WO2010035463A1 - 薄膜トランジスター及び薄膜トランジスター中間体 - Google Patents
薄膜トランジスター及び薄膜トランジスター中間体 Download PDFInfo
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- WO2010035463A1 WO2010035463A1 PCT/JP2009/004822 JP2009004822W WO2010035463A1 WO 2010035463 A1 WO2010035463 A1 WO 2010035463A1 JP 2009004822 W JP2009004822 W JP 2009004822W WO 2010035463 A1 WO2010035463 A1 WO 2010035463A1
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- film
- copper alloy
- oxygen
- thin film
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- 239000010409 thin film Substances 0.000 title claims abstract description 217
- 239000010408 film Substances 0.000 claims abstract description 603
- 229910000881 Cu alloy Inorganic materials 0.000 claims abstract description 303
- 239000011575 calcium Substances 0.000 claims abstract description 166
- 239000002131 composite material Substances 0.000 claims abstract description 133
- 239000010949 copper Substances 0.000 claims abstract description 105
- 229910052787 antimony Inorganic materials 0.000 claims abstract description 104
- 229910052718 tin Inorganic materials 0.000 claims abstract description 103
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 100
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 98
- 239000001301 oxygen Substances 0.000 claims abstract description 98
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 98
- 230000004888 barrier function Effects 0.000 claims abstract description 80
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 67
- 239000000758 substrate Substances 0.000 claims abstract description 63
- 239000012535 impurity Substances 0.000 claims abstract description 45
- 229910021417 amorphous silicon Inorganic materials 0.000 claims description 91
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 62
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 60
- 239000011521 glass Substances 0.000 claims description 53
- 239000004065 semiconductor Substances 0.000 claims description 39
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 28
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 27
- 229910052802 copper Inorganic materials 0.000 abstract description 36
- 239000000543 intermediate Substances 0.000 description 146
- 239000000203 mixture Substances 0.000 description 60
- 238000004544 sputter deposition Methods 0.000 description 56
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 40
- 239000001257 hydrogen Substances 0.000 description 39
- 229910052739 hydrogen Inorganic materials 0.000 description 39
- 238000009832 plasma treatment Methods 0.000 description 37
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 34
- 239000007789 gas Substances 0.000 description 24
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 22
- 230000000052 comparative effect Effects 0.000 description 18
- 229910045601 alloy Inorganic materials 0.000 description 17
- 239000000956 alloy Substances 0.000 description 17
- 229910052791 calcium Inorganic materials 0.000 description 17
- 239000011261 inert gas Substances 0.000 description 16
- 239000002184 metal Substances 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 11
- 238000000926 separation method Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 10
- 239000000843 powder Substances 0.000 description 10
- 238000004458 analytical method Methods 0.000 description 9
- 230000002159 abnormal effect Effects 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 229910001868 water Inorganic materials 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000000919 ceramic Substances 0.000 description 5
- 239000000523 sample Substances 0.000 description 5
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 150000002431 hydrogen Chemical class 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- -1 hydroxide ions Chemical class 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- 239000000378 calcium silicate Substances 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009689 gas atomisation Methods 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005240 physical vapour deposition Methods 0.000 description 2
- 238000005546 reactive sputtering Methods 0.000 description 2
- 229910001182 Mo alloy Inorganic materials 0.000 description 1
- 229910052774 Proactinium Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- KSMZJONTGCRDPO-UHFFFAOYSA-N [O].[Ca].[Cu] Chemical compound [O].[Ca].[Cu] KSMZJONTGCRDPO-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 238000001020 plasma etching Methods 0.000 description 1
- 238000001275 scanning Auger electron spectroscopy Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/43—Electrodes ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/45—Ohmic electrodes
- H01L29/456—Ohmic electrodes on silicon
- H01L29/458—Ohmic electrodes on silicon for thin film silicon, e.g. source or drain electrode
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66227—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/66742—Thin film unipolar transistors
- H01L29/6675—Amorphous silicon or polysilicon transistors
- H01L29/66765—Lateral single gate single channel transistors with inverted structure, i.e. the channel layer is formed after the gate
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/78606—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device
- H01L29/78618—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device characterised by the drain or the source properties, e.g. the doping structure, the composition, the sectional shape or the contact structure
- H01L29/78621—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device characterised by the drain or the source properties, e.g. the doping structure, the composition, the sectional shape or the contact structure with LDD structure or an extension or an offset region or characterised by the doping profile
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/78651—Silicon transistors
- H01L29/7866—Non-monocrystalline silicon transistors
- H01L29/78663—Amorphous silicon transistors
- H01L29/78669—Amorphous silicon transistors with inverted-type structure, e.g. with bottom gate
Definitions
- the present invention relates to a thin film transistor used for various displays and a thin film transistor intermediate for producing the transistor, and more particularly to a thin film transistor and a thin film transistor intermediate having a drain electrode and a source electrode excellent in adhesion.
- Liquid crystal displays, plasma displays, organic EL displays, inorganic EL displays and the like are known as flat panel displays using thin film transistors driven by an active matrix method.
- wiring made of a metal film is formed in close contact with the surface of the glass substrate, and thin film transistors are provided at the intersections of the grid wiring made of the metal film.
- the thin film transistor is formed on the gate electrode film 2 made of a pure copper film formed on the surface of the glass substrate 1 and on the gate electrode film 2 and the glass substrate 1 as shown in the schematic cross-sectional explanatory view of FIG. an amorphous Si semiconductor film 4, the n - - silicon nitride (SiN x) film 3, n formed on the silicon nitride (SiN x) film 3 is formed on the amorphous Si semiconductor film 4 An n + amorphous Si ohmic film 4 ′, and a drain electrode film 5 and a source electrode film 6 made of pure copper formed on the n + amorphous Si ohmic film 4 ′ are included.
- a gate electrode film 2 made of pure copper is formed on the surface of a glass substrate 1 as shown in the sectional view of FIG. 2 and a silicon nitride (SiN x) film 3 is formed on the glass substrate 1, further n on the silicon nitride (SiN x) film 3 - amorphous Si semiconductor film 4 is formed, the n - amorphous Si semiconductor film An n + amorphous Si ohmic film 4 ′ is formed on 4, and a pure copper film 8 is formed so as to cover the entire surface of the n + amorphous Si ohmic film 4 ′.
- the pure copper film 8 immediately above the gate electrode 2 of the stacked body 9 shown in FIG. 6 is wet-etched, and the n + amorphous Si ohmic film 4 ′ is plasma-etched. Thus forming a separation groove 7 n - exposing the amorphous Si semiconductor film 4. Thereby, the drain electrode film 5 and the source electrode film 6 are formed. Thus, the conventional thin film transistor intermediate 10 shown in the cross-sectional view of FIG. 5 is produced.
- separating n grooves 7 are exposed to form - the surface of the amorphous Si semiconductor film 4 and the hydrogen plasma treatment, by the hydrogen plasma treatment, n - the surface of the amorphous Si semiconductor film 4
- the hydrogen plasma treatment is performed by gas: 100% hydrogen gas, hydrogen gas flow rate: 10 to 1000 SCCM, hydrogen gas pressure: 10 to 500 Pa, RF current density: 0.005 to 0.5 W / cm 2 , treatment time: 1 to It is said that it is good to carry out on the conditions for 60 minutes (refer patent document 1).
- Si in the n + amorphous Si ohmic film 4 ′ diffuses into the drain electrode film 5 and the source electrode film 6 to increase the specific resistance of the drain electrode film 5 and the source electrode film 6.
- a barrier film is formed between the n + amorphous Si ohmic film 4 ′ and the drain electrode film 5 and between the n + amorphous Si ohmic film 4 ′ and the source electrode film 6. It is known that a Mo or Mo alloy film or a Ti or Ti alloy film is usually used as the barrier film (see Patent Document 2).
- a pure copper film is often used for the drain electrode film 5 and the source electrode film 6, but the pure copper film has low adhesion to a ceramic substrate made of glass, alumina, or silicon dioxide.
- a copper film containing oxygen is first formed as a base film on the surface of the ceramic substrate, and a pure copper film is formed on the base film made of the copper film containing oxygen.
- a technique for obtaining a composite copper film is also known (see Patent Document 3).
- the composite copper film the copper film containing oxygen is in contact with the ceramic substrate, whereby adhesion to the ceramic substrate can be improved.
- n - hydrogen plasma treatment step necessary step to stabilize the dangling bonds of the surface of the amorphous Si semiconductor film 4 (dangling bonds) is bonded to hydrogen atom It is.
- this hydrogen plasma treatment is performed, the adhesion of the drain electrode film and the source electrode film made of a pure copper film to the n + amorphous Si ohmic film 4 ′ is lowered.
- a conventional copper film containing oxygen is used as a base layer, and a composite copper film in which a pure copper film is formed on this base layer is formed as a drain electrode film and a source. I tried to use it as an electrode film.
- the composite copper film after the hydrogen plasma treatment still does not provide sufficient adhesion to the n + amorphous Si ohmic film 4 ′, which may cause peeling and cause a thin film transistor failure. I understood.
- An object of the present invention is to provide a thin film transistor and a thin film transistor intermediate having a drain electrode and a source electrode excellent in adhesion.
- the present inventors have produced a thin film transistor intermediate having a drain electrode film and a source electrode film having further excellent adhesion, and using this thin film transistor intermediate, a drain electrode film and a source electrode film having further excellent adhesion. Research was carried out to produce a thin film transistor having As a result, the following research results were obtained.
- the thin film transistor intermediate 110 according to the first aspect of the present invention having the drain electrode film 5 and the source electrode film 6 having excellent adhesion shown in the sectional view of FIG. 1 can be produced by the following method.
- a silicon oxide (SiO x ) film as a barrier film rather than a metal film such as a Mo film or a Ti film conventionally known as a barrier film of a thin film transistor, the adhesion between the drain electrode film and the source electrode film is improved. Can be further improved, which is preferable. Therefore, first, as shown in the cross-sectional view of FIG. 2, the gate electrode film 2 is formed on the glass substrate 1, and the silicon nitride film 3 is formed on the glass substrate 1 and the gate electrode film 2.
- the composite copper alloy film 114 is constituted by the oxygen-calcium-containing copper alloy underlayer 112 and the Cu layer 113.
- the oxygen-calcium-containing copper alloy underlayer 112 contains Ca: 0.01 to 10 mol% and oxygen: 1 to 20 mol%, and has a component composition including Cu and inevitable impurities as the balance.
- the laminate 109 is manufactured.
- the composite copper alloy film 114 immediately above the gate electrode 2 is wet-etched, and the barrier film 11 made of the silicon oxide film and the n + amorphous Si ohmic film 4 'are plasma-etched.
- the thin film transistor intermediate body 110 of the first aspect shown in the cross-sectional view of FIG. 1 can be manufactured.
- a first embodiment of the present invention having a drain electrode film and a source electrode film having further excellent adhesion by performing a hydrogen plasma treatment on the thin film transistor intermediate 110 of the first embodiment shown in FIG.
- the thin film transistor can be manufactured.
- a concentrated layer having higher Ca and oxygen concentrations is formed in the oxygen-calcium-containing copper alloy underlayer 112.
- This concentrated layer contains Ca: 2 to 30 mol% and oxygen: 20 to 50 mol%, and has a component composition including Cu and inevitable impurities as the balance.
- the oxygen-calcium-containing copper alloy underlayer 112 is changed to an oxygen-calcium-enriched layer-containing copper alloy underlayer (not shown) having this concentrated layer, and the oxygen-calcium-enriched layer-containing copper alloy underlayer and Cu A composite copper alloy film composed of layers is formed. Since the drain electrode film and the source electrode film have the composite copper alloy film composed of the oxygen-calcium enriched layer-containing copper alloy underlayer and the Cu layer, adhesion to the barrier film 11 is remarkably improved.
