WO2013105537A1 - 半導体装置、表示装置、ならびに半導体装置の製造方法 - Google Patents
半導体装置、表示装置、ならびに半導体装置の製造方法 Download PDFInfo
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- WO2013105537A1 WO2013105537A1 PCT/JP2013/050064 JP2013050064W WO2013105537A1 WO 2013105537 A1 WO2013105537 A1 WO 2013105537A1 JP 2013050064 W JP2013050064 W JP 2013050064W WO 2013105537 A1 WO2013105537 A1 WO 2013105537A1
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/1259—Multistep manufacturing methods
- H01L27/127—Multistep manufacturing methods with a particular formation, treatment or patterning of the active layer specially adapted to the circuit arrangement
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- 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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
- G02F1/134336—Matrix
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- 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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1345—Conductors connecting electrodes to cell terminals
- G02F1/13458—Terminal pads
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
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- H—ELECTRICITY
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- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/1222—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition, shape or crystalline structure of the active layer
- H01L27/1225—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition, shape or crystalline structure of the active layer with semiconductor materials not belonging to the group IV of the periodic table, e.g. InGaZnO
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/124—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/1259—Multistep manufacturing methods
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/36—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the electrodes
- H01L33/40—Materials therefor
- H01L33/42—Transparent materials
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- 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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
- G02F1/134372—Electrodes characterised by their geometrical arrangement for fringe field switching [FFS] where the common electrode is not patterned
Definitions
- the present invention relates to a semiconductor device and a display device including a thin film transistor, and a method for manufacturing a semiconductor device including a thin film transistor.
- An active matrix liquid crystal display device generally includes a substrate (hereinafter referred to as “TFT substrate”) on which a thin film transistor (hereinafter also referred to as “TFT”) is formed as a switching element for each pixel, and a counter electrode. And a counter substrate on which a color filter and the like are formed, a liquid crystal layer provided between the TFT substrate and the counter substrate, and a pair of electrodes for applying a voltage to the liquid crystal layer.
- TFT substrate a substrate
- TFT substrate a thin film transistor
- the TFT substrate includes a plurality of source wirings, a plurality of gate wirings, a plurality of TFTs disposed at intersections thereof, a pixel electrode for applying a voltage to a light modulation layer such as a liquid crystal layer, and an auxiliary Capacitance wiring, auxiliary capacitance electrodes, and the like are formed.
- terminal portions for connecting the source wiring and the gate wiring to the input terminals of the driving circuit are provided at the ends of the TFT substrate.
- the drive circuit may be formed on the TFT substrate or may be formed on a separate substrate (circuit substrate).
- TN Transmission Nematic
- VA Very Alignment
- IPS In-Plane-Switching
- FFS Ringe Field Switching
- the TN mode and the VA mode are longitudinal electric field mode in which an electric field is applied to liquid crystal molecules by a pair of electrodes arranged with a liquid crystal layer interposed therebetween.
- the IPS mode or the FFS mode is a lateral electric field mode in which a pair of electrodes is provided on one substrate and an electric field is applied to liquid crystal molecules in a direction (lateral direction) parallel to the substrate surface.
- the horizontal electric field method has an advantage that a wider viewing angle can be realized than the vertical electric field method because liquid crystal molecules do not rise from the substrate.
- the IPS mode liquid crystal display device among the operation modes of the lateral electric field method, a pair of comb electrodes are formed on the TFT substrate by patterning a metal film. For this reason, there exists a problem that the transmittance
- the aperture ratio and the transmittance can be improved by making the electrodes formed on the TFT substrate transparent.
- FFS mode liquid crystal display devices are disclosed in, for example, Patent Document 1 and Patent Document 2.
- a common electrode and a pixel electrode are provided above the TFT via an insulating film.
- slit-like openings are formed in electrodes (for example, pixel electrodes) located on the liquid crystal layer side.
- an electric field expressed by electric lines of force that exit from the pixel electrode, pass through the liquid crystal layer, pass through the slit-shaped opening, and exit to the common electrode is generated.
- This electric field has a component transverse to the liquid crystal layer. As a result, a horizontal electric field can be applied to the liquid crystal layer.
- Patent Document 3 discloses an active matrix liquid crystal display device using an oxide semiconductor TFT as a switching element.
- each of the two layers of electrodes is made of a transparent conductive film.
- the aperture ratio and the transmittance is possible to increase the aperture ratio and the transmittance as compared with the TFT substrate used in the IPS mode liquid crystal display device.
- the oxide semiconductor TFT the size of the transistor portion in the TFT substrate can be reduced, so that the transmittance can be further improved.
- the present invention has been made in view of the above, and an object thereof is to improve the reliability of a semiconductor device such as a TFT substrate or a display device using such a semiconductor device.
- a semiconductor device includes a substrate, a thin film transistor supported by the substrate, a gate wiring layer, a source wiring layer, and a terminal portion.
- the gate wiring layer includes a gate wiring and a gate electrode of the thin film transistor.
- a lower conductive layer of the terminal portion, the source wiring layer includes a source wiring, a source electrode and a drain electrode of the thin film transistor, and the thin film transistor is disposed on the gate electrode and the gate electrode.
- a transparent connection layer, and the gate insulating layer and the second semiconductor layer are connected to each other.
- the side surface of the gate insulating layer on the contact hole side and the side surface of the second semiconductor layer on the contact hole side are aligned, and the lower transparent connection layer is formed in the contact hole and in the contact hole.
- the upper transparent connection layer is in contact with the lower transparent connection layer on the bottom and side walls of the contact hole.
- a side surface of the lower transparent connection layer is aligned with a side surface of the second semiconductor layer opposite to the contact hole.
- an end portion of the upper transparent connection layer is on the lower transparent connection layer.
- the upper transparent connection layer covers a side surface of the second semiconductor layer opposite to the contact hole.
- a second dielectric layer formed of the same dielectric film as the first dielectric layer is further provided between the upper transparent connection layer and the lower transparent connection layer.
- the second dielectric layer covers a side surface of the semiconductor layer opposite to the contact hole.
- a display device includes the above-described semiconductor device, a counter substrate disposed so as to face the semiconductor device, and a liquid crystal layer disposed between the counter substrate and the semiconductor device.
- the second transparent conductive layer is separated for each pixel and functions as a pixel electrode.
- the second transparent conductive layer has a plurality of slit-shaped openings in a pixel, and the first transparent conductive layer exists at least under the plurality of openings, and is a common electrode. Function as.
