WO2011010415A1 - 薄膜トランジスタ基板の製造方法 - Google Patents
薄膜トランジスタ基板の製造方法 Download PDFInfo
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- WO2011010415A1 WO2011010415A1 PCT/JP2010/001878 JP2010001878W WO2011010415A1 WO 2011010415 A1 WO2011010415 A1 WO 2011010415A1 JP 2010001878 W JP2010001878 W JP 2010001878W WO 2011010415 A1 WO2011010415 A1 WO 2011010415A1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. 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
- H01L29/7869—Thin film transistors, i.e. transistors with a channel being at least partly a thin film having a semiconductor body comprising an oxide semiconductor material, e.g. zinc oxide, copper aluminium oxide, cadmium stannate
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/1222—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition, shape or crystalline structure of the active layer
- H01L27/1225—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition, shape or crystalline structure of the active layer with semiconductor materials not belonging to the group IV of the periodic table, e.g. InGaZnO
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/124—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/1248—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition or shape of the interlayer dielectric specially adapted to the circuit arrangement
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. 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
- H01L29/41—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions
- H01L29/423—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions not carrying the current to be rectified, amplified or switched
- H01L29/42312—Gate electrodes for field effect devices
- H01L29/42316—Gate electrodes for field effect devices for field-effect transistors
- H01L29/4232—Gate electrodes for field effect devices for field-effect transistors with insulated gate
- H01L29/42384—Gate electrodes for field effect devices for field-effect transistors with insulated gate for thin film field effect transistors, e.g. characterised by the thickness or the shape of the insulator or the dimensions, the shape or the lay-out of the conductor
Definitions
- the present invention relates to a method for manufacturing a thin film transistor substrate, and particularly to a method for manufacturing a thin film transistor substrate constituting a display panel.
- An active matrix drive type liquid crystal display panel includes, for example, a TFT substrate in which a thin film transistor (hereinafter referred to as “TFT”) is provided as a switching element for each pixel which is the minimum unit of an image.
- TFT thin film transistor
- the TFT substrate forms a resist pattern by exposing the photosensitive resin film through a photomask, and is exposed from the resist pattern. It can be manufactured by repeating a series of steps of etching the film to be etched.
- Patent Document 1 discloses a method for manufacturing a TFT substrate in which the number of photomasks is reduced by forming resist patterns having three types of film thickness using a halftone pattern photomask. .
- a silicon film is formed as a semiconductor film and an oxide conductive film is formed separately as a pixel electrode.
- an oxide semiconductor film is used as a semiconductor film. A next-generation high-performance TFT using the above has been proposed.
- Patent Document 2 discloses a TFT array in which a pixel electrode is configured by an oxide semiconductor film that configures a TFT, and a manufacturing method thereof.
- FIG. 13 (a) to 13 (f) are cross-sectional views for explaining the manufacturing process of the TFT substrate 150 corresponding to the TFT array disclosed in Patent Document 2.
- FIG. 13 (a) to 13 (f) are cross-sectional views for explaining the manufacturing process of the TFT substrate 150 corresponding to the TFT array disclosed in Patent Document 2.
- the TFT substrate 150 includes, for example, a plurality of gate lines (not shown) provided so as to extend in parallel with each other, and a plurality of source lines provided so as to extend in parallel with each other in a direction orthogonal to each gate line. 113 (see FIG. 13F) and a plurality of TFTs 105 provided for each intersection of each gate line and each source line 113, that is, for each pixel which is the minimum unit of an image (see FIG. 13F). ) And a plurality of pixel electrodes (114c, see FIG. 13 (f)) provided in a matrix and connected to the TFTs 105, respectively.
- a display area for displaying an image is defined in an area where a plurality of pixel electrodes are arranged in a matrix, and a non-display area is defined around the display area.
- the gate line is connected to a connection wiring formed of the same material in the same layer as the source line 113 through a contact hole formed in the gate insulating film 112 described later. ing.
- the TFT 105 includes a gate electrode 111 that is a part or protrusion of the gate line provided on the glass substrate 110 and a gate provided so as to cover the gate electrode 111.
- An insulating film 112 and a semiconductor layer 114 provided over the gate insulating film 112 so as to overlap the gate electrode 111 are provided.
- the semiconductor layer 114 is provided adjacent to the channel region 114a provided so as to overlap the gate electrode 111 and the left side of the channel region 114a in the drawing.
- a source region 114b connected to the source line 113 and a drain region 114c provided adjacent to the right side of the channel region 114a in the drawing and constituting the pixel electrode are provided.
- a gate electrode 111 is formed on a glass substrate 110 using a first photomask.
- a gate insulating film 112 that covers the gate electrode 111 and has a contact hole (not shown) in the non-display region is formed. To do.
- a source line 113 is formed on the gate insulating film 112 as shown in FIG.
- an oxide semiconductor layer 114 is formed over the gate insulating film 112 and the source line 113 as illustrated in FIG.
- an interlayer insulating film 115 is formed over the source wiring 113 and the oxide semiconductor layer 114 as shown in FIG.
- the oxide semiconductor layer 114 exposed from the interlayer insulating film 115 is treated with plasma P to reduce the resistance, so that a channel region 114a, a source region 114b, and a drain region (see FIG. 13F).
- Pixel electrode) 114c is formed.
- the TFT substrate 150 can be manufactured using five photomasks.
- the characteristics of the TFT 105 may be deteriorated. Further, five photomasks are required for the manufacture thereof, but the source region 114b is not covered with the interlayer insulating film 115 in the oxide semiconductor layer 114 other than the drain region 114c functioning as the pixel electrode.
- the potential of the source line 113 is directly applied to the liquid crystal layer, and an additional process for covering the source region 114b with some insulating film is necessary in the actual manufacturing process. There is room for improvement.
- the present invention has been made in view of the above points, and an object of the present invention is to provide a thin film transistor having an excellent characteristic using an oxide semiconductor and a thin film transistor substrate having a wiring connection structure at an end portion of the substrate. It is to manufacture at low cost.
- an oxide semiconductor film that constitutes a pixel electrode is not patterned alone, but a portion of the oxide semiconductor film that constitutes a thin film transistor is covered with an interlayer insulating film. is there.
- a method of manufacturing a thin film transistor substrate according to the present invention includes a gate layer forming step of forming a gate electrode and a first wiring on the substrate, and a first insulating film so as to cover the gate electrode and the first wiring.
- the conductive film is patterned to intersect the first wiring and the source electrode and the drain electrode that are provided so as to overlap the gate electrode and to be separated from each other.
- the gate layer forming step for example, after the (first) conductive film is formed on the substrate, it is exposed from the first resist pattern formed using the first photomask ( The first conductive film is patterned to form a gate electrode and a first wiring. Subsequently, in the gate insulating film forming step, the first insulating film is formed on the gate electrode and the first wiring, and then exposed from the second resist pattern formed using the second photomask. The insulating film 1 is patterned to form a gate insulating film having a contact hole for forming a wiring connection structure at the substrate end.
- the source layer forming step after forming the (second) conductive film on the gate insulating film, the (second) conductive exposed from the third resist pattern formed using the third photomask.
- the film is patterned to form a source electrode, a drain electrode, and a second wiring.
- a wiring connection structure is specifically configured at the substrate end.
- an oxide semiconductor film and a second insulating film are sequentially formed over the source electrode, the drain electrode, and the second wiring, and then formed using a fourth photomask.
- the second insulating film exposed from the resist pattern is patterned to form an interlayer insulating film.
- the thin film transistor substrate is manufactured using the first, second, third and fourth photomasks, so that the thin film transistor substrate having the wiring connection structure at the end of the substrate is as low as possible. Manufactured at a cost. Further, in the manufactured thin film transistor substrate, the portion of the oxide semiconductor film that constitutes the thin film transistor is covered with the interlayer insulating film, so that damage is caused by plasma supplied for lowering resistance. Since it is difficult to receive, the characteristics of the thin film transistor are improved. Therefore, a thin film transistor having favorable characteristics using an oxide semiconductor and a thin film transistor substrate having a wiring connection structure at the edge of the substrate are manufactured at as low a cost as possible.
- the method of manufacturing a thin film transistor substrate according to the present invention includes a gate layer forming step of forming a gate electrode and a first wiring on the substrate, a first insulating film and an oxide so as to cover the gate electrode and the first wiring. After sequentially forming the physical semiconductor film, the stacked film of the first insulating film and the oxide semiconductor film is patterned so that a contact hole is formed at a position overlapping the first wiring, and the gate insulating film is formed.