- the thin film transistor intermediate 210 of the second aspect of the present invention having the drain electrode film 5 and the source electrode film 6 having excellent adhesion shown in the cross-sectional view of FIG. 3 can be produced by the following method.
- a silicon oxide (SiO x ) film as a barrier film rather than a metal film such as a Mo film or a Ti film conventionally known as a barrier film of a thin film transistor, the adhesion between the drain electrode film and the source electrode film is improved. Can be further improved, which is preferable. Therefore, first, as shown in the cross-sectional view of FIG. 4, a gate electrode film 2 is formed on the glass substrate 1, and a silicon nitride film 3 is formed on the glass substrate 1 and the gate electrode film 2.
- the on the silicon nitride film 3 n - to form an amorphous Si semiconductor film 4 the n - amorphous Si semiconductor film n + amorphous Si ohmic film 4 'is formed on the 4, the n + amorphous Si ohmic film
- a barrier film 11 made of a silicon oxide (SiO x ) film is formed on 4 ′.
- an oxygen-Ca (Al, Sn, Sb) copper alloy intermediate underlayer 212 is formed on the barrier film 11 made of the silicon oxide (SiO x ) film, and the oxygen-Ca (Al, Sn, Sb)
- a Cu alloy layer 213 is formed on the copper alloy intermediate base layer 212.
- This oxygen-Ca (Al, Sn, Sb) copper alloy intermediate underlayer 212 and Cu alloy layer 213 constitute a composite copper alloy film 214.
- the oxygen-Ca (Al, Sn, Sb) copper alloy intermediate underlayer 212 is composed of Ca: 0.2 to 10 mol%, one or more selected from Al, Sn, and Sb in a total of 0.001.
- a copper alloy underlayer having a component composition containing 05 to 2 mol% and oxygen: 1 to 20 mol% and containing Cu and unavoidable impurities as the balance hereinafter referred to as a “copper alloy underlayer having this component composition” Ca (Al, Sn, Sb) copper alloy intermediate underlayer ”).
- the stacked body 209 is manufactured.
- the composite copper alloy film 214 immediately above the gate electrode 2 is wet-etched, and the barrier film 11 made of the silicon oxide film and the n + amorphous Si ohmic film 4 ′ are plasma-etched.
- the thin film transistor intermediate 210 of the second embodiment shown in the cross-sectional view of FIG. 3 can be manufactured.
- the second embodiment of the present invention having a drain electrode film and a source electrode film having further excellent adhesion by performing a hydrogen plasma treatment on the thin film transistor intermediate 210 of the second embodiment shown in FIG.
- the thin film transistor can be manufactured.
- the concentrations of Ca, Al, Sn, Sb and oxygen in the oxygen-Ca (Al, Sn, Sb) copper alloy intermediate underlayer 212 are increased.
- a higher concentrated layer is formed.
- This concentrated layer contains Ca: 2 to 30 mol%, one or more selected from Al, Sn and Sb in total, 1 to 10 mol%, and oxygen: 20 to 50 mol%, and the balance As a component composition containing Cu and inevitable impurities.
- the oxygen-Ca (Al, Sn, Sb) copper alloy intermediate underlayer 212 is converted into a copper alloy underlayer having this concentrated layer (hereinafter referred to as “oxygen-Ca (Al, (Sn, Sb) enriched layer-containing copper alloy underlayer ”(not shown), and a composite copper comprising an oxygen-Ca (Al, Sn, Sb) enriched layer-containing copper alloy underlayer and a Cu alloy layer An alloy film is formed. Since the drain electrode film and the source electrode film have a composite copper alloy film comprising the oxygen-Ca (Al, Sn, Sb) concentrated layer-containing copper alloy underlayer and Cu alloy layer, the adhesion to the barrier film 11 is remarkably high. To improve.
- a thin film transistor includes a glass substrate, a gate electrode film formed on the glass substrate, and a silicon nitride film formed on the glass substrate and the gate electrode film.
- n formed on the silicon nitride film - and the amorphous Si semiconductor film, the n - and n + amorphous Si ohmic film formed on the amorphous Si semiconductor film, on the n + amorphous Si ohmic film A barrier film made of the silicon oxide film formed, and a drain electrode film and a source electrode film formed on the barrier film made of the silicon oxide film.
- the drain electrode film and the source electrode film are formed of an oxygen-calcium enriched layer-containing copper alloy underlayer formed in contact with at least the barrier film made of the silicon oxide film, and the oxygen-calcium enriched layer-containing copper alloy underlayer. It has a composite copper alloy film comprising a Cu layer formed thereon.
- the oxygen-calcium concentrated layer-containing copper alloy underlayer has a concentrated layer. The concentrated layer contains Ca: 2 to 30 mol% and oxygen: 20 to 50 mol%, and the remainder contains Cu and inevitable impurities.
- a thin film transistor intermediate according to the first aspect of the present invention includes a glass substrate, a gate electrode film formed on the glass substrate, and silicon nitride formed on the glass substrate and the gate electrode film.
- amorphous Si semiconductor film, the n - - the film, n formed on the silicon nitride film and the n + amorphous Si ohmic film formed on the amorphous Si semiconductor film, the n + amorphous Si ohmic film A barrier film formed on the silicon oxide film; and a drain electrode film and a source electrode film formed on the barrier film formed of the silicon oxide film.
- the drain electrode film and the source electrode film are formed on the oxygen-calcium-containing copper alloy underlayer formed in contact with the barrier film made of the silicon oxide film and the oxygen-calcium-containing copper alloy underlayer. It has a composite copper alloy film composed of a Cu layer.
- the oxygen-calcium-containing copper alloy underlayer contains Ca: 0.01 to 10 mol% and oxygen: 1 to 20 mol%, and the remainder includes Cu and inevitable impurities.
- a thin film transistor includes a glass substrate, a gate electrode film formed on the glass substrate, a silicon nitride film formed on the glass substrate and the gate electrode film, , n formed on the silicon nitride film - and the amorphous Si semiconductor film, the n - and n + amorphous Si ohmic film formed on the amorphous Si semiconductor film, on the n + amorphous Si ohmic film A barrier film made of the silicon oxide film formed, and a drain electrode film and a source electrode film formed on the barrier film made of the silicon oxide film.
- the drain electrode film and the source electrode film include an oxygen-Ca (Al, Sn, Sb) enriched layer-containing copper alloy underlayer formed in contact with at least a barrier film made of the silicon oxide film, and the oxygen-Ca ( Al, Sn, Sb) having a composite copper alloy film comprising a Cu alloy layer formed on a copper alloy underlayer containing a concentrated layer.
- the oxygen-Ca (Al, Sn, Sb) concentrated layer-containing copper alloy underlayer is a copper alloy underlayer having a concentrated layer.
- the concentrated layer contains Ca: 2 to 30 mol%, one or more selected from Al, Sn and Sb in total, 1 to 10 mol%, and oxygen: 20 to 50 mol%, and the balance Cu and unavoidable impurities.
- the Cu alloy layer formed on the oxygen-Ca (Al, Sn, Sb) concentrated layer-containing copper alloy underlayer is made of Al, Sn, and Sb.
- One or two or more selected may be contained in a total amount of 0.05 to 2 mol%, and the balance may include Cu and inevitable impurities.
- the thin film transistor intermediate according to the second aspect of the present invention includes a glass substrate, a gate electrode film formed on the glass substrate, and silicon nitride formed on the glass substrate and the gate electrode film.
- amorphous Si semiconductor film, the n - - the film, n formed on the silicon nitride film and the n + amorphous Si ohmic film formed on the amorphous Si semiconductor film, the n + amorphous Si ohmic film A barrier film formed on the silicon oxide film; and a drain electrode film and a source electrode film formed on the barrier film formed of the silicon oxide film.
- the drain electrode film and the source electrode film include an oxygen-Ca (Al, Sn, Sb) copper alloy intermediate underlayer formed in contact with the barrier film made of the silicon oxide film, and the oxygen-Ca (Al , Sn, Sb) having a composite copper alloy film comprising a Cu alloy layer formed on a copper alloy intermediate underlayer.
- the oxygen-Ca (Al, Sn, Sb) copper alloy intermediate underlayer is composed of Ca: 0.2 to 10 mol%, one or more selected from Al, Sn, and Sb in a total of 0.05. It contains ⁇ 2 mol% and oxygen: 1 to 20 mol%, and the remainder contains Cu and inevitable impurities.
- the Cu alloy layer formed on the oxygen-Ca (Al, Sn, Sb) copper alloy intermediate underlayer includes Al, Sn, and Sb.
- One or two or more selected from the above may be added in a total amount of 0.05 to 2 mol%, and the balance may include Cu and inevitable impurities.
- a silicon oxide (SiO x ) film is used as the barrier film.
- a composite copper alloy film comprising an oxygen-calcium copper alloy base film containing oxygen and Ca and a Cu layer is used, so that a barrier film comprising a silicon oxide (SiO x ) film is used. Adhesion to is even better. For this reason, for example, even when vibration is applied during the transport of the thin film transistor intermediate of the first aspect, the possibility of failure due to peeling of the drain electrode film and the source electrode film is further reduced.
- the silicon oxide (SiO x ) film as the barrier film can be formed only by performing sputter sputtering on the surface of the n + amorphous Si ohmic film 4 ′, the manufacturing cost can be reduced.
- the thin film transistor according to the first aspect of the present invention is obtained by subjecting the thin film transistor intermediate according to the first aspect to hydrogen plasma treatment, and a concentrated layer containing Ca and oxygen at higher concentrations is generated.
- a concentrated layer containing Ca and oxygen at higher concentrations is generated.
- the adhesion to the barrier film made of the silicon oxide (SiO x ) film is further improved, and the thin film transistor of this first aspect is provided. Even if intense vibration is applied, there is no possibility of failure due to separation of the drain electrode film and the source electrode film.
- a silicon oxide (SiO x ) film is used as the barrier film.
- a composite copper alloy film composed of an oxygen-Ca (Al, Sn, Sb) copper alloy intermediate base film containing Ca, Al, Sn, Sb and oxygen and a Cu alloy layer is used as a drain electrode film and a source electrode film. Therefore, adhesion to a barrier film made of a silicon oxide (SiO x ) film is further excellent. For this reason, for example, even when vibration is applied during the transportation of the thin film transistor intermediate of the second aspect, the possibility of failure due to peeling of the drain electrode film and the source electrode film is further reduced. Furthermore, since the silicon oxide (SiO x ) film as the barrier film can be formed only by performing sputter sputtering on the surface of the n + amorphous Si ohmic film 4 ′, the manufacturing cost can be reduced.
- the thin film transistor of the second aspect of the present invention is obtained by subjecting the above-described thin film transistor intermediate of the second aspect to hydrogen plasma treatment, and is a concentrated layer containing Ca, Al, Sn, Sb, and oxygen at a higher concentration. Is generated.
- the oxygen-Ca (Al, Sn, Sb) enriched layer-containing copper alloy base film including the enriched layer the adhesion to the barrier film made of the silicon oxide (SiO x ) film is further improved. Even if intense vibration is applied to the thin film transistor according to the second aspect, there is no possibility of failure due to peeling of the drain electrode film and the source electrode film.
- FIG. 1 is a cross-sectional view of a thin film transistor intermediate body according to the first embodiment
- FIG. 2 is a cross-sectional view of a stacked body for producing the thin film transistor intermediate body according to the first embodiment.
