WO2014192221A1 - 薄膜トランジスタ装置とその製造方法、および表示装置 - Google Patents
薄膜トランジスタ装置とその製造方法、および表示装置 Download PDFInfo
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- WO2014192221A1 WO2014192221A1 PCT/JP2014/002299 JP2014002299W WO2014192221A1 WO 2014192221 A1 WO2014192221 A1 WO 2014192221A1 JP 2014002299 W JP2014002299 W JP 2014002299W WO 2014192221 A1 WO2014192221 A1 WO 2014192221A1
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- thin film
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Images
Classifications
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- 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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- 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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- 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
- H01L29/417—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions carrying the current to be rectified, amplified or switched
- H01L29/41725—Source or drain electrodes for field effect devices
- H01L29/41733—Source or drain electrodes for field effect devices for thin film transistors with insulated gate
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- 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
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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
- H01L29/66007—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
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66969—Multistep manufacturing processes of devices having semiconductor bodies not comprising group 14 or group 13/15 materials
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- H—ELECTRICITY
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- 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
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
- H10K59/1213—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements the pixel elements being TFTs
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/87—Passivation; Containers; Encapsulations
- H10K59/873—Encapsulations
-
- 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
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/844—Encapsulations
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/123—Connection of the pixel electrodes to the thin film transistors [TFT]
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/124—Insulating layers formed between TFT elements and OLED elements
Definitions
- the present invention relates to a thin film transistor device, a manufacturing method thereof, and a display device.
- the active matrix display device includes a TFT device in which a plurality of thin film transistor (TFT) elements for driving light emission in each subpixel unit are formed.
- TFT thin film transistor
- a TFT device including a channel layer made of an oxide semiconductor has been developed for use in a display device or the like (Patent Document 1).
- Patent Document 1 A conventional TFT device having such a channel layer made of an oxide semiconductor will be described with reference to FIG.
- the TFT device includes a gate electrode 901, a gate insulating film 903, a channel layer 904, a channel protective film 906, a source electrode 907 and a drain electrode 908, and a passivation film 916 on a substrate 900.
- the gate insulating film 903 has a two-layer structure of a silicon-based insulating layer 9031 and an aluminum oxide layer 9032.
- the channel protective film 906 and the passivation film 916 also have a two-layer structure of aluminum oxide layers 9061 and 9161 and silicon-based insulating layers 9062 and 9162.
- the source electrode 907 and the drain electrode 908 have a three-layer structure of Mo layers 9071 and 9081, Al layers 9072 and 9082, and Ti layers 9073 and 9083.
- the gate insulating film 903, the channel protective film 906, and the passivation film 916 disposed above and below the channel layer 904 include the aluminum oxide layers 9032, 9061, and 9161. Permeation of hydrogen to the channel layer 904 is suppressed, and reduction of oxygen in the channel layer 904 by moisture and hydrogen in the atmosphere is suppressed. In addition, desorption of oxygen or the like from the channel layer 904 is suppressed.
- a contact hole is formed in the passivation film 916 with respect to the source electrode 907 and the drain electrode 908 of the TFT device, and wiring is connected through the contact hole.
- the aluminum oxide layer 9161 included in the configuration of the passivation film 916 has low workability, and greatly depends on the film quality and film thickness when forming contact holes. For this reason, in the conventional technique in which the aluminum oxide layer 9161 of the passivation film 916 is formed directly on the source electrode 907 and the drain electrode 908, the lower source electrode 907 and the drain electrode 907 are formed at the time of drilling the aluminum oxide layer 9161. It is conceivable that the electrode 908 is damaged. Therefore, it is conceivable that the yield of the TFT device is lowered and the productivity is lowered.
- the passivation film includes a layer such as aluminum nitride or aluminum oxynitride.
- the present invention has been made to solve the above problems, and is a thin film transistor device that can be produced at a high yield while suppressing deterioration of a channel layer made of an oxide semiconductor, a manufacturing method thereof, and a display device The purpose is to provide.
- a thin film transistor device (hereinafter referred to as a “TFT device”) according to one embodiment of the present invention includes (i) a substrate, (ii) a gate electrode, (iii) a source electrode and a drain electrode, and (iv) a channel. A layer, and (v) a passivation layer.
- the gate electrode is formed above the substrate.
- the source electrode and the drain electrode are provided above the substrate, spaced from the gate electrode, and spaced from each other.
- the channel layer is inserted between the gate electrode, the source electrode, and the drain electrode.
- the passivation layer is provided so as to cover the gate electrode, the source electrode, the drain electrode, and the channel layer, and a hole is formed in a part thereof in the thickness direction.
- the channel layer is made of an oxide semiconductor material.
- the passivation layer has a stacked structure including the first layer, the second layer, and the third layer from the substrate side.
- the first layer of the passivation layer is made of any one of silicon oxide, silicon nitride, and silicon oxynitride
- the second layer of the passivation layer is made of an aluminum compound
- the third layer of the passivation layer is made of silicon oxide, It consists of either silicon nitride or silicon oxynitride.
- the TFT device has a configuration capable of producing at a high yield while suppressing deterioration of the channel layer made of an oxide semiconductor.
- FIG. 3 is a schematic circuit diagram illustrating a circuit configuration in each sub-pixel 10a of the display panel 10.
- FIG. 3 is a schematic cross-sectional view showing a configuration of each sub-pixel 10a of the display panel 10.
- FIGS. 4A to 4D are schematic cross-sectional views showing states in respective steps in manufacturing the display panel 10.
- FIGS. 4A to 4D are schematic cross-sectional views showing states in respective steps in manufacturing the display panel 10.
- (A)-(c) is a schematic cross section which shows the state in each process in manufacture of the display panel 10.
- FIGS. It is a schematic cross section which shows the partial structure of the display panel 30 which concerns on Embodiment 2 of this invention. It is a schematic cross section which shows the partial structure of the display panel 50 which concerns on Embodiment 3 of this invention.
- FIG. 6 is a schematic cross-sectional view showing a part of a display panel 70 according to Embodiment 4 of the present invention. It is a schematic cross section which shows a partial structure of the display panel 80 which concerns on Embodiment 5 of this invention.
- FIG. 2 is a schematic cross-sectional view showing a passivation layer and an upper electrode, where (a) is a comparative example in which the layer thickness of the lower insulating layer is 50 [nm], and (b) is a layer thickness of the lower insulating layer of 100 [nm]. And (c) shows an example in which the thickness of the lower insulating layer is 200 [nm].
- (A) is a schematic cross-sectional view for explaining a mechanism leading to generation of voids in the upper electrode when the lower insulating layer is thin, and (b) is a case where the lower insulating layer is hot It is a schematic cross section for demonstrating the mechanism in which generation
- FIG. 6 is a graph showing the relationship between the layer thicknesses of the SiO layer and the SiN layer in the upper insulating layer and the breakdown voltage between the SD electrode and the upper electrode, wherein (a) shows the SiN layer with the SiO layer thickness of 260 [nm]. When omitted, (b) shows that when the SiO layer has a thickness of 100 [nm] and the SiN layer has a thickness of 100 [nm], (c) shows that the SiO layer has a thickness of 200 [nm] and SiN When the layer thickness is 100 [nm], (d) represents the case where the SiO layer thickness is 100 [nm] and the SiN layer thickness is 200 [nm].
- FIG. 4 is a schematic cross-sectional view showing a passivation layer 816 in the display panel 80 and a partial configuration around it.
- FIG. FIG. 6 is a micrograph showing the film formation temperature of the upper insulating layer and the adhesion between the barrier layer and the upper insulating layer, where (a) shows a film formation temperature of 230 [° C.] and (b) shows a film formation temperature of The case of 290 [° C.] is shown. It is a schematic plan view which shows the state which SD electrode produced when the film-forming temperature of an upper insulating layer is too high deform
- FIG. 1 It is a schematic cross section for demonstrating the diffusion mechanism of hydrogen to a channel layer, (a) is a diffusion mechanism in an ITO crystallization process, (b) is a diffusion mechanism in the baking process of an interlayer insulation layer.
- (A) is a schematic plan view which shows the glass substrate used in order to measure the relationship between the film-forming conditions and film quality of a SiN film, and a measurement location, (b) is the film-forming conditions and film quality of a SiN film It is the measurement data which shows.
- (A) is a characteristic diagram showing the relationship between the film thickness of the SiN film in each of samples 1 to 3 and transistor characteristics, and (b) is the film thickness of the SiN film in each of samples 1 to 3. It is a characteristic view which shows the relationship with the board
- a thin film transistor device (hereinafter referred to as a “TFT device”) according to one embodiment of the present invention includes (i) a substrate, (ii) a gate electrode, (iii) a source electrode and a drain electrode, and (iv) a channel. A layer, and (v) a passivation layer.
- the gate electrode is formed above the substrate.
- the source electrode and the drain electrode are provided above the substrate, spaced from the gate electrode, and spaced from each other.
- the channel layer is inserted between the gate electrode and the source and drain electrodes.
- the passivation layer is provided so as to cover the gate electrode, the source electrode, the drain electrode, and the channel layer, and a part of the hole is formed in the layer thickness direction.
- the channel layer is made of an oxide semiconductor material.
- the passivation layer has a stacked structure including the first layer, the second layer, and the third layer from the substrate side.
- the first layer of the passivation layer is made of any one of silicon oxide, silicon nitride, and silicon oxynitride
- the second layer of the passivation layer is made of an aluminum compound (aluminum oxide, aluminum nitride, aluminum oxynitride)
- the third layer of the passivation layer is made of silicon oxide, silicon nitride, or silicon oxynitride.
- the TFT device by forming the channel layer from an oxide semiconductor, it has high electron mobility and excellent electrical characteristics. For this reason, high electron mobility can be expected without depending on the temperature.
- the passivation layer has a laminated structure including the first layer, the second layer, and the third layer.
- the second layer is a layer made of an aluminum compound, entry of moisture and hydrogen can be suppressed (barrier), and the channel layer can be protected.
- the passivation layer has a laminated structure including at least the three layers, it is difficult to reduce the yield when opening holes (contact holes) in the passivation layer. That is, a dry etching method can be used for opening holes in the first layer and the third layer of the passivation layer, and a wet etching method can be used for opening holes in the second layer. At this time, the etching selection ratio of each of the first to third layers with respect to the underlying layer is large, and the etching of the lower layer can be started in a state where the etching of each layer is completely completed by applying over-etching.
- the first layer of the passivation layer is in contact with any one of the gate electrode, the source electrode, and the drain electrode.
- the fourth layer is further included in the lamination structure of the passivation layer in the above aspect.
- the fourth layer of the passivation layer is made of silicon oxide, silicon nitride, or silicon oxynitride, and is stacked on the third layer.
- a conductive layer is formed along the inner wall in the hole opened in the passivation layer, and a part of the conductive layer is formed by any of the electrodes (via the hole formed in the passivation layer).
- a gate electrode, a source electrode, or a drain electrode may be used to the third layer.
- the third layer and the fourth layer of the passivation layer are both made of silicon nitride, and the density of the silicon nitride of the fourth layer is the silicon nitride of the third layer. Is less than the density.
- the hole contact hole
- the source electrode and the drain electrode contains copper or an alloy material thereof
- the fourth layer of the passivation layer is made of silicon nitride or silicon oxynitride.
- the layer thickness is 200 [nm] or more
- the third layer of the passivation layer is made of silicon oxide
- the layer thickness is 100 [nm] or more.
- the TFT device includes the fourth layer and the fifth layer that are sequentially stacked on the third layer in the passivation layer.
- the fourth layer is made of any one of silicon oxide, silicon nitride, and silicon oxynitride
- the fifth layer is also made of any of silicon oxide, silicon nitride, and silicon oxynitride.
- a conductive layer is formed along the inner wall, and the conductive layer partially passes through the hole (contact hole) opened in the passivation layer.
- the passivation layer includes the fourth layer and the fifth layer, the moisture resistance can be further improved.
- the first layer of the passivation layer is interposed between the gate electrode, the source electrode, or the drain electrode with an interlayer insulating layer interposed therebetween. Is formed.