- An electrode and a drain electrode and a second wiring provided so as to intersect the first wiring and connected to the first wiring through the contact hole are formed.
- the gate layer forming step for example, after the (first) conductive film is formed on the substrate, it is exposed from the first resist pattern formed using the first photomask ( The first conductive film is patterned to form a gate electrode and a first wiring. Subsequently, in the gate insulating film formation step, the first insulating film and the oxide semiconductor film are sequentially formed over the gate electrode and the first wiring, and then the second insulating film is formed using the second photomask. The laminated film of the first insulating film and the oxide semiconductor film exposed from the resist pattern is patterned to form a gate insulating film having a contact hole for forming a wiring connection structure at the edge of the substrate.
- the (second) conductive film is formed on the oxide semiconductor film, it is exposed from the third resist pattern formed using the third photomask (second).
- the conductive film is patterned to form a source electrode, a drain electrode, and a second wiring.
- the first wiring and the second wiring are connected to each other through a contact hole formed in the gate insulating film (a stacked film of the first insulating film and the oxide semiconductor film), the end portion of the substrate The wiring connection structure is specifically configured.
- a second insulating film is formed over the source electrode, the drain electrode, and the second wiring, and then exposed from the fourth resist pattern formed using the fourth photomask.
- the second insulating film is patterned to form an interlayer insulating film.
- the resistance of the oxide semiconductor film exposed from the interlayer insulating film is reduced to form a pixel electrode.
- the thin film transistor substrate is manufactured using the first, second, third and fourth photomasks, so that the thin film transistor substrate having the wiring connection structure at the end of the substrate is as low as possible. Manufactured at a cost.
- the portion of the oxide semiconductor film that constitutes the thin film transistor is covered with the interlayer insulating film, so that damage is caused by plasma supplied for lowering resistance. Since it is difficult to receive, the characteristics of the thin film transistor are improved. Therefore, a thin film transistor having favorable characteristics using an oxide semiconductor and a thin film transistor substrate having a wiring connection structure at the edge of the substrate are manufactured at as low a cost as possible.
- the gate electrode may be formed wide so as to reach a boundary between the drain electrode formed in the source layer forming step and the pixel electrode formed in the pixel electrode forming step.
- the gate electrode is formed wide so as to reach the boundary between the drain electrode and the pixel electrode, when the gate electrode is held at a high voltage, the semiconductor layer under the drain electrode is low.
- the drain electrode and the pixel electrode are reliably connected to each other.
- the method of manufacturing a thin film transistor substrate according to the present invention includes a gate layer forming step of forming a gate electrode and a first wiring on the substrate, a first insulating film and a conductive layer so as to cover the gate electrode and the first wiring. After sequentially forming the films, the stacked film of the first insulating film and the conductive film is patterned so that a contact hole is formed at a position overlapping the first wiring, thereby forming a gate insulating film.
- the second insulating film is patterned to form an interlayer insulating film, and the resistance of the oxide semiconductor film exposed from the interlayer insulating film is reduced.
- the gate layer forming step for example, after the (first) conductive film is formed on the substrate, it is exposed from the first resist pattern formed using the first photomask ( The first conductive film is patterned to form a gate electrode and a first wiring. Subsequently, in the gate insulating film forming step, a first insulating film and a (second) conductive film are sequentially formed on the gate electrode and the first wiring, and then formed using a second photomask. The laminated film of the first insulating film and the (second) conductive film exposed from the second resist pattern is patterned to form a gate insulating film having a contact hole for forming a wiring connection structure at the substrate end. To do.
- the source electrode, the drain electrode, and the second wiring are formed by patterning the (second) conductive film exposed from the third resist pattern formed using the third photomask.
- the interlayer insulating film formation step an oxide semiconductor film and a second insulating film are sequentially formed over the source electrode, the drain electrode, and the second wiring, and then formed using a fourth photomask.
- the second insulating film exposed from the resist pattern is patterned to form an interlayer insulating film.
- the resistance of the oxide semiconductor film exposed from the interlayer insulating film is reduced to form the pixel electrode, and the first wiring and the second wiring are made conductive.
- the first wiring and the second wiring reduce the resistance of the oxide semiconductor film inside the contact hole formed in the gate insulating film (laminated film of the first insulating film and the second conductive film). Since they are connected to each other via the conductive portions, a wiring connection structure is specifically configured at the end of the substrate.
- the thin film transistor substrate is manufactured using the first, second, third and fourth photomasks, so that the thin film transistor substrate having the wiring connection structure at the end of the substrate is as low as possible. Manufactured at a cost.
- the portion of the oxide semiconductor film that constitutes the thin film transistor is covered with the interlayer insulating film, so that damage is caused by plasma supplied for lowering resistance. Since it is difficult to receive, the characteristics of the thin film transistor are improved. Therefore, a thin film transistor having favorable characteristics using an oxide semiconductor and a thin film transistor substrate having a wiring connection structure at the edge of the substrate are manufactured at as low a cost as possible.
- the gate insulating film forming step includes forming a photosensitive resin film on the conductive film and exposing the photosensitive resin film in halftone to form a resist pattern provided with a recess; Etching the laminated film of the first insulating film and the conductive film exposed from the resist pattern to form the contact hole.
- the resist pattern is thinned.
- the conductive film exposed by removing the bottom of the concave portion of the resist pattern may be etched and patterned.
- the gate insulating film forming step first, the first insulating film, the (second) conductive film, and the photosensitive resin film are sequentially formed on the gate electrode and the first wiring.
- a second resist pattern having a recess is formed by exposing the photosensitive resin film with halftone using a second photomask.
- the stacked film of the first insulating film and the (second) conductive film exposed from the second resist pattern is etched to form a gate insulating film having a contact hole.
- the second resist pattern is thinned to remove the bottom of the concave portion of the second resist pattern, and the exposed (second) conductive film is etched to form the source electrode
- the drain electrode and the second wiring are formed.
- the third photomask described above becomes unnecessary, and the thin film transistor substrate is manufactured using the first, second, and fourth photomasks, so that the thin film transistor substrate can be manufactured at a lower cost. Is done.
- the oxide semiconductor film exposed from the interlayer insulating film may be subjected to plasma treatment.
- the so-called threshold voltage (Vth) of the thin film transistor is shifted to the negative side.
- the resistance of the oxide semiconductor film exposed from the interlayer insulating film, that is, the pixel electrode is specifically reduced.
- impurities may be implanted into the oxide semiconductor film exposed from the interlayer insulating film.
- the so-called threshold voltage (Vth) of the thin film transistor is shifted to the negative side.
- the resistance of the oxide semiconductor film exposed from the interlayer insulating film, that is, the pixel electrode is specifically reduced.
- the oxide semiconductor film exposed from the interlayer insulating film may be thinned by etching.
- the oxide semiconductor film exposed from the interlayer insulating film is thinly etched, so that the so-called threshold voltage (Vth) of the thin film transistor is shifted to the negative side.
- Vth threshold voltage
- the resistance of the oxide semiconductor film exposed from the interlayer insulating film, that is, the pixel electrode is specifically reduced.
- the second wiring may be a source line conducting to the source electrode, and the first wiring may be a first connection wiring for connecting to the source line.
- the source line is made of the same material in the same layer as the gate electrode. It is drawn out to the terminal region of the non-display region at the end of the substrate through the formed first connection wiring.
- the first wiring may be a gate line conducting to the gate electrode, and the second wiring may be a second connection wiring for connecting to the gate line.
- the gate line is in the same layer as the source electrode. Is drawn out to the terminal region of the non-display region at the end of the substrate through the second connection wiring formed in step (1).
- an oxide semiconductor film is used because the oxide semiconductor film constituting the pixel electrode is covered with the interlayer insulating film without covering the portion of the oxide semiconductor film that constitutes the thin film transistor without patterning alone.
- a thin film transistor having favorable characteristics and a thin film transistor substrate provided with a wiring connection structure at an end portion of the substrate can be manufactured at as low a cost as possible.
- FIG. 1 is a plan view of a TFT substrate 50aa according to the first embodiment.
- FIG. 2 is a cross-sectional view of the display area for explaining the manufacturing process of the TFT substrate 50aa.
- FIG. 3 is a cross-sectional view of a non-display area for explaining a manufacturing process of the TFT substrate 50aa.
- FIG. 4 is a graph showing the characteristics of the TFT 5a constituting the TFT substrate 50aa.
- FIG. 5 is a cross-sectional view of the TFT substrate 50ab according to the first embodiment.