- a gate electrode film 2 made of a copper film is formed on the surface of the glass substrate 1. and, the gate electrode film 2 and silicon nitride on the glass substrate 1 to form a (SiN x) film 3, further n on the silicon nitride (SiN x) film 3 - to form an amorphous Si semiconductor film 4, a barrier film 11 of n + amorphous Si ohmic film 4 'is formed on the amorphous Si semiconductor film 4, made of further silicon oxide (SiO x) film on the n + amorphous Si ohmic film 4' - wherein n To do.
- the barrier film 11 made of this silicon oxide (SiO x ) film can also be formed by ordinary PVD or CVD, but is sputtered while maintaining the atmosphere in the sputtering apparatus so as to be an inert gas atmosphere containing oxygen or oxygen. By doing so, the surface of the n + amorphous Si ohmic film 4 ′ is oxidized, and thereby the barrier film 11 can be formed.
- the oxygen-calcium-containing copper alloy underlayer 112 contains Ca: 0.01 to 10 mol% and oxygen: 1 to 20 mol%, and has a component composition including Cu and inevitable impurities as the balance. Thereby, the laminated body 109 shown in FIG. 2 is produced.
- the composite copper alloy film 114 composed of the oxygen-calcium-containing copper alloy underlayer 112 and the Cu layer 113 contains Ca: 0.01 to 15 mol%, and the copper having a component composition containing Cu and inevitable impurities as the balance. It can be formed by the following method using an alloy target. First, the oxygen-calcium-containing copper alloy base film 112 is formed by sputtering in an inert gas atmosphere containing oxygen. Thereafter, the supply of oxygen is stopped, the atmosphere is changed to an inert gas atmosphere, and the Cu layer 113 is formed by sputtering in the inert gas atmosphere.
- a Cu layer 113 is formed. Since the Cu layer 113 is thus formed by sputtering using a copper alloy target containing Ca: 0.01 to 15 mol%, a trace amount of Ca may be mixed into the Cu layer 113. The amount is very small, 0.05 mol% or less, and is within the range of inevitable impurities. Therefore, the Cu layer 113 has substantially the same composition as copper.
- the composite copper alloy film 114 immediately above the gate electrode 2 is wet-etched, and the barrier film 11 and the n + amorphous Si ohmic film 4 ′ are plasma-etched.
- the drain electrode film 5 and the source electrode film 6 made of the composite copper alloy film 114 located on both sides of the separation groove 7 are formed.
- the thin film transistor intermediate body 110 of the first embodiment shown in the cross-sectional view of FIG. 1 can be manufactured.
- the thin film transistor of the first embodiment can be manufactured by performing hydrogen plasma treatment on the thin film transistor intermediate 110 of the first embodiment having the plasma-etched separation groove 7.
- the thin film transistor according to the first embodiment is subjected to hydrogen plasma treatment, so that the oxygen-calcium-containing copper alloy underlayer 112 in the thin-film transistor intermediate 110 shown in FIG. Since it is produced by changing to a copper alloy underlayer, its cross-sectional shape structure is the same as FIG. Therefore, the description based on the drawings of the thin film transistor of the first embodiment is omitted.
- the conditions for hydrogen plasma treatment of the thin film transistor intermediate of the first embodiment are the same as the hydrogen plasma treatment conditions described in the background art.
- the composition of the thin film transistor intermediate of the first embodiment containing Ca: 0.01 to 10 mol% and oxygen: 1 to 20 mol%, with the balance including Cu and inevitable impurities.
- the oxygen-calcium-containing copper alloy underlayer 112 has an oxygen-calcium enriched layer-containing copper alloy underlayer (not shown) having a concentrated layer having a higher component composition of Ca and oxygen.
- the concentrated layer contains Ca: 2 to 30 mol%, oxygen: 20 to 50 mol%, and the remainder contains Cu and inevitable impurities.
- the concentration layer of the above-described component composition having a higher concentration of Ca and oxygen is obtained.
- the oxygen-calcium enriched layer-containing copper alloy underlayer is produced because the Ca and oxygen contained in the oxygen-calcium-containing copper alloy underlayer 112 having the above-described composition are obtained by performing hydrogen plasma treatment. This is because a concentrated layer having a higher Ca and oxygen concentration is generated near the barrier film 11 by diffusing and moving in the direction of the barrier film 11.
- the following points can be considered as the reason why the alloy underlayer is remarkably excellent in adhesion to a barrier film made of silicon oxide.
- an oxygen-calcium-containing copper alloy underlayer 112 having a component composition containing Ca: 0.01 to 10 mol% and oxygen: 1 to 20 mol%, and the remainder including Cu and inevitable impurities is formed. Hydrogen diffuses and reacts with oxygen in the film to generate water. This water and calcium oxide in the film react to produce calcium hydroxide. Then, calcium ions and hydroxide ions react with the barrier film made of the silicon oxide film, and a strong calcium silicate is generated in contact with the barrier film made of the silicon oxide film. This is considered to significantly improve the adhesion to the barrier film.
- the component composition of the oxygen-calcium-containing copper alloy underlayer in the composite copper alloy film constituting the drain electrode film and the source electrode film of the thin film transistor intermediate of the first embodiment, and the thin film transistor of the first embodiment The reason for limiting the component composition of the concentrated layer contained in the oxygen-calcium concentrated layer-containing copper alloy underlayer in the composite copper alloy film constituting the drain electrode film and the source electrode film as described above will be described.
- Oxygen-calcium-containing copper alloy underlayer of the thin film transistor intermediate according to the first embodiment By incorporating Ca and oxygen in the oxygen-calcium-containing copper alloy underlayer in the composite copper alloy film constituting the drain electrode film and the source electrode film of the thin film transistor intermediate of the present invention, silicon oxide (SiO x ) The adhesion to the barrier film made of a film can be improved.
- Ca: less than 0.01 mol% or oxygen: less than 1 mol% is not preferable because the effect of preventing adhesion deterioration during hydrogen plasma treatment is insufficient.
- a copper alloy target containing Ca in excess of 15 mol% must be prepared. Further, even when reactive sputtering using oxygen is introduced using a copper alloy target containing more than 15 mol% of Ca, since discharge does not occur at the start of sputtering, sputtering cannot be performed efficiently. Note that a copper alloy containing more than 2.5 mol% of Ca is cracked during hot rolling and cannot produce a target. Therefore, it is preferable to produce a target containing Ca in excess of 2.5 mol% by hot pressing Cu—Ca master alloy powder.
- the Ca content is 0.01 to 10 mol%
- the thin film transistor intermediate according to the first embodiment when the amount of Ca contained in the oxygen-calcium-containing copper alloy underlayer constituting the composite copper alloy film is small, a thin film produced by performing hydrogen plasma treatment It is considered that the amount of Ca contained in the oxygen-calcium enriched layer-containing copper alloy underlayer of the transistor is reduced and the amount of Ca does not reach 2 mol%.
- the thickness of the oxygen-calcium-containing copper alloy underlayer should be further increased.
- the amount of Ca contained in the enriched layer in the oxygen-calcium enriched layer-containing copper alloy underlayer of the thin film transistor to be produced can be 2 mol% or more.
- the thickness of the oxygen-calcium-containing copper alloy underlayer is preferably 10 to 100 nm.
- the amount of Ca contained in the oxygen-calcium-containing copper alloy underlayer is at least stable, and the amount of Ca contained in the concentrated layer in the oxygen-calcium-enriched layer-containing copper alloy underlayer of the thin film transistor to be produced is stabilized. It can be 2 to 30 mol%.
- the oxygen-calcium-containing copper alloy underlayer 112 having the above-described composition of the thin film transistor intermediate has Ca: 2 to 30 mol%, and oxygen: 20 to 50 mol%. It has a component composition containing Cu and unavoidable impurities as the balance, and changes so as to have a concentrated layer in which the concentration of Ca and oxygen is higher.
- adhesion to a barrier film made of a silicon oxide (SiO x ) film can be further improved.
- FIG. 3 is a cross-sectional view of the thin film transistor intermediate body of the second embodiment
- FIG. 4 is a cross-sectional view of a stacked body for producing the thin film transistor intermediate body of the second embodiment.
- the gate electrode film 2 made of a copper film is formed on the surface of the glass substrate 1. and, the gate electrode film 2 and silicon nitride on the glass substrate 1 to form a (SiN x) film 3, further n on the silicon nitride (SiN x) film 3 - to form an amorphous Si semiconductor film 4, a barrier film 11 of n + amorphous Si ohmic film 4 'is formed on the amorphous Si semiconductor film 4, made of further silicon oxide (SiO x) film on the n + amorphous Si ohmic film 4' - wherein n To do.
- the barrier film 11 made of this silicon oxide (SiO x ) film can also be formed by ordinary PVD or CVD, but is sputtered while maintaining the atmosphere in the sputtering apparatus so as to be an inert gas atmosphere containing oxygen or oxygen. By doing so, the surface of the n + amorphous Si ohmic film 4 ′ is oxidized, and thereby the barrier film 11 can be formed.
- a composite copper alloy film 214 composed of an oxygen-Ca (Al, Sn, Sb) copper alloy intermediate underlayer 212 and a Cu alloy layer 213 is formed on the barrier film 11.
- the oxygen-Ca (Al, Sn, Sb) copper alloy intermediate underlayer 212 is composed of Ca: 0.2 to 10 mol%, one or more selected from Al, Sn, and Sb in a total of 0.001. It has a component composition containing 05 to 2 mol% and oxygen: 1 to 20 mol%, with the balance including Cu and inevitable impurities. Thereby, the laminated body 209 shown in FIG. 4 is produced.
- the composite copper alloy film 214 composed of the oxygen-Ca (Al, Sn, Sb) copper alloy intermediate underlayer 212 and the Cu alloy layer 213 is composed of Ca: 0.2 to 15 mol% and Al, Sn, and Sb. It can be formed by the following method using a copper alloy target having a component composition containing 0.1 to 2 mol% in total of one or more selected, with the remainder including Cu and inevitable impurities.
- the oxygen-Ca (Al, Sn, Sb) copper alloy intermediate base layer 212 is formed by sputtering in an inert gas atmosphere containing oxygen. Thereafter, the supply of oxygen is stopped, the atmosphere is changed to an inert gas atmosphere not containing oxygen, and the Cu alloy layer 213 is formed by sputtering in the inert gas atmosphere not containing oxygen.
- a copper alloy target having Ca one or two or more selected from Ca: 0.2 to 10 mol%, Al, Sn, and Sb is 0 in total.
- An oxygen-Ca (Al, Sn, Sb) copper alloy intermediate underlayer having a component composition containing 0.05 to 2 mol% and oxygen: 1 to 20 mol% and containing Cu and inevitable impurities as the balance is formed.
- a calcium-containing copper alloy film containing Ca is not formed.
- Ca a copper alloy containing 0.2 to 15 mol% and a total of 0.1 to 2 mol% of one or more selected from Al, Sn and Sb, with the balance being Cu and inevitable impurities
- the Cu alloy layer 213 is formed by sputtering in an inert gas atmosphere not containing oxygen using a target.
- a trace amount of Ca may be mixed in the Cu alloy layer 213, but the amount thereof is extremely small, 0.05 mol% or less, and is in the range of inevitable impurities. Therefore, Ca: 0.2 to 15 mol%, and one or more selected from Al, Sn and Sb are contained in a total of 0.1 to 2 mol%, and the balance includes Cu and inevitable impurities.