- a method of manufacturing a semiconductor device is a method of manufacturing a semiconductor device including a thin film transistor and a terminal portion, and (a) a gate wiring layer including a lower conductive layer, a gate wiring, and a gate electrode on a substrate And (b) forming a gate insulating layer covering the gate wiring layer; and (c) forming an oxide semiconductor film on the gate insulating layer and patterning the oxide semiconductor film. Forming a first semiconductor layer having a portion overlapping the gate electrode and a second semiconductor layer having a first opening above the lower conductive layer; and (d) a channel region of the first semiconductor layer.
- the step (g) includes a step of forming a transparent conductive film in the contact hole and on the second semiconductor layer, and a step of simultaneously etching the transparent conductive film and the second semiconductor layer.
- the method further includes a step of forming a dielectric layer on a part of the lower transparent conductive layer between the step (g) and the step (f).
- the upper transparent connection layer is formed in contact with the lower transparent conductive layer and the dielectric layer.
- a semiconductor device is a semiconductor device including a substrate and a terminal portion supported by the substrate, and the terminal portion includes a lower conductive layer formed on the substrate, An insulating layer covering the lower conductive layer; a semiconductor layer including an oxide semiconductor formed on the insulating layer; the lower transparent connecting layer; and a transparent upper transparent connecting layer disposed on the lower transparent connecting layer;
- the insulating layer and the semiconductor layer have a contact hole, and the side surface of the insulating layer on the contact hole side is aligned with the side surface of the semiconductor layer on the contact hole side, and the lower transparent connection
- the layer is formed in the contact hole and on the semiconductor layer, and is in contact with the lower conductive layer in the contact hole, and the upper transparent connection layer is formed on a bottom surface and a side of the contact hole. In is in contact with the lower transparent connecting layer.
- the oxide semiconductor includes an In—Ga—Zn—O-based semiconductor.
- a method of manufacturing a semiconductor device is a method of manufacturing a semiconductor device including a terminal portion, and includes (A) a step of forming a lower conductive layer on a substrate, and (B) the lower conductive layer. Forming an insulating layer covering the layer; (C) forming a semiconductor layer including an oxide semiconductor having a first opening above the lower conductive layer on the insulating layer; and (D).
- the oxide semiconductor includes an In—Ga—Zn—O-based semiconductor.
- a TFT, a first transparent conductive layer formed on the TFT, and a second transparent conductive layer formed on the first transparent conductive layer via a dielectric layer are provided.
- a terminal having a redundant structure is formed using the first and second transparent conductive layers. Therefore, the reliability of the terminal portion can be increased.
- the semiconductor device having the terminal portion as described above can be efficiently manufactured without increasing the number of masks.
- FIG. 6C is a cross-sectional view illustrating another example of the terminal portion 102.
- A) And (b) is the top view and sectional drawing of TFT101 and contact part 105 (1) in Embodiment 1 by this invention, respectively.
- A) And (b) is the top view and sectional drawing which show the other contact part 105 (2) in Embodiment 1 of this invention, respectively.
- FIG. 7 is a plan view showing a part of an SG connection part forming region 103R in Embodiment 1 according to the present invention.
- FIG. FIG. 6 is a cross-sectional view showing a part of an SG connection part forming region 103R in Embodiment 1 according to the present invention.
- 3 is a diagram illustrating a flow of a method for manufacturing the semiconductor device 100.
- FIG. 7A to 7C are process plan views for explaining the method for manufacturing the semiconductor device according to the first embodiment of the present invention.
- (A)-(c) is process sectional drawing for demonstrating the manufacturing method of the semiconductor device of Embodiment 1 by this invention, respectively.
- (D) to (f) are process plan views for explaining the method for manufacturing the semiconductor device according to the first embodiment of the present invention.
- (D) to (f) are process cross-sectional views for explaining the method of manufacturing the semiconductor device according to the first embodiment of the present invention.
- G) And (h) is a process top view for demonstrating the manufacturing method of the semiconductor device of Embodiment 1 by this invention, respectively.
- (G) And (h) is process sectional drawing for demonstrating the manufacturing method of the semiconductor device of Embodiment 1 by this invention, respectively.
- (A)-(e) is process sectional drawing for demonstrating the manufacturing method of the semiconductor device of Embodiment 2 by this invention, respectively.
- (F) to (i) are process cross-sectional views for explaining the method of manufacturing the semiconductor device according to the second embodiment of the present invention.
- (J) to (m) are process cross-sectional views for explaining the method of manufacturing the semiconductor device according to the second embodiment of the present invention.
- (N) to (p) are process cross-sectional views for explaining the method of manufacturing the semiconductor device according to the second embodiment of the present invention.
- (A) And (b) is the top view and sectional drawing which respectively show the terminal part 202 formed in the peripheral region of the TFT substrate of Embodiment 3 by this invention.
- (A) And (b) is process sectional drawing for demonstrating the manufacturing method of the semiconductor device of Embodiment 3 by this invention, respectively.
- (A)-(c) is process sectional drawing for demonstrating the manufacturing method of the semiconductor device of Embodiment 4 by this invention, respectively.
- Embodiment 1 of the semiconductor device according to the present invention is a TFT substrate used in an active matrix type liquid crystal display device.
- a TFT substrate used for a display device in the FFS mode will be described as an example.
- the semiconductor device of the present embodiment only needs to have a TFT and two transparent conductive layers on the substrate.
- the liquid crystal display device in other operation modes, various display devices other than the liquid crystal display device, and electronic equipment A wide range of TFT substrates used for the above are included.
- FIG. 1 is a diagram schematically showing an example of a planar structure of a semiconductor device (TFT substrate) 100 according to the present embodiment.
- the semiconductor device 100 includes a display area (active area) 120 that contributes to display, and a peripheral area (frame area) 110 located outside the active area 120.
- a plurality of gate lines G and a plurality of source lines S are formed in the display area 120, and each area surrounded by these lines is a “pixel”. As shown in the figure, the plurality of pixels are arranged in a matrix. A pixel electrode (not shown) is formed in each pixel. Although not shown, in each pixel, a thin film transistor (TFT), which is an active element, is formed near each intersection of the plurality of source lines S and the plurality of gate lines G. Each TFT is electrically connected to the pixel electrode by a contact portion. In this specification, a region in which the TFT and the contact portion are formed is referred to as a “transistor formation region 101R”. In the present embodiment, a common electrode (not shown) facing the pixel electrode via a dielectric layer (insulating layer) is provided below the pixel electrode. A common signal (COM signal) is applied to the common electrode.
- COM signal common signal
- a terminal portion 102 for electrically connecting the gate wiring G or the source wiring S and the external wiring is formed. Further, between each source wiring S and the terminal portion 102, an SG connecting portion (connection from the source wiring S to the gate wiring G is connected) connected to a connection wiring formed of the same conductive film as the gate wiring G. Part) 103 may be formed. In that case, the connection wiring is connected to the external wiring at the terminal portion 102.