- FIG. 6 is a cross-sectional view of the TFT substrate 50ac according to the first embodiment.
- FIG. 7 is a cross-sectional view of a display region for explaining a manufacturing process of the TFT substrate 50b according to the second embodiment.
- FIG. 8 is a cross-sectional view of the non-display area for explaining the manufacturing process of the TFT substrate 50b.
- FIG. 9 is a cross-sectional view of a display region for explaining a manufacturing process of the TFT substrate 50c according to the third embodiment.
- FIG. 10 is a cross-sectional view of the non-display area for explaining the manufacturing process of the TFT substrate 50c.
- FIG. 11 is a cross-sectional view of a display region for explaining a manufacturing process of the TFT substrate 50d according to the fourth embodiment.
- FIG. 12 is a cross-sectional view of a non-display area for explaining a manufacturing process of the TFT substrate 50d.
- FIG. 13 is a cross-sectional view for explaining a manufacturing process of the conventional TFT substrate 150.
- Embodiment 1 of the Invention 1 to 6 show Embodiment 1 of a method for manufacturing a thin film transistor substrate according to the present invention.
- FIG. 1 is a plan view of the TFT substrate 50aa according to the first embodiment.
- FIGS. 2A to 2F are cross-sectional views of the display area for explaining the manufacturing process of the TFT substrate 50aa.
- FIGS. 3A to 3D are cross-sectional views of the non-display area for explaining the manufacturing process of the TFT substrate 50aa.
- FIG. 2F is also a cross-sectional view of the TFT substrate 50aa along the line II-II in FIG.
- FIG. 4 is a graph showing the characteristics of the TFT 5 constituting the TFT substrate 50aa.
- the TFT substrate 50aa includes a glass substrate 10, a plurality of gate lines 11 provided on the glass substrate 10 so as to extend in parallel to each other, and orthogonal to each gate line 11.
- a plurality of source lines 13c provided so as to extend in parallel to each other in the direction to be aligned, and a plurality of each provided at each intersection of each gate line 11 and each source line 13c, that is, for each pixel which is the minimum unit of an image TFT 5a, an interlayer insulating film 15a provided so as to cover each TFT 5a, and a plurality of pixel electrodes respectively provided in a plurality of openings formed in a matrix in the interlayer insulating film 15a and connected to each TFT 5a.
- a plurality of pixels are arranged in a matrix, thereby defining a display area for performing image display and a non-display area around the display area.
- the gate line 11 extends to the non-display area, and is connected to the second connection wiring 13d through a contact hole 12b formed in the gate insulating film 12a in order to form a wiring connection structure at the substrate end. (See FIGS. 3C and 3D).
- the TFT 5a includes a gate electrode 11a provided on the glass substrate 10, a gate insulating film 12a provided so as to cover the gate electrode 11a, and the gate insulating film 12a.
- the source electrode 13a and the drain electrode 13b are provided so as to overlap the gate electrode 11a and are separated from each other, and the gate electrode 11a is provided on the gate insulating film 12a so as to overlap the source electrode 13a and the drain electrode 13b.
- a semiconductor layer 14a is provided.
- the gate electrode 11a is a portion protruding to the side of the gate line 11
- the source electrode 13a is a portion protruding to the side of the source line 13c
- the semiconductor layer 14a is connected to the source region.
- the drain electrode 13b is connected to the drain region of the semiconductor layer 14a and the pixel electrode 14b.
- the semiconductor layer 14a and the pixel electrode 14b are made of transparent materials such as IGZO (In—Ga—Zn—O), ISiZO (In—Si—Zn—O), and IAlZO (In—Al—Zn—O), for example.
- An oxide semiconductor film is used.
- the pixel electrode 14b is a portion exposed from the interlayer insulating film 15a of the oxide semiconductor film 14 as shown in FIGS. 2E and 2F. As shown in FIG. The electrical resistance is lower than 14a.
- the curve Ca shows the characteristics of the TFT 5a having the semiconductor layer 14a
- the curve Cb shows the characteristics of the TFT having a semiconductor layer corresponding to the pixel electrode 14b with reduced resistance.
- the oxide semiconductor film Even if the oxide semiconductor film is used as it is as the pixel electrode, the electric resistance is high when the gate voltage Vg is 0 V (see curve Ca in FIG. 4), so that the oxide semiconductor film is used as the pixel electrode.
- the threshold voltage (Vth) of the TFT shifts to the negative side due to the plasma treatment of the oxide semiconductor film with N 2 O or hydrogen (see curve Cb in FIG. 4).
- the oxide semiconductor film can be used as the pixel electrode by making the electrical resistance when the gate voltage Vg is 0 V to be about the ON resistance.
- the TFT substrate 50aa having the above configuration constitutes a liquid crystal display panel together with, for example, a CF (Color Filter) substrate disposed opposite to the TFT substrate 50aa and a liquid crystal layer sealed between the two substrates.
- CF Color Filter
- the manufacturing method of this embodiment includes a gate layer forming step, a gate insulating film forming step, a source layer forming step, an interlayer insulating film forming step, and a pixel electrode forming step.
- a first metal conductive film such as an aluminum film, a copper film, or a titanium film is formed to a thickness of about 3000 mm on the entire glass substrate 10 having a thickness of 0.7 mm by sputtering. To do.
- a first resist pattern (not shown) is formed by patterning using the shown.
- the first resist pattern is peeled off, so that it is shown in FIGS. 2 (a) and 3 (a).
- the gate electrode 11a and the gate line 11 are formed.
- a first inorganic insulating film 12 (such as a silicon nitride film or a silicon oxide film) is formed on the entire substrate on which the gate electrode 11a and the gate line 11 are formed in the gate layer forming step by a plasma CVD (Chemical Vapor Deposition) method. 3B) is formed with a thickness of about 4000 mm.
- the photosensitive resin film is applied to a second photomask (not shown).
- a second resist pattern is formed by patterning using the shown.
- the second resist pattern is peeled off to obtain the state shown in FIGS. 2B and 3B. As shown, a gate insulating film 12a having a contact hole 12b is formed.
- a second metal conductive film 13 such as an aluminum film, a copper film, or a titanium film is formed on the entire substrate on which the gate insulating film 12a has been formed in the gate insulating film forming step by sputtering (see FIG. 2C). Is formed with a thickness of about 3000 mm.
- a third resist pattern (not shown) is formed by patterning using the shown.
- a source electrode 13a and a drain electrode 13b are obtained. Then, the source line 13c and the second connection wiring 13d are formed.
- an oxide semiconductor such as IGZO, ISiZO, or IAlZO is formed by sputtering on the entire substrate on which the source electrode 13a, the drain electrode 13b, the source line 13c, and the second connection wiring 13d are formed in the source layer forming step.
- the film 14 is formed with a thickness of about 1000 mm (see FIGS. 2D and 3D).
- a silicon nitride film, a silicon oxide film, or the like is formed on the entire substrate on which the oxide semiconductor film 14 has been formed by sputtering or plasma CVD.
- the second inorganic insulating film 15 is formed with a thickness of about 3000 mm.
- the photosensitive resin film is used for the 4th photomask (not shown).
- an interlayer insulating film 15a is formed as shown in FIG.
- the oxide semiconductor film 14 (see FIG. 2E) exposed from the interlayer insulating film 15a formed in the interlayer insulating film forming step is reduced with hydrogen, argon, oxygen, or the like.
- the resistance of the oxide semiconductor film 14 exposed from the interlayer insulating film 15a is reduced to form the pixel electrode 14b, and the semiconductor layer 14a is formed below the interlayer insulating film 15a.
- the interlayer insulating film forming step and the pixel electrode forming step are shown as separate steps.
- the second inorganic insulating film 15 is dry-etched. After removing and subsequently treating with the reducing plasma P, the manufacturing process can be shortened by peeling off the fourth resist pattern.
- the TFT substrate 50aa of this embodiment can be manufactured.
- the first metal conductive film is formed on the glass substrate 10, and then the first photomask is used.
- the first metal conductive film exposed from the first resist pattern formed in this way is patterned to form the gate electrode 11a and the gate line (first wiring) 11.
- the gate insulating film formation step after the first inorganic insulating film is formed on the gate electrode 11a and the gate line 11, it is exposed from the second resist pattern formed using the second photomask.
- the first inorganic insulating film is patterned to form a gate insulating film 12a having a contact hole 12b for forming a wiring connection structure at the substrate end.
- the second metal conductive film exposed from the third resist pattern formed using the third photomask are patterned to form a source electrode 13a, a drain electrode 13b, a source line 13c, and a second connection wiring (second wiring) 13d.
