Thin-film transistor fabrication process and display device
First Claim
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1. A process for fabricating a thin-film transistor in which a gate electrode is to be formed on a substrate, the process comprising the steps of:
- forming the gate electrode on the substrate;
forming a metal oxide layer in such a way as to cover the gate electrode said metal oxide layer comprising Zn and further comprising at least one of In, Ga, Al, Fe, Sn, Mg, Ca, Si, and Ge, having a resistivity of from 108 cm or more to 1010 Ω
cm or less, and being amorphous;
thereafterforming a source electrode and a drain electrode;
carrying out heat treatment to the source electrode and the drain electrode at a temperature in the range from 150°
C. to 250°
C. by using any one of an ultraviolet lamp, a visible-light lamp, an infrared lamp, a near infrared lamp, and a far infrared lamp in a gas selected from the group consisting of N2, Kr, and Xe to change a first part of the metal oxide layer into a channel region,wherein after the heat treatment, the channel region is amorphous and has a resistivity of from 10 Ω
cm or more to 107 Ω
cm or less;
wherein the heat treatment is subjected to the first part of the metal oxide layer, and wherein the heat treatment is not subjected to a second part of the metal oxide layer; and
wherein the second part of the metal oxide layer is located outside the first part of the metal oxide layer.
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Abstract
In a process for fabricating a thin-film transistor in which a gate electrode 4 is to be formed on a substrate 1, the process has the steps of forming the gate electrode 4 on the substrate 1, forming a metal oxide layer 7 in such a way as to cover the gate electrode 4, forming a source electrode 6 and a drain electrode 5, and carrying out annealing in an inert gas to change part of the metal oxide layer 7 into a channel region.
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2 Claims
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1. A process for fabricating a thin-film transistor in which a gate electrode is to be formed on a substrate, the process comprising the steps of:
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forming the gate electrode on the substrate; forming a metal oxide layer in such a way as to cover the gate electrode said metal oxide layer comprising Zn and further comprising at least one of In, Ga, Al, Fe, Sn, Mg, Ca, Si, and Ge, having a resistivity of from 108 cm or more to 1010 Ω
cm or less, and being amorphous;
thereafterforming a source electrode and a drain electrode; carrying out heat treatment to the source electrode and the drain electrode at a temperature in the range from 150°
C. to 250°
C. by using any one of an ultraviolet lamp, a visible-light lamp, an infrared lamp, a near infrared lamp, and a far infrared lamp in a gas selected from the group consisting of N2, Kr, and Xe to change a first part of the metal oxide layer into a channel region,wherein after the heat treatment, the channel region is amorphous and has a resistivity of from 10 Ω
cm or more to 107 Ω
cm or less;wherein the heat treatment is subjected to the first part of the metal oxide layer, and wherein the heat treatment is not subjected to a second part of the metal oxide layer; and wherein the second part of the metal oxide layer is located outside the first part of the metal oxide layer. - View Dependent Claims (2)
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Specification