- a hole communicating with the hole (contact hole) provided in the passivation layer is provided in the interlayer insulating layer, and the hole provided in the interlayer insulating layer is provided.
- a conductive layer is formed along the inner wall, and a part of the conductive layer is electrically connected to one of the above electrodes through a hole formed in the interlayer insulating layer, and a part of the conductive layer is electrically connected. It is inserted between the interlayer insulating layer and the first layer.
- the second layer of the passivation layer is made of aluminum oxide.
- the second layer made of aluminum oxide has an excellent barrier property that prevents moisture and hydrogen from entering and protects the channel layer. Thereby, degradation of the channel layer is suppressed.
- the first layer of the passivation layer is made of silicon oxide.
- the thickness of the passivation layer is 1000 nm or less, more preferably 600 [nm] or less. In this way, by setting the thickness of the passivation layer to 1000 [nm] or less (more preferably 600 [nm] or less), it is possible to suppress a decrease in production efficiency.
- the first layer of the passivation layer is made of silicon oxide,
- the layer thickness is 200 [nm] or more.
- a conductive layer upper part of the TFT device formed along the inner wall where a hole (contact hole) opened in the passivation layer is desired. It is possible to suppress the entry of voids into the electrode (electrode connected to the source electrode or the drain electrode). Therefore, electrical reliability can be maintained high.
- a display device includes the TFT device according to any one of the above aspects. Thereby, in the display device according to the aspect, the above effect can be achieved.
- the display device includes a plurality of light emitting units formed along the surface of the substrate, and each of the plurality of light emitting units is provided between an anode and a cathode, and between the anode and the cathode. And an organic light emitting layer interposed.
- the TFT device can also be applied to an organic EL display device.
- the substrate is not limited to a material using glass or the like, and a flexible substrate using a material such as resin can also be adopted.
- the TFT device manufacturing method manufactures a TFT device through steps (i) to (iv).
- a gate electrode is formed above the substrate.
- a channel layer is formed above the gate electrode.
- a source electrode and a drain electrode are formed with a space between each other.
- a passivation layer is formed which covers the channel layer, the gate electrode, the source electrode, and the drain electrode, and is partially opened with a hole inserted in the layer thickness direction.
- the channel layer is formed using an oxide semiconductor material.
- a first preparation film is formed to cover the channel layer, the gate electrode, the source electrode, and the drain electrode.
- a second preparation film is formed on the first preparation film using an aluminum compound (aluminum oxide, aluminum nitride, aluminum oxynitride).
- a third preparation film is formed on the second preparation film using any material of silicon oxide, silicon nitride, and silicon oxynitride.
- the channel layer is formed from an oxide semiconductor, so that it has high electron mobility and excellent electrical characteristics. Therefore, it is possible to manufacture a TFT device that can be expected to have high electron mobility without depending on the temperature.
- the passivation layer is formed by a laminated structure including the first layer, the second layer, and the third layer according to the above (iv-1) to (iv-6).
- the second preparatory film is formed of a layer made of an aluminum compound, penetration of moisture and hydrogen can be suppressed (barrier) and the channel layer can be protected by the second layer in the passivation layer.
- the dry etching method is employed for opening the holes in the first preparation film and the third preparation film of the passivation layer, and the opening in the second preparation film is performed.
- a wet etching method is employed ((iv-4) to (iv-6)). At this time, the etching selectivity of the first preparation film to the third preparation film with respect to the underlying film is large, and overetching is performed and etching of the lower film is started in a state where the etching of each film is completely completed. can do.
- the dry device or the oxygen atmosphere is used. Annealing treatment is performed.
- the substrate on which the channel layer is formed is placed under vacuum. Therefore, oxygen in the oxide semiconductor in the channel layer is lost and the resistance is reduced.
- the high resistance state can be maintained by performing an annealing process in dry air or an oxygen atmosphere after the first preparation film is formed.
- the second preparation film of the above aspect when the second preparation film of the above aspect is formed, the second preparation film made of aluminum oxide is formed.
- the second preparation film is formed with a film thickness in the range of 10 [nm] to 100 [nm]. If it is less than 10 [nm], the barrier property of moisture and hydrogen may be insufficient. Conversely, if it is thicker than 100 [nm], the processing time becomes long and the production efficiency decreases.
- the passivation layer is formed with a layer thickness of 1000 [nm] or less, more preferably 600 [nm] or less in (iv) of the above aspect.
- a passivation layer having excellent barrier properties can be formed with high production efficiency.
- a source electrode and a drain electrode is formed using copper or an alloy thereof, and a third preparation film for a passivation layer is formed. Later, annealing is performed at a temperature of 300 [° C.] or less. Thereby, the high resistance state of the channel layer is maintained, and deformation of at least one of the source electrode and the drain electrode formed using the Cu-based material can be suppressed.
- a first preparation film made of silicon oxide is formed at a temperature of 230 [° C.] or lower.
- the electrodes and wirings made of the lower Cu-based material at the time of film formation are less likely to cause surface roughness. It is possible to ensure high adhesion and maintain excellent interelectrode contact characteristics.
- the first preparation film is formed with a film thickness of 200 [nm] or more.
- a conductive layer (connected to the source electrode or drain electrode of the TFT device) formed along the inner wall where the hole (contact hole) opened in the passivation layer is desired. It is possible to suppress the entry of a void into the electrode. Therefore, it is excellent from the viewpoint of ensuring electrical reliability.
- the first preparation film is formed with a film thickness of 600 [nm] or less.
- the film thickness of the first preparation film there is a merit that the influence of the fixed charge of the second layer on the channel layer can be reduced.
- it exceeds 600 [nm] there arises a problem of increased time for etching and the like. Therefore, an increase in tact time can be suppressed by setting it to 600 [nm], which is advantageous from the viewpoint of manufacturing cost.
- a fourth preparation film made of silicon oxide is formed (referred to as (iv-7)).
- a third preparation film made of silicon nitride or silicon oxynitride is formed, and
- a fourth preparation film is formed with a film thickness of 100 [nm] or more, and in (iv-3), a third preparation film is formed with a film thickness of 200 [nm] or more.
- film formation is performed at a temperature of 290 ° C. or higher and lower than 300 ° C.
- the adhesion of the passivation layer to the source electrode and the drain electrode can be kept high, and “film floating” such as the passivation layer around the contact hole occurs. hard.
- migration of at least one of the source electrode and the drain electrode made of a Cu-based material can be suppressed, and deformation of these electrodes can be suppressed. Therefore, it is possible to suppress the occurrence of an electrical short circuit between the source electrode and the drain electrode and the electrode or wiring formed on the passivation layer.
- a third preparation film made of silicon nitride satisfying the relationship of SiH / NH ⁇ 0.10 is formed.
- the third preparation film made of silicon nitride is formed so that the absolute value of the stress is 150 [MPa] or less in (iv-3). .
- the display device 1 includes a display panel 10 and a drive control circuit unit 20 connected thereto.
- the display panel 10 is an organic EL (Electro Luminescence) panel using an electroluminescence phenomenon of an organic material, and a plurality of organic EL elements are arranged in a matrix, for example.
- the drive control circuit unit 20 includes four drive circuits 21 to 24 and a control circuit 25.
- each circuit of the drive control circuit unit 20 with respect to the display panel 10 is not limited to the form shown in FIG. 1.
- each subpixel 10a includes two transistor element portions Tr 1 and Tr 2 , one capacitor C, and an EL element portion EL as a light emitting portion. It is configured. Two transistors element Tr 1, one transistor element Tr 1 of the Tr 2 is a driving transistor element part, the other transistor element Tr 2, a switching transistor element part.
- the gate electrode G 2 of the switching transistor element portion Tr 2 is connected to the scanning line Vscn, and the source electrode S 2 is connected to the data line Vdat.
- the drain electrode D 2 of the switching transistor element Tr 2 is connected to the gate electrode G 1 of the driving transistor element Tr 1.
- the drain electrode D 1 of the driving transistor element portion Tr 1 is connected to the power supply line Va, and the source electrode S 1 is connected to the anode of the EL element portion EL.
- the cathode in the EL element portion EL is connected to the ground line Vcat.
- capacitance C, and the gate electrode G 1 of the drain electrode D 2 and the driving transistor element Tr 1 of the switching transistor element Tr 2 is provided so as to connect the power line Va.
- subpixels 10a having a circuit configuration as shown in FIG. 2 are provided in a matrix, for example, and a plurality of adjacent subpixels 10a (for example, red (R) and green (G) are provided. And three sub-pixels 10a) of blue (B) emission color constitute one pixel.
- the display panel 10 is a top emission type organic EL display panel, in which a TFT device is configured below the Z-axis direction, and an EL element unit is configured thereon.
- TFT device As shown in FIG. 3, gate electrodes 101 and 102 are formed on a substrate 100 at intervals, and gate insulation is performed so as to cover the surfaces of the gate electrodes 101 and 102 and the substrate 100. A layer 103 is formed. On the gate insulating layer 103, channel layers 104 and 105 are formed corresponding to the gate electrodes 101 and 102, respectively. A channel protective layer 106 is formed so as to cover the surfaces of the channel layers 104 and 105 and the gate insulating layer 103.
- a source electrode 107 and a drain electrode 108 are formed on the channel protective layer 106 so as to correspond to the gate electrode 101 and the channel layer 104, and are similarly formed corresponding to the gate electrode 102 and the channel layer 105.
- the source electrode 110 and the drain electrode 109 are formed at a distance from each other.
- the source lower electrodes 111 and 115 and the drain lower electrodes 112 and 114 are provided below the source electrodes 107 and 110 and the drain electrodes 108 and 109 through the channel protective layer 106.
- the source lower electrode 111 and the drain lower electrode 112 are in contact with the channel layer 104 at the lower part in the Z-axis direction, and the source lower electrode 114 and the drain lower electrode 115 are in contact with the channel layer 105 at the lower part in the Z-axis direction.
- the drain electrode 108 and the gate electrode 102 are connected by a contact plug 113 provided through the gate insulating layer 103 and the channel protective layer 106.
- the gate electrode 101 corresponds to the gate electrode G 2 in FIG. 2
- the source electrode 107 corresponds to the source electrode S 2 in FIG. 2
- the drain electrode 108 corresponds to the drain electrode D 2 in FIG.
- the gate electrode 102 corresponds to the gate electrode G 1 in FIG. 2
- the source electrode 110 corresponds to the source electrode S 1 in FIG. 2
- the drain electrode 109 corresponds to the drain electrode D 1 in FIG. Therefore, the switching transistor element portion Tr 2 is formed on the left side in the Y-axis direction in FIG. 3, and the drive transistor element portion Tr 1 is formed on the right side in the Y-axis direction.
- the arrangement of the transistor element portions Tr 1 and Tr 2 is not limited to this.
- a passivation layer 116 is formed so as to cover the source electrodes 107 and 110, the drain electrodes 108 and 109, and the channel protective layer 106.
- a contact hole is formed in a part above the source electrode 110, and an upper electrode 117 is provided along the side wall of the contact hole.
- the upper electrode 117 is connected to the source electrode 110 at the lower portion in the Z-axis direction, and a part of the upper electrode 117 rides on the passivation layer 116.
- An interlayer insulating layer 118 is deposited on the passivation layer 116.
- an anode 119 is provided on the interlayer insulating layer 118 in units of subpixels.
- the anode 119 is connected to the upper electrode 117 through a contact hole formed above the upper electrode 117 in the interlayer insulating layer 118.
- a hole injection layer 120 is formed, and a bank 121 is formed so as to cover the edge of the hole injection layer 120.
- An opening corresponding to each sub-pixel 10 a is formed by the surrounding of the bank 121.
- a hole transport layer 122 In the opening defined by the bank 121, a hole transport layer 122, a light emitting layer 123, and an electron transport layer 124 are formed in this order from the lower side in the Z-axis direction.
- the hole transport layer 122 is in contact with the hole injection layer 120 at the lower part in the Z-axis direction.