- the wiring connection structure can be specifically configured at the substrate end. it can.
- the interlayer insulating film forming step after the oxide semiconductor film 14 and the second inorganic insulating film 15 are sequentially formed on the source electrode 13a, the drain electrode 13b, the source line 13c, and the second connection wiring 13d, The second inorganic insulating film 15 exposed from the fourth resist pattern formed using the photomask is patterned to form an interlayer insulating film 15a.
- the resistance of the oxide semiconductor film 14 exposed from the interlayer insulating film 15a is reduced to form the pixel electrode 14b.
- the TFT substrate 50aa can be manufactured using the first, second, third and fourth photomasks, so that the TFT substrate having the wiring connection structure at the end portion of the substrate is possible.
- the portion (semiconductor layer 14a) constituting the TFT 5a of the oxide semiconductor film 14 is covered with the interlayer insulating film 15a, thereby reducing the resistance. Since it is hard to receive damage from the reducing plasma P etc. which are supplied, the characteristic of TFT5a can be made favorable. Therefore, a TFT substrate having an excellent characteristic using an oxide semiconductor and a TFT substrate provided with a wiring connection structure at an end portion of the substrate can be manufactured at as low a cost as possible.
- the oxide semiconductor film 14 exposed from the interlayer insulating film 15a is subjected to plasma treatment to reduce the resistance of a part of the oxide semiconductor film 14 and form the pixel electrode 14b.
- an impurity H such as hydrogen ions is implanted into the oxide semiconductor film 14 exposed from the interlayer insulating film 15a like the TFT substrate 50ab shown in FIG.
- the pixel electrode 14c may be formed by reducing the resistance of the portion, and the oxide semiconductor film 14 exposed from the interlayer insulating film 15a is thinned by wet etching as in the TFT substrate 50ac shown in FIG. Accordingly, the pixel electrode 14d may be formed by reducing the resistance of part of the oxide semiconductor film 14.
- FIG. 7 is a cross-sectional view of the display area for explaining the manufacturing process of the TFT substrate 50b of this embodiment
- FIG. 8 is a cross-sectional view of the non-display area for explaining the manufacturing process of the TFT substrate 50b.
- the same portions as those in FIGS. 1 to 6 are denoted by the same reference numerals, and detailed description thereof is omitted.
- the TFT 5a in which the source electrode 13a and the drain electrode 13 are arranged in the lower layer of the semiconductor layer 14a is illustrated.
- the source electrode 24a and the drain electrode 24b are arranged in the upper layer of the semiconductor layer 23aa.
- the TFT 5b is exemplified.
- the TFT substrate 50b is orthogonal to the glass substrate 20, a plurality of gate lines (not shown) provided on the glass substrate 20 so as to extend in parallel to each other, and the gate lines.
- a plurality of source lines 24c (see FIGS. 8D and 8E) provided so as to extend in parallel with each other in the direction, and each intersection of each gate line and each source line 24c, that is, each pixel
- a plurality of TFTs 5b provided in each of the layers, an interlayer insulating film 25a provided so as to cover each TFT 5b, and a plurality of openings formed in a matrix in the interlayer insulating film 25a, and connected to each TFT 5b.
- a plurality of pixel electrodes 23ab is arranged.
- the source line 24c extends to the non-display region and is connected to the first connection wiring 21b through a contact hole 23b formed in the gate insulating film 22a in order to form a wiring connection structure at the substrate end. (See FIG. 8D and FIG. 8E).
- the TFT 5b includes a gate electrode 21a provided on the glass substrate 20, a gate insulating film 22a provided to cover the gate electrode 21a, and a gate electrode on the gate insulating film 22a.
- a semiconductor layer 23aa provided so as to overlap with 21a
- a source electrode 24a and a drain electrode 24b provided on the semiconductor layer 23aa so as to overlap with the gate electrode 21a and to be separated from each other.
- the gate electrode 21a is a portion protruding to the side of the gate line
- the source electrode 24a is a portion protruding to the side of the source line 24c, and is connected to the source region of the semiconductor layer 23aa.
- the drain electrode 24b is connected to the drain region of the semiconductor layer 23aa and the pixel electrode 23ab.
- the semiconductor layer 23aa and the pixel electrode 23ab are formed of, for example, a transparent oxide semiconductor film such as an IGZO system, an ISiZO system, and an IAlZO system.
- the pixel electrode 23ab is a portion exposed from the interlayer insulating film 25a of the oxide semiconductor film 23 (oxide semiconductor layer 23a). The electrical resistance is lower than that of 23aa.
- the TFT substrate 50b configured as described above constitutes a liquid crystal display panel together with, for example, a CF substrate disposed opposite to the TFT substrate and a liquid crystal layer sealed between the two substrates.
- the manufacturing method of this embodiment includes a gate layer forming step, a gate insulating film forming step, a source layer forming step, an interlayer insulating film forming step, and a pixel electrode forming step.
- a first metal conductive film such as an aluminum film, a copper film, or a titanium film is formed to a thickness of about 3000 mm on the entire substrate of the glass substrate 20 having a thickness of 0.7 mm by sputtering. To do.
- a first resist pattern (not shown) is formed by patterning using the shown.
- the first resist pattern is peeled off, so that it is shown in FIGS. 7A and 8A.
- the gate line, the gate electrode 21a, and the first connection wiring 21b are formed.
- the first inorganic insulating film 22 such as a silicon nitride film or a silicon oxide film is formed on the entire substrate on which the gate line, the gate electrode 21a, and the first connection wiring 21b are formed in the gate layer forming process by a plasma CVD method.
- a film is formed with a thickness of about 4000 mm (see FIGS. 7B and 8B).
- the entire substrate on which the first inorganic insulating film 22 is formed is oxidized by an IGZO-based, ISiZO-based, IAlZO-based, or the like by sputtering.
- the physical semiconductor film 23 is formed with a thickness of about 1000 mm.
- a second resist pattern Ra (see FIGS. 7B and 8B) having a recess D is formed by exposing R in halftone using a second photomask.
- the contact hole 23b is formed as shown in FIG. A gate insulating film 22a is formed.
- the second modified resist pattern Rb (see FIG. 7B) from which the bottom B of the recess D of the second resist pattern Ra has been removed is obtained.
- the second modified resist pattern Rb is peeled off, thereby oxidizing the oxide semiconductor film 23 as shown in FIG.
- the physical semiconductor layer 23a is formed.
- a second metal conductive film 24 such as an aluminum film, a copper film, or a titanium film is formed on the entire substrate on which the gate insulating film 22a and the oxide semiconductor layer 23a are formed in the gate insulating film forming step by sputtering (FIG. 7 (d)) with a thickness of about 3000 mm.
- a photosensitive resin film (not shown) is applied to the entire substrate on which the second metal conductive film 24 has been formed by spin coating
- the photosensitive resin film is applied to a third photomask (not shown).
- a third resist pattern (not shown) is formed by patterning using the shown.
- the source electrode 24a and the drain electrode 24b are formed. And the source line 24c is formed.
- a second inorganic insulating film such as a silicon nitride film or a silicon oxide film is formed on the entire substrate on which the source electrode 24a, the drain electrode 24b, and the source line 24c are formed in the source layer forming step by a sputtering method or a plasma CVD method.
- 25 is formed with a thickness of about 3000 mm.
- the photosensitive resin film is used for the 4th photomask (not shown).
- an interlayer insulating film 25a is formed as shown in FIGS. 7 (e) and 8 (e). .
- ⁇ Pixel electrode formation process> The oxide semiconductor layer 23a (see FIG. 7E) exposed from the interlayer insulating film 25a formed in the interlayer insulating film forming step is treated with a reducing plasma P as shown in FIG. Thus, the resistance of the oxide semiconductor layer 23a exposed from the interlayer insulating film 25a is reduced to form the pixel electrode 23ab, and the semiconductor layer 23aa is formed below the interlayer insulating film 25a.
- the TFT substrate 50b of this embodiment can be manufactured.
- the first photomask is used.
- the first metal conductive film exposed from the first resist pattern formed in this way is patterned to form a gate line, a gate electrode 21a, and a first connection wiring (first wiring) 21b.
- the first inorganic insulating film 22 and the oxide semiconductor film 23 are sequentially formed over the gate line, the gate electrode 21a, and the first connection wiring 21b, and then the second photomask.
- a gate insulating film 22a having the structure is formed.