- a region where a plurality of terminal portions 102 are formed is referred to as a “terminal portion forming region 102R”, and a region where the SG connection portion 103 is formed is referred to as an “SG connection portion forming region 103R”.
- the COM signal lines S COM and G COM for applying a COM signal to the common electrode and the COM-G connection for connecting the common electrode and the COM signal line G COM to the peripheral region 110 are illustrated.
- Part (not shown), and a COM-S connection part (not shown) for connecting the common electrode and the COM signal line SCOM are formed.
- the COM signal lines S COM and G COM are provided in a ring shape so as to surround the display area 120, but the planar shape of the COM signal lines S COM and G COM is not particularly limited.
- the COM signal wiring S COM extending in parallel to the source wiring S is formed of the same conductive film as the source wiring S
- the COM signal wiring G COM extending in parallel to the gate wiring G is the same as the gate wiring G. It is formed from a conductive film.
- These COM signal lines S COM and G COM are electrically connected to each other in the vicinity of each corner of the display area 120 in the peripheral area 110, for example.
- the conductive film for forming the COM signal wiring is not limited to the above.
- the entire COM signal wiring may be formed of the same conductive film as the gate wiring G or the same conductive film as the source wiring S.
- the COM-G connection part for connecting the COM signal line GCOM and the common electrode is arranged in the peripheral region 110 so as not to overlap the SG connection part 103 between the adjacent source lines S. May be.
- a region where the COM-G connection portion is formed is referred to as a “COM-G connection portion formation region 104R”.
- a COM-S connection part for connecting the COM signal line SCOM and the common electrode may be arranged in the peripheral region 110.
- the counter electrode may not be a common electrode depending on the operation mode of the display device to which the semiconductor device 100 is applied.
- the COM signal wiring and the COM-G connection portion may not be formed in the peripheral region 110.
- the transparent conductive layer disposed opposite to the pixel electrode through the dielectric layer does not have to function as an electrode. Good.
- 2A and 2B are a plan view and a cross-sectional view showing a terminal portion formed in the peripheral region of the TFT substrate, respectively.
- FIG. 2B two adjacent terminals are illustrated, but the number of terminals is not particularly limited.
- the terminal portion 102 includes a lower conductive layer 3t disposed on the substrate 1, a gate insulating layer 5 extending so as to cover the lower conductive layer 3t, and an oxide semiconductor formed on the gate insulating layer 5. And a semiconductor layer 7t.
- a contact hole CH exposing a part of the lower conductive layer 3t (which reaches the lower conductive layer 3t) is formed.
- the contact hole CH is constituted by the opening 5q of the gate insulating layer 5 and the opening 7q of the semiconductor layer 7t.
- the side surface of the opening 5q of the gate insulating layer 5 (side surface on the contact hole CH side) is aligned with the side surface of the opening 7q of the semiconductor layer 7t (side surface on the contact hole CH side).
- a lower transparent connection layer 15t is formed on the semiconductor layer 7t and in the contact hole CH.
- the lower transparent connection layer 15t is in contact with the lower conductive layer 3t in the contact hole CH.
- An upper transparent connection layer 19t is formed on the lower transparent connection layer 15t.
- the upper transparent connection layer 19t is in contact with the lower transparent connection layer 15t on the bottom and side surfaces of the contact hole CH. In the terminal portion 102, electrical connection between the upper transparent connection layer 19t and the lower conductive layer 3t is ensured through the lower transparent connection layer 15t.
- the lower conductive layer 3t is formed of the same conductive film as the gate wiring 3, for example.
- the lower conductive layer 3t may be connected to the gate wiring 3 (gate terminal portion). Alternatively, it may be connected to the source wiring 11 via the SG connection part (source terminal part).
- the terminal portion 102 of the present embodiment has a redundant structure including a lower transparent connection layer 15t and an upper transparent connection layer 19t. For this reason, since the increase in resistance due to the disconnection of the conductive film formed in the recess made of the gate insulating layer 5 and the semiconductor layer 7t can be suppressed, the reliability can be improved as compared with the prior art. Further, according to the present embodiment, as described later, since the semiconductor layer 7t can be used as an etching mask in the step of forming the opening 5q in the gate insulating layer 5, the manufacturing process is not complicated and the redundant structure is provided. The terminal part 102 can be manufactured.
- the lower transparent connection layer 15t is formed from the same transparent conductive film as the common electrode
- the upper transparent connection layer 19t is formed from the same conductive film as the pixel electrode. It is preferable to form. As described above, by using the pair of electrode layers that become the common electrode and the pixel electrode, the terminal portion 102 having a redundant structure can be formed while suppressing an increase in the number of manufacturing steps and the number of masks.
- the semiconductor layer 7t, the upper transparent connection layer 19t, and the lower transparent connection layer 15t are preferably overlapped. That is, it is preferable that the upper transparent connection layer 19t also covers a portion of the lower transparent connection layer 15t located above the semiconductor layer 7t. Thereby, the increase in resistance due to step breakage can be more reliably suppressed.
- the end 19e of the upper transparent connection layer 19t is on the lower transparent connection layer 15t, but the upper transparent connection layer 19t covers the entire upper surface of the lower transparent connection layer 15t. It may be covered.
- the upper transparent connection layer 19t not only covers the entire upper surface of the lower transparent connection layer 15t, but also on the opposite side of the opening 7q of the lower transparent connection layer 15t and the semiconductor layer 7t. You may cover to the side.
- the side surface of the semiconductor layer 7t on the opening 7q side is aligned with the side surface of the gate insulating layer 5 on the opening 5q side.
- Such a configuration can be obtained by forming an opening 5q in the gate insulating layer 5 using the semiconductor layer 7t as an etching mask, as will be described later. Further, the side surface of the semiconductor layer 7t opposite to the opening 7q may be aligned with the side surface of the lower transparent connection layer 15t. Such a configuration can be obtained by simultaneously etching the semiconductor layer 7t and the lower transparent connection layer 15t.
- the side surfaces of two or more different layers are aligned does not only mean that the side surfaces of these layers are flush with each other, but the side surfaces of these layers are continuously tapered. This includes the case of forming an inclined surface such as a shape. Such a configuration can be obtained by etching these layers using the same mask.
- the semiconductor device 100 of this embodiment includes a TFT 101 for each pixel, and a contact portion 105 (1) that connects the TFT 101 and the pixel electrode.
- the contact portion 105 (1) is also provided in the transistor formation region 101R.
- FIGS. 3A and 3B are a plan view and a cross-sectional view, respectively, of the TFT 101 and the contact portion 105 (1) in the present embodiment.
- a surface (tapered portion or the like) inclined with respect to the substrate 1 is indicated by a step-like line, but in reality, it is a smooth inclined surface. The same applies to other sectional views of the present application.