- the cathode 125 and the sealing layer 126 are sequentially stacked so as to cover the electron transport layer 124 and the bank 121.
- the cathode 125 is formed in a continuous state over the entire display panel 10 and is connected to the bus bar wiring in units of pixels or in units of several pixels (not shown).
- a substrate 130 in which a color filter layer 128 and a light shielding layer 129 are formed on the main surface on the lower side in the Z-axis direction is disposed above the sealing layer 126 in the Z-axis direction, and is bonded by the bonding layer 127.
- Substrate 100, 130 examples of constituent materials of the substrates 100 and 130 include glass substrates, quartz substrates, silicon substrates, molybdenum sulfide, copper, zinc, aluminum, stainless steel, magnesium, iron, nickel, gold, silver, and other metal substrates, gallium arsenide groups, and the like.
- a semiconductor substrate, a plastic substrate, or the like can be used.
- thermoplastic resin such as polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer (EVA), cyclic polyolefin, modified polyolefin, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyamide, polyimide (PI), Polyamideimide, polycarbonate, poly- (4-methylbenten-1), ionomer, acrylic resin, polymethyl methacrylate, acrylic-styrene copolymer (AS resin), butadiene-styrene copolymer, polio copolymer (EVOH) ), Polyesters such as polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene naphthalate (PEN), precyclohexane terephthalate (PCT), polyethers, polyether ketones Polyethers
- Gate electrodes 101 and 102 As the gate electrodes 101 and 102, for example, a stacked body (Cu: 200 [nm] + Mo: 20 [nm]) of copper (Cu) and molybdenum (Mo) is employed. However, the configuration of the gate electrodes 101 and 102 is not limited to this. For example, Cu, Cu / W, or the like can be used, and the following materials can also be used.
- Acids such as hydrochloric acid, sulfuric acid, sulfonic acid, phosphorus hexafluoride, arsenic pentafluoride, iron chloride
- a dopant such as a metal atom such as a halogen atom, sodium, potassium and iodine, or the like
- a polymer mixture containing fine metal particles and conductive particles such as graphite may be used. These may be used alone or in combination of two or more.
- Gate insulating layer 103 As the gate insulating layer 103, for example, a stacked body (SiO: 80 [nm] + SiN: 70 [nm]) of silicon oxide (SiO) and silicon nitride (SiN) is employed. However, the configuration of the gate insulating layer 103 is not limited to this, and as a constituent material of the gate insulating layer, for example, any known organic material or inorganic material may be used as long as it has an electrical insulating property. Can be used.
- an acrylic resin for example, an acrylic resin, a phenol resin, a fluorine resin, an epoxy resin, an imide resin, a novolac resin, or the like can be used.
- inorganic materials include silicon oxide, aluminum oxide, tantalum oxide, zirconium oxide, cerium oxide, zinc oxide, cobalt oxide and other metal oxides, silicon nitride, aluminum nitride, zirconium nitride, cerium nitride, zinc nitride, Examples thereof include metal nitrides such as cobalt nitride, titanium nitride, and tantalum nitride, and metal composite oxides such as barium strontium titanate and lead zirconium titanate. These can be used in combination of 1 species or 2 species or more.
- ODTS OTS ⁇ HMDS ⁇ PTS surface treatment agent
- Channel layers 104 and 105 As the channel layers 104 and 105, layers having a layer thickness of 50 [nm] made of amorphous indium gallium zinc oxide (IGZO) are employed.
- the constituent material of the channel layers 104 and 105 is not limited to this, and an oxide semiconductor containing at least one selected from indium (In), gallium (Ga), and zinc (Zn) can be used. .
- the layer thickness of the channel layers 104 and 105 can be in the range of 20 [nm] to 200 [nm], and the channel layer 104 and the channel layer 105 may be set to have different layer thicknesses. it can.
- V Channel protective layer 106
- a layer made of silicon oxide (SiO) having a layer thickness of 130 [nm] is employed as the channel protective layer 106.
- the constituent material of the channel protective layer 106 is not limited to this.
- silicon oxynitride (SiON), silicon nitride (SiN), or aluminum oxide (AlOx) can be used.
- a plurality of layers using the above materials can be stacked.
- the layer thickness of the channel protective layer 106 can be in the range of 50 [nm] to 500 [nm].
- Source electrodes 107 and 110 Drain electrodes 108 and 109 As the source electrodes 107 and 110 and the drain electrodes 108 and 109, a laminated body of copper manganese (CuMn), copper (Cu), and molybdenum (Mo) (CuMn: 20 [nm] + Cu: 300 [nm] + Mo: 20 [nm] ]).
- CuMn copper manganese
- Cu copper
- Mo molybdenum
- the layer thicknesses of the source electrodes 107 and 110 and the drain electrodes 108 and 109 can be in the range of 100 [nm] to 500 [nm].
- the same material can be used for the source lower electrodes 111 and 115 and the drain lower electrodes 112 and 114. Further, the source electrode 107 and the source lower electrode 111, the drain electrode 108 and the drain lower electrode 112, the drain electrode 109 and the drain lower electrode 114, and the source electrode 110 and the source lower electrode 115 can be integrally formed.
- the display panel 10 has a stacked structure in which a lower insulating layer 1161, a barrier layer 1162, and an upper insulating layer 1163 are sequentially stacked from the lower side in the Z-axis direction.
- the lower insulating layer 1161 is a layer made of silicon oxide (SiO) and having a thickness of 100 [nm].
- the barrier layer 1162 is a layer made of aluminum oxide (AlOx) and having a layer thickness of 25 [nm].
- the upper insulating layer 1163 is a layer made of silicon nitride (SiN) and having a thickness of 360 [nm].
- the barrier layer 1162 is interposed between the lower insulating layer 1161 and the upper insulating layer 1163, and the lower insulating layer 1161 is in contact with the source electrodes 111 and 115 and the drain electrodes 112 and 114. Yes.
- the lower insulating layer 1161 made of silicon oxide is excellent in adhesiveness with the source electrodes 107 and 110 and the drain electrodes 108 and 109 made of the above materials, and has a low hydrogen content in the layer.
- the barrier layer 1162 has a function of suppressing intrusion of moisture and hydrogen and suppressing deterioration of the channel layers 104 and 105 made of an oxide semiconductor (IGZO or the like).
- the layer density of the barrier layer 1162 is desirably 2.80 g / cm 3 or more. That is, when the layer density of the barrier layer 1162 is less than 2.80 g / cm 3 , the function of suppressing the intrusion of moisture and hydrogen is drastically reduced, and the channel layers 104 and 105 are significantly deteriorated (the sheet resistance value is lowered). become.
- the layer density of the barrier layer 1162 is desirably 3.25 g / cm 3 or less. This is because the wet etching method is used for the barrier layer 1162 when the contact hole for forming the upper electrode 117 is formed, but in the range where the layer density exceeds 3.25 g / cm 3 , the etching is performed. It is desirable that the rate is very small and 3.25 g / cm 3 or less from the viewpoint of production efficiency.
- the lower insulating layer 1161 can be formed using silicon nitride (SiN) or silicon oxynitride (SiON) in addition to the above materials, and the upper insulating layer 1163 can be formed using silicon oxide (SiO) or silicon oxide other than the above materials. Silicon oxynitride (SiON) can also be used.
- the thickness of the passivation layer 116 can be in the range of 200 [nm] to 1000 [nm], and is preferably 600 [nm] or less.
- Upper electrode 117 As the upper electrode 117, a laminate (Cu: 300 [nm] + ITO: 70 [nm]) of copper (Cu) and indium tin oxide (ITO) is employed. Note that the material used for the structure of the upper electrode 117 is not limited to this, and can be appropriately selected from conductive materials.
- Interlayer insulating layer 118 is formed using an organic compound such as polyimide, polyamide, or acrylic resin material.
- the anode 119 is made of a metal material containing silver (Ag) or aluminum (Al).
- the surface portion thereof preferably has high reflectivity.
- the anode 119 not only a single layer structure made of the metal material as described above but also a laminate of a metal layer and a transparent conductive layer can be adopted.
- a constituent material of the transparent conductive layer for example, indium tin oxide (ITO), indium zinc oxide (IZO), or the like can be used.
- the hole injection layer 120 may be formed of, for example, an oxide such as silver (Ag), molybdenum (Mo), chromium (Cr), vanadium (V), tungsten (W), nickel (Ni), iridium (Ir), or PEDOT. It is a layer made of a conductive polymer material such as (mixture of polythiophene and polystyrene sulfonic acid). In the display panel 10 according to the present embodiment shown in FIG. 3, it is assumed that the hole injection layer 120 made of a metal oxide is formed. In this case, a conductive polymer material such as PEDOT is used. Compared with the case of using, it has a function of injecting holes into the organic light emitting layer 108 stably or assisting the generation of holes, and has a large work function.
- an oxide such as silver (Ag), molybdenum (Mo), chromium (Cr), vanadium (V), tungsten (W), nickel (Ni), iridium (I
- the hole injection layer 120 is composed of an oxide of a transition metal
- a plurality of levels can be obtained by taking a plurality of oxidation numbers.
- hole injection is facilitated and the driving voltage is increased.
- WO X tungsten oxide
- the bank 121 is formed using an organic material such as a resin and has an insulating property.
- the organic material used for forming the bank 121 include acrylic resin, polyimide resin, and novolac type phenol resin.
- the bank 121 preferably has organic solvent resistance.
- the bank 121 since the bank 121 may be subjected to an etching process, a baking process, or the like during the manufacturing process, the bank 121 is formed of a highly resistant material that does not excessively deform or alter the process. Is preferred.
- the surface can be treated with fluorine.
- the bank 121 is formed using a lyophilic material
- the difference in lyophilicity / liquid repellency between the surface of the bank 121 and the surface of the light emitting layer 123 is reduced, and the light emitting layer 123 is formed. This is because it becomes difficult to selectively hold ink containing an organic substance in the opening defined by the bank 121.
- the structure of the bank 121 not only a single layer structure as shown in FIG. 3 but also a multilayer structure of two or more layers can be adopted.
- the above materials can be combined for each layer, and an inorganic material and an organic material can be used for each layer.
- the hole transport layer 122 is formed using a polymer compound having no hydrophilic group.
- a polymer compound having no hydrophilic group for example, polyfluorene or a derivative thereof, or a polymer compound such as polyarylamine or a derivative thereof that does not have a hydrophilic group can be used.
- the light emitting layer 123 has a function of emitting light by generating an excited state when holes and electrons are injected and recombined.
- the material used for forming the light-emitting layer 123 needs to be a light-emitting organic material that can be formed by a wet printing method.
- the oxinoid compound, perylene compound, coumarin compound, azacoumarin compound, oxazole compound, oxadiazole compound, perinone compound, pyrrolopyrrole described in Japanese Patent Publication (JP-A-5-163488) Compound, naphthalene compound, anthracene compound, fluorene compound, fluoranthene compound, tetracene compound, pyrene compound, coronene compound, quinolone compound and azaquinolone compound, pyrazoline derivative and pyrazolone derivative, rhodamine compound, chrysene compound, phenanthrene compound, cyclopentadiene compound, stilbene compound , Diphenylquinone compound, styryl compound, butadiene compound, dicyanomethylenepyran compound, dicyanomethylenethiopyran compound, fluoro Cein compounds, pyrylium compounds, thiapyrylium compounds, seren
- Electron transport layer 124 has a function of transporting electrons injected from the cathode 125 to the light emitting layer 123.
- an oxadiazole derivative (OXD), a triazole derivative (TAZ), a phenanthroline derivative (BCP, Bphen) Etc. are formed.
- the cathode 125 is formed using, for example, indium tin oxide (ITO) or indium zinc oxide (IZO).
- ITO indium tin oxide
- IZO indium zinc oxide
- permeability shall be 80 [%] or more.
- the sealing layer 126 has a function of suppressing exposure of an organic layer such as the light emitting layer 123 to moisture or exposure to air.
- an organic layer such as the light emitting layer 123 to moisture or exposure to air.