- the second metal conductive film 24 is formed over the oxide semiconductor layer 23a, the second metal exposed from the third resist pattern formed using the third photomask.
- the conductive film 24 is patterned to form a source electrode 24a, a drain electrode 24b, and a source line (second wiring) 24c.
- the first connection wiring 21b and the source line 24c are connected to each other through a contact hole 23b formed in the gate insulating film 22a (a laminated film of the first inorganic insulating film 22 and the oxide semiconductor film 23). Therefore, the wiring connection structure can be specifically configured at the end portion of the substrate. Further, in the interlayer insulating film forming step, the fourth resist pattern formed using the fourth photomask after forming the second inorganic insulating film 25 on the source electrode 24a, the drain electrode 24b, and the source line 24c. The second inorganic insulating film 25 exposed from the substrate is patterned to form an interlayer insulating film 25a.
- the TFT substrate 50b can be manufactured using the first, second, third and fourth photomasks, so that the TFT substrate having the wiring connection structure at the end of the substrate is made possible. Can be manufactured at low cost. Further, in the manufactured TFT substrate 50b, the portion (semiconductor layer 23aa) constituting the TFT 5b of the oxide semiconductor film is covered with the interlayer insulating film 25a, thereby supplying for the reduction in resistance. Since it is hard to receive damage from the plasma P etc. which are performed, the characteristic of TFT5b can be made favorable. Therefore, a TFT substrate having an excellent characteristic using an oxide semiconductor and a TFT substrate provided with a wiring connection structure at an end portion of the substrate can be manufactured at as low a cost as possible.
- the gate electrode 21a is formed wide so as to reach the boundary between the drain electrode 24b and the pixel electrode 23ab, so that the gate electrode 21a is held at a high voltage. Even when the resistance of the semiconductor layer 23aa under the drain electrode 24b is reduced and the source electrode 24a and the drain electrode 24b are formed on the semiconductor layer 23aa, the drain electrode 24b and the pixel electrode 23ab are connected to each other. It can be securely connected.
- FIG. 9 is a cross-sectional view of the display area for explaining the manufacturing process of the TFT substrate 50c of this embodiment
- FIG. 10 is a cross-sectional view of the non-display area for explaining the manufacturing process of the TFT substrate 50c. .
- the oxide semiconductor film 23 in the non-display area is removed using the resist pattern formed by halftone exposure. In the manufacturing method, the oxide semiconductor film 33 in the non-display region is not removed.
- the TFT substrate 50c is orthogonal to the glass substrate 30, a plurality of gate lines (not shown) provided on the glass substrate 30 so as to extend in parallel with each other, and the gate lines.
- a plurality of source lines 34c (see FIGS. 10D and 10E) provided so as to extend in parallel with each other in the direction and each intersection of each gate line and each source line 34c, that is, each pixel
- a plurality of TFTs 5c provided in each of the layers, an interlayer insulating film 35a provided so as to cover each TFT 5c, and a plurality of openings formed in a matrix in the interlayer insulating film 35a, and connected to each TFT 5c.
- a plurality of pixel electrodes 33ab is a plurality of pixel electrodes 33ab.
- the source line 34c extends to the non-display region, and via a contact hole 33b formed in the stacked film of the gate insulating film 32a and the oxide semiconductor layer 33a in order to form a wiring connection structure at the substrate end. Are connected to the first connection wiring 31b (see FIG. 10D and FIG. 10E).
- the TFT 5c includes a gate electrode 31a provided on the glass substrate 30, a gate insulating film 32a provided to cover the gate electrode 31a, and a gate electrode on the gate insulating film 32a.
- the semiconductor layer 33aa provided so as to overlap with 31a
- the source electrode 34a and the drain electrode 34b provided on the semiconductor layer 33aa so as to overlap with the gate electrode 31a and to be separated from each other.
- the gate electrode 31a is a portion protruding to the side of the gate line
- the source electrode 34a is a portion protruding to the side of the source line 34c, and is connected to the source region of the semiconductor layer 33aa.
- the drain electrode 34b is connected to the drain region of the semiconductor layer 33aa and the pixel electrode 33ab.
- the semiconductor layer 33aa and the pixel electrode 33ab are formed of, for example, a transparent oxide semiconductor film such as IGZO, ISiZO, or IAlZO.
- the pixel electrode 33ab is a portion exposed from the interlayer insulating film 35a of the oxide semiconductor film 33 (oxide semiconductor layer 33a). The electric resistance is lower than 33aa.
- the TFT substrate 50c having the above configuration constitutes a liquid crystal display panel together with, for example, a CF substrate disposed opposite to the TFT substrate and a liquid crystal layer sealed between the two substrates.
- the manufacturing method of this embodiment includes a gate layer forming step, a gate insulating film forming step, a source layer forming step, an interlayer insulating film forming step, and a pixel electrode forming step.
- a first metal conductive film such as an aluminum film, a copper film, or a titanium film is formed to a thickness of about 3000 mm on the entire substrate of the glass substrate 30 having a thickness of 0.7 mm by sputtering. To do.
- a first resist pattern (not shown) is formed by patterning using the shown.
- the first resist pattern is peeled off, and as shown in FIGS. 9A and 10A. In this manner, the gate line, the gate electrode 31a, and the first connection wiring 31b are formed.
- the first inorganic insulating film 32 such as a silicon nitride film or a silicon oxide film is formed on the entire substrate on which the gate line, the gate electrode 31a, and the first connection wiring 31b are formed by the above-described gate layer formation process by a plasma CVD method.
- a film is formed with a thickness of about 4000 mm (see FIGS. 9B and 10B).
- the entire substrate on which the first inorganic insulating film 32 is formed is oxidized by an IGZO-based, ISiZO-based, IAlZO-based, or the like by sputtering.
- the physical semiconductor film 33 is formed with a thickness of about 1000 mm.
- a photosensitive resin film (not shown) is applied to the entire substrate on which the oxide semiconductor film 33 is formed by spin coating, the photosensitive resin film is applied to a second photomask (not shown).
- a second resist pattern (not shown) is formed by patterning with use.
- the second resist pattern is peeled off, whereby FIG. As shown in c), the gate insulating film 32a (and the oxide semiconductor layer 33a) having the contact hole 33b is formed.
- a second metal conductive film 34 such as an aluminum film, a copper film, or a titanium film is formed on the entire substrate on which the gate insulating film 32a and the oxide semiconductor layer 33a are formed in the gate insulating film forming step by a sputtering method (see FIG. 9 (c)) is formed with a thickness of about 3000 mm.
- a photosensitive resin film (not shown) is applied to the entire substrate on which the second metal conductive film 34 has been formed by spin coating
- the photosensitive resin film is applied to a third photomask (not shown).
- a third resist pattern (not shown) is formed by patterning using the shown.
- a source electrode 34a and a drain electrode 34b are obtained. And the source line 34c is formed.
- a second inorganic insulating film such as a silicon nitride film or a silicon oxide film is formed on the entire substrate on which the source electrode 34a, the drain electrode 34b, and the source line 34c are formed in the source layer formation step by a sputtering method or a plasma CVD method.
- 35 (see FIG. 9D) is formed with a thickness of about 3000 mm.
- the photosensitive resin film is used for the 4th photomask (not shown).
- an interlayer insulating film 35a is formed as shown in FIGS. 9D and 10E. .
- ⁇ Pixel electrode formation process> The oxide semiconductor layer 33a (see FIG. 9D) exposed from the interlayer insulating film 35a formed in the interlayer insulating film forming step is treated with reducing plasma P as shown in FIG. 9E. Thus, the resistance of the oxide semiconductor layer 33a exposed from the interlayer insulating film 35a is reduced to form the pixel electrode 33ab, and the semiconductor layer 33aa is formed below the interlayer insulating film 35a.
- the TFT substrate 50c of this embodiment can be manufactured.
- the first metal conductive film is formed on the glass substrate 30, and then the first photomask is used.
- the first metal conductive film exposed from the first resist pattern formed in this way is patterned to form a gate line, a gate electrode 31a, and a first connection wiring (first wiring) 31b.
- the first inorganic insulating film 32 and the oxide semiconductor film 33 are sequentially formed over the gate line, the gate electrode 31a, and the first connection wiring 31b, and then the second photomask.
- the stacked film of the first inorganic insulating film 32 and the oxide semiconductor film 33 exposed from the second resist pattern formed by using the patterning is patterned to form a contact hole 33b for forming a wiring connection structure at the substrate end.
- a gate insulating film 32a is formed.