- the semiconductor device 100 of this embodiment has a TFT 101 for each pixel and a contact portion 105 (1) for connecting the TFT 101 and the pixel electrode.
- the contact portion 105 (1) is also provided in the transistor formation region 101R.
- the TFT 101, the insulating layer 14 covering the TFT 101, the drain connected transparent conductive layer 15a disposed above the insulating layer 14 and not electrically connected to the first transparent conductive layer 15, and the first A second transparent conductive layer 19 a is formed on the transparent conductive layer 15 via a dielectric layer (insulating layer) 17. Further, the drain electrode 11d of the TFT 101 and the second transparent conductive layer 19a are electrically connected in the first contact hole CH1 formed in the interlayer insulating layer 14 and the dielectric layer 17.
- the insulating layer 14 formed between the first transparent conductive layer 15 and the TFT 101 is referred to as an “interlayer insulating layer”, and is formed between the first transparent conductive layer 15 and the second transparent conductive layer 19a.
- An insulating layer that forms a capacitance with the conductive layers 15 and 19a is referred to as a “dielectric layer”.
- the interlayer insulating layer 14 in this embodiment includes a first insulating layer 12 formed in contact with the drain electrode 11d of the TFT 101 and a second insulating layer 13 formed thereon.
- the TFT 101 includes a gate electrode 3a, a gate insulating layer 5 formed on the gate electrode 3a, a semiconductor layer 7a formed on the gate insulating layer 5, and a source electrode formed in contact with the semiconductor layer 7a. 11s and a drain electrode 11d.
- a gate electrode 3a When viewed from the normal direction of the substrate 1, at least a portion that becomes a channel region in the semiconductor layer 7 a is disposed so as to overlap the gate electrode 3 a with the gate insulating layer 5 interposed therebetween.
- a protective layer 9 is formed so as to cover at least a region to be a channel region in the semiconductor layer 7a.
- the source and drain electrodes 11 s and 11 d may be in contact with the semiconductor layer 7 a in the opening provided in the protective layer 9.
- the gate electrode 3 a is formed integrally with the gate wiring 3 using the same conductive film as the gate wiring 3.
- the gate wiring layer includes the gate wiring 3 and the gate electrode 3a.
- the gate wiring 3 includes a portion that functions as the gate of the TFT 101, and this portion becomes the gate electrode 3a described above.
- a pattern in which the gate electrode 3a and the gate wiring 3 are integrally formed may be referred to as “gate wiring 3”.
- the gate wiring 3 When the gate wiring 3 is viewed from the normal direction of the substrate 1, the gate wiring 3 has a portion extending in a predetermined direction and an extending portion extending from the portion in a direction different from the predetermined direction. The portion may function as the gate electrode 3a.
- the gate wiring 3 when viewed from the normal direction of the substrate 1, the gate wiring 3 has a plurality of straight portions extending in a predetermined direction with a constant width, and a part of each straight portion overlaps the channel region of the TFT 101. It may function as the gate electrode 3a.
- the source electrode 11 s and the drain electrode 11 d are formed of the same conductive film as the source wiring 11.
- the source wiring layer includes the source wiring 11, the source electrode 11s, and the drain electrode 11d.
- the source electrode 11 s is electrically connected to the source wiring 11.
- the source wiring 11 may have a portion extending in a predetermined direction and an extending portion extending from the portion in a direction different from the predetermined direction, and the extending portion may function as the source electrode 11s.
- the interlayer insulating layer 14 and the dielectric layer 17 have a first contact hole CH1 reaching the surface of the drain electrode 11d of the TFT 101 (exposing the drain electrode 11d).
- the drain electrode 11d of the TFT 101 and the second transparent conductive layer 19a are electrically connected.
- a part of the surface of the drain electrode 11d is in contact with the drain connection transparent conductive layer 15a, and the other part is in contact with the second transparent conductive layer 19a.
- the second transparent conductive layer 19a and the drain electrode 11d may be connected via a drain connection transparent conductive layer 15a.
- a portion where the drain electrode 11d of the TFT 101 is in contact with the transparent conductive layer (in this example, the drain connection transparent conductive layer 15a and the second transparent conductive layer 19a) formed thereabove is referred to as a “contact portion”.
- the gate insulating layer 5 may have a stacked structure of a first gate insulating layer 5A and a second gate insulating layer 5B formed thereon.
- the first insulating layer 12 located on the TFT 101 side in the interlayer insulating layer 14 is, for example, an inorganic insulating layer, and is formed in contact with a part of the drain electrode 11d.
- the first insulating layer 12 functions as a passivation layer.
- the second insulating layer 13 formed on the first insulating layer 12 may be an organic insulating film.
- the interlayer insulating layer 14 has a two-layer structure, but may have a single-layer structure including only the first insulating layer 12 or may have a stacked structure of three or more layers.
- the first transparent conductive layer 15 functions as a common electrode, for example.
- the first transparent conductive layer 15 has an opening 15p.
- the drain connection transparent conductive layer 15 a is formed of the same conductive film as the first transparent conductive layer 15, but is not electrically connected to the first transparent conductive layer 15.
- the second transparent conductive layer 19a functions as a pixel electrode, for example.
- the second transparent conductive layer 19a is separated for each pixel. Moreover, it has a plurality of slit-shaped openings.
- the second transparent conductive layer 19 a When viewed from the normal direction of the substrate 1, at least a part of the second transparent conductive layer 19 a is disposed so as to overlap the first transparent conductive layer 15 with the dielectric layer 17 interposed therebetween. For this reason, a capacitance is formed in the overlapping portion of these conductive layers 15 and 19a. This capacity can function as an auxiliary capacity in the display device.
- the contact portion 105 (1) When viewed from the normal direction of the substrate 1, at least a part of the contact portion 105 (1) is arranged so as to overlap with the gate wiring layer (here, the gate wiring 3 or the gate electrode 3a).
- the first contact hole CH ⁇ b> 1 is configured by openings of the first transparent conductive layer 15, the dielectric layer 17, the second insulating layer 13, and the first insulating layer 12.
- FIG. 3A examples of the outlines of the openings of the first transparent conductive layer 15, the dielectric layer 17, the second insulating layer 13, and the first insulating layer 12 are shown by lines 15p, 17p, 13p, and 12p, respectively. Show.
- the opening is formed.
- the contour at the depth at which the portion is the smallest is defined as “the contour of the opening”. Therefore, in FIG. 3A, for example, the outline of the opening 13p of the second insulating layer 13 is the outline at the bottom surface of the second insulating layer 13 (the interface between the second insulating layer 13 and the first insulating layer 12). .