- a sealing resin layer made of a resin material such as an acrylic resin or a silicone resin may be provided over a layer formed using a material such as silicon nitride (SiN) or silicon oxynitride (SiON).
- the sealing layer 126 needs to be formed of a light-transmitting material.
- gate electrodes 101 and 102 are formed on the surface 100a on the upper side in the Z-axis direction of the substrate 100.
- the gate electrodes 101 and 102 can be formed as follows.
- a metal thin film made of Cu and a metal thin film made of Mo are sequentially laminated using a metal sputtering method, and a resist pattern is formed thereon using a photolithography method.
- the resist pattern is removed. Thereby, the gate electrodes 101 and 102 are formed.
- the gate insulating layer 1030 is formed so as to cover the surfaces of the gate electrodes 101 and 102 and the substrate 100, and the gate Channel layers 104 and 105 are formed on the surface 1030a of the insulating layer 1030 so as to be spaced apart from each other.
- the gate insulating layer 1030 is formed by sequentially stacking a layer made of SiO and a layer made of SiN using a plasma CVD (Chemical Vapor Deposition) method or a sputtering method.
- the film formation conditions of the gate insulating layer 1030 are, for example, a film formation temperature of 300 [° C.] to 400 [° C.].
- the channel layers 104 and 105 are formed by forming an oxide semiconductor film using a sputtering method and patterning using a photolithography method and a wet etching method.
- the channel protection layer 1060 is formed so as to cover the channel layers 104 and 105 and the surface 1030a of the gate insulating layer 1030.
- the channel protective layer 1060 is formed by using a plasma CVD method or a sputtering method, by laminating and forming a layer made of SiO, and performing an annealing process at a temperature equal to or higher than the film formation temperature in a dry air or oxygen atmosphere after the film formation. Made.
- the channel protective layer 1060 is formed at a film formation temperature of 300 [° C.] or lower.
- the annealing process is performed to repair oxygen defects in the channel layers 104 and 105 and maintain semiconductor characteristics.
- Source Electrodes 107 and 110 and Drain Electrodes 108 and 109 are formed on the surface 1060a of the channel protective layer 1060. Form. Further, source lower electrodes 111 and 115, drain lower electrodes 112 and 114, and contact plugs 113 are formed corresponding to the source electrodes 107 and 110 and the drain electrodes 107 and 110, respectively.
- a contact hole is made in a corresponding portion of the channel protective layer 1060.
- the contact hole is formed by patterning using a photolithography method and then performing etching using a dry etching method.
- a metal thin film made of CuMn, a metal thin film made of Cu, and a metal thin film made of Mo are sequentially laminated. Then, the source electrodes 107 and 110 and the drain electrodes 108 and 109 are formed by patterning using a photolithography method and a wet etching method.
- the source lower electrodes 111 and 115, the drain lower electrodes 112 and 114, and the contact plug 113 to the channel protective layer 106 may be formed prior to the formation of the metal thin film, or the formation of the metal thin film. It is good also as forming in the case of a film
- the lower insulating layer 11610 is formed by performing an annealing process in a dry air or oxygen atmosphere after forming the film using a plasma CVD method or a sputtering method.
- the channel layers 104 and 105 are reduced in resistance due to oxygen deficiency by being placed under vacuum at the time of film formation. Recovery is made.
- the barrier layer 11620 is formed by a CVD method, an ALD (Atomic Layer Deposition) method, or a sputtering method. Note that the thickness of the barrier layer 11620 is preferably 100 [nm] or less. This is because if the layer thickness is too thick, the processing time becomes long.
- the upper insulating layer 11630 is formed by a plasma CVD method or a sputtering method.
- a contact hole 116a is opened at a position on the source electrode 110 in the passivation layer 116.
- the contact hole 116a is formed so that the surface 110a of the source electrode 110 is exposed at the bottom thereof.
- the opening of the contact hole 116a is performed as follows.
- a hole 1163a is opened in the upper insulating layer 1163 by using a dry etching method.
- the surface 11620a of the barrier layer 11620 is exposed at the bottom thereof.
- the dry etching conditions can be the following conditions, for example.
- a hole 1162a is formed in the barrier layer 1162 by using a wet etching method.
- the surface 11610a of the lower insulating layer 11610 is exposed at the bottom of the hole 1162a.
- a PAN (phosphoric acid / acetic acid / nitric acid) etchant was used for wet etching.
- a dry etching method is used to open a hole in the lower insulating layer 1161 to complete the contact hole 116a.
- the surface 110a of the source electrode 110 is exposed at the bottom of the contact hole 116a.
- the dry etching conditions can be the following conditions, for example.
- the upper electrode 117 is formed along the inner wall of the contact hole 116a formed in the passivation layer 116. A part of the upper portion of the upper electrode 117 is disposed on the upper insulating layer 1163. Then, an interlayer insulating layer 1180 is stacked so as to cover the upper electrode 117 and the passivation layer 116.
- the upper electrode 117 is formed by sputtering, forming a metal film, and then patterning using a photolithography method and a wet etching method.
- the interlayer insulating layer 1180 is formed by applying the organic material and planarizing the surface.
- Formation of Anode 119 As shown in FIG. 5D, a contact hole is formed on the upper electrode 117 in the interlayer insulating layer 1180, and the anode 119 is formed.
- the anode 119 is formed by forming a metal film using a sputtering method or a vacuum deposition method, and then patterning using a photolithography method and an etching method. Note that the anode 119 is electrically connected to the upper electrode 117.
- the hole injection layer 120 is formed on the anode 119, and the bank 121 is formed so as to cover the edge.
- the bank 121 surrounds the opening 121a that defines each subpixel, and is provided so that the surface 120a of the hole injection layer 120 is exposed at the bottom.
- the hole injection layer 120 is formed by forming a film made of a metal oxide (for example, tungsten oxide) using a sputtering method and then patterning each subpixel unit using a photolithography method and an etching method.
- a metal oxide for example, tungsten oxide
- a film made of a constituent material of the bank 121 is formed on the hole injection layer 120 by using a spin coat method or the like. Then, the resin film is patterned to open the opening 121a.
- the opening 121a is formed by arranging a mask above the resin film and exposing it, followed by development.
- the hole transport layer 122 is formed by applying an ink containing a constituent material into the opening 121a defined by the bank 121 and then baking it using a printing method.
- the light emitting layer 123 is also formed by applying an ink containing a constituent material onto the hole transport layer 122 and baking it using a printing method.
- the cathode 125 and the sealing layer 126 can be formed using a sputtering method or the like.
- the laminated display panel 10 is completed by interposing the substrate 130 on which the color filter layer 1128 and the like are formed with the bonding layer 127 interposed therebetween.
- the channel layers 104 and 105 are formed of an oxide semiconductor (IGZO), they have high electron mobility and excellent electrical characteristics. For this reason, high electron mobility can be expected without depending on the temperature.
- IGZO oxide semiconductor
- the passivation layer 116 has a stacked structure including a lower insulating layer 1161 as a first layer, a barrier layer 1162 as a second layer, and an upper insulating layer 1163 as a third layer.
- the barrier layer 1162 is a layer made of aluminum oxide, the intrusion of moisture and hydrogen can be suppressed (barrier), and the channel layers 104 and 105 made of IGZO can be protected (deterioration suppression).
- the passivation layer 116 has a stacked structure in which at least the upper and lower sides of the barrier layer 1162 are sandwiched between the lower insulating layer 1161 and the upper insulating layer 1163, and thus the passivation layer 116 is provided.
- the contact hole 116a is opened, the yield is hardly lowered. That is, a dry etching method can be used for opening holes in the lower insulating layer 1161 and the upper insulating layer 1163 of the passivation layer 116, and a wet etching method can be used for opening holes in the barrier layer 1162 (FIG. 7 (a), (b), (c)).
- Embodiment 2 The configuration of the display panel 30 according to Embodiment 2 of the present invention will be described with reference to FIG. In FIG. 8, only a part of the configuration of the display panel 30 is extracted and illustrated, and the configuration of the portion that is not illustrated is the same as that of the display panel 10 according to the first embodiment. . In FIG. 8 as well, parts having the same configuration as the display panel 10 according to the first embodiment are given the same reference numerals.
- an interlayer insulating layer 331 is formed so as to cover the source electrodes 107 and 110, the drain electrodes 108 and 109, and the channel protective layer 106.
- a passivation layer 316 is formed thereon.
- the upper electrode 317 connected to the source electrode 110 is formed along the inner wall of the contact hole formed in the interlayer insulating layer 331, and a part of the upper part is a boundary between the interlayer insulating layer 331 and the passivation layer 316. It is inserted in the part.
- the passivation layer 316 has a stacked structure in which a lower insulating layer 3161, a barrier layer 3162, and an upper insulating layer 3163 are stacked in this order from the lower side in the Z-axis direction, and the barrier layer 3162 is made of aluminum. It is comprised by the layer (For example, the layer which consists of aluminum oxide) which consists of these compounds.
- the lower insulating layer 3161 and the upper insulating layer 3163 are each made of silicon oxide, silicon nitride, or silicon oxynitride.
- An anode 319 is formed on the passivation layer 316 with an interlayer insulating layer 318 interposed therebetween.
- the anode 319 is electrically connected to the upper electrode 317 through a contact hole formed in the interlayer insulating layer 318 and the passivation layer 316.
- the channel layers 104 and 105 are formed of an oxide semiconductor (IGZO), they have high electron mobility and excellent electrical characteristics. For this reason, high electron mobility can be expected without depending on the temperature.
- IGZO oxide semiconductor
- the passivation layer 316 includes the barrier layer 3162 made of an aluminum compound such as aluminum oxide, the channel layer 104 made of IGZO is suppressed (barrier) from entry of moisture and hydrogen. , 105 can be protected (deterioration suppression).
- the passivation layer 316 has the same stacked structure as described above, it is difficult to reduce the yield when the contact hole is formed in the passivation layer 316.
- Embodiment 3 The configuration of the display panel 50 according to Embodiment 3 of the present invention will be described with reference to FIG. Also in FIG. 9, only a partial configuration of the display panel 50 is extracted and illustrated, and the same configuration as the display panel 10 according to the first embodiment is adopted for the configuration of the portion that is not illustrated. Yes. In FIG. 9 as well, parts having the same configuration as the display panel 10 according to the first embodiment are given the same reference numerals.
- the passivation layer 516 formed so as to cover the source electrodes 107 and 110, the drain electrodes 108 and 109, and the channel protective layer 106 has a five-layer structure.
- a lower insulating layer 5161 made of SiO a barrier layer 5162 made of an aluminum compound (for example, AlOx), an upper insulating layer 5163 made of SiO, and an upper insulating layer 5164 made of SiN.
- an upper insulating layer 5165 made of SiN in order from the lower side in the Z-axis direction.
- the upper electrode 517 is formed along the inner wall of the contact hole formed in the lower insulating layer 5161, the barrier layer 5162, the upper insulating layer 5163, and the upper insulating layer 5164, and a part of the upper electrode 517 is isolated from the upper insulating layer 5164. An interface portion is interposed between the layer 5165.
- An anode 519 is formed on the passivation layer 516 via an interlayer insulating layer 518, and the anode 519 is electrically connected to the upper electrode 517 through contact holes formed in the interlayer insulating layer 518 and the upper insulating layer 5165. It is connected.
- the same effects as those of the first and second embodiments can be obtained, and further improvement in moisture resistance can be achieved. That is, by further stacking the upper insulating layer 5165 made of SiN on the upper electrode 517, it is possible to further improve the moisture resistance.
- Embodiment 4 The configuration of the display panel 70 according to Embodiment 4 of the present invention will be described with reference to FIG. Also in FIG. 10, only a part of the configuration of the display panel 70 is extracted and illustrated, and the same configuration as the display panel 10 according to the first embodiment is adopted for the configuration of the portion not illustrated. Yes. In FIG. 10 as well, parts having the same configuration as the display panel 10 according to the first embodiment are given the same reference numerals.
- the passivation layer 716 formed so as to cover the source electrodes 107 and 110, the drain electrodes 108 and 109, and the channel protective layer 106 has a four-layer structure.