- the Cu alloy layer 213 formed by sputtering in an inert gas atmosphere not containing oxygen using a copper alloy target is 0.05% in total of one or more selected from Al, Sn, and Sb. It has a component composition containing ⁇ 2 mol% and containing Cu and inevitable impurities as the balance.
- the composite copper alloy film 214 immediately above the gate electrode 2 is wet-etched, and the barrier film 11 and the n + amorphous Si ohmic film 4 ′ are plasma-etched.
- the drain electrode film 5 and the source electrode film 6 made of the composite copper alloy film 214 located on both sides of the separation groove 7 are formed.
- the thin film transistor intermediate 210 of the second embodiment shown in the cross-sectional view of FIG. 3 can be produced.
- the thin film transistor of the second embodiment can be manufactured by performing hydrogen plasma treatment on the thin film transistor intermediate 210 of the second embodiment having the plasma-etched separation groove 7.
- the thin film transistor according to the second embodiment is subjected to hydrogen plasma treatment so that the oxygen-Ca (Al, Sn, Sb) copper alloy intermediate base layer 212 in the thin film transistor intermediate 210 shown in FIG.
- the oxygen-calcium enriched layer-containing copper alloy underlayer having the above structure is produced by changing to the same shape as that of FIG. Therefore, the description based on the drawings of the thin film transistor of the second embodiment is omitted.
- the conditions for hydrogen plasma treatment of the thin film transistor intermediate of the second embodiment are the same as the hydrogen plasma treatment conditions described in the background art.
- Ca in the thin film transistor intermediate according to the second embodiment 0.2 to 10 mol%, and one or more selected from Al, Sn and Sb are added in a total amount of 0.05 to 2.
- the concentration of Sn, Sb, and oxygen changes to an oxygen-Ca (Al, Sn, Sb) concentrated layer-containing copper alloy underlayer (not shown) having a concentrated layer having a higher component composition.
- the concentrated layer contains Ca: 2 to 30 mol%, one or more selected from Al, Sn and Sb in total, 1 to 10 mol%, oxygen: 20 to 50 mol%, and the balance Contains Cu and inevitable impurities.
- Ca produced in this way 2 to 30 mol%, one or more selected from Al, Sn and Sb in total 1 to 10 mol%, and oxygen: 20 to 50 mol%
- the oxygen-Ca (Al, Sn, Sb) concentrated layer-containing copper alloy underlayer having a concentrated layer of the component composition containing Cu and unavoidable impurities as the balance has excellent adhesion to the barrier film made of silicon oxide. The following points can be considered as reasons.
- Ca 0.2 to 10 mol%, one or more selected from Al, Sn and Sb in total of 0.05 to 2 mol%, and oxygen: 1 to 20 mol%
- oxygen-Ca (Al, Sn, Sb) copper alloy intermediate underlayer 212 having a composition containing Cu and the inevitable impurities as the balance, and water reacts with oxygen in the film to generate water.
- This water and calcium oxide in the film react to produce calcium hydroxide.
- calcium ions and hydroxide ions react with the barrier film made of the silicon oxide film, and a strong calcium silicate is generated in contact with the barrier film made of the silicon oxide film. This is considered to significantly improve the adhesion to the barrier film.
- the component composition of the oxygen-Ca (Al, Sn, Sb) copper alloy intermediate underlayer in the composite copper alloy film constituting the drain electrode film and the source electrode film of the thin film transistor intermediate according to the second embodiment and The component composition of the concentrated layer contained in the oxygen-Ca (Al, Sn, Sb) concentrated layer-containing copper alloy underlayer in the composite copper alloy film constituting the drain electrode film and source electrode film of the thin film transistor of the second embodiment.
- Oxygen-Ca (Al, Sn, Sb) copper alloy intermediate underlayer in the thin film transistor intermediate of the second embodiment Ca, Al, Sn, Sb and oxygen coexist in the oxygen-Ca (Al, Sn, Sb) copper alloy intermediate underlayer in the composite copper alloy film constituting the drain electrode film and the source electrode film of the thin film transistor intermediate.
- the adhesion to the barrier film made of a silicon oxide (SiO x ) film can be improved.
- the resistance value of the formed Cu alloy film increases, and the drain electrode film and the source electrode film It is not preferable to use as. Further, when sputtering is performed in an inert gas atmosphere containing oxygen exceeding 20%, abnormal discharge occurs. Therefore, under the oxygen-Ca (Al, Sn, Sb) copper alloy intermediate containing oxygen exceeding 20 mol%. The formation cannot be formed.
- the Ca content is 0.2 to
- the content of one or more selected from Al, Sn and Sb was 0.05 to 2 mol% in total, and the oxygen content was set to 1 to 20 mol%.
- Oxygen-Ca (Al, Sn, Sb) enriched layer-containing copper alloy underlayer of the thin film transistor of the second embodiment By performing hydrogen plasma treatment on the thin film transistor intermediate, the oxygen-Ca (Al, Sn, Sb) copper alloy intermediate base layer 212 having the above-described composition of the thin film transistor intermediate is subjected to Ca: 2 to 30 mol%, 1 or more selected from Al, Sn and Sb, or a total of 1 to 10 mol%, and oxygen: 20 to 50 mol%, with the balance including Cu and inevitable impurities It has a component composition and changes so as to have a concentrated layer with higher concentrations of Ca, Al, Sn, Sb and oxygen.
- Oxygen-Ca (Al, Sn, Sb) concentrated layer-containing copper alloy underlayer having a concentrated layer of this component composition is generated, thereby further improving adhesion to a barrier film made of a silicon oxide (SiO x ) film. Can do.
- oxygen-free copper 99.99 mass% oxygen-free copper was prepared, and this oxygen-free copper was high-frequency dissolved in a high-purity graphite mold in an Ar gas atmosphere. Components were adjusted so that Ca was added to the obtained molten metal and dissolved to obtain a molten metal having the component composition shown in Table 1. The obtained molten metal was cast into a cooled carbon mold, further hot-rolled, and finally subjected to strain relief annealing. The surface of the obtained rolled body was turned to prepare targets 1A to 1O having dimensions of an outer diameter of 152 mm and a thickness of 5 mm and having the composition shown in Table 1. Furthermore, pure copper target 1P was produced from oxygen-free copper having a purity of 99.999 mass%.
- a glass plate (length: 50 mm, width: 50 mm, thickness: Corning 1737 glass plate having dimensions of 0.7 mm) and a 100 nm thick n + amorphous Si film formed on the surface thereof
- the substrate was placed in a sputtering apparatus. Furthermore, the targets 1A to 1P were placed in the sputtering apparatus so that the distance between the substrate and the target was 70 mm.
- a DC system was adopted as the power source of the sputtering apparatus, and the vacuum container of the sputtering apparatus was evacuated until the ultimate vacuum was 4 ⁇ 10 ⁇ 5 Pa.
- an oxygen-Ar mixed gas containing oxygen at a ratio shown in Tables 2 to 3 was flowed into the vacuum vessel as a sputtering gas, and the sputtering atmosphere pressure was set to 0.67 Pa. Thereafter, discharge (empty sputtering) was performed with an output of 600 W for 1 minute with the shutter closed, and a silicon oxide film having a thickness of about 10 nm was formed on the surface of the n + amorphous Si film. Then, by opening the shutter and discharging at an output of 600 W, an oxygen-calcium-containing copper alloy underlayer having the thickness and component composition shown in Tables 2 to 3 was formed.
- the composite copper alloy films 101 to 114 for the thin film transistor intermediate of the present invention, the composite copper alloy films 101 to 103 for the thin film transistor intermediate of the comparative example, and the composite copper alloy film 101 for the thin film transistor intermediate of the conventional example are obtained. A film was formed.
- a cross-cut adhesion test was performed on the composite copper alloy film for a thin film transistor intermediate thus obtained under the following conditions.
- Cross-cut adhesion test In accordance with JIS-K5400, using a cutter, the surface of the composite copper alloy film for thin film transistor intermediates is cut at 11 mm length and width at 1 mm intervals to make 100 square films (films divided into squares). It was. After the scotch tape made by 3M was brought into close contact, it was peeled off at once, and the number of grid films in which peeling occurred in the grid film adhered to the glass substrate within 10 mm square at the center of the glass substrate was measured. The obtained results are shown in the item “Number of peeled cells (pieces / 100)” in Tables 2 and 3, and used to evaluate the adhesion to the glass substrate.
- the composite copper alloy films 101 to 114 for thin film transistor intermediates according to the present invention have better adhesion than the composite copper alloy film 101 for thin film transistor intermediates according to the conventional example. I found out.
- the composite copper alloy films 101 to 102 for the thin film transistor intermediates of the comparative example having values outside the conditions of the first embodiment are not preferable because the adhesion is slightly inferior.
- the discharge became unstable and abnormal discharge occurred. This is considered to be because an oxide film was formed on the target surface because the oxygen concentration contained in the oxygen-Ar mixed sputtering gas was 25% by volume.
- the discharge was stopped a plurality of times due to the occurrence of the abnormal discharge, but the discharge was restarted each time to form a composite copper alloy film having a predetermined thickness.
- the oxygen-calcium-containing copper alloy underlayer containing oxygen exceeding 20 mol% is stable because abnormal discharge occurs during the film formation. The film could not be formed.
- composite copper alloy films 101 to 114 for thin film transistor intermediates of the present invention examples shown in Tables 2 to 3 shown in Tables 2 to 3, the composite copper alloy films 101 to 102 for thin film transistor intermediates of the comparative examples, and the conventional examples.
- the composite copper alloy film 101 for thin film transistor intermediate was subjected to hydrogen plasma treatment under the following conditions.
- composite copper alloy films 101 to 114 for thin film transistors of the present invention example, composite copper alloy films 101 to 102 for thin film transistors of comparative examples, and composite copper alloy film 101 for thin film transistors of conventional examples were produced.
- These composite copper alloy films for thin film transistors are composed of an oxygen-calcium concentrated layer-containing copper alloy underlayer and a Cu layer having concentrated layers having the composition shown in Tables 4 to 5.
- Hydrogen gas flow rate 500 SCCM
- Hydrogen gas pressure 100Pa Processing temperature: 300 ° C
- RF power flow density 0.1 W / cm 2 Processing time: 2 minutes
- the composite copper alloy films 101 to 114 for thin film transistors of the present invention example have the same specific resistance and no significant difference compared to the composite copper alloy film 101 for thin film transistors of the conventional example. I understood. However, it was found that the composite copper alloy films 101 to 114 for thin film transistors of the present invention example have much better adhesion than the conventional composite copper alloy film 101 for thin film transistors. Therefore, it can be seen that the thin film transistor of the first embodiment of the present invention incorporating the electrode film composed of the composite copper alloy films 101 to 114 for the thin film transistor of the present invention has extremely few failures due to peeling of the electrode film. .
- the composite copper alloy films 101 to 102 for thin film transistors of the comparative example having values outside the conditions of the first embodiment are not preferable as electrode films of thin film transistors because they are inferior in specific resistance and adhesion. I understood.
- Cu—Ca master alloy ingots having different Ca contents After evacuation, Ar gas was introduced and the atmosphere was changed to Ar gas atmosphere to melt and cast in a high-frequency melting furnace to prepare Cu—Ca master alloy ingots having different Ca contents.
- Table 6 shows the results of re-melting these Cu—Ca master alloy ingots having different Ca contents and gas atomizing them with an Ar gas flow at a pressure of 3 MPa while maintaining the temperature at 1250 ° C.
- Cu-Ca master alloy powder having a composition as described above was prepared. The obtained Cu—Ca master alloy powder was classified to prepare a Cu—Ca master alloy powder having a maximum particle size of 100 ⁇ m or less.