- the second metal conductive film 34 is formed over the oxide semiconductor layer 33a, the second metal exposed from the third resist pattern formed using the third photomask.
- the conductive film 34 is patterned to form a source electrode 34a, a drain electrode 34b, and a source line (second wiring) 34c.
- the first connection wiring 31b and the source line 34c are connected to each other through a contact hole 33b formed in the gate insulating film 32a (a stacked film of the first inorganic insulating film 32 and the oxide semiconductor film 33). Therefore, the wiring connection structure can be specifically configured at the end portion of the substrate. Further, in the interlayer insulating film forming step, the fourth resist pattern formed using the fourth photomask after forming the second inorganic insulating film 35 on the source electrode 34a, the drain electrode 34b, and the source line 34c. The second inorganic insulating film 35 exposed from the substrate is patterned to form an interlayer insulating film 35a.
- the TFT substrate 50c can be manufactured using the first, second, third and fourth photomasks, so that the TFT substrate having the wiring connection structure at the end of the substrate is made possible. Can be manufactured at low cost. Further, in the manufactured TFT substrate 50c, the portion (semiconductor layer 33aa) constituting the TFT 5c of the oxide semiconductor film is covered with the interlayer insulating film 35a, and accordingly, it is supplied for lowering the resistance. Since it is hard to receive damage from the plasma P etc. which are performed, the characteristic of TFT5c can be made favorable. Therefore, a TFT substrate having an excellent characteristic using an oxide semiconductor and a TFT substrate provided with a wiring connection structure at an end portion of the substrate can be manufactured at as low a cost as possible.
- the manufacturing method of the TFT substrate 50c of the present embodiment it is not necessary to prepare a photomask for halftone exposure as in the second embodiment, so that it is easier than the manufacturing method of the second embodiment.
- a TFT substrate can be manufactured at low cost.
- FIG. 11 is a cross-sectional view of the display area for explaining the manufacturing process of the TFT substrate 50d of this embodiment
- FIG. 12 is a cross-sectional view of the non-display area for explaining the manufacturing process of the TFT substrate 50d. .
- the TFT substrate 50 d is orthogonal to the glass substrate 40, a plurality of gate lines (not shown) provided on the glass substrate 40 so as to extend in parallel with each other, and the gate lines.
- a plurality of source lines (not shown) provided so as to extend in parallel to each other, a plurality of TFTs 5d provided for each gate line and each intersection of the source lines, that is, for each pixel, and each TFT 5d
- a plurality of pixel electrodes 44b respectively provided in a plurality of openings formed in a matrix in the interlayer insulating film 45a and connected to the respective TFTs 5d.
- the first connection wiring 41b extending along the gate line and the second connection wiring 43d extending along the source line form a wiring connection structure at the substrate end. Therefore, they are connected to each other via a conductive portion 44c inside a contact hole 43c formed in the gate insulating film 42a (a laminated film of the first inorganic insulating film 42 and the second metal conductive film 43) (FIG. 12). (Refer to (f)).
- the TFT 5d includes a gate electrode 41a provided on the glass substrate 40, a gate insulating film 42a provided to cover the gate electrode 41a, and a gate electrode on the gate insulating film 42a.
- the source electrode 43a and the drain electrode 43b provided so as to overlap with and be separated from each other, and the semiconductor layer 44a provided on the gate insulating film 42a so as to overlap the gate electrode 41a via the source electrode 43a and the drain electrode 43b.
- the gate electrode 41a is a portion protruding to the side of the gate line
- the source electrode 43a is a portion protruding to the side of the source line, and is connected to the source region of the semiconductor layer 44a.
- the drain electrode 43b is connected to the drain region of the semiconductor layer 44a and the pixel electrode 44b.
- the semiconductor layer 44a and the pixel electrode 44b are formed of a transparent oxide semiconductor film such as IGZO, ISiZO, or IAlZO, for example.
- the pixel electrode 44b is a portion exposed from the interlayer insulating film 45a of the oxide semiconductor film 44, and has an electric resistance lower than that of the semiconductor layer 44a. It is comprised so that it may become.
- the TFT substrate 50d having the above configuration constitutes a liquid crystal display panel together with, for example, a CF substrate disposed opposite to the TFT substrate and a liquid crystal layer sealed between the two substrates.
- the manufacturing method of this embodiment includes a gate layer forming step, a gate insulating film forming step, a source layer forming step, an interlayer insulating film forming step, and a pixel electrode forming step.
- a first metal conductive film such as an aluminum film, a copper film, or a titanium film is formed on the entire glass substrate 40 having a thickness of 0.7 mm by a sputtering method to a thickness of about 3000 mm. To do.
- a first resist pattern (not shown) is formed by patterning using the shown.
- the first metal conductive film exposed from the first resist pattern is removed by wet etching, and then the first resist pattern is peeled off, so that it is shown in FIGS. 11A and 12A. In this manner, the gate line, the gate electrode 41a, and the first connection wiring 41b are formed.
- a first inorganic insulating film 42 (such as a silicon nitride film or a silicon oxide film) is formed on the entire substrate on which the gate line, the gate electrode 41a, and the first connection wiring 41b are formed by the plasma CVD method. 11B and 12B) are formed with a thickness of about 4000 mm.
- the first film such as an aluminum film, a copper film, or a titanium film is formed by sputtering.
- the second metal conductive film 43 is formed with a thickness of about 3000 mm.
- the photosensitive resin film R (see FIG. 11B and FIG. 12B) is applied to the entire substrate on which the second metal insulating film 43 is formed by spin coating, and then the photosensitivity thereof is applied.
- a second resist pattern Ra (see FIGS. 11B and 12B) having a recess D is formed.
- the gate insulating film 42a having the contact hole 43c (FIG. 12). (See (c)).
- ⁇ Source layer forming step> First, by thinning the second resist pattern Ra used in the gate insulating film forming step by ashing, the second modified resist pattern Rb (FIG. 2B) from which the bottom B of the concave portion D of the second resist pattern Ra has been removed. 11 (b) and FIG. 12 (b)).
- an oxide semiconductor film such as an IGZO-based, ISiZO-based, or IAlZO-based film is formed on the entire substrate on which the source electrode 43a, the drain electrode 43b, the source line, and the second connection wiring 43d are formed in the source layer forming step by a sputtering method.
- 44 is formed with a thickness of about 1000 mm (see FIGS. 11D and 12D).
- a silicon nitride film, a silicon oxide film, or the like is formed on the entire substrate on which the oxide semiconductor film 44 is formed by sputtering or plasma CVD.
- the second inorganic insulating film 45 is formed with a thickness of about 3000 mm.
- a photosensitive resin film (not shown) is applied to the entire substrate on which the second inorganic insulating film 45 is formed by spin coating, the photosensitive resin film is applied to a third photomask (not shown). ) To form a third resist pattern (not shown).
- an interlayer insulating film 45a is formed as shown in FIGS. 11 (e) and 12 (e). .
- FIGS. 11 (e) and 12 (e) The oxide semiconductor film 44 (see FIGS. 11 (e) and 12 (e)) exposed from the interlayer insulating film 45a formed in the interlayer insulating film forming step is shown in FIGS. 11 (f) and 12 (f). As shown in the figure, by processing with the reducing plasma P, the resistance of the oxide semiconductor film 44 exposed from the interlayer insulating film 45a is reduced to form the pixel electrode 44b and the conductive layer 44c, and the lower layer of the interlayer insulating film 45a. A semiconductor layer 44a is formed.
- the TFT substrate 50d of this embodiment can be manufactured.
- the first metal conductive film is formed on the glass substrate 40, and then the first photomask is used.
- the first metal conductive film exposed from the first resist pattern formed in this way is patterned to form a gate line, a gate electrode 41a, and a first connection wiring (first wiring) 41b.
- the gate insulating film forming step first, the first inorganic insulating film 42, the second metal conductive film 43, and the photosensitive resin film R are sequentially formed on the gate line, the gate electrode 41a, and the first connection wiring 41b.
- the photosensitive resin film R is exposed with halftone using a second photomask to form a second resist pattern Ra having a recess.
- the laminated film of the first inorganic insulating film 42 and the second metal conductive film 43 exposed from the second resist pattern Ra is etched to form a gate insulating film 42a having a contact hole 43c.
- the source layer forming step by etching the second metal conductive film 43 exposed by removing the bottom B of the recess D of the second resist pattern Ra by thinning the second resist pattern Ra.
- the source electrode 43a, the drain electrode 43b, the source line, and the second connection wiring (second wiring) 43d are formed.
- the third insulating film 45 is formed.