- the openings 17p and 13p are both disposed inside the opening 15p of the first transparent conductive layer 15. Therefore, the first transparent conductive layer 15 is not exposed on the side wall of the first contact hole CH1.
- the opening 12 p of the first insulating layer 12 may be aligned with the opening 13 p of the second insulating layer 13.
- the opening 17p and the opening 13p are arranged so that at least a part thereof overlaps. A portion where these openings 17p and 13p overlap corresponds to the opening 12p of the first insulating layer 12 in contact with the drain electrode 11d.
- the openings 17p and 13p are arranged so that at least a part of the opening 13p of the second insulating layer 13 is located inside the outline of the opening 17p of the dielectric layer 17.
- the entire opening 13p of the second insulating layer 13 is disposed inside the outline of the opening 17p of the dielectric layer 17.
- a drain-connected transparent conductive layer 15a that is electrically separated from the first transparent conductive layer 15 is formed in the opening 15p.
- the drain connection transparent conductive layer 15a covers part of the side surface of the opening 13p, part of the side surface of the opening 12p, and part of the surface of the drain electrode 11d exposed by these openings.
- the second transparent conductive layer 19a includes a drain connection transparent conductive layer 15a, a portion of the surface of the drain electrode 11d and the side of the openings 12p and 13p that are not covered with the drain connection transparent conductive layer 15a, and The side surface of the opening 17p of the dielectric layer 17 is covered.
- the first contact hole CH1 is formed by etching the dielectric layer 17, etching the first insulating layer 12, and patterning the second insulating layer 13.
- the first insulating layer 12 is formed using the second insulating layer 13 as an etching mask. Etching is performed.
- the side surface of the first insulating layer 12 on the opening 12p side is aligned with a part of the side surface of the second insulating layer 13 on the opening 13p side (in the first contact hole CH1 shown in FIG. 3B). .
- the side surfaces of two or more different layers are aligned does not only mean that the side surfaces of these layers are flush with each other, but the side surfaces of these layers are continuously tapered. This includes the case of forming an inclined surface such as a shape. Such a configuration can be obtained by etching these layers using the same mask.
- Such a contact portion 105 (1) is formed by the following method, for example. First, the TFT 101 is formed on the substrate 1. Next, a first insulating layer 12 in contact with at least the drain electrode 11 d of the TFT 101 is formed so as to cover the TFT 101. Next, the second insulating layer 13 having the opening 13 p is formed on the first insulating layer 12. Thereafter, using the second insulating layer 13 as a mask, the first insulating layer 12 is etched to provide an opening 12p. By etching the first insulating layer 12, the surface of the drain electrode 11d is exposed.
- a first transparent conductive layer 15 having an opening 15p and a drain connection transparent conductive layer 15a are formed on the inner side of the opening 15p on the second insulating layer 13.
- the drain connection transparent conductive layer 15a is in contact with a part of the surface of the drain electrode 11d in the opening 12p, and the other part of the surface of the drain electrode 11d is exposed.
- a dielectric layer 17 having an opening 17 p is formed on the first transparent conductive layer 15.
- the openings 12p, 13p, and 17p constitute the first contact hole CH1.
- the second transparent conductive layer 19a is formed on the dielectric layer 17 and in the first contact hole CH1 so as to be in contact with other portions of the surface of the drain electrode 11d.
- the drain electrode 11d and the second transparent conductive layer 19a may not be in direct contact with each other in the first contact hole CH1.
- FIGS. 4A and 4B are a cross-sectional view and a plan view illustrating another TFT and contact portion in this embodiment.
- FIG. 4B shows a cross section taken along the line A-A ′ of FIG.
- Constituent elements common to the TFT 101 and the contact portion 105 (1) shown in FIG. 3 are denoted by the same reference numerals to avoid duplication of description.
- the drain electrode 11d in the first contact hole CH1, the drain electrode 11d is in contact with only the drain connection transparent conductive layer 15a and is not in contact with the second transparent conductive layer 19a. That is, the drain electrode 11d is electrically connected to the second transparent conductive layer 19a through the drain connection transparent conductive layer 15a.
- the contact portion 105 (2) is a portion where the drain electrode 11d and the drain connection transparent conductive layer 15a are in contact with each other.
- the contact portion 105 (2) is disposed so as to overlap with the gate wiring layer (here, the gate wiring 3 or the gate electrode 3 a) when viewed from the normal direction of the substrate 1.
- the opening 17p of the dielectric layer 17 and the openings 12p, 13p of the interlayer insulating layer 14 are arranged so as to partially overlap. Therefore, the dielectric layer 17 is formed on the side surface on the opening side of the interlayer insulating layer 14 so as to cover a part of the drain connection transparent conductive layer 15a.
- a second transparent conductive layer 19a is formed so as to cover the dielectric layer 17 and a portion of the drain connection transparent conductive layer 15a that is not covered with the dielectric layer 17.
- the contact part 105 (2) can be formed as follows, for example. First, the first insulating layer 12 is etched using the second insulating layer 13 as a mask in the same manner as the method for forming the contact portion 105 (1) described above, so that the opening 12p exposing the surface of the drain electrode 11d is formed. Provide. Thereafter, a first transparent conductive layer 15 having an opening 15p and a drain connection transparent conductive layer 15a are formed on the inner side of the opening 15p on the second insulating layer 13. At this time, the drain-connected transparent conductive layer 15a is disposed in contact with the entire surface of the drain electrode 11d in the opening 12p. Thereafter, a dielectric layer 17 having an opening 17 p is formed on the first transparent conductive layer 15.
- the openings 12p, 13p, and 17p constitute the first contact hole CH1. Since a part of the outline of the opening 17p is located inside the outline of the opening 13p, the dielectric layer 17 covers a part of the side of the openings 12p and 13p (the left side in FIG. 4). It is formed. Next, the second transparent conductive layer 19a is formed on the dielectric layer 17 and in the first contact hole CH1 so as to be in contact with the drain-connected transparent conductive layer 15a.
- 5A and 5B are a plan view and a cross-sectional view illustrating still another contact portion 105 (3) in the present embodiment, respectively.
- the contact portion 105 (3) is formed of the same conductive film as the gate wiring 3 and is disposed on the lower conductive layer 3 c that is electrically separated from the gate wiring 3.
- the lower conductive layer 3c may be an auxiliary capacitance wiring, for example.
- An upper conductive layer 11c is formed on the lower conductive layer 3c with a gate insulating layer 5 interposed therebetween.
- the upper conductive layer 11c is formed of the same conductive film as the source wiring 11 and is electrically connected to the drain electrode 11d.
- the upper conductive layer 11c may be formed integrally with the drain electrode 11d.
- an interlayer insulating layer 14 having an opening 14p exposing the upper conductive layer 11c is formed.
