the gate electrode and the common overlapping region of the first and second semiconductive oxide layers; a source electrode connected to at least one of the first and second semiconductive oxide layers; and a drain electrode connected to the at least one of the first and second semiconductive oxide layers, the drain electrode being spaced apart from the source electrode, wherein the at least one additional component of the second composition includes at least one of gallium (Ga), silicon (Si), niobium (Nb), hafnium (Hf), and germanium (Ge), wherein the first semiconductive oxide layer is interposed between the gate insulating layer and the second semiconductive oxide layer, and a content of the additional component is in a range from about 1 at. % to about 30 at. % relative to the 100 atomic percent of the second composition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A thin film transistor array panel comprising:
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a substrate; a gate electrode disposed on the substrate; a gate insulating layer insulating the gate electrode; a first semiconductive oxide layer and a second semiconductive oxide layer that both overlap the gate electrode and are insulated from the gate electrode by the gate insulating layer, the first and second semiconductive oxide layers being electrically connected to each other; a source electrode connected to the second semiconductive oxide layer; a drain electrode connected to the second semiconductive oxide layer and being spaced apart from the source electrode; and a pixel electrode connected to the drain electrode, wherein the second semiconductive oxide layer includes in operationally effective concentration at least one additional element not included in the first semiconductive oxide layer, the at least one additional element is one of gallium (Ga), silicon (Si), niobium (Nb), hafnium (Hf), and germanium (Ge), wherein the first semiconductive oxide layer is interposed between the gate insulating layer and the second semiconductive oxide layer, and a content of the additional element is in a range from about 1 at. % to about 30 at. % relative to the 100 atomic percent composition of the second semiconductive oxide laver. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A display device comprising:
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a substrate; a gate electrode positioned on the substrate; a gate insulating layer positioned on or under the gate electrode; a first semiconductive oxide and a second semiconductive oxide that both insulatively overlap with the gate electrode and contact each other; a source electrode connected to the second semiconductive oxide; a drain electrode connected to the second semiconductive oxide; and a pixel electrode connected to the drain electrode, wherein the second semiconductive oxide includes at least one additional element that is not included in the first semiconductive oxide, the at least one additional element is one of gallium (Ga), silicon (Si), niobium (Nb), hafnium (Hf), and germanium (Ge), wherein the first semiconductive oxide layer is interposed between the gate insulating layer and the second semiconductive oxide layer, and a content of the at least one additional element is in a range from about 1 at. % to about 30 at. % of the content of the second semiconductive oxide. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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Specification