- the second inorganic insulating film 45 exposed from the third resist pattern formed using the photomask is patterned to form an interlayer insulating film 45a.
- the resistance of the oxide semiconductor film 44 exposed from the interlayer insulating film 45a is reduced to form the pixel electrode 44b, and the first connection wiring 41b and the second connection wiring 43d are made conductive.
- the first connection wiring 41b and the second connection wiring 43d are formed inside the contact hole 43c formed in the gate insulating film 42a (laminated film of the first inorganic insulating film 42 and the second metal conductive film 43). Since the oxide semiconductor films 44 are connected to each other through the conductive portions 44c whose resistance is reduced, the wiring connection structure can be specifically configured at the substrate end. As a result, the TFT substrate 50d can be manufactured using the first, second, and third photomasks, so that the TFT substrate having the wiring connection structure at the substrate end can be reduced as much as possible. Can be manufactured at cost.
- the portion (semiconductor layer 44a) constituting the TFT 5d of the oxide semiconductor film is covered with the interlayer insulating film 45a, so that it is supplied for lowering the resistance. Since it is difficult to receive damage from the plasma P or the like, the characteristics of the TFT 5d can be improved. Therefore, a TFT substrate having an excellent characteristic using an oxide semiconductor and a TFT substrate provided with a wiring connection structure at an end portion of the substrate can be manufactured at as low a cost as possible.
- Embodiments 2 to 4 described above the method of forming a pixel electrode by performing plasma treatment on the oxide semiconductor film to reduce the resistance of a part of the oxide semiconductor film is described. As shown in FIG. 2, by implanting impurities such as hydrogen ions into the oxide semiconductor film or thinning the oxide semiconductor film by wet etching, the resistance of a part of the oxide semiconductor film is reduced, and the pixel An electrode may be formed.
- the TFT substrate having the TFT electrode connected to the pixel electrode as the drain electrode has been exemplified.
- the TFT electrode connected to the pixel electrode is referred to as a source electrode. Can also be applied.
- the present invention is useful for a display panel such as an active matrix liquid crystal display panel or an organic EL display panel.
Abstract
Description
図1~図6は、本発明に係る薄膜トランジスタ基板の製造方法の実施形態1を示している。具体的に、図1は、本実施形態1のTFT基板50aaの平面図である。また、図2(a)~図2(f)は、TFT基板50aaの製造工程を説明するための表示領域の断面図である。さらに、図3(a)~図3(d)は、TFT基板50aaの製造工程を説明するための非表示領域の断面図である。なお、図2(f)は、図1中のII-II線に沿ったTFT基板50aaの断面図でもある。また、図4は、TFT基板50aaを構成するTFT5の特性を示すグラフである。
まず、例えば、厚さ0.7mmのガラス基板10の基板全体に、スパッタリング法により、アルミニウム膜、銅膜、チタン膜などの第1の金属導電膜(不図示)を厚さ3000Å程度で成膜する。
まず、上記ゲート層形成工程でゲート電極11a及びゲート線11が形成された基板全体に、プラズマCVD(Chemical Vapor Deposition)法により、窒化シリコン膜や酸化シリコン膜などの第1の無機絶縁膜12(図3(b)参照)を厚さ4000Å程度で成膜する。
まず、上記ゲート絶縁膜形成工程でゲート絶縁膜12aが形成された基板全体に、スパッタリング法により、アルミニウム膜、銅膜、チタン膜などの第2の金属導電膜13(図2(c)参照)を厚さ3000Å程度で成膜する。
まず、上記ソース層形成工程でソース電極13a、ドレイン電極13b、ソース線13c及び第2接続配線13dが形成された基板全体に、スパッタリング法により、IGZO系、ISiZO系、IAlZO系などの酸化物半導体膜14を厚さ1000Å程度で成膜する(図2(d)及び図3(d)参照)。
上記層間絶縁膜形成工程で形成された層間絶縁膜15aから露出する酸化物半導体膜14(図2(e)参照)を、図2(f)に示すように、水素、アルゴン、酸素などの還元性プラズマPで処理することにより、層間絶縁膜15aから露出する酸化物半導体膜14を低抵抗化して、画素電極14bを形成すると共に、層間絶縁膜15aの下層に半導体層14aを形成する。
図7は、本実施形態のTFT基板50bの製造工程を説明するための表示領域の断面図であり、図8は、TFT基板50bの製造工程を説明するための非表示領域の断面図である。なお、以下の各実施形態において、図1~図6と同じ部分については同じ符号を付して、その詳細な説明を省略する。
まず、例えば、厚さ0.7mmのガラス基板20の基板全体に、スパッタリング法により、アルミニウム膜、銅膜、チタン膜などの第1の金属導電膜(不図示)を厚さ3000Å程度で成膜する。
まず、上記ゲート層形成工程でゲート線、ゲート電極21a及び第1接続配線21bが形成された基板全体に、プラズマCVD法により、窒化シリコン膜や酸化シリコン膜などの第1の無機絶縁膜22を厚さ4000Å程度で成膜する(図7(b)及び図8(b)参照)。
まず、上記ゲート絶縁膜形成工程でゲート絶縁膜22a及び酸化物半導体層23aが形成された基板全体に、スパッタリング法により、アルミニウム膜、銅膜、チタン膜などの第2の金属導電膜24(図7(d)参照)を厚さ3000Å程度で成膜する。
まず、上記ソース層形成工程でソース電極24a、ドレイン電極24b及びソース線24cが形成された基板全体に、スパッタリング法又はプラズマCVD法により、窒化シリコン膜や酸化シリコン膜などの第2の無機絶縁膜25(図7(e)参照)を厚さ3000Å程度で成膜する。
上記層間絶縁膜形成工程で形成された層間絶縁膜25aから露出する酸化物半導体層23a(図7(e)参照)を、図7(f)に示すように、還元性プラズマPで処理することにより、層間絶縁膜25aから露出する酸化物半導体層23aを低抵抗化して、画素電極23abを形成すると共に、層間絶縁膜25aの下層に半導体層23aaを形成する。
図9は、本実施形態のTFT基板50cの製造工程を説明するための表示領域の断面図であり、図10は、TFT基板50cの製造工程を説明するための非表示領域の断面図である。
まず、例えば、厚さ0.7mmのガラス基板30の基板全体に、スパッタリング法により、アルミニウム膜、銅膜、チタン膜などの第1の金属導電膜(不図示)を厚さ3000Å程度で成膜する。
まず、上記ゲート層形成工程でゲート線、ゲート電極31a及び第1接続配線31bが形成された基板全体に、プラズマCVD法により、窒化シリコン膜や酸化シリコン膜などの第1の無機絶縁膜32を厚さ4000Å程度で成膜する(図9(b)及び図10(b)参照)。