- a lower insulating layer 7161 made of SiO a barrier layer 7162 made of an aluminum compound (for example, AlOx), an upper insulating layer 7163 made of SiN, and an upper insulating layer 7164 made of SiN. It has the laminated structure of.
- the density of the upper insulating layer 7164 is lower than the density of the upper insulating layer 7163, which facilitates taper when the contact hole is opened.
- the upper electrode 717 is formed along the inner wall over which the contact hole opened in the lower insulating layer 7161, the barrier layer 7162, and the upper insulating layer 7163 is formed. A part of the upper electrode 717 is formed between the upper insulating layer 7164 and the interlayer insulating layer 718. It is inserted in the interface part.
- An anode 719 is formed on the passivation layer 716 with an interlayer insulating layer 718 interposed therebetween, and the connection form between the anode 719 and the upper electrode 717 is the same as described above.
- Embodiment 5 1. Configuration The configuration of the display panel 80 according to Embodiment 5 of the present invention will be described with reference to FIG. Also in FIG. 11, only a part of the configuration of the display panel 80 is extracted and illustrated, and the same configuration as the display panel 10 according to the first embodiment is adopted for the configuration of the portion not illustrated. Yes. In FIG. 11 as well, parts having the same configuration as the display panel 10 according to the first embodiment are given the same reference numerals.
- the constituent materials of the electrodes 802, 809, 810, 814, 815, and 817 are different from those of the first to fourth embodiments.
- the gate electrode 802 has a stacked structure in which molybdenum (Mo) and copper (Cu) are sequentially stacked from the substrate 100 side (the lower side in the Z-axis direction).
- the source electrode 810, the drain electrode 809, the source lower electrode 815, and the drain lower electrode 814 are respectively molybdenum (Mo), copper (Cu), and manganese-copper (from the substrate 100 side (the lower side in the Z-axis direction)).
- Mo molybdenum
- Cu copper
- Mn manganese-copper
- the upper electrode 817 has a stacked structure in which indium tin oxide (ITO), molybdenum (Mo), and copper (Cu) are sequentially stacked from the substrate 100 side (the lower side in the Z-axis direction). That is, in the display panel 80 according to the present embodiment, the electrodes and wirings in the TFT layer are formed using a Cu-based material. This is because, by using a Cu-based material having a low electrical resistance as the material for the electrodes and wiring, even when the wiring book is increased due to an increase in the size of the panel, it is possible to suppress the delay in the propagation of the voltage pulse, and image display unevenness. This is because it is possible to suppress this. Regarding the wiring resistance, the following documents can be referred to.
- the passivation layer 816 in the TFT layer includes the lower insulating layer 8161, the barrier layer 8162, and the upper insulating layer 8163 from the substrate 100 side (the lower side in the Z-axis direction). It has a laminated structure that is laminated in order.
- the lower insulating layer 8161 is made of silicon oxide (SiO), and the barrier layer 8162 is made of aluminum oxide (AlOx).
- the upper insulating layer 8163 has a stacked structure in which silicon oxide (SiO) and silicon nitride (SiN) are sequentially stacked from the substrate 100 side (the lower side in the Z-axis direction). 2. Layer thickness and process conditions of each of layers 8161 to 8163 constituting passivation layer 816 As described above, in the display panel 80 according to the present embodiment, the electrodes 802, 809, 810, 814, 815, and 817 in the TFT layer are configured using the Cu-based material.
- Lower insulating layer 8161 (I) Layer Thickness About the layer thickness of the lower insulating layer 8161, it is desirable to ensure 200 [nm] or more.
- the upper electrode is filled with voids at the corner portion at the bottom of the contact hole.
- the layer thickness of the lower insulating layer was 50 [nm]
- 120 [nm] voids entered.
- the upper electrode was filled with voids. In this case, the length of the void was 60 [nm].
- the present inventors have found that there is a correlation between the thickness of the lower insulating layer and whether or not voids enter the upper electrode, and studied the mechanism. This will be described with reference to FIG.
- an upper electrode when an upper electrode is to be formed by sputtering, it has a flight path of metal particles as indicated by arrows. Then, when the film is formed, metal particles gather at the central portion in the depth direction (Z-axis direction) of the contact hole with respect to the side wall 8661a where the contact hole in the lower insulating layer 8661 is desired. This is due to migration of metal particles attached to the side wall 8661a. As a result, as shown in FIG. 13A, metal deposition proceeds at the center of the side wall 8661a, and the flight path of metal particles to the lower portion (corner portion) of the side wall 8661a indicated by the arrow A is blocked. . It is considered that the voids of the upper electrode generated when the lower insulating layer 8661 is thin are generated in this way.
- the thickness of the lower insulating layer 8161 be 200 [nm] or more from the viewpoint of ensuring the function as a device.
- the lower insulating layer 8161 should be thicker if it is secured to 200 [nm] or more. It is also preferable that the channel layer 104 or 105 is thicker from the viewpoint of suppressing the influence of fixed charges generated at the interface between the barrier layer 8162 and the layer sandwiching the barrier layer 8162.
- the thickness of the lower insulating layer 8161 is 600 [nm] or less.
- the film formation temperature is preferably 230 [° C.] or lower. This is because if high-temperature film formation higher than 230 [° C.] is performed, Mn in CuMn of the source electrode 810 and the drain electrode 809 is precipitated, and the surface of the source electrode 810 and the drain electrode 809 Because there is.
- the deposition temperature of the lower insulating layer 8161 is desirably set to 230 [° C.] or lower.
- N 2 O nitrous oxide gas
- Ar argon gas
- Ar when Ar is employed, Ar penetrates the channel protective layer 106 and reaches the channel layer 105 due to high energy Ar collision during film formation, and damages the channel layer 105.
- the flow rate of the silane gas (SiH 4 ) is preferably specified so as to satisfy the relationship of SiH 4 / (SiH 4 + N 2 O) ⁇ 1.1 [%]. This is because the flow rate of SiH 4 is reduced to reduce the amount of hydrogen (H) in the lower insulating layer 8161 and damage due to hydrogen (H) during film formation.
- the passivation layer 816 employs a stacked structure in which the upper insulating layer 8163 is sequentially stacked from the substrate 100 side with the SiO layer and the SiN layer. .
- the layer thickness of the SiO layer in the upper insulating layer 8163 is desirably 100 [nm] or more, and the layer thickness of the SiN layer is desirably 200 [nm] or more. This is from the viewpoint of ensuring a withstand voltage of 200 [V] or higher between the source electrode 810 / drain electrode 809 and the upper electrode 817.
- the present inventors made four types of samples for the combination of the layer thickness of the SiO layer and the layer thickness of the SiN layer in the upper insulating layer, and measured the withstand voltage between the source electrode / drain electrode and the upper electrode. did. The results are shown in FIGS. 14 (a) to (d). Note that the SiO layer and the SiN layer used in this measurement were formed at a film formation temperature of 290 [° C.]. When the film formation temperature is changed, the film quality of each layer also changes, and therefore it is refused in advance that the relationship between the layer thickness and the breakdown voltage of each layer also changes.
- the breakdown voltage is 40 [V] or less.
- the breakdown voltage is 60 [V] or more and 80 [V] or more. It was.
- the layer thicknesses t1 to t3 of the respective layers 8161 to 8163 constituting the passivation layer 816 are defined as follows, for example.
- the lower insulating layer 8161 is made of SiO, it is necessary to form the film at a low temperature ( ⁇ 230 [° C.]).
- the breakdown voltage of the layer 816 does not greatly contribute.
- the barrier layer 8162 has an extremely thin layer thickness of 30 [nm], and thus does not greatly contribute to the breakdown voltage of the passivation layer 816.
- the layer thickness of the SiN layer of the upper insulating layer 8163 greatly contributes to the breakdown voltage of the passivation layer 816. Therefore, the thickness of the upper insulating layer 8163 in the passivation layer 816, particularly the SiN layer, is desirably secured to 200 [nm] or more from the viewpoint of securing a breakdown voltage.
- the film formation temperature is preferably higher than 230 [° C.] and lower than 300 [° C.]. This is to consider both the viewpoint of adhesion between the barrier layer 8162 and the upper insulating layer 8163 in the passivation layer 816 and the viewpoint of suppressing deformation of the source electrode 810 and the drain electrode 809.
- FIGS. 16A shows a case where the film formation temperature is 230 ° C.
- FIG. 16B shows a case where the film formation temperature is 290 ° C. between the barrier layer 8162 and the upper insulating layer 8163.
- 5 is a micrograph after contact hole formation showing whether or not “film floating” occurs. Deposition conditions other than the film formation temperature are as follows.
- Upper insulating layer 8163: SiN / SiO 200 [nm] / 100 [Nm] Annealing after the formation of the upper insulating layer 8163: 300 [° C.], 1 [hr. In a dry air atmosphere In this embodiment, annealing is performed after the upper insulating layer 8163 is formed. This is because the substrate is evacuated during film formation of silicon oxide, silicon nitride, silicon oxynitride, or a stacked film thereof.
- the channel layer 105 made of an oxide semiconductor is deficient and the resistance is reduced, but the high resistance state of the channel layer 105 can be maintained by performing annealing after the formation of the upper insulating layer 8163. .
- deformation of the electrodes 802, 809, and 810 formed in the lower layer can be prevented.
- the film formation temperature is set to 230 [° C.]
- the probability of film floating between the barrier layer and the upper insulating layer is increased after the contact hole is formed.
- the whitened portion around the contact hole in FIG. 16 (a) is where the film floats.
- the film forming temperature is higher than 230 ° C., the probability of film floating is low. In particular, if the film forming temperature is 250 [° C.] or higher, the level can be practically not problematic.
- FIG. 17 is a photomicrograph when the upper insulating layer is formed at a temperature of 300 [° C.]. As shown in FIG. 17, when the film is formed at a temperature of 300 ° C., Cu in the source electrode and the drain electrode undergoes migration and deforms (Cu deformed portion). As a result, the deformed Cu breaks through the passivation layer, causing a short circuit with the upper electrode formed thereon.
- the deposition temperature of the upper insulating layer 8163 in the passivation layer 816 be less than 300 [° C.].
- each electrode is provided in order to keep the wiring resistance low so that the panel can be enlarged.
- Cu-based materials are used as constituent materials of 802, 809, 810, 814, 815, and 817.
- H diffusion coefficient of hydrogen
- the diffusion coefficient of hydrogen (H) at 300 [° C.] is 10 ⁇ 6 [cm 2 / s]
- the diffusion coefficient of hydrogen (H) in Mo under the same temperature condition is It is an order of magnitude larger than 10 ⁇ 7 [cm 2 / s].
- Hydrogen (H) is desorbed and diffused from the SiN layer in the upper insulating layer by performing various heat treatments after the formation of the contact holes.
- the diffused hydrogen (H) may propagate through a Cu-based electrode or the like formed along the side wall where the contact hole is desired to reach the channel layer. The propagation mechanism of hydrogen (H) will be described using two specific examples.
- the passivation layer 826 is composed of four layers 8261 to 8264, and the upper insulating layer 8264 at the upper part in the Z-axis direction is composed of SiN.
- a contact hole 826a is formed in the passivation layer 826, and an ITO layer 827 as a part of the upper electrode is formed in this portion.
- the ITO layer 827 it is necessary to perform a crystallization process at a stage before the upper layer is laminated, and heat treatment is performed in this process.
- the heat treatment in the crystallization process of the ITO layer 827 is, for example, 250 [° C.], 30 [min. ], And executed under the condition of a dry air atmosphere.
- hydrogen (H) desorbed from SiN constituting the upper insulating layer 8264 propagates through the ITO, the source electrode 810, and the source lower electrode 815.
- diffusion is performed up to the channel layer 105 made of an oxide semiconductor.
- the oxide semiconductor included in the channel layer 105 is reduced by hydrogen (H), resulting in a decrease in electrical resistance.
- an upper electrode 837 of the TFT layer is formed, an interlayer insulating layer 838 is deposited so as to cover it, and then an interlayer insulating layer 838 is formed.
