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Provided is a thin film transistor and thin film transistor panel array. The thin film transistor includes: a substrate; a gate electrode disposed on the substrate; a semiconductor layer disposed on the substrate and partially overlapping with the gate electrode; a source electrode and a drain elect

Provided is a thin film transistor and thin film transistor panel array. The thin film transistor includes: a substrate; a gate electrode disposed on the substrate; a semiconductor layer disposed on the substrate and partially overlapping with the gate electrode; a source electrode and a drain electrode spaced apart from each other with respect to a channel region of the semiconductor layer; an insulating layer disposed between the gate electrode and the semiconductor layer; and a barrier layer disposed between the semiconductor layer and the source electrode and between the semiconductor layer and the drain electrode, in which the barrier layer comprises graphene. An ohmic contact is provided based on the type of material used for the semiconductor layer.

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1. A thin film transistor, comprising: a substrate;a gate electrode disposed on the substrate;a semiconductor layer disposed on the substrate, the semiconductor layer having a channel region;a source electrode and a drain electrode spaced apart from each other with respect to the channel region of t

1. A thin film transistor, comprising: a substrate;a gate electrode disposed on the substrate;a semiconductor layer disposed on the substrate, the semiconductor layer having a channel region;a source electrode and a drain electrode spaced apart from each other with respect to the channel region of the semiconductor layer;an insulating layer disposed between the gate electrode and the semiconductor layer; anda barrier layer disposed between the semiconductor layer and the source electrode and between the semiconductor layer and the drain electrode,wherein the barrier layer comprises graphene, andwherein the barrier layer and the semiconductor layer face each other in a direction perpendicular to the substrate. 2. The thin film transistor of claim 1, further comprising: a capping layer disposed on the source electrode and the drain electrode. 3. The thin film transistor of claim 2, wherein: the capping layer comprises graphene. 4. The thin film transistor of claim 3, wherein: the barrier layer contacts the source electrode and the drain electrode. 5. The thin film transistor of claim 4, further comprising: a passivation layer disposed on the capping layer. 6. The thin film transistor of claim 5, wherein: the passivation layer contacts an upper surface of the semiconductor layer corresponding to the channel region. 7. The thin film transistor of claim 3, wherein: the semiconductor layer comprises an oxide semiconductor. 8. The thin film transistor of claim 7, wherein: the semiconductor layer comprises at least one of zinc (Zn), indium (In), tin (Sn), gallium (Ga), and hafnium (Hf). 9. The thin film transistor of claim 3, wherein: the semiconductor layer comprises amorphous silicon. 10. The thin film transistor of claim 9, further comprising: an ohmic contact layer disposed between the semiconductor layer and the barrier layer. 11. The thin film transistor of claim 3, wherein: the source electrode and the drain electrode comprisea lower layer comprising at least one of copper, manganese, and titanium andan upper layer disposed on the lower layer, and the upper layer comprising copper. 12. A thin film transistor array panel, comprising: a substrate;a gate line disposed on the substrate and a gate electrode, the gate line and the gate electrode being connected to each other;a gate insulating layer disposed on the gate line and the gate electrode;a semiconductor layer disposed on the gate insulating layer;a data line disposed on the semiconductor layer and a source electrode connected to the data line;a drain electrode spaced apart from the source electrode;a passivation layer disposed on the data line, the source electrode, and the drain electrode and having a contact hole;a pixel electrode disposed on the passivation layer and connected to the drain electrode through the contact hole; anda barrier layer disposed between the semiconductor layer and the source electrode, and between the semiconductor layer and the drain electrode,wherein the barrier layer comprises graphene. 13. The thin film transistor array panel of claim 12, further comprising: a capping layer disposed between the source electrode and the passivation layer and between the drain electrode and the passivation layer. 14. The thin film transistor array panel of claim 13, wherein: the capping layer comprises graphene. 15. The thin film transistor array panel of claim 14, wherein: the barrier layer contacts the source electrode and the drain electrode. 16. The thin film transistor array panel of claim 15, wherein: the passivation layer contacts an upper surface of the semiconductor layer, the semiconductor layer having a channel region. 17. The thin film transistor array panel of claim 14, wherein: the semiconductor layer comprises an oxide semiconductor. 18. The thin film transistor array panel of claim 17, wherein: the semiconductor layer comprises at least one of zinc (Zn), indium (In), tin (Sn), gallium (Ga), and hafnium (Hf). 19. The thin film transistor array panel of claim 14, wherein: the semiconductor layer comprises amorphous silicon. 20. The thin film transistor array panel of claim 19, further comprising: an ohmic contact layer disposed between the semiconductor layer and the barrier layer. 21. The thin film transistor array panel of claim 12, wherein: the source electrode and the drain electrode comprise:a lower layer comprising at least one of copper, manganese, and titanium andan upper layer disposed on the lower layer, the upper layer comprising copper.