まず、上記ゲート絶縁膜形成工程でゲート絶縁膜32a及び酸化物半導体層33aが形成された基板全体に、スパッタリング法により、アルミニウム膜、銅膜、チタン膜などの第2の金属導電膜34(図9(c)参照)を厚さ3000Å程度で成膜する。
まず、上記ソース層形成工程でソース電極34a、ドレイン電極34b及びソース線34cが形成された基板全体に、スパッタリング法又はプラズマCVD法により、窒化シリコン膜や酸化シリコン膜などの第2の無機絶縁膜35(図9(d)参照)を厚さ3000Å程度で成膜する。
上記層間絶縁膜形成工程で形成された層間絶縁膜35aから露出する酸化物半導体層33a(図9(d)参照)を、図9(e)に示すように、還元性プラズマPで処理することにより、層間絶縁膜35aから露出する酸化物半導体層33aを低抵抗化して、画素電極33abを形成すると共に、層間絶縁膜35aの下層に半導体層33aaを形成する。
図11は、本実施形態のTFT基板50dの製造工程を説明するための表示領域の断面図であり、図12は、TFT基板50dの製造工程を説明するための非表示領域の断面図である。
まず、例えば、厚さ0.7mmのガラス基板40の基板全体に、スパッタリング法により、アルミニウム膜、銅膜、チタン膜などの第1の金属導電膜(不図示)を厚さ3000Å程度で成膜する。
まず、上記ゲート層形成工程でゲート線、ゲート電極41a及び第1接続配線41bが形成された基板全体に、プラズマCVD法により、窒化シリコン膜や酸化シリコン膜などの第1の無機絶縁膜42(図11(b)及び図12(b)参照)を厚さ4000Å程度で成膜する。
まず、ゲート絶縁膜形成工程で用いた第2のレジストパターンRaをアッシングで薄肉化することにより、第2のレジストパターンRaの凹部Dの底部Bが除去された第2の変成レジストパターンRb(図11(b)及び図12(b)参照)を形成する。
まず、上記ソース層形成工程でソース電極43a、ドレイン電極43b、ソース線及び第2接続配線43dが形成された基板全体に、スパッタリング法により、IGZO系、ISiZO系、IAlZO系などの酸化物半導体膜44を厚さ1000Å程度で成膜する(図11(d)及び図12(d)参照)。
上記層間絶縁膜形成工程で形成された層間絶縁膜45aから露出する酸化物半導体膜44(図11(e)及び図12(e)参照)を、図11(f)及び図12(f)に示すように、還元性プラズマPで処理することにより、層間絶縁膜45aから露出する酸化物半導体膜44を低抵抗化して、画素電極44b及び導電層44cを形成すると共に、層間絶縁膜45aの下層に半導体層44aを形成する。
D 凹部
H 不純物
P プラズマ
R 感光性樹脂膜
Ra 第2のレジストパターン
10,20,30,40 ガラス基板
11a,21a,31a,41a ゲート電極
11 ゲート線(第1の配線)
12,22,32,42 第1の無機絶縁膜
12a,22a,32a,42a ゲート絶縁膜
12b,23b,33b,43c コンタクトホール
13,24,34,43 第2の金属導電膜
13a,24a,34a,43a ソース電極
13b,24b,34b,43b ドレイン電極
13c,24c,34c ソース線(第2の配線)
13d,43d 第2接続配線(第2の配線)
14,23,33,44 酸化物半導体膜
14b,23ab,33ab,44b 画素電極
15,25,35,45 第2の無機1絶縁膜
15a,25a,35a,45a 層間絶縁膜
21b,31b,41b 第1接続配線(第1の配線)
24c,34c ソース線(第2の配線)
50aa,50ab,50ac,50b,50c,50d TFT基板
Claims (10)
- 基板にゲート電極及び第1の配線を形成するゲート層形成工程と、
上記ゲート電極及び第1の配線を覆うように第1の絶縁膜を成膜した後に、該第1の絶縁膜を上記第1の配線に重なる位置にコンタクトホールが形成されるようにパターニングして、ゲート絶縁膜を形成するゲート絶縁膜形成工程と、
上記ゲート絶縁膜を覆うように導電膜を成膜した後に、該導電膜をパターニングして、上記ゲート電極に重なると共に互いに離間するようにそれぞれ設けられたソース電極及びドレイン電極と、上記第1の配線に交差するように設けられ、上記コンタクトホールを介して上記第1の配線に接続された第2の配線とを形成するソース層形成工程と、
上記ソース電極、ドレイン電極及び第2の配線を覆うように、酸化物半導体膜及び第2の絶縁膜を順に成膜した後に、該第2の絶縁膜をパターニングして、層間絶縁膜を形成する層間絶縁膜形成工程と、
上記層間絶縁膜から露出する酸化物半導体膜を低抵抗化して、画素電極を形成する画素電極形成工程とを備えることを特徴とする薄膜トランジスタ基板の製造方法。 - 基板にゲート電極及び第1の配線を形成するゲート層形成工程と、
上記ゲート電極及び第1の配線を覆うように第1の絶縁膜及び酸化物半導体膜を順に成膜した後に、上記第1の絶縁膜及び酸化物半導体膜の積層膜を上記第1の配線に重なる位置にコンタクトホールが形成されるようにパターニングして、ゲート絶縁膜を形成するゲート絶縁膜形成工程と、
上記酸化物半導体膜を覆うように導電膜を成膜した後に、該導電膜をパターニングして、上記ゲート電極に重なると共に互いに離間するようにそれぞれ設けられたソース電極及びドレイン電極と、上記第1の配線に交差するように設けられ、上記コンタクトホールを介して上記第1の配線に接続された第2の配線とを形成するソース層形成工程と、
上記ソース電極、ドレイン電極及び第2の配線を覆うように、第2の絶縁膜を成膜した後に、該第2の絶縁膜をパターニングして、層間絶縁膜を形成する層間絶縁膜形成工程と、
上記層間絶縁膜から露出する酸化物半導体膜を低抵抗化して、画素電極を形成する画素電極形成工程とを備えることを特徴とする薄膜トランジスタ基板の製造方法。 - 請求項2に記載された薄膜トランジスタ基板の製造方法において、
上記ゲート層形成工程では、上記ソース層形成工程で形成されるドレイン電極と上記画素電極形成工程で形成される画素電極との境界に達するように、上記ゲート電極を幅広に形成することを特徴とする薄膜トランジスタ基板の製造方法。 - 基板にゲート電極及び第1の配線を形成するゲート層形成工程と、
上記ゲート電極及び第1の配線を覆うように第1の絶縁膜及び導電膜を順に成膜した後に、該第1の絶縁膜及び導電膜の積層膜を上記第1の配線に重なる位置にコンタクトホールが形成されるようにパターニングして、ゲート絶縁膜を形成するゲート絶縁膜形成工程と、
上記導電膜をパターニングして、上記ゲート電極に重なると共に互いに離間するようにそれぞれ設けられたソース電極及びドレイン電極と、上記第1の配線に上記コンタクトホールの位置で交差するように設けられた第2の配線とを形成するソース層形成工程と、
上記ソース電極、ドレイン電極及び第2の配線を覆うように、酸化物半導体膜及び第2の絶縁膜を順に成膜した後に、該第2の絶縁膜をパターニングして、層間絶縁膜を形成する層間絶縁膜形成工程と、
上記層間絶縁膜から露出する酸化物半導体膜を低抵抗化して、画素電極を形成すると共に、上記第1の配線及び第2の配線を導通させる画素電極形成工程とを備えることを特徴とする薄膜トランジスタ基板の製造方法。 - 請求項4に記載された薄膜トランジスタ基板の製造方法において、
上記ゲート絶縁膜形成工程は、上記導電膜上に感光性樹脂膜を成膜して、該感光性樹脂膜をハーフトーンで露光することにより、凹部が設けられたレジストパターンを形成する工程と、該レジストパターンから露出する上記第1の絶縁膜及び導電膜の積層膜をエッチングして、上記コンタクトホールを形成する工程とを備え、
上記ソース層形成工程では、上記レジストパターンを薄肉化することにより、該レジストパターンの凹部の底部を除去して露出させた上記導電膜をエッチングしてパターニングすることを特徴とする薄膜トランジスタ基板の製造方法。 - 請求項1乃至5の何れか1つに記載された薄膜トランジスタ基板の製造方法において、
上記画素電極形成工程では、上記層間絶縁膜から露出する酸化物半導体膜をプラズマ処理することを特徴とする薄膜トランジスタ基板の製造方法。 - 請求項1乃至5の何れか1つに記載された薄膜トランジスタ基板の製造方法において、
上記画素電極形成工程では、上記層間絶縁膜から露出する酸化物半導体膜に不純物を注入することを特徴とする薄膜トランジスタ基板の製造方法。 - 請求項1乃至5の何れか1つに記載された薄膜トランジスタ基板の製造方法において、
上記画素電極形成工程では、上記層間絶縁膜から露出する酸化物半導体膜をエッチングにより薄くすることを特徴とする薄膜トランジスタ基板の製造方法。 - 請求項1乃至8の何れか1つに記載された薄膜トランジスタ基板の製造方法において、
上記第2の配線は、上記ソース電極に導通するソース線であり、
上記第1の配線は、上記ソース線に接続するための第1接続配線であることを特徴とする薄膜トランジスタ基板の製造方法。 - 請求項1乃至8の何れか1つに記載された薄膜トランジスタ基板の製造方法において、
上記第1の配線は、上記ゲート電極に導通するゲート線であり、
上記第2の配線は、上記ゲート線に接続するための第2接続配線であることを特徴とする薄膜トランジスタ基板の製造方法。
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EP2458577B1 (en) | 2017-03-01 |
JP5074625B2 (ja) | 2012-11-14 |
JPWO2011010415A1 (ja) | 2012-12-27 |
US8481373B2 (en) | 2013-07-09 |
CN102473362A (zh) | 2012-05-23 |
CN102473362B (zh) | 2013-06-05 |
EP2458577A1 (en) | 2012-05-30 |
BR112012001655A2 (pt) | 2017-06-13 |
RU2491678C1 (ru) | 2013-08-27 |
EP2458577A4 (en) | 2015-07-01 |
US20120108018A1 (en) | 2012-05-03 |
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