Thin-film transistor, substrate and display device each having the thin-film transistor, and method of manufacturing the thin-film transistor
First Claim
Patent Images
1. A thin-film transistor (TFT) comprising:
- a gate electrode;
a semiconductor pattern comprising an active layer being overlapped with the gate electrode and a low band gap portion having a lower energy band gap than the active layer, wherein the low band gap portion comprises a plurality of nanocrystals; and
a source electrode and a drain electrode being spaced apart from each other to be overlapped with the semiconductor pattern.
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Abstract
A thin-film transistor (TFT) includes a gate electrode, a semiconductor pattern, a source electrode, and a drain electrode. The semiconductor pattern includes an active layer being overlapped with the gate electrode and a low band gap portion having a lower energy band gap than the active layer. The source and drain electrodes are spaced apart from each other to be overlapped with the semiconductor pattern. Therefore, the semiconductor pattern includes a low band gap portion having a lower energy band gap than the active layer, so that electron mobility may be increased in a channel formed along the low band gap portion so that electric characteristics of the TFT may be enhanced.
10 Citations
21 Claims
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1. A thin-film transistor (TFT) comprising:
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a gate electrode; a semiconductor pattern comprising an active layer being overlapped with the gate electrode and a low band gap portion having a lower energy band gap than the active layer, wherein the low band gap portion comprises a plurality of nanocrystals; and a source electrode and a drain electrode being spaced apart from each other to be overlapped with the semiconductor pattern. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of manufacturing a thin-film transistor (TFT), the method comprising:
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forming a gate electrode; forming a semiconductor pattern comprising an active layer being overlapped with the gate electrode and a low band gap portion having a lower energy band gap than the active layer, wherein forming the low band gap portion further comprises depositing silicon or germanium to form a plurality of nanocrystals; and forming a source electrode and a drain electrode that are spaced apart from each other to be overlapped with the semiconductor pattern. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A thin-film transistor (TFT) substrate comprising:
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a base substrate; a plurality of TFTs comprising; a gate electrode; a semiconductor pattern comprising an active layer being overlapped with the gate electrode and a low band gap portion having a low energy band gap than the active layer, wherein the low band gap portion comprises a plurality of nanocrystals; and a source electrode and a drain electrode that are spaced apart from each other to be overlapped with the semiconductor pattern; a passivation layer covering the TFT to protect the TFT; and a plurality of pixel electrodes formed on the passivation layer to be electrically connected to the TFT through a plurality of contact holes of the passivation layer. - View Dependent Claims (20)
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21. A display device comprising:
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a thin-film transistor (TFT) substrate; an opposite substrate opposite to the TFT substrate; and a liquid crystal layer disposed between the TFT substrate and the opposite substrate, wherein the TFT substrate comprises; a base substrate; a plurality of TFTs comprising a gate electrode, a semiconductor pattern comprising an active layer being overlapped with the gate electrode and a low band gap portion having a low energy band gap than the active layer, and a source electrode and a drain electrode that are spaced apart from each other to be overlapped with the semiconductor pattern; a passivation layer covering the TFT to protect the TFT; and a plurality of pixel electrodes formed on the passivation layer to be electrically connected to the TFT through a plurality of contact holes of the passivation layer; wherein the low band gap portion comprises a plurality of nanocrystals.
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Specification