- this Cu—Ca master alloy powder is filled into a graphite mold coated with a release agent, and hot pressed under the conditions of temperature: 800 ° C., pressure: 15 MPa, holding time: 30 minutes. Produced.
- This hot press body was machined to prepare targets 1a to 1n having the component compositions shown in Table 6.
- a glass plate (vertical: 50 mm, horizontal: 50 mm, thickness: 1737 glass plate made by Corning Co., Ltd.) and a 100 nm thick n + amorphous Si film formed on the surface thereof
- a substrate consisting of Furthermore, the targets 1a to 1n shown in Table 6 were placed in the sputtering apparatus so that the distance between the substrate and the target was 70 mm.
- a DC system was adopted as the power source of the sputtering apparatus, and the vacuum container of the sputtering apparatus was evacuated until the ultimate vacuum was 4 ⁇ 10 ⁇ 5 Pa.
- an oxygen-Ar mixed gas containing oxygen at a ratio shown in Table 7 was flowed as a sputtering gas into the vacuum vessel, and the sputtering atmosphere pressure was set to 0.67 Pa. Thereafter, discharge (empty sputtering) was performed with an output of 600 W for 1 minute with the shutter closed, and a silicon oxide film having a thickness of about 10 nm was formed on the surface of the n + amorphous Si film. Then, by opening the shutter and discharging at an output of 600 W, an oxygen-calcium-containing copper alloy underlayer having a thickness of 50 nm and a component composition shown in Table 7 was formed.
- the analysis of Ca and oxygen contained in the oxygen-calcium-containing copper alloy underlayer in the thin film transistor intermediate composite copper alloy films 115 to 127 of the present invention was performed under the same conditions as in Example 1 under the conditions of scanning Auger electrons.
- a spectroscopic analysis apparatus (type: PHI700, manufactured by ULVAC-PHI Co., Ltd.) was used.
- the composite copper alloy films 115 to 127 for thin film transistor intermediates of the present invention examples have better adhesion than the conventional composite copper alloy film 101 for thin film transistor intermediates of Table 3. I found out.
- the hydrogen plasma treatment was performed under the same conditions as in Example 2 on the composite copper alloy films 115 to 127 for thin film transistor intermediates of the present invention examples shown in Table 7 that could be formed.
- composite copper alloy films 115 to 127 for thin film transistors of the present invention were produced.
- These composite copper alloy films for thin film transistors are composed of an oxygen-calcium concentrated layer-containing copper alloy underlayer and a Cu layer having a concentrated layer having the component composition shown in Table 8.
- the specific resistances of the composite copper alloy films 115 to 127 for thin film transistors of the present invention example are the same as the composite copper alloy film 101 for thin film transistors of Table 5 and are not significantly different. I understood it. However, it was found that the composite copper alloy films 115 to 127 for thin film transistors of the present invention example have much better adhesion than the conventional composite copper alloy film 101 for thin film transistors. Therefore, it can be seen that the thin film transistor of the first embodiment of the present invention incorporating the electrode film composed of the composite copper alloy films 115 to 127 for the thin film transistor of the present invention example has extremely few failures due to peeling of the electrode film. .
- oxygen-free copper 99.99 mass% oxygen-free copper was prepared, and this oxygen-free copper was high-frequency dissolved in a high-purity graphite mold in an Ar gas atmosphere. Ingredients were adjusted such that one or more selected from Ca and Al, Sn, and Sb were added to the obtained molten metal and dissolved to obtain a molten metal having the component composition shown in Table 9. The obtained molten metal was cast into a cooled carbon mold, further hot-rolled, and finally subjected to strain relief annealing. The surface of the obtained rolled body was turned to prepare targets 2A to 2M having dimensions of an outer diameter of 152 mm and a thickness of 6 mm and having the composition shown in Table 9. Further, a pure copper target 2N was produced from oxygen-free copper having a purity of 99.99% by mass.
- a glass plate (length: 50 mm, width: 50 mm, thickness: Corning 1737 glass plate having dimensions of 0.7 mm) and a 100 nm thick n + amorphous Si film formed on the surface thereof
- the substrate was placed in a sputtering apparatus. Furthermore, the targets 2A to 2M were placed in the sputtering apparatus so that the distance between the substrate and the target was 70 mm.
- a DC system was adopted as the power source of the sputtering apparatus, and the vacuum container of the sputtering apparatus was evacuated until the ultimate vacuum was 4 ⁇ 10 ⁇ 5 Pa.
- an oxygen-Ar mixed gas containing oxygen at a ratio shown in Table 10 was flowed as a sputtering gas into the vacuum vessel, and the sputtering atmosphere pressure was set to 0.67 Pa. Thereafter, discharge (empty sputtering) was performed with an output of 600 W for 1 minute with the shutter closed, and a silicon oxide film having a thickness of about 10 nm was formed on the surface of the n + amorphous Si film. Then, by opening the shutter and discharging at an output of 600 W, an oxygen-Ca (Al, Sn, Sb) copper alloy intermediate underlayer having a thickness of 50 nm and the component composition shown in Table 10 is formed. Filmed.
- the composite copper alloy films 201 to 212 for the thin film transistor intermediate of the present invention, the composite copper alloy films 201 to 203 for the thin film transistor intermediate of the comparative example, and the composite copper alloy film 201 for the thin film transistor intermediate of the conventional example are obtained. A film was formed.
- the composite copper alloy films 201 to 212 for thin film transistor intermediates of the present invention have better adhesion than the conventional composite copper alloy film 201 for thin film transistor intermediates. I understood.
- the composite copper alloy films 201 to 202 for thin film transistor intermediates of the comparative example having values outside the conditions of the second embodiment are not preferable because of poor adhesion.
- the discharge became unstable and abnormal discharge occurred. This is considered to be because an oxide film was formed on the target surface because the oxygen concentration contained in the oxygen-Ar mixed sputtering gas was 25% by volume.
- the discharge was stopped a plurality of times due to the occurrence of the abnormal discharge, but the discharge was restarted each time to form a composite copper alloy film having a predetermined thickness.
- the oxygen-Ca (Al, Sn, Sb) copper alloy intermediate underlayer containing oxygen exceeding 20 mol% is abnormal during film formation. Since discharge occurred, the film could not be formed stably.
- the composite copper alloy film 201 for intermediate was subjected to hydrogen plasma treatment under the same conditions as in Example 2.
- composite copper alloy films 201 to 212 for thin film transistors of the present invention example, composite copper alloy films 201 to 202 for thin film transistors of a comparative example, and composite copper alloy film 201 for thin film transistors of a conventional example were produced.
- These composite copper alloy films for thin film transistors have an oxygen-Ca (Al, Sn, Sb) concentrated layer-containing copper alloy underlayer including a concentrated layer having the component composition shown in Table 11.
- the composite copper alloy films 201 to 212 for thin film transistors of the present invention have the same specific resistance and no significant difference compared to the composite copper alloy film 201 for thin film transistors of the conventional example. It was. However, it was found that the composite copper alloy films 201 to 212 for thin film transistors of the present invention example had much better adhesion than the conventional composite copper alloy film 201 for thin film transistors. For this reason, it can be seen that the thin film transistor of the second embodiment of the present invention incorporating the electrode film composed of the composite copper alloy films 201 to 212 for the thin film transistor of the present invention has extremely few failures due to peeling of the electrode film. . Since the composite copper alloy films 201 to 202 for thin film transistors of comparative examples having values outside the conditions of the second embodiment are inferior in specific resistance and adhesion, they are not preferable as electrode films of thin film transistors. I understood.
- Cu master alloy ingots having different Ca, Al, Sn, and Sb contents.
- the component compositions shown in Table 12 were obtained by remelting these Cu mother alloy ingots having different contents, and gas atomizing with an Ar gas flow at a pressure of 3 MPa while maintaining the obtained molten metal at a temperature of 1250 ° C.
- Cu mother alloy powder having the following was prepared. The obtained Cu mother alloy powder was classified to prepare a Cu mother alloy powder having a maximum particle size of 100 ⁇ m or less.
- this Cu mother alloy powder was filled in a graphite mold coated with a release agent, and hot pressed under the conditions of temperature: 800 ° C., pressure: 15 MPa, holding time: 30 minutes, thereby producing a hot press body. .
- This hot press body was machined to prepare targets 2a to 2n having the component compositions shown in Table 12.
- a glass plate (vertical: 50 mm, horizontal: 50 mm, thickness: 1737 glass plate made by Corning Co., Ltd.) and a 100 nm thick n + amorphous Si film formed on the surface thereof
- a substrate consisting of Furthermore, the targets 2a to 2n in Table 12 were placed in the sputtering apparatus so that the distance between the substrate and the target was 70 mm.
- a DC system was adopted as the power source of the sputtering apparatus, and the vacuum container of the sputtering apparatus was evacuated until the ultimate vacuum was 4 ⁇ 10 ⁇ 5 Pa.
- an oxygen-Ar mixed gas containing oxygen at a ratio shown in Table 13 was allowed to flow as a sputtering gas into the vacuum vessel, and the sputtering atmosphere pressure was set to 0.67 Pa. Thereafter, discharge (empty sputtering) was performed with an output of 600 W for 1 minute with the shutter closed, and a silicon oxide film having a thickness of about 10 nm was formed on the surface of the n + amorphous Si film. Then, by opening the shutter and discharging at an output of 600 W, an oxygen-Ca (Al, Sn, Sb) copper alloy intermediate underlayer having a thickness of 50 nm and a component composition shown in Table 13 is formed. A film was formed.
- the composite copper alloy films 212 to 224 for the thin film transistor intermediate of the example of the present invention were formed.
- Comparative Example 204 an attempt was made to form a film using a target n containing more than 15 mol% of Ca in Table 12, but no discharge occurred at the start of sputtering. For this reason, the composite copper alloy film 204 for a thin film transistor intermediate in the comparative example could not be formed.
- the composite copper alloy films 212 to 224 for thin film transistor intermediates of the present invention have superior adhesion compared to the conventional composite copper alloy film 201 for thin film transistor intermediates of Table 10. I found out.
- composite copper alloy films 212 to 224 for thin film transistor intermediates of the present invention examples shown in Table 13 that could be formed.
- composite copper alloy films 212 to 224 for thin film transistors of the present invention were produced.
- These composite copper alloy films for thin film transistors are composed of an oxygen-Ca (Al, Sn, Sb) concentrated layer-containing copper alloy underlayer and Cu alloy layer having a concentrated layer having the composition shown in Table 14.
- the specific resistances of the composite copper alloy films 212 to 224 for thin film transistors of the present invention are the same as the conventional composite copper alloy film 201 for thin film transistors of Table 11 and are not significantly different. I understood it. However, it was found that the composite copper alloy films 212 to 224 for thin film transistors of the present invention example have much better adhesion than the conventional composite copper alloy film 201 for thin film transistors. Therefore, it can be seen that the thin film transistor according to the second embodiment of the present invention, in which the electrode film composed of the composite copper alloy films 212 to 224 for the thin film transistor of the example of the present invention is built, has extremely few failures due to peeling of the electrode film. .
- the thin film transistor and thin film transistor intermediate of the present invention have excellent adhesion between the drain electrode film and the source electrode film. For this reason, even if vibration is applied during transportation, there is almost no possibility of failure due to peeling of the drain electrode film and the source electrode film. Therefore, the present invention can be applied to a thin film transistor used for a flat panel display or the like and an intermediate body of the thin film transistor.