- a contact hole 838a is formed in The contact hole 838a is for connecting the upper electrode 837 and the anode.
- the upper electrode 837 includes a Cu-based material.
- heat treatment is performed after opening the contact hole 838a in the interlayer insulating layer 838.
- the heat treatment conditions are, for example, 250 [° C.] and 1 [hr. ].
- hydrogen (H) desorbed from SiN of the upper insulating layer 8264 propagates through the upper electrode 837, the source electrode 810, and the source lower electrode 815 to be oxidized. It diffuses to the channel layer 105 made of a physical semiconductor.
- hydrogen (H) hydrogen
- the oxide semiconductor constituting the channel layer 105 is reduced by hydrogen (H), resulting in a decrease in electrical resistance.
- the thickness of the upper insulating layer is increased, the breakdown voltage between the source / drain electrodes and the upper electrode can be improved, but the total amount of hydrogen (H) in the upper insulating layer increases. Therefore, it is not preferable to increase the layer thickness more than necessary.
- a G8.5 glass substrate (2500 mm W ⁇ 2200 mm H ⁇ 0.7 mm t ) is used for monitoring at the center portion P cent and corner portion P edge .
- a substrate with a Si substrate attached is prepared.
- the corner portion P edge is near an orientation flat (chamfered portion) for discriminating the front and back sides and the direction of the substrate.
- a silicon nitride (SiN) film was formed on the test sample using a PECVD (Plasma-Enhanced Chemical Vapor Deposition) apparatus.
- the film forming conditions for each of Samples 1 to 3 are as shown in FIG.
- the film forming time was adjusted so that the film thickness was 400 [nm].
- each data shown in FIG. 19B was measured and evaluated under the following conditions.
- SiH / NH value The amount of SiH and NH bonds in SiN was evaluated by FT-IR spectroscopy (Fourier Transform Infrared Spectroscopy). And SiH / NH value was computed from there.
- Sample 1 has a higher deposition rate than Samples 2 and 3, and the average stress is close to "0". Moreover, the result was that the amount of hydrogen (SiH / NH) was large.
- Sample 2 has the same film formation rate and SiH / NH value as Sample 3, SiH / NH is "0.10" or less, and the average stress is close to "0".
- Sample 3 has the same film formation rate and SiH / NH values as Sample 2 as described above. In sample 3, the stress is applied in the compression direction.
- the threshold voltage Vth depends on the SiN condition. Sex was confirmed. Specifically, it was found that the threshold voltage Vth may be 1 [V] or less in the TFT manufactured using the sample 1 when the SiN film thickness is 200 [nm] or more.
- the threshold voltage Vth did not decrease as in the TFT using the sample 1. This is because, even if a barrier layer made of AlOx is provided as a constituent layer of the passivation layer, when considering the characteristics that the Cu-based electrode easily transmits hydrogen (H), the SiH in the SiN film constituting the upper insulating layer is considered. This indicates that the decrease can be suppressed by setting the value of / NH to “0.10 or less”.
- the data shown in FIG. 20B is a result of measuring the amount of sag at the edge of the substrate from the horizontal reference by placing the substrate on a stage with an edge 20 [cm] inside from the peripheral edge of the substrate.
- the sagging amount of the substrate of the sample 3 is 4.25 [mm] when the film thickness is 100 [nm], and 4.5 [mm] when the film thickness is 200 [nm]. As the film thickness increases, the amount of sagging of the substrate tends to increase.
- the layer 716 is employed, a passivation layer having a laminated structure of six layers or more can also be employed. However, it is necessary to provide a structure in which the upper and lower sides of a barrier layer made of AlOx or the like are sandwiched between insulating layers made of SiO, SiN, or SiON.
- the layer thickness is 1000 nm or less (more preferably 600 nm or less) as in the first embodiment.
- the top emission type EL display panel is taken as an example, but the present invention is not limited to this.
- it can be applied to a bottom emission type display panel or the like, and can also be applied to a liquid crystal panel, a field emission display panel, electronic paper, or the like.
- the configuration in which the two transistor element portions Tr 1 and Tr 2 are provided for one subpixel 10a is adopted.
- the present invention is not limited to this. Absent.
- one transistor element unit may be provided for one subpixel, or three or more transistor element units may be provided.
- the constituent materials of each part can be changed as appropriate.
- the barrier layer in the passivation layer is not limited to AlOx, and a nitride or oxynitride containing Al can also be employed.
- the constituent materials of the gate electrode, the source electrode, and the drain electrode also include, for example, a laminated structure of a layer made of Mo and a layer made of Al, a layer made of Mo, and an alloy layer made of Al—Nd. It can also be set as a laminated structure.
- a layer made of silicon nitride (SiN) is used as the upper insulating layer 8163 in the passivation layer 816, but a layer made of silicon oxynitride (SiON) can also be used.
- the anode is arranged below the EL element portion, and the anode 119, 319, 519, 719 is connected to the source electrode 110 of the TFT device.
- a configuration in which a cathode is arranged at the bottom and an anode at the top can be adopted. In this case, a cathode disposed below is connected to the drain of the TFT device.
- the present invention is useful for realizing a thin film transistor device having high electrical characteristics and capable of improving yield in production due to high workability.
- Subpixel 20. Drive / control section 21-24.
- Substrate 101, 102, 802. Gate electrode 103,1030.
- Passivation layer 117,317,517,717,817,837.
- Anode 120 Hole injection layer 121. Bank 122. Hole transport layer 123. Light emitting layer 124. Electron transport layer 125. Cathode 126. Sealing layer 127. Bonding layer 128. Color filter layer 129. Light shielding layer 827. ITO layers 1161, 3161, 5161, 7161, 8161, 8261, 11610. Lower insulating layers 1162, 3162, 5162, 7162, 8162, 8262, 11620. Barrier layers 1163, 3163, 5163, 5164, 5165, 7163, 7164, 8163, 8263, 8264, 11630. Upper insulating layer EL. EL element portion Tr 1 . Drive transistor element portion Tr 2 . Switching transistor element section C.I. capacity
Abstract
Description
本発明の一態様に係る薄膜トランジスタ装置(以下、「TFT装置」と記載する。)は、(i)基板と、(ii)ゲート電極と、(iii)ソース電極およびドレイン電極と、(iv)チャネル層と、(v)パッシベーション層とを備える。
(iv-1) 酸化シリコン、窒化シリコン、酸窒化シリコンの何れかの材料を用い、チャネル層、およびゲート電極、およびソース電極、およびドレイン電極の上方を覆う第1準備膜を成膜する。