- a drain connection transparent conductive layer 15a, a dielectric layer 17 and a second transparent conductive layer 19a are formed in this order.
- An opening 17p is formed in the dielectric layer 17.
- the opening 17p is disposed inside the outline of the opening 14p.
- the second transparent conductive layer 19a is in contact with the drain connection transparent conductive layer 15a in the opening 17p formed in the dielectric layer 17.
- the second transparent conductive layer 19a which is a pixel electrode, is electrically connected to the upper conductive layer 11c via the drain connection transparent conductive layer 15a.
- the contact portion 105 (3) also functions as an auxiliary capacitor having the lower conductive layer 3c as a lower electrode and the upper conductive layer 11c as an upper electrode.
- contact portion 105 Since the contact portions 105 (1) to 105 (3) (hereinafter simply referred to as “contact portion 105”) in the present embodiment have the above-described configuration, the following advantages can be obtained according to the present embodiment. .
- the drain electrode 11d and the second transparent conductive layer 19a can be electrically connected in one first contact hole CH1, thereby reducing the area required for the contact hole. it can.
- the drain connection transparent conductive layer 15a is provided so as to cover only a part of the side surface of the first contact hole CH1, so that the two transparent conductive layers are formed in the entire contact hole.
- the layout can be more efficient than the configuration in which the layers are arranged, and the first contact hole CH1 and the contact portion 105 can be reduced. Therefore, a higher definition TFT substrate can be realized. Furthermore, since the redundant structure of the second transparent conductive layer 19a and the drain electrode 11d is partially formed in the first contact hole CH1, the reliability of the contact portion 105 can be improved.
- the formation of the dielectric layer 17 can be performed with the drain-connected transparent conductive layer 15a covering the entire exposed surface of the drain electrode 11d. For this reason, the process damage which arises on the surface of the drain electrode 11d can be reduced more effectively.
- the contact portion 105 in contact with the second transparent conductive layer 19a is preferably disposed so as to overlap the gate wiring layer (the gate wiring 3 and the lower conductive layer 3c). Thereby, it is possible to suppress a decrease in the aperture ratio due to the contact portion 105 as compared with the conventional case, and a high transmittance can be realized.
- the contact portion 105 overlaps the gate wiring 3 or the gate electrode 3a as in the contact portions 105 (1) and 105 (2), a higher definition TFT substrate can be obtained. More preferably, the entire contact portion 105 is disposed so as to overlap the gate wiring 3 or the gate electrode 3a.
- the entire contact portion 105 is disposed so as to overlap the gate wiring 3 without increasing the width of the gate wiring 3. It is possible. Thereby, the transmittance can be increased more effectively, and further high definition can be achieved.
- each electrode pattern may be set so that the distance between the edge of the gate electrode 3a and the edge of the drain electrode 11d is 2 ⁇ m or more. Thereby, the fall of the transmittance
- the auxiliary capacitance wiring may be provided and the auxiliary capacitance may be formed thereon, but the auxiliary capacitance wiring itself may not be provided.
- a capacitor can be formed by disposing at least a part of the second transparent conductive layer 19 a so as to overlap the first transparent conductive layer 15 with the dielectric layer 17 interposed therebetween. This capacity can function as an auxiliary capacity.
- the semiconductor layer 7a used as the active layer of the TFT 101 is not particularly limited, but is, for example, an oxide semiconductor layer.
- the oxide semiconductor layer includes, for example, an In—Ga—Zn—O-based semiconductor (hereinafter abbreviated as “IGZO-based semiconductor”).
- IGZO-based semiconductor is a ternary oxide of In (indium), Ga (gallium), and Zn (zinc), and the ratio (composition ratio) of In, Ga, and Zn is not particularly limited.
- IGZO-based semiconductor is a ternary oxide of In (indium), Ga (gallium), and Zn (zinc), and the ratio (composition ratio) of In, Ga, and Zn is not particularly limited.
- In: Ga: Zn 2: 2: 1
- In: Ga: Zn 1: 1: 1: 2: 2: 1
- the IGZO semiconductor may be amorphous or crystalline.
- a crystalline IGZO-based semiconductor having a c-axis oriented substantially perpendicular to the layer surface is preferable.
- Such a crystal structure of an IGZO-based semiconductor is disclosed in, for example, Japanese Patent Application Laid-Open No. 2012-134475.
- the entire disclosure of Japanese Patent Application Laid-Open No. 2012-134475 is incorporated herein by reference. Since the oxide semiconductor has higher mobility than the amorphous silicon semiconductor, the size of the TFT 101 can be reduced. In addition to this, the application of the oxide semiconductor TFT to the semiconductor device of this embodiment has the following advantages.
- the aperture ratio of the pixel it is preferable to increase the aperture ratio of the pixel by arranging the contact portion 105 so as to overlap the gate wiring 3.
- Cgd becomes larger than before.
- the ratio of Cgd to pixel capacity: Cgd / [Cgd + (C LC + C CS )] is designed to be less than a predetermined value, so that the pixel capacity (C LC + C CS ) is increased by the amount of Cgd. Need to be increased.
- the amorphous silicon TFT cannot be written at the conventional frame frequency.
- the configuration in which the contact portion is overlapped with the gate wiring is not practical because it cannot be compatible with other characteristics required for the display device. Did not adopt the correct configuration.
- the present embodiment it is possible to increase the C CS using an auxiliary capacitor constituted by the first and second transparent conductive layer 15,19a and the dielectric layer 17 described above. Since the conductive layers 15 and 19a are both transparent, the transmittance does not decrease even when such an auxiliary capacitor is formed. Therefore, since the pixel capacity can be increased, the ratio of Cgd to the pixel capacity can be sufficiently reduced. Furthermore, when an oxide semiconductor TFT is applied to the embodiment, even when the pixel capacitance is increased, the oxide semiconductor has high mobility, and thus writing can be performed at a frame frequency equivalent to that of the conventional one. Therefore, the aperture ratio can be increased by an amount corresponding to the area of the contact portion 105 while maintaining the writing speed and keeping Cgd / [Cgd + (C LC + C CS )] sufficiently small.
- the second transparent conductive layer 19a is separated for each pixel and functions as a pixel electrode.
- Each second transparent conductive layer 19a pixel electrode
- the first transparent conductive layer 15 is disposed at least under the slit-shaped opening of the pixel electrode, it functions as a counter electrode of the pixel electrode and can apply a lateral electric field to the liquid crystal molecules.
- the first transparent conductive layer 15 is formed in each pixel so as to occupy substantially the entire region where the metal film such as the gate wiring 3 and the source wiring 11 is not formed (region transmitting light). .