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Abstract
Description
本願は、2008年9月26日に、日本に出願された特願2008-247460号に基づき優先権を主張し、その内容をここに援用する。
この密着性が低下することを阻止するために、従来から知られている酸素を含む銅膜を下地層とし、この下地層の上に純銅膜を形成した複合銅膜を、ドレイン電極膜およびソース電極膜として使用してみた。しかし、水素プラズマ処理後の複合銅膜では、依然としてn+アモルファスSiオーミック膜4´に対して十分な密着性は得られず、剥離が生じて薄膜トランジスター不良の原因となる可能性があることが分かった。
薄膜トランジスターのバリア膜として従来から知られているMo膜、Ti膜などの金属膜よりも、酸化ケイ素(SiOx)膜をバリア膜として使用することによって、ドレイン電極膜およびソース電極膜の密着性を更に向上させることができるため、好ましい。
このことから、まず、図2の断面図に示されるように、ガラス基板1の上にゲート電極膜2を形成し、前記ガラス基板1およびゲート電極膜2の上に窒化珪素膜3を形成し、前記窒化珪素膜3の上にn-アモルファスSi半導体膜4を形成し、前記n-アモルファスSi半導体膜4の上にn+アモルファスSiオーミック膜4´を形成し、前記n+アモルファスSiオーミック膜4´の上に酸化ケイ素(SiOx)膜からなるバリア膜11を形成する。
次に、前記酸化ケイ素(SiOx)膜からなるバリア膜11の上に、酸素-カルシウム含有銅合金下地層112を形成し、前記酸素-カルシウム含有銅合金下地層112の上にCu層113を形成する。この酸素-カルシウム含有銅合金下地層112とCu層113によって、複合銅合金膜114が構成される。前記酸素-カルシウム含有銅合金下地層112は、Ca:0.01~10モル%、及び酸素:1~20モル%を含有し、残部としてCuおよび不可避不純物を含む成分組成を有する。以上により、積層体109が作製される。
この積層体109において、ゲート電極2の真上の部分の複合銅合金膜114を湿式エッチングし、さらに前記酸化ケイ素膜からなるバリア膜11およびn+アモルファスSiオーミック膜4´をプラズマエッチングする。これにより分離溝7を形成して、n-アモルファスSi半導体膜4を露出させ、それによってドレイン電極膜5およびソース電極膜6を形成する。以上により図1の断面図に示される第1の態様の薄膜トランジスター中間体110を作製できる。
第1の態様の薄膜トランジスター中間体110に水素プラズマ処理を施すと、酸素-カルシウム含有銅合金下地層112中において、Caおよび酸素の濃度が更に高い濃縮層が形成される。この濃縮層は、Ca:2~30モル%、及び酸素:20~50モル%を含有し、残部としてCuおよび不可避不純物を含む成分組成を有する。
これにより酸素-カルシウム含有銅合金下地層112は、この濃縮層を有する酸素-カルシウム濃縮層含有銅合金下地層(図示せず)に変化して、酸素-カルシウム濃縮層含有銅合金下地層およびCu層とからなる複合銅合金膜が生成する。ドレイン電極膜およびソース電極膜は、この酸素-カルシウム濃縮層含有銅合金下地層およびCu層とからなる複合銅合金膜を有するため、バリア膜11に対する密着性が格段に向上する。
薄膜トランジスターのバリア膜として従来から知られているMo膜、Ti膜などの金属膜よりも、酸化ケイ素(SiOx)膜をバリア膜として使用することによって、ドレイン電極膜およびソース電極膜の密着性を更に向上させることができるため、好ましい。
このことから、まず、図4の断面図に示されるように、ガラス基板1の上にゲート電極膜2を形成し、前記ガラス基板1およびゲート電極膜2の上に窒化珪素膜3を形成し、前記窒化珪素膜3の上にn-アモルファスSi半導体膜4を形成し、前記n-アモルファスSi半導体膜4の上にn+アモルファスSiオーミック膜4´を形成し、前記n+アモルファスSiオーミック膜4´の上に酸化ケイ素(SiOx)膜からなるバリア膜11を形成する。
次に、前記酸化ケイ素(SiOx)膜からなるバリア膜11の上に、酸素-Ca(Al、Sn、Sb)銅合金中間体下地層212を形成し、前記酸素-Ca(Al、Sn、Sb)銅合金中間体下地層212の上にCu合金層213を形成する。この酸素-Ca(Al、Sn、Sb)銅合金中間体下地層212とCu合金層213によって、複合銅合金膜214が構成される。前記酸素-Ca(Al、Sn、Sb)銅合金中間体下地層212は、Ca:0.2~10モル%、Al、SnおよびSbから選択される1種または2種以上を合計で0.05~2モル%、及び酸素:1~20モル%を含有し、残部としてCuおよび不可避不純物を含む成分組成を有する銅合金下地層(以下、この成分組成を有する銅合金下地層を「酸素-Ca(Al、Sn、Sb)銅合金中間体下地層」という)である。以上により、積層体209が作製される。
この積層体209において、ゲート電極2の真上の部分の複合銅合金膜214を湿式エッチングし、さらに前記酸化ケイ素膜からなるバリア膜11およびn+アモルファスSiオーミック膜4´をプラズマエッチングする。これにより分離溝7を形成して、n-アモルファスSi半導体膜4を露出させ、それによってドレイン電極膜5およびソース電極膜6を形成する。以上により図3の断面図に示される第2の態様の薄膜トランジスター中間体210を作製できる。
第2の態様の薄膜トランジスター中間体210に水素プラズマ処理を施すと、酸素-Ca(Al、Sn、Sb)銅合金中間体下地層212中において、Ca、Al、Sn、Sbおよび酸素の濃度が更に高い濃縮層が形成される。この濃縮層は、Ca:2~30モル%、Al、SnおよびSbから選択される1種または2種以上を合計で1~10モル%、及び酸素:20~50モル%を含有し、残部としてCuおよび不可避不純物を含む成分組成を有する。
これにより酸素-Ca(Al、Sn、Sb)銅合金中間体下地層212は、この濃縮層を有する銅合金下地層(以下、この濃縮層を有する銅合金下地層を「酸素-Ca(Al、Sn、Sb)濃縮層含有銅合金下地層」という)(図示せず)に変化して、酸素-Ca(Al、Sn、Sb)濃縮層含有銅合金下地層およびCu合金層とからなる複合銅合金膜が生成する。ドレイン電極膜およびソース電極膜は、この酸素-Ca(Al,Sn,Sb)濃縮層含有銅合金下地層およびCu合金層とからなる複合銅合金膜を有するため、バリア膜11に対する密着性が格段に向上する。
(1)本発明の第1の態様の薄膜トランジスターは、ガラス基板と、前記ガラス基板の上に形成されたゲート電極膜と、前記ガラス基板およびゲート電極膜の上に形成された窒化珪素膜と、前記窒化珪素膜の上に形成されたn-アモルファスSi半導体膜と、前記n-アモルファスSi半導体膜の上に形成されたn+アモルファスSiオーミック膜と、前記n+アモルファスSiオーミック膜の上に形成された酸化ケイ素膜からなるバリア膜と、前記酸化ケイ素膜からなるバリア膜の上に形成されたドレイン電極膜およびソース電極膜を有する。
前記ドレイン電極膜および前記ソース電極膜は、少なくとも前記酸化ケイ素膜からなるバリア膜に接して形成された酸素-カルシウム濃縮層含有銅合金下地層と、前記酸素-カルシウム濃縮層含有銅合金下地層の上に形成されたCu層とからなる複合銅合金膜を有する。
前記酸素-カルシウム濃縮層含有銅合金下地層は、濃縮層を有する。
前記濃縮層は、Ca:2~30モル%、及び酸素:20~50モル%を含有し、残部としてCuおよび不可避不純物を含む。
前記ドレイン電極膜および前記ソース電極膜は、前記酸化ケイ素膜からなるバリア膜に接して形成された酸素-カルシウム含有銅合金下地層と、前記酸素-カルシウム含有銅合金下地層の上に形成されたCu層とからなる複合銅合金膜を有する。
前記酸素-カルシウム含有銅合金下地層は、Ca:0.01~10モル%、及び酸素:1~20モル%を含有し、残部としてCuおよび不可避不純物を含む。
前記ドレイン電極膜および前記ソース電極膜は、少なくとも前記酸化ケイ素膜からなるバリア膜に接して形成された酸素-Ca(Al,Sn,Sb)濃縮層含有銅合金下地層と、前記酸素-Ca(Al,Sn,Sb)濃縮層含有銅合金下地層の上に形成されたCu合金層とからなる複合銅合金膜を有する。
前記酸素-Ca(Al,Sn,Sb)濃縮層含有銅合金下地層は、濃縮層を有する銅合金下地層である。
前記濃縮層は、Ca:2~30モル%、Al、SnおよびSbから選択される1種または2種以上を合計で1~10モル%、及び酸素:20~50モル%を含有し、残部としてCuおよび不可避不純物を含む。
前記ドレイン電極膜および前記ソース電極膜は、前記酸化ケイ素膜からなるバリア膜に接して形成されている酸素-Ca(Al,Sn,Sb)銅合金中間体下地層と、前記酸素-Ca(Al,Sn,Sb)銅合金中間体下地層の上に形成されたCu合金層とからなる複合銅合金膜を有する。
前記酸素-Ca(Al,Sn,Sb)銅合金中間体下地層は、Ca:0.2~10モル%、Al、SnおよびSbから選択される1種または2種以上を合計で0.05~2モル%、及び酸素:1~20モル%を含有し、残部としてCuおよび不可避不純物を含む。
(第1の実施形態)
この第1の実施形態は、前述した本発明の第1の態様に相当する。
第1の実施形態の薄膜トランジスターおよび薄膜トランジスター中間体について、その製造方法と共に図面に基づいて詳細に説明する。
図1は、第1の実施形態の薄膜トランジスター中間体の断面図であり、図2は、第1の実施形態の薄膜トランジスター中間体を作製するための積層体の断面図である。
まず、酸素を含む不活性ガス雰囲気中でスパッタすることにより、酸素-カルシウム含有銅合金下地膜112を形成する。その後、酸素の供給を停止して、雰囲気を不活性ガス雰囲気とし、この不活性ガス雰囲気中においてスパッタすることにより、Cu層113を形成する。
このようにCu層113は、Ca:0.01~15モル%を含有する銅合金ターゲットを用いてスパッタすることにより成膜するため、Cu層113には微量のCaが混入することがあるが、その量は極めて少なく、0.05モル%以下であり、不可避不純物の範囲内である。したがって、Cu層113は、ほぼ銅と同じ組成を有する。
この第1の実施形態の薄膜トランジスターは、水素プラズマ処理することにより、図1に示される薄膜トランジスター中間体110における酸素-カルシウム含有銅合金下地層112が、濃縮層を有する酸素-カルシウム濃縮層含有銅合金下地層に変化して作製されたものであるから、その断面形状構造は図1と同じである。したがって、第1の実施形態の薄膜トランジスターの図面に基づく説明は省略した。
この水素プラズマ処理によって、第1の実施形態の薄膜トランジスター中間体のCa:0.01~10モル%、及び酸素:1~20モル%を含有し、残部としてCuおよび不可避不純物を含む成分組成を有する酸素-カルシウム含有銅合金下地層112は、Caおよび酸素の濃度が更に高い成分組成の濃縮層を有する酸素-カルシウム濃縮層含有銅合金下地層(図示せず)に変化する。前記濃縮層は、Ca:2~30モル%、酸素:20~50モル%を含有し、残部としてCuおよび不可避不純物を含む。
この酸素-カルシウム濃縮層含有銅合金下地層が生成することによって、薄膜トランジスターにおいて、ドレイン電極膜5およびソース電極膜6のバリア膜に対する密着性が格段に向上する。
この発明の薄膜トランジスター中間体のドレイン電極膜およびソース電極膜を構成する複合銅合金膜における酸素-カルシウム含有銅合金下地層にCaおよび酸素を共存させて含ませることにより、酸化ケイ素(SiOx)膜からなるバリア膜に対する密着性を向上させることができる。