1.表示装置1の全体構成
以下では、本発明の実施の形態1に係る表示装置1の全体構成について、図1を用い説明する。
表示パネル10における各サブピクセル10aの回路構成について、図2を用い説明する。
表示パネル10の構成について、図3の模式断面図を用い説明する。
図3に示すように、基板100上には、ゲート電極101,102が互いに間隔をあけて形成され、ゲート電極101,102および基板100の表面を被覆するように、ゲート絶縁層103が形成されている。ゲート絶縁層103上には、ゲート電極101,102のそれぞれに対応してチャネル層104,105が形成されている。そして、チャネル層104,105およびゲート絶縁層103の表面を被覆するように、チャネル保護層106が形成されている。
層間絶縁層118上には、サブピクセル単位でアノード119が設けられている。アノード119は、層間絶縁層118における上部電極117の上方に開設されたコンタクト孔を通して、上部電極117に接続されている。
図3に示す各部の構成材料について、一例を示す。
基板100,130の構成材料としては、例えば、ガラス基板、石英基板、シリコン基板、硫化モリブデン、銅、亜鉛、アルミニウム、ステンレス、マグネシウム、鉄、ニッケル、金、銀などの金属基板、ガリウム砒素基などの半導体基板、プラスチック基板等を採用することができる。
ゲート電極101,102としては、例えば、銅(Cu)とモリブデン(Mo)との積層体(Cu:200[nm]+Mo:20[nm])を採用している。ただし、ゲート電極101,102の構成については、これに限定されず、例えば、Cu、Cu/Wなどを採用することもできるし、次のような材料を採用することも可能である。
ゲート絶縁層103としては、例えば、酸化シリコン(SiO)と窒化シリコン(SiN)との積層体(SiO:80[nm]+SiN:70[nm])を採用している。ただし、ゲート絶縁層103の構成は、これに限定されるものではなく、 ゲート絶縁層の構成材料としては、例えば、電気絶縁性を有する材料であれば、公知の有機材料や無機材料のいずれも用いることができる。
チャネル層104,105としては、アモルファス酸化インジウムガリウム亜鉛(IGZO)からなる層厚が50[nm]の層を採用している。チャネル層104,105の構成材料は、これに限定されるものではなく、インジウム(In)、ガリウム(Ga)、亜鉛(Zn)から選択される少なくとも一種を含む酸化物半導体を採用することができる。
チャネル保護層106としては、酸化シリコン(SiO)からなる層厚が130[nm]の層を採用している。チャネル保護層106の構成材料は、これに限定されるものではなく、例えば、酸窒化シリコン(SiON)、窒化シリコン(SiN)、あるいは酸化アルミニウム(AlOx)を用いることができる。また、上記のような材料を用いた層を複数積層することで構成することもできる。
ソース電極107,110、ドレイン電極108,109としては、銅マンガン(CuMn)と銅(Cu)とモリブデン(Mo)の積層体(CuMn:20[nm]+Cu:300[nm]+Mo:20[nm])を採用している。
本実施の形態に係る表示パネル10では、下部絶縁層1161、バリア層1162、および上部絶縁層1163がZ軸方向下側から順に積層されてなる積層構成を有する。
上部電極117としては、銅(Cu)と酸化インジウムスズ(ITO)との積層体(Cu:300[nm]+ITO:70[nm])を採用している。なお、上部電極117の構成に用いる材料としては、これに限定されるものではなく、導電性を有する材料から適宜選択することが可能である。
層間絶縁層118は、例えば、ポリイミド、ポリアミド、アクリル系樹脂材料などの有機化合物を用い形成されている。
アノード119は、銀(Ag)またはアルミニウム(Al)を含む金属材料から構成されている。トップエミッション型の本実施の形態に係る表示パネル10の場合には、その表面部が高い反射性を有することが好ましい。
ホール注入層120は、例えば、銀(Ag)、モリブデン(Mo)、クロム(Cr)、バナジウム(V)、タングステン(W)、ニッケル(Ni)、イリジウム(Ir)などの酸化物、あるいは、PEDOT(ポリチオフェンとポリスチレンスルホン酸との混合物)などの導電性ポリマー材料からなる層である。なお、図3に示す本実施の形態に係る表示パネル10では、金属酸化物からなるホール注入層120を構成することを想定しているが、この場合には、PEDOTなどの導電性ポリマー材料を用いる場合に比べて、ホールを安定的に、またはホールの生成を補助して、有機発光層108に対しホールを注入する機能を有し、大きな仕事関数を有する。
バンク121は、樹脂等の有機材料を用い形成されており絶縁性を有する。バンク121の形成に用いる有機材料の例としては、アクリル系樹脂、ポリイミド系樹脂、ノボラック型フェノール樹脂等があげられる。バンク121は、有機溶剤耐性を有することが好ましい。さらに、バンク121は、製造工程中において、エッチング処理、ベーク処理など施されることがあるので、それらの処理に対して過度に変形、変質などをしないような耐性の高い材料で形成されることが好ましい。また、表面に撥水性をもたせるために、表面をフッ素処理することもできる。
ホール輸送層122は、親水基を備えない高分子化合物を用い形成されている。例えば、ポリフルオレンやその誘導体、あるいはポリアリールアミンやその誘導体などの高分子化合物であって、親水基を備えないものなどを用いることができる。
発光層123は、上述のように、ホールと電子とが注入され再結合されることにより励起状態が生成され発光する機能を有する。発光層123の形成に用いる材料は、湿式印刷法を用い製膜できる発光性の有機材料を用いることが必要である。
電子輸送層124は、カソード125から注入された電子を発光層123へ輸送する機能を有し、例えば、オキサジアゾール誘導体(OXD)、トリアゾール誘導体(TAZ)、フェナンスロリン誘導体(BCP、Bphen)などを用い形成されている。
カソード125は、例えば、酸化インジウムスズ(ITO)若しくは酸化インジウム亜鉛(IZO)などを用い形成される。本実施の形態のように、トップエミッション型の本実施の形態に係る表示パネル10の場合においては、光透過性の材料で形成されることが必要となる。光透過性については、透過率が80[%]以上とすることが好ましい。
封止層126は、発光層123などの有機層が水分に晒されたり、空気に晒されたりすることを抑制する機能を有し、例えば、窒化シリコン(SiN)、酸窒化シリコン(SiON)などの材料を用い形成される。また、窒化シリコン(SiN)、酸窒化シリコン(SiON)などの材料を用い形成された層の上に、アクリル樹脂、シリコーン樹脂などの樹脂材料からなる封止樹脂層を設けてもよい。
表示パネル10の製造方法について、図4から図7を用い説明する。
図4(a)に示すように、基板100のZ軸方向上側の表面100aに、互いに間隔をあけたゲート電極101,102を形成する。ゲート電極101,102の形成は、具体的に次のように行うことができる。
図4(b)に示すように、ゲート電極101,102および基板100の表面を被覆するように、ゲート絶縁層1030を形成し、ゲート絶縁層1030の表面1030aに互いに間隔をあけたチャネル層104,105を形成する。
図4(c)に示すように、チャネル層104,105およびゲート絶縁層1030の表面1030aを被覆するように、チャネル保護層1060を積層形成する。
図4(c)、(d)に示すように、チャネル保護層1060の表面1060aに、ソース電極107,110およびドレイン電極108,109を形成する。また、ソース電極107,110およびドレイン電極107,110に各々に対応してソース下部電極111,115およびドレイン下部電極112,114およびコンタクトプラグ113を形成する。
図5(a)に示すように、ソース電極107,108およびドレイン電極108,109およびチャネル保護層106を被覆するように、下部絶縁層11610と、バリア層11620と、上部絶縁層11630とを順に積層形成する。
図5(b)に示すように、パッシベーション層116におけるソース電極110上の箇所に、コンタクト孔116aを開設する。コンタクト孔116aは、その底部にソース電極110の表面110aが露出するように形成される。コンタクト孔116aの開設は、次のように実行される。
Pressure=30[mTorr]
ICP/Bias=3000/3000[W]
次に、図7(b)に示すように、ウェットエッチング法を用い、バリア層1162に孔1162aを開設する。孔1162aにおいては、その底部に下部絶縁層11610の表面11610aが露出する。ウェットエッチングは、PAN(リン酸/酢酸/硝酸)系エッチャントを用いた。
Pressure=30[Pa]
ICP/Bias=3000/3000[W]
以上のようにして、パッシベーション層116へのコンタクト孔116aの開設がなされる。
図5(c)に示すように、パッシベーション層116に開設されたコンタクト孔116aの内壁に沿って上部電極117を形成する。上部電極117の上部は、その一部が上部絶縁層1163上に配される。そして、上部電極117およびパッシベーション層116を被覆するように、層間絶縁層1180を積層形成する。
図5(d)に示すように、層間絶縁層1180における上部電極117上にコンタクト孔を開設し、アノード119を形成する。
図6(a)に示すように、アノード119上に対して、ホール注入層120を形成し、その縁部を覆うようにバンク121を形成する。バンク121は、各サブピクセルを規定する開口121aを囲繞し、その底部にホール注入層120の表面120aが露出するように設けられる。
図6(b)に示すように、バンク121で規定された各開口部121a内に、ホール注入層120側から順に、ホール輸送層122、発光層123、および電子輸送層124を積層形成する。
図6(b)、(c)に示すように、電子輸送層123およびバンク121の頂部121bを被覆するように、カソード125および封止層126を順に積層形成する。
本実施の形態に係る表示パネル10が備えるTFT装置では、チャネル層104,105が酸化物半導体(IGZO)から形成されているので、大きな電子移動度を有し、優れた電気特性を有する。このため、温度の高低に依存せず、高い電子移動度が期待できる。
本発明の実施の形態2に係る表示パネル30の構成について、図8を用い説明する。図8では、表示パネル30の一部構成だけを抜き出して図示しており、図示を省略している部分の構成については、上記実施の形態1に係る表示パネル10と同一構成を採用している。また、図8においても、上記実施の形態1に係る表示パネル10と同一構成の部位については、同一の符号を付している。
本発明の実施の形態3に係る表示パネル50の構成について、図9を用い説明する。図9においても、表示パネル50の一部構成だけを抜き出して図示しており、図示を省略している部分の構成については、上記実施の形態1に係る表示パネル10と同一構成を採用している。また、図9においても、上記実施の形態1に係る表示パネル10と同一構成の部位については、同一の符号を付している。
本発明の実施の形態4に係る表示パネル70の構成について、図10を用い説明する。図10においても、表示パネル70の一部構成だけを抜き出して図示しており、図示を省略している部分の構成については、上記実施の形態1に係る表示パネル10と同一構成を採用している。また、図10においても、上記実施の形態1に係る表示パネル10と同一構成の部位については、同一の符号を付している。
1.構成
本発明の実施の形態5に係る表示パネル80の構成について、図11を用い説明する。図11においても、表示パネル80の一部構成だけを抜き出して図示しており、図示を省略している部分の構成については、上記実施の形態1に係る表示パネル10と同一構成を採用している。また、図11においても、上記実施の形態1に係る表示パネル10と同一構成の部位については、同一の符号を付している。
各電極802,809,810,817の構成材料および層厚の一例を示しておく。
・ゲート電極802 Cu/Mo=200[nm]/20[nm]
・ソース電極810・ドレイン電極809 CuMn/Cu/Mo=20[nm]/300[ nm]/20[nm]
・上部電極817 Cu/Mo/ITO=300[nm]/30[nm]/70[nm]
次に、本実施の形態に係る表示パネル80では、TFT層におけるパッシベーション層816が、基板100の側(Z軸方向下側)から、下部絶縁層8161、バリア層8162、および上部絶縁層8163が順に積層された積層構造を有する。下部絶縁層8161は酸化シリコン(SiO)からなり、バリア層8162は酸化アルミニウム(AlOx)からなる。また、上部絶縁層8163は、基板100の側(Z軸方向下側)から、酸化シリコン(SiO)および窒化シリコン(SiN)が順に積層された積層構造を有する。
2.パッシベーション層816を構成する各層8161~8163の層厚およびプロセス条件
上記のように、本実施の形態に係る表示パネル80においては、TFT層における各電極802,809,810,814,815,817についてCu系材料を用い構成するのであるが、このためにTFT層におけるパッシベーション層816の下部絶縁層8161および上部絶縁層8163の層厚およびプロセス条件を規定することが必要である。以下では、構成層ごとに説明する。
(1)下部絶縁層8161
(i)層厚
下部絶縁層8161の層厚については、200[nm]以上確保することが望ましい。
《温度》 成膜温度については、230[℃]以下とすることが望ましい。これは、仮に230[℃]よりも高い高温成膜を行った場合には、ソース電極810およびドレイン電極809のそれぞれのCuMn中のMnが析出してしまい、ソース電極810およびドレイン電極809の表面があれるためである。そして、ソース電極810およびドレイン電極809の表面があれた場合には、下部絶縁層8161との密着性が悪化し、また、上部電極817とのコンタクト特性も悪化する。以上より、下部絶縁層8161の成膜温度は、230[℃]以下とすることが望ましい。
(2)上部絶縁層8163
(i)層厚
上述のように、本実施の形態に係るパッシベーション層816では、上部絶縁層8163が基板100の側から、SiO層とSiN層が順に積層されてなる積層構造を採用している。上部絶縁層8163におけるSiO層の層厚は、100[nm]以上であって、SiN層の層厚は、200[nm]以上であることが望ましい。これは、ソース電極810・ドレイン電極809と上部電極817間における耐圧200[V]以上を確保するという観点からである。
SiO層=260[nm]
(b)SiN層=100[nm]
SiO層=100[nm]
(c)SiN層=100[nm]
SiO層=200[nm]
(d)SiN層=200[nm]
SiO層=100[nm]
なお、耐圧の測定に際しては、パネル内の8か所の測定点におけるリーク電流の測定を行った。
バリア層(AlOx層)8162/t2=30[nm]
上部絶縁層(SiN層/SiO層)8163/t3≧300[nm](SiN層の層厚が200[nm]以上で、SiO層の層厚が100[nm]以上)
上記において、下部絶縁層8161は、SiOから構成されているため、且つ、低温(<230[℃])で成膜する必要があり、これより高品質の膜を形成することができず、パッシベーション層816の耐圧に対して大きくは寄与しない。また、バリア層8162については、その層厚が30[nm]と極薄いため、同様にパッシベーション層816の耐圧には大きくは寄与しない。