- the first transparent conductive layer 15 occupies substantially the entire pixel (other than the opening 15p for forming the contact portion 105). Thereby, since the area of the part which overlaps with the 2nd transparent conductive layer 19a among the 1st transparent conductive layers 15 can be enlarged, the area of an auxiliary capacity can be increased. In addition, when the first transparent conductive layer 15 occupies substantially the entire pixel, an electric field from an electrode (or wiring) formed below the first transparent conductive layer 15 is shielded by the first transparent conductive layer 15. The advantage that it can be obtained.
- the occupied area of the first transparent conductive layer 15 with respect to the pixels is preferably 80% or more, for example.
- the semiconductor device 100 of the present embodiment can also be applied to a display device in an operation mode other than the FFS mode.
- a display device in an operation mode other than the FFS mode.
- it is applied to a vertical electric field drive type display device such as a VA mode
- the second transparent conductive layer 19a functions as a pixel electrode
- a transparent auxiliary capacitor is formed in the pixel.
- the dielectric layer 17 and the first transparent conductive layer 15 may be formed.
- ⁇ SG connection part formation region 103R> 6A and 6B are a plan view and a cross-sectional view, respectively, showing a part of the SG connection portion forming region 103R in the present embodiment.
- each SG connection portion 103 formed in the SG connection portion formation region 103R a lower conductive layer 3sg formed of the same conductive film as the gate wiring 3 and an upper portion formed of the same conductive film as the source wiring 11
- the conductive layer 11sg is connected to the lower transparent conductive layer 15sg.
- the SG connecting portion 103 includes a first connecting portion 103A that connects the lower conductive layer 3sg and the lower transparent conductive layer 15sg, and a second connection that connects the upper conductive layer 11sg and the lower transparent conductive layer 15sg. And a connecting portion 103B.
- the lower transparent conductive layer 15 sg is formed of, for example, the same conductive film as the first transparent conductive layer 15.
- the 103 A of 1st connection parts are the lower conductive layer 3sg, the gate insulating layer 5, the protective layer 9, and the interlayer insulating layer 14 extended so that the lower conductive layer 3sg might be covered, the gate insulating layer 5, the protective layer 9, and the interlayer A lower transparent conductive layer 15sg in contact with the lower conductive layer 3sg in the opening 14rA formed in the insulating layer 14 and an upper transparent conductive layer 19sg formed on the lower transparent conductive layer 15sg in the opening 14rA.
- the upper transparent conductive layer 19sg is formed of the same conductive film as the second transparent conductive layer (pixel electrode) 19a, for example.
- the second connection portion 103B is formed in the upper conductive layer 11sg formed on the gate insulating layer 5, the interlayer insulating layer 14 extending so as to cover the upper conductive layer 11sg, and the interlayer insulating layer 14 A lower transparent conductive layer 15sg in contact with the upper conductive layer 11sg in the opening 14rB and an upper transparent conductive layer 19sg formed on the lower transparent conductive layer 15sg in the opening 14rB are provided.
- one opening including the openings 14rA and 14rB of the first and second connection portions 103A and 103B is formed, but these openings 14rA and 14rB are two openings separated from each other. May be.
- the lower transparent conductive layer 15sg and the upper transparent conductive layer 19sg are stacked in the openings 14rA and 14rB to form a redundant structure. Thereby, the reliability of the SG connection unit 103 can be improved.
- the upper conductive layer 11 sg is connected to the source wiring 11, and the lower conductive layer 3 sg is connected to the lower conductive layer 3 t of the terminal portion (source terminal portion) 102.
- the source wiring 11 can be connected to the terminal portion 102 via the SG connecting portion 103.
- FIG. 7 is a diagram illustrating a liquid crystal display device 1000 of this embodiment.
- the liquid crystal display device 1000 includes a liquid crystal layer 930, a TFT substrate 100 (corresponding to the semiconductor device 100 of the first embodiment) and the counter substrate 900 facing each other with the liquid crystal layer 930 interposed therebetween, And polarizing plates 910 and 920 disposed on the outer sides of the counter substrate 900 and a backlight unit 940 that emits display light toward the TFT substrate 100.
- a scanning line driving circuit for driving a plurality of scanning lines (gate bus lines) and a signal line driving circuit for driving a plurality of signal lines (data bus lines) are arranged.
- the scanning line driving circuit and the signal line driving circuit are connected to a control circuit arranged outside the TFT substrate 100.
- a scanning signal for switching on / off of the TFT is supplied from the scanning line driving circuit to the plurality of scanning lines, and the display signal (from the signal line driving circuit to the second transparent conductive layer 19a which is a pixel electrode). Applied voltage) is supplied to a plurality of signal lines.
- the COM signal is supplied to the first transparent conductive layer 15 that is the common electrode via the COM signal wiring.
- the counter substrate 900 includes a color filter.
- the color filter includes an R (red) filter, a G (green) filter, and a B (blue) filter, which are arranged corresponding to the pixels.
- the liquid crystal molecules of the liquid crystal layer are changed for each pixel according to the potential difference applied between the first transparent conductive layer 15 that is the common electrode of the TFT substrate 100 and the second transparent conductive layer 19a that is the pixel electrode.
- the display is made.
- a method for simultaneously forming the film on the substrate 1 will be described.
- the manufacturing method of this embodiment is not limited to the example demonstrated below.
- the configurations of the TFT 101, the contact portion 105, the terminal portion 102, and the SG connection portion 103 can be changed as appropriate.
- FIG. 8 is a diagram showing a flow of a manufacturing method of the semiconductor device 100 of the present embodiment.
- masks are used in STEPs 1 to 8, respectively, and a total of eight masks are used.
- FIGS. 9A to 11A are plan views showing steps of forming the TFT 101, the contact portion 105, the SG connection portion 103, and the terminal portion 102 on the same substrate, respectively.
- FIGS. 9B to 11B are cross-sectional views corresponding to (a) to (h) of FIGS. 9A to 11A, respectively.
- FIG. 9A (a), FIG. 9B (a) Gate wiring formation process
- a gate wiring metal film thickness: for example, 50 nm to 500 nm
- the metal film for gate wiring is formed on the substrate 1 by sputtering or the like.
- a gate wiring layer is formed by patterning the metal film for gate wiring.
- the gate electrode 3a and the lower conductive layer 3c of the TFT 101 are integrated with the gate wiring 3 by patterning the metal film for the gate wiring.
- the lower conductive layer 3t of the terminal portion 102 is formed in the terminal portion formation region 102R
- the lower conductive layer 3sg of the SG connection portion 103 is formed in the SG connection portion formation region 103R.
- the substrate for example, a glass substrate, a silicon substrate, a heat-resistant plastic substrate (resin substrate), or the like can be used.