一方、Caを10モル%を越えて含有するためには、Caを15モル%を越えて含有する銅合金ターゲットを作製しなければならない。またCaを15モル%を越えて含有する銅合金ターゲットを用いて、酸素を導入する反応性スパッタを行っても、スパッタ開始時に放電が立たなくなるので、効率良くスパッタをおこなうことできない。
なお、Caを2.5モル%を越えて含有する銅合金は、熱間圧延時に割れが発生してターゲットを作製することができなくなる。したがって、Caを2.5モル%を越えて含有するターゲットは、Cu-Ca母合金粉末をホットプレスすることにより作製することが好ましい。
酸素-カルシウム含有銅合金下地層の厚さは、好ましくは10~100nmである。この場合、酸素-カルシウム含有銅合金下地層に含まれるCaの量が少なくとも、作製される薄膜トランジスターの酸素-カルシウム濃縮層含有銅合金下地層中の濃縮層に含まれるCaの量を安定して2~30モル%とすることができる。
この薄膜トランジスター中間体を水素プラズマ処理することにより、薄膜トランジスター中間体の前記成分組成を有する酸素-カルシウム含有銅合金下地層112は、Ca:2~30モル%、及び酸素:20~50モル%を含有し、残部としてCuおよび不可避不純物を含む成分組成を有し、Caおよび酸素の濃度がさらに高い濃縮層を有するように変化する。
この成分組成の濃縮層を有する酸素-カルシウム濃縮層含有銅合金下地層が生成することにより、酸化ケイ素(SiOx)膜からなるバリア膜に対する密着性をさらに向上させることができる。
この第2の実施形態は、前述した本発明の第2の態様に相当する。
第2の実施形態の薄膜トランジスターおよび薄膜トランジスター中間体について、その製造方法と共に図面に基づいて詳細に説明する。
図3は、第2の実施形態の薄膜トランジスター中間体の断面図であり、図4は、第2の実施形態の薄膜トランジスター中間体を作製するための積層体の断面図である。
まず、酸素を含む不活性ガス雰囲気中でスパッタすることにより、酸素-Ca(Al,Sn,Sb)銅合金中間体下地層212を形成する。その後、酸素の供給を停止して、雰囲気を、酸素を含まない不活性ガス雰囲気とし、この酸素を含まない不活性ガス雰囲気中においてスパッタすることにより、Cu合金層213を形成する。
なお、後述するように、上記組成と同じ成分組成を有する銅合金ターゲットを用いて、酸素を含まない不活性ガス雰囲気中においてスパッタしても、Caを含有するカルシウム含有銅合金膜は形成されない。
Cu合金層213には、微量のCaが混入することがあるが、その量は極めて少なく、0.05モル%以下であり、不可避不純物の範囲内である。したがって、Ca:0.2~15モル%、及びAl、SnおよびSbから選択される1種または2種以上を合計で0.1~2モル%を含有し、残部としてCuおよび不可避不純物を含む銅合金ターゲットを用いて、酸素を含まない不活性ガス雰囲気中においてスパッタして形成されるCu合金層213は、Al、SnおよびSbから選択される1種または2種以上を合計で0.05~2モル%を含有し、残部としてCuおよび不可避不純物を含む成分組成を有するようになる。
この第2の実施形態の薄膜トランジスターは、水素プラズマ処理することにより、図3に示される薄膜トランジスター中間体210における酸素-Ca(Al,Sn,Sb)銅合金中間体下地層212が、濃縮層を有する酸素-カルシウム濃縮層含有銅合金下地層に変化して作製されたものであるから、その断面の形状構造は図3と同じである。したがって、第2の実施形態の薄膜トランジスターの図面に基づく説明は省略した。
この水素プラズマ処理によって、第2の実施形態の薄膜トランジスター中間体のCa:0.2~10モル%、Al、SnおよびSbから選択される1種または2種以上を合計で0.05~2モル%、及び酸素:1~20モル%を含有し、残部としてCuおよび不可避不純物を含む成分組成を有する酸素-Ca(Al,Sn,Sb)銅合金中間体下地層212は、Ca、Al、Sn、Sbおよび酸素の濃度が更に高い成分組成の濃縮層を有する酸素-Ca(Al,Sn,Sb)濃縮層含有銅合金下地層(図示せず)に変化する。前記濃縮層は、Ca:2~30モル%、Al、SnおよびSbから選択される1種または2種以上を合計で1~10モル%、酸素:20~50モル%を含有し、残部としてCuおよび不可避不純物を含む。
この酸素-Ca(Al,Sn,Sb)濃縮層含有銅合金下地層が生成することによって、薄膜トランジスターにおいて、ドレイン電極膜5およびソース電極膜6のバリア膜に対する密着性が格段に向上する。
この薄膜トランジスター中間体のドレイン電極膜およびソース電極膜を構成する複合銅合金膜における酸素-Ca(Al,Sn,Sb)銅合金中間体下地層にCa、Al、Sn、Sbおよび酸素を共存させて含ませることにより、酸化ケイ素(SiOx)膜からなるバリア膜に対する密着性を向上させることができる。
一方、Caを10モル%を越えて含有するためには、Caを15モル%を越えて含有する銅合金ターゲットを作製しなければならない。またCaを15モル%を越えて含有する銅合金ターゲットを用いて、酸素を導入する反応性スパッタを行っても、スパッタ開始時に放電が立たなくなるので、効率良くスパッタを行うことができない。
なお、Caを2.5モル%を越えて含有する銅合金は、熱間圧延時に割れが発生してターゲットを作製することができなくなる。したがって、Caを2.5モル%を越えて含有するターゲットは、Cu母合金粉末をホットプレスすることにより作製することが好ましい。
また、20%を越えて酸素を含む不活性ガス雰囲気中でスパッタリングすると、異常放電が生じるため、酸素を20モル%を越えて含有する酸素-Ca(Al,Sn,Sb)銅合金中間体下地層を形成できない。
この薄膜トランジスター中間体を水素プラズマ処理することにより、薄膜トランジスター中間体の前記成分組成を有する酸素-Ca(Al,Sn,Sb)銅合金中間体下地層212は、水素プラズマ処理中に、Ca:2~30モル%、Al、SnおよびSbから選択される1種または2種以上を合計で1~10モル%、及び酸素:20~50モル%を含有し、残部としてCuおよび不可避不純物を含む成分組成を有し、Ca、Al、Sn、Sbおよび酸素の濃度がさらに高い濃縮層を有するように変化する。
この成分組成の濃縮層を有する酸素-Ca(Al,Sn,Sb)濃縮層含有銅合金下地層が生成することにより、酸化ケイ素(SiOx)膜からなるバリア膜に対する密着性をさらに向上させることができる。
得られた溶湯を、冷却されたカーボン鋳型に鋳造し、さらに熱間圧延し、その後、最終的に歪取り焼鈍した。
得られた圧延体の表面を旋盤加工して外径:152mm、厚さ:5mmの寸法を有し、表1に示される成分組成を有するターゲット1A~1Oを作製した。さらに、純度:99.999質量%の無酸素銅から純銅ターゲット1Pを作製した。
そして、シャッターを開き、出力:600Wで放電することにより、表2~3に示される厚さおよび成分組成を有する酸素-カルシウム含有銅合金下地層を成膜した。引き続いて酸素の供給を停止し、Arガスのみで0.67Paの圧力でスパッタすることにより、厚さ:250nmを有し、Cuおよび不可避不純物からなるCu層を成膜した。
以上により、本発明例の薄膜トランジスター中間体用複合銅合金膜101~114、比較例の薄膜トランジスター中間体用複合銅合金膜101~103および従来例の薄膜トランジスター中間体用複合銅合金膜101を成膜した。
碁盤目付着試験:
JIS-K5400に準じ、薄膜トランジスター中間体用複合銅合金膜の表面に、カッターを用いて、縦横11本ずつ1mm間隔で切り込みを入れ、100個の升目膜(正方形に区切られた膜)を作った。3M社製スコッチテープを密着させたのち一気に引き剥がし、ガラス基板中央部の10mm角内でガラス基板に付着していた升目膜において、剥離が生じた升目膜の数を測定した。
得られた結果を、表2,3中の項目『剥離した升目の数(個/100)』に示し、ガラス基板に対する密着性を評価するために用いた。
(電子銃)
加速電圧:5kV
照射電流:10nA(ファラデーカップで測定)
ビーム径:10μm(直径)
(イオン銃)
加速電圧:1kV
エミッション電流:10mA
ラスター幅:1×1mm
(試料ステージ)
傾斜:30°
ローテーション:Zalar
回転スピード:0.8rpm
(分析条件)
スパッターモード:Alternating W/Zalar
スパッターインターバル:1分
第1の実施形態の条件から外れた値を有する比較例の薄膜トランジスター中間体用複合銅合金膜101~102は、密着性がやや劣るので好ましくない。
(水素プラズマ処理の条件)
ガス:100%水素ガス
水素ガス流量:500SCCM
水素ガス圧:100Pa
処理温度:300℃
RF電力流密度:0.1W/cm2
処理時間:2分
得られた結果を表4~5に示し、薄膜トランジスター用複合銅合金膜の評価を行った。
なお、薄膜トランジスター用複合銅合金膜の酸素-カルシウム濃縮層含有銅合金下地層に含まれる濃縮層のCaおよび酸素の分析は、実施例1と同じ条件で行った。
第1の実施形態の条件から外れた値を有する比較例の薄膜トランジスター用複合銅合金膜101~102は、比抵抗および密着性の少なくともいずれかが劣るので、薄膜トランジスターの電極膜として好ましくないことがわかった。
得られたCu-Ca母合金粉末を分級して、最大粒径:100μm以下のCu-Ca母合金粉末を作製した。次いで、このCu-Ca母合金粉末を、離型剤を塗布した黒鉛モールドに充填し、温度:800℃、圧力:15MPa、保持時間:30分間の条件でホットプレスすることにより、ホットプレス体を作製した。
このホットプレス体を機械加工して、表6に示される成分組成を有するターゲット1a~1nを作製した。
そして、シャッターを開き、出力:600Wで放電することにより、厚さ:50nmを有し、かつ表7に示される成分組成を有する酸素-カルシウム含有銅合金下地層を成膜した。引き続いて酸素の供給を停止し、Arガスのみで0.67Paの圧力でスパッタすることにより、厚さ:250nmを有し、Cuおよび不可避不純物からなるCu層を成膜した。
以上により、本発明例の薄膜トランジスター中間体用複合銅合金膜115~127を成膜した。なお、比較例104において、表6のCaを15モル%を越えて含むターゲット1nを用いて、成膜を試みたが、スパッタ開始時に放電が立たなかった。このため、比較例の薄膜トランジスター中間体用複合銅合金膜104は成膜できなかった。
得られた結果を表8に示し、薄膜トランジスター用複合銅合金膜の評価を行った。
なお、薄膜トランジスター用複合銅合金膜に含まれる濃縮層のCaおよび酸素の分析は、実施例1と同じ条件で行った。
得られた溶湯を、冷却されたカーボン鋳型に鋳造し、さらに熱間圧延し、その後、最終的に歪取り焼鈍した。
得られた圧延体の表面を旋盤加工して外径:152mm、厚さ:6mmの寸法を有し、表9に示される成分組成を有するターゲット2A~2Mを作製した。さらに、純度:99.99質量%の無酸素銅から純銅ターゲット2Nを作製した。
そして、シャッターを開き、出力:600Wで放電することにより、厚さ:50nmであり、かつ表10に示される成分組成を有する酸素-Ca(Al,Sn,Sb)銅合金中間体下地層を成膜した。引き続いて酸素の供給を停止し、Arガスのみで0.67Paの圧力でスパッタすることにより、厚さ:250nmを有し、Cuおよび不可避不純物からなるCu合金層を成膜した。
以上により、本発明例の薄膜トランジスター中間体用複合銅合金膜201~212、比較例の薄膜トランジスター中間体用複合銅合金膜201~203および従来例の薄膜トランジスター中間体用複合銅合金膜201を成膜した。