《温度》 成膜温度については、230[℃]よりも高く、300[℃]未満であることが望ましい。これは、パッシベーション層816におけるバリア層8162と上部絶縁層8163との密着性の観点、およびソース電極810・ドレイン電極809の変形抑制の観点の両方を考慮するためである。
・バリア層8162:AlOx=30[nm]、室温成膜
・上部絶縁層8163:SiN/SiO=200[nm]/100[nm]
・上部絶縁層8163形成後のアニール:300[℃]、1[hr.]、ドライエア雰囲気下
なお、本実施の形態では、上部絶縁層8163の形成後にアニール処理を実施する。これは、酸化シリコン、窒化シリコン、または酸窒化シリコン、あるいはそれらの積層膜で構成される膜の成膜中においては、基板が真空化におかれる。このため、酸化物半導体からなるチャネル層105の酸素が欠損し、低抵抗化するが、上部絶縁層8163の形成後にアニールを実行することにより、チャネル層105の高抵抗状態を維持できるためである。また、下層に形成された各電極802,809,810などの変形を防ぐこともできるためである。
本実施の形態では、パネルの大型化にも対応できるように、配線抵抗を低く抑えるために各電極802,809,810,814,815,817の構成材料としてCu系の材料を用いている。このようにCu系の材料を用い各電極802,809,810,814,815,817の形成を行った場合には、その中の水素(H)の拡散係数が大きいという問題がある。具体的には、300[℃]での水素(H)の拡散係数は、~10-6[cm2/s]であって、同温度条件下におけるMo中の水素(H)の拡散係数~10-7[cm2/s]と比べて一桁大きい。このように、電極中のCuを伝搬してチャネル層105に水素(H)が到達した場合には、チャネル層105のキャリア濃度が上昇し、抵抗を低下させることとなる。よって、トランジスタのVthをマイナス側へとシフトさせる結果を招く。このような水素(H)伝搬に関するメカニズムについては、例えば、次のような文献を参考とすることができる。
上部絶縁層におけるSiN層からは、コンタクト孔の形成の後に種々の熱処理の実行により水素(H)が脱離し拡散する。そして、拡散した水素(H)は、コンタクト孔を望む側壁に沿って形成されたCu系の電極などを伝搬してチャネル層まで到達してしまうことがある。このような水素(H)の伝搬メカニズムについて、2つの具体的を用い説明する。
上部絶縁層を成膜した際には、圧縮方向の応力が作用する。このため、上部絶縁層の膜質とともに、基板100の変形抑制という観点からも成膜条件を規定することが望ましい。これについて、図19および図20を用い説明する。
図19(b)のデータについて、サンプルごとに説明する。
図20(a)の評価結果は、各サンプル1~3を用い作製したTFTのVds=4.1[V]における電気特性(Id-Vg)の評価結果である。
次に、SiNの成膜による応力、特に圧縮方向の応力が大きくなった場合には、基板を中央部凸の状態に反らせてしまう力が大きくなってしまう。このような形態の基板の反りは、基板搬送時における搬送不良や基板の損傷といったような原因となることが考えられる。より具体的には、例えば、リソグラフィやウェットエッチング、剥離洗浄装置などにおいてローラコンベヤを用い基板搬送を行う場合には、基板の端がローラに引っかかってしまうという不具合を生じることがある。場合によっては、基板が割れてしまうこともあり得る。
上記実施の形態1,2,5では、3層構成のパッシベーション層116,316,816、上記実施の形態3では、5層構成のパッシベーション層516、上記実施の形態4では、4層構成のパッシベーション層716を採用したが、6層以上の積層構成のパッシベーション層を採用することもできる。ただし、AlOxなどからなるバリア層の上下を、SiO、SiN、あるいはSiONからなる絶縁層で挟んだ構成を備えることが必要となる。また、パッシベーション層の形成時間を考慮して、上記実施の形態1などのように層厚を1000[nm]以下(より好ましくは600[nm]以下)とすることが生産効率という観点から望ましい。
10,30,50,70,80.表示パネル
10a.サブピクセル
20.駆動・制御部
21~24.駆動回路
25.制御回路
100,130.基板
101,102,802.ゲート電極
103,1030.ゲート絶縁層
104,105.チャネル層
106,1060.チャネル保護層
107,110,810.ソース電極
108、109,809.ドレイン電極
111,115,815.ソース下部電極
112,114,814.ドレイン下部電極
113.コンタクトプラグ
116,316,516,716,816,826.パッシベーション層
117,317,517,717,817,837.上部電極
118,318,331,518,718,838.層間絶縁層
119,319,519,719.アノード
120.ホール注入層
121.バンク
122.ホール輸送層
123.発光層
124.電子輸送層
125.カソード
126.封止層
127.接合層
128.カラーフィルタ層
129.遮光層
827.ITO層
1161,3161,5161,7161,8161,8261,11610.下部絶縁層
1162,3162,5162,7162,8162,8262,11620.バリア層
1163,3163,5163,5164,5165,7163,7164,8163,8263,8264,11630.上部絶縁層
EL.EL素子部
Tr1.駆動トランジスタ素子部
Tr2.スイッチングトランジスタ素子部
C.容量
Claims (28)
- 基板と、
前記基板の上方に形成されたゲート電極と、
前記基板の上方であって、前記ゲート電極に対して間隔をあけ、且つ、互いの間に間隔をあけて設けられたソース電極およびドレイン電極と、
前記ゲート電極と前記ソース電極および前記ドレイン電極との間に挿設されたチャネル層と、
前記ゲート電極、および前記ソース電極、および前記ドレイン電極、および前記チャネル層の上方を覆うように設けられ、一部に層厚方向に挿通する孔が開設されてなるパッシベーション層と、
を備え、
前記チャネル層は、酸化物半導体材料からなり、
前記パッシベーション層は、前記基板の側から第1層、第2層、および第3層を含む積層構成を有し、
前記パッシベーション層の前記第1層は、酸化シリコン、窒化シリコン、酸窒化シリコンの何れかからなり、
前記パッシベーション層の前記第2層は、アルミニウムの化合物からなり、
前記パッシベーション層の前記第3層は、酸化シリコン、窒化シリコン、酸窒化シリコンの何れかからなる
ことを特徴とする薄膜トランジスタ装置。 - 前記パッシベーション層の前記第1層は、前記ゲート電極または前記ソース電極または前記ドレイン電極の何れかの電極に接している
請求項1記載の薄膜トランジスタ装置。 - 前記パッシベーション層には、酸化シリコン、窒化シリコン、酸窒化シリコンの何れかからなり、前記第3層上に積層された第4層が積層構成中に更に含まれ、
前記パッシベーション層に開設された前記孔には、内壁に沿って導電層が形成されており、
前記導電層は、前記パッシベーション層に開設された前記孔を介して、その一部が前記何れかの電極に電気的に接続されている
請求項1または請求項2記載の薄膜トランジスタ装置。 - 前記パッシベーション層の前記第3層および前記第4層は、ともに窒化シリコンからなり、
前記第4層の窒化シリコンの密度は、前記第3層の窒化シリコンの密度よりも低い
請求項3記載の薄膜トランジスタ装置。 - 前記ソース電極および前記ドレイン電極の少なくとも一方は、銅またはその合金材料を含み、
前記パッシベーション層の前記第4層は、窒化シリコンまたは酸窒化シリコンからなるとともに、その層厚が200nm以上であり、
前記パッシベーション層の前記第3層は、酸化シリコンからなるとともに、その層厚が100nm以上である
請求項3記載の薄膜トランジスタ装置。 - 前記パッシベーション層には、酸化シリコン、窒化シリコン、酸窒化シリコンの何れかからなり、前記第3層上に積層された第4層と、酸化シリコン、窒化シリコン、酸窒化シリコンの何れかからなり、前記第4層上に積層された第5層とが積層構成中に更に含まれ、
前記パッシベーション層に開設された前記孔には、内壁に沿って導電層が形成されており、
前記導電層は、前記パッシベーション層に開設された前記孔を介して、その一部が前記ゲート電極または前記ソース電極または前記ドレイン電極に電気的に接続されており、一部が前記第4層と前記第5層との間に介挿されている
請求項1または請求項2記載の薄膜トランジスタ装置。 - 前記パッシベーション層の前記第1層は、前記ゲート電極または前記ソース電極または前記ドレイン電極の何れかの電極に対して、間に層間絶縁層を介して形成されている
請求項1記載の薄膜トランジスタ装置。 - 前記層間絶縁層には、前記パッシベーション層に開設された前記孔に対して連通する孔が開設されており、
前記層間絶縁層に開設された前記孔には、内壁に沿って導電層が形成されており、
前記導電層は、前記層間絶縁層に開設された前記孔を介して、その一部が前記何れかの電極に電気的に接続されており、一部が前記層間絶縁層と前記第1層との間に介挿されている
請求項7記載の薄膜トランジスタ装置。 - 前記パッシベーション層の前記第2層は、酸化アルミニウムからなる
請求項1から請求項8の何れか記載の薄膜トランジスタ装置。 - 前記パッシベーション層の前記第1層は、酸化シリコンからなる
請求項1から請求項9の何れか記載の薄膜トランジスタ装置。 - 前記パッシベーション層の層厚は、600nm以下である
請求項1から請求項10の何れか記載の薄膜トランジスタ装置。 - 前記ソース電極および前記ドレイン電極の少なくとも一方は、銅またはその合金材料を含み、
前記パッシベーション層の前記第1層は、酸化シリコンからなるとともに、その層厚が200nm以上である
請求項1または請求項2記載の薄膜トランジスタ装置。 - 請求項1から請求項12の何れか記載の薄膜トランジスタ装置を備える
ことを特徴とする表示装置。 - 前記基板の表面に沿って形成された複数の発光部を有し、
前記複数の発光部の各々は、アノードおよびカソードと、前記アノードと前記カソードとの間に介挿された有機発光層とを有する
請求項13記載の表示装置。 - 基板の上方にゲート電極を形成し、
前記ゲート電極の上方にチャネル層を形成し、
前記チャネル層上に、互いの間に間隔をあけた状態でソース電極およびドレイン電極を形成し、
前記チャネル層、および前記ゲート電極、および前記ソース電極、および前記ドレイン電極の上方を覆い、一部に層厚方向に挿通する孔が開設されてなるパッシベーション層を形成し、
前記チャネル層を形成する過程では、酸化物半導体材料を用いて前記チャネル層を形成し、
前記パッシベーション層を形成する過程では、
酸化シリコン、窒化シリコン、酸窒化シリコンの何れかの材料を用い、前記チャネル層、および前記ゲート電極、および前記ソース電極、および前記ドレイン電極の上方を覆う第1準備膜を成膜し、
アルミニウムの化合物を用い、前記第1準備膜上に第2準備膜を成膜し、
酸化シリコン、窒化シリコン、酸窒化シリコンの何れかの材料を用い、前記第2準備膜上に第3準備膜を成膜し、
前記第3準備膜における前記パッシベーション層の前記孔に相当する箇所に対し、ドライエッチング法を用いて当該第3準備膜を膜厚方向に挿通する孔を開設し、一部に孔が開設されてなる第3層を形成し、
前記第3層の前記孔の底部から露出する前記第2準備膜の表面に対し、ウェットエッチング法を用いて当該第2準備膜を膜厚方向に挿通する孔を開設し、一部に孔が開設されてなる第2層を形成し、
前記第2層の前記孔の底部から露出する前記第1準備膜の表面に対し、ドライエッチング法を用いて当該第1準備膜を膜厚方向に挿通する孔を開設し、一部に孔が開設されてなる第1層を形成する
ことを特徴とする薄膜トランジスタ装置の製造方法。 - 前記第1準備膜を成膜する過程では、プラズマCVD法またはスパッタリング法により前記第1準備膜を成膜した後、ドライエア、あるいは酸素雰囲気中でアニール処理を施す
請求項13記載の薄膜トランジスタ装置の製造方法。 - 前記第2準備膜を成膜する過程では、酸化アルミニウムからなる前記第2準備膜を成膜する
請求項15または請求項16記載の薄膜トランジスタ装置の製造方法。 - 前記第2準備膜を成膜する過程では、10nm以上100nm以下の範囲内の膜厚で前記第2準備膜を成膜する
請求項15から請求項18の何れか記載の薄膜トランジスタ装置の製造方法。 - 前記パッシベーション層を形成する過程では、600nm以下の層厚で前記パッシベーション層を形成する
請求項15から請求項18の何れか記載の薄膜トランジスタ装置の製造方法。 - 前記ソース電極および前記ドレイン電極の形成では、銅またはその合金を用い、前記ソース電極および前記ドレイン電極の少なくとも一方を形成し、
前記パッシベーション層の前記第3準備膜を形成した後に300℃以下の温度でアニール処理を施す
請求項15記載の薄膜トランジスタ装置の製造方法。 - 前記第1準備膜の成膜では、230℃以下の温度で酸化シリコンからなる前記第1準備膜を成膜する
請求項15記載の薄膜トランジスタ装置の製造方法。 - 前記第1準備膜の成膜では、SiH4とN2Oとの混合ガスであって、Ar希釈を行わないガスを用い、
SiH4の流量を、SiH4/(SiH4+N2O)<1.1%の条件を満足する流量とする
請求項21記載の薄膜トランジスタ装置の製造方法。 - 前記第1準備膜の成膜では、200nm以上の膜厚で前記第1準備膜を成膜する
請求項21または請求項22記載の薄膜トランジスタ装置の製造方法。 - 前記第1準備膜の成膜では、600nm以下の膜厚で前記第1準備膜を成膜する
請求項21から請求項23の何れか記載の薄膜トランジスタ装置の製造方法。 - 前記第2準備膜を成膜した後であって、前記第3準備膜を成膜する前に、前記第2準備膜および前記第3準備膜の双方に接し、酸化シリコンからなる第4準備膜を成膜し、
前記第3準備膜の成膜では、窒化シリコンまたは酸窒化シリコンからなる前記第3準備膜を成膜し、
前記第4準備膜の成膜では、100nm以上の膜厚で前記第4準備膜を成膜し、
前記第3準備膜の成膜では、200nm以上の膜厚で前記第3準備膜を成膜する
請求項21から請求項24の何れか記載の薄膜トランジスタ装置の製造方法。 - 前記第3準備膜の成膜および前記第4準備膜の成膜は、290℃以上300℃未満の温度で行う
請求項21から請求項25の何れか記載の薄膜トランジスタ装置の製造方法。 - 前記第3準備膜の成膜では、SiH/NH≦0.10の関係を満たす窒化シリコンからなる前記第3準備膜を成膜する
請求項21から請求項26の何れか記載の薄膜トランジスタ装置の製造方法。 - 前記第3準備膜の成膜では、応力の絶対値が150MPa以下となるように、窒化シリコンからなる前記第3準備膜を成膜する
請求項21から請求項27の何れか記載の薄膜トランジスタ装置の製造方法。
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JP6057106B2 (ja) | 2017-01-11 |
JPWO2014192221A1 (ja) | 2017-02-23 |
US20160133650A1 (en) | 2016-05-12 |
US9893088B2 (en) | 2018-02-13 |
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