- the material for the metal film for gate wiring is not particularly limited.
- a film containing a metal such as aluminum (Al), tungsten (W), molybdenum (Mo), tantalum (Ta), chromium (Cr), titanium (Ti), copper (Cu), or an alloy thereof, or a metal nitride thereof It can be used as appropriate.
- a laminated film in which these plural films are laminated may be used.
- a laminated film made of Cu (copper) / Ti (titanium) is used.
- the thickness of the upper Cu layer is, for example, 300 nm, and the thickness of the lower Ti layer is, for example, 30 nm.
- the patterning is performed by forming a resist mask (not shown) by a known photolithography method and then removing a portion of the gate wiring metal film not covered with the resist mask. After patterning, the resist mask is removed.
- STEP 2 Gate insulating layer / semiconductor layer forming step (FIGS. 9A (b) and 9B (b))
- the gate insulating layer 5 is formed on the substrate 1 so as to cover the gate electrode 3a, the lower conductive layer 3c, the lower conductive layers 3t, and 3sg. To do.
- a semiconductor film is formed on the gate insulating layer 5 and patterned.
- the semiconductor layer 7a is formed in the transistor formation region 101R, and the semiconductor layer 7t is formed in the terminal portion formation region 102R.
- the semiconductor layer 7a is arranged so that at least a part thereof overlaps with the gate electrode 3a.
- the semiconductor layer 7t has an opening 7q on the lower conductive layer 3t.
- the opening 7q of the semiconductor layer 7t is preferably located inside the contour of the lower conductive layer 3t.
- the semiconductor film may be removed in the SG connecting portion forming region 103R.
- a silicon oxide (SiOx) layer, a silicon nitride (SiNx) layer, a silicon oxynitride (SiOxNy; x> y) layer, a silicon nitride oxide (SiNxOy; x> y) layer, or the like is appropriately used. it can.
- the gate insulating layer 5 may be a single layer or may have a laminated structure. For example, a silicon nitride layer, a silicon nitride oxide layer, or the like is formed on the substrate side (lower layer) to prevent diffusion of impurities and the like from the substrate 1, and the insulating layer is secured on the upper layer (upper layer).
- a silicon oxide layer, a silicon oxynitride layer, or the like may be formed.
- the gate insulating layer 5 having a two-layer structure is formed.
- the lower layer of the gate insulating layer 5 may be a SiNx film having a thickness of 300 nm, for example, and the upper layer may be a SiO 2 film having a thickness of 50 nm, for example.
- These insulating layers are formed using, for example, a CVD method.
- the uppermost layer of the gate insulating layer 5 is a layer containing oxygen (for example, an oxide layer such as SiO 2 is preferable. Accordingly, when oxygen vacancies are generated in the oxide semiconductor layer, the oxygen vacancies can be recovered by oxygen contained in the oxide layer, so that oxygen vacancies in the oxide semiconductor layer can be effectively reduced.
- an oxide semiconductor layer is formed as the semiconductor layer 7a.
- an oxide semiconductor film (not shown) having a thickness of 30 nm to 200 nm is formed on the gate insulating layer 5 by sputtering.
- the oxide semiconductor film is, for example, an In—Ga—Zn—O-based amorphous oxide semiconductor film (IGZO-based semiconductor film) containing In, Ga, and Zn at a ratio of 1: 1: 1.
- IGZO-based semiconductor film with a thickness of, for example, 50 nm is formed as the oxide semiconductor film.
- the oxide semiconductor film is patterned by photolithography to obtain the semiconductor layer 7a.
- the semiconductor layer 7a is disposed so as to overlap the gate electrode 3a with the gate insulating layer 5 interposed therebetween.
- the ratios of In, G, and Zn in the IGZO-based semiconductor film are not limited to the above, and can be selected as appropriate.
- the semiconductor layer 7a may be formed using another oxide semiconductor film instead of the IGZO-based semiconductor film.
- Other oxide semiconductor films include InGaO 3 (ZnO) 5 , magnesium zinc oxide (Mg x Zn 1-x O), cadmium zinc oxide (Cd x Zn 1-x O), cadmium oxide (CdO), and the like. Also good.
- STEP 3 Etching process of protective layer and gate insulating layer (FIGS. 9A (c) and 9B (c))
- a protective layer (thickness: 30 nm or more and 200 nm or less) 9 is formed on the semiconductor layers 7 a and 7 t and the gate insulating layer 5.
- the protective layer 9 is etched using a resist mask (not shown).
- the etching conditions are selected according to the material of each layer so that the protective layer 9 is etched and the semiconductor layers 7a and 7t and the gate insulating layer 5 are not etched.
- the etching conditions here include the type of etching gas, the temperature of the substrate 1, the degree of vacuum in the chamber, and the like when dry etching is used. When wet etching is used, the type of etching solution, etching time, and the like are included.
- the opening 9p that exposes both sides of the region to be the channel region of the semiconductor layer 7a in the protective layer 9 is provided in the transistor formation region 101R. Is formed.
- the semiconductor layer 7a functions as an etch stopper.
- the protective layer 9 may be patterned so as to cover at least a region to be a channel region. A portion of the protective layer 9 located on the channel region functions as a channel protective film. For example, in the subsequent source / drain separation step, etching damage generated in the semiconductor layer 7a can be reduced, so that deterioration of TFT characteristics can be suppressed.
- the protective layer 9 is formed so as to cover the upper surface of the semiconductor layer 7t.
- the protective layer 9 has an opening 9q located on the lower conductive layer 3c. 9A (c) and 9B (c), the side surface of the opening 9q of the protective layer 9 and the side surface of the opening 7q of the semiconductor layer 7t are shown to be aligned.
- the end is preferably located on the outer side (opening side) than the end of the semiconductor layer 7t. That is, when viewed from the normal direction of the substrate 1, the opening 9q of the protective layer 9 is preferably inside the opening 7q of the semiconductor layer 7t.
- the entire upper surface of the semiconductor layer 7t can be more reliably covered with the protective layer 9, so that damage to the semiconductor layer 7t can be reduced in the subsequent etching step for forming the source / drain electrodes.
- the protective layer 9 may also cover the side surface of the semiconductor layer 7t.
- the protective layer 9 is formed with an opening 9w located on the lower conductive layer 3c and an opening 9r located on the lower conductive layer 3sg. .
- the protective layer 9 may be a silicon oxide film, a silicon nitride film, a silicon oxynitride film, or a laminated film thereof.
- a silicon oxide film (SiO 2 film) having a thickness of, for example, 100 nm is formed as the protective layer 9 by CVD.
- the protective layer 9 When the protective layer 9 is formed over the semiconductor layers 7a and 7t, process damage generated in the oxide semiconductor layer can be reduced.
- an