得られた結果を、表10中の項目『剥離した升目の数(個/100)』に示し、ガラス基板に対する密着性を評価するために用いた。
第2の実施形態の条件から外れた値を有する比較例の薄膜トランジスター中間体用複合銅合金膜201~202は、密着性がやや劣るので好ましくない。
得られた結果を表11に示し、薄膜トランジスター用複合銅合金膜の評価を行った。
なお、薄膜トランジスター用複合銅合金膜の酸素-Ca(Al,Sn,Sb)濃縮層含有銅合金下地層に含まれる濃縮層のCa、Al、Sn、Sbおよび酸素の分析は実施例1と同じ条件で行った。
第2の実施形態の条件から外れた値を有する比較例の薄膜トランジスター用複合銅合金膜201~202は、比抵抗および密着性の少なくともいずれかが劣るので、薄膜トランジスターの電極膜として好ましくないことがわかった。
得られたCu母合金粉末を分級して、最大粒径:100μm以下のCu母合金粉末を作製した。次いで、このCu母合金粉末を、離型剤を塗布した黒鉛モールドに充填し、温度:800℃、圧力:15MPa、保持時間:30分間の条件でホットプレスすることにより、ホットプレス体を作製した。
このホットプレス体を機械加工して、表12に示される成分組成を有するターゲット2a~2nを作製した。
そして、シャッターを開き、出力:600Wで放電することにより、厚さ:50nmを有し、かつ表13に示される成分組成を有する酸素-Ca(Al,Sn,Sb)銅合金中間体下地層を成膜した。引き続いて酸素の供給を停止し、Arガスのみで0.67Paの圧力でスパッタすることにより、厚さ:250nmを有し、Cuおよび不可避不純物からなるCu層を成膜した。
以上により、本発明例の薄膜トランジスター中間体用複合銅合金膜212~224を成膜した。なお、比較例204において、表12のCaを15モル%を越えて含むターゲットnを用いて、成膜を試みたが、スパッタ開始時に放電が立たなかった。このため、比較例の薄膜トランジスター中間体用複合銅合金膜204は成膜できなかった。
得られた結果を表14に示し、薄膜トランジスター用複合銅合金膜の評価を行った。
なお、薄膜トランジスター用複合銅合金膜に含まれる濃縮層のCa、Al,Sn,Sbおよび酸素の分析は、実施例1と同じ条件で行った。
Claims (6)
- ガラス基板と、
前記ガラス基板の上に形成されたゲート電極膜と、
前記ガラス基板およびゲート電極膜の上に形成された窒化珪素膜と、
前記窒化珪素膜の上に形成されたn-アモルファスSi半導体膜と、
前記n-アモルファスSi半導体膜の上に形成されたn+アモルファスSiオーミック膜と、
前記n+アモルファスSiオーミック膜の上に形成された酸化ケイ素膜からなるバリア膜と、
前記酸化ケイ素膜からなるバリア膜の上に形成されたドレイン電極膜およびソース電極膜を有し、
前記ドレイン電極膜および前記ソース電極膜は、少なくとも前記酸化ケイ素膜からなるバリア膜に接して形成された酸素-カルシウム濃縮層含有銅合金下地層と、前記酸素-カルシウム濃縮層含有銅合金下地層の上に形成されたCu層とからなる複合銅合金膜を有し、
前記酸素-カルシウム濃縮層含有銅合金下地層は、濃縮層を有し、
前記濃縮層は、Ca:2~30モル%、及び酸素:20~50モル%を含有し、残部としてCuおよび不可避不純物を含むことを特徴とする薄膜トランジスター。 - ガラス基板と、
前記ガラス基板の上に形成されたゲート電極膜と、
前記ガラス基板およびゲート電極膜の上に形成された窒化珪素膜と、
前記窒化珪素膜の上に形成されたn-アモルファスSi半導体膜と、
前記n-アモルファスSi半導体膜の上に形成されたn+アモルファスSiオーミック膜と、
前記n+アモルファスSiオーミック膜の上に形成された酸化ケイ素膜からなるバリア膜と、
前記酸化ケイ素膜からなるバリア膜の上に形成されたドレイン電極膜およびソース電極膜を有し、
前記ドレイン電極膜および前記ソース電極膜は、前記酸化ケイ素膜からなるバリア膜に接して形成された酸素-カルシウム含有銅合金下地層と、前記酸素-カルシウム含有銅合金下地層の上に形成されたCu層とからなる複合銅合金膜を有し、
前記酸素-カルシウム含有銅合金下地層は、Ca:0.01~10モル%、及び酸素:1~20モル%を含有し、残部としてCuおよび不可避不純物を含むことを特徴とする薄膜トランジスター中間体。 - ガラス基板と、
前記ガラス基板の上に形成されたゲート電極膜と、
前記ガラス基板およびゲート電極膜の上に形成された窒化珪素膜と、
前記窒化珪素膜の上に形成されたn-アモルファスSi半導体膜と、
前記n-アモルファスSi半導体膜の上に形成されたn+アモルファスSiオーミック膜と、
前記n+アモルファスSiオーミック膜の上に形成された酸化ケイ素膜からなるバリア膜と、
前記酸化ケイ素膜からなるバリア膜の上に形成されたドレイン電極膜およびソース電極膜を有し、
前記ドレイン電極膜および前記ソース電極膜は、少なくとも前記酸化ケイ素膜からなるバリア膜に接して形成された酸素-Ca(Al,Sn,Sb)濃縮層含有銅合金下地層と、前記酸素-Ca(Al,Sn,Sb)濃縮層含有銅合金下地層の上に形成されたCu合金層とからなる複合銅合金膜を有し、
前記酸素-Ca(Al,Sn,Sb)濃縮層含有銅合金下地層は、濃縮層を有する銅合金下地層であり、
前記濃縮層は、Ca:2~30モル%、Al、SnおよびSbから選択される1種または2種以上を合計で1~10モル%、及び酸素:20~50モル%を含有し、残部としてCuおよび不可避不純物を含むことを特徴とする薄膜トランジスター。 - 前記酸素-Ca(Al,Sn,Sb)濃縮層含有銅合金下地層の上に形成されたCu合金層は、Al、SnおよびSbから選択される1種または2種以上を合計で0.05~2モル%を含有し、残部としてCuおよび不可避不純物を含むことを特徴とする請求項3記載の薄膜トランジスター。
- ガラス基板と、
前記ガラス基板の上に形成されたゲート電極膜と、
前記ガラス基板およびゲート電極膜の上に形成された窒化珪素膜と、
前記窒化珪素膜の上に形成されたn-アモルファスSi半導体膜と、
前記n-アモルファスSi半導体膜の上に形成されたn+アモルファスSiオーミック膜と、
前記n+アモルファスSiオーミック膜の上に形成された酸化ケイ素膜からなるバリア膜と、
前記酸化ケイ素膜からなるバリア膜の上に形成されたドレイン電極膜およびソース電極膜を有し、
前記ドレイン電極膜および前記ソース電極膜は、前記酸化ケイ素膜からなるバリア膜に接して形成された酸素-Ca(Al,Sn,Sb)銅合金中間体下地層と、前記酸素-Ca(Al,Sn,Sb)銅合金中間体下地層の上に形成されたCu合金層とからなる複合銅合金膜を有し、
前記酸素-Ca(Al,Sn,Sb)銅合金中間体下地層は、Ca:0.2~10モル%、Al、SnおよびSbから選択される1種または2種以上を合計で0.05~2モル%、及び酸素:1~20モル%を含有し、残部としてCuおよび不可避不純物を含むことを特徴とする薄膜トランジスター中間体。 - 前記酸素-Ca(Al,Sn,Sb)銅合金中間体下地層の上に形成されたCu合金層は、Al、SnおよびSbから選択される1種または2種以上を合計で0.05~2モル%を含有し、残部としてCuおよび不可避不純物を含むことを特徴とする請求項5記載の薄膜トランジスター中間体。
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JP5285710B2 (ja) * | 2008-10-24 | 2013-09-11 | 三菱マテリアル株式会社 | 薄膜トランジスタの製造方法 |
JP5354781B2 (ja) * | 2009-03-11 | 2013-11-27 | 三菱マテリアル株式会社 | バリア層を構成層とする薄膜トランジスターおよび前記バリア層のスパッタ成膜に用いられるCu合金スパッタリングターゲット |
EP2426720A1 (en) * | 2010-09-03 | 2012-03-07 | Applied Materials, Inc. | Staggered thin film transistor and method of forming the same |
JP2012060015A (ja) * | 2010-09-10 | 2012-03-22 | Hitachi Cable Ltd | 電子デバイス配線用Cu合金スパッタリングターゲット材、及び素子構造 |
KR20130139438A (ko) | 2012-06-05 | 2013-12-23 | 삼성디스플레이 주식회사 | 박막 트랜지스터 기판 |
JP6274026B2 (ja) * | 2013-07-31 | 2018-02-07 | 三菱マテリアル株式会社 | 銅合金スパッタリングターゲット及び銅合金スパッタリングターゲットの製造方法 |
CN104064454A (zh) * | 2014-06-11 | 2014-09-24 | 京东方科技集团股份有限公司 | 薄膜及阵列基板的制备方法、阵列基板 |
JP6398594B2 (ja) * | 2014-10-20 | 2018-10-03 | 三菱マテリアル株式会社 | スパッタリングターゲット |
CN106920749A (zh) * | 2015-12-28 | 2017-07-04 | 昆山国显光电有限公司 | 一种薄膜晶体管及其制作方法 |
US10957644B2 (en) * | 2018-02-02 | 2021-03-23 | Micron Technology, Inc. | Integrated structures with conductive regions having at least one element from group 2 of the periodic table |
CN108807518B (zh) * | 2018-05-28 | 2020-09-29 | 深圳市华星光电技术有限公司 | 电极结构及其制备方法、阵列基板 |
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JP2002094069A (ja) * | 2000-09-13 | 2002-03-29 | Casio Comput Co Ltd | 薄膜トランジスタおよびその製造方法 |
JP2008205420A (ja) * | 2006-10-18 | 2008-09-04 | Mitsubishi Materials Corp | 熱欠陥発生が少なくかつ表面状態の良好なtftトランジスターを用いたフラットパネルディスプレイ用配線および電極並びにそれらを形成するためのスパッタリングターゲット |
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CN102165596B (zh) | 2014-07-09 |
CN102165596A (zh) | 2011-08-24 |
KR101527626B1 (ko) | 2015-06-09 |
JP5269533B2 (ja) | 2013-08-21 |
KR20110063736A (ko) | 2011-06-14 |
TWI476930B (zh) | 2015-03-11 |
US20110133190A1 (en) | 2011-06-09 |
TW201029185A (en) | 2010-08-01 |
US8502285B2 (en) | 2013-08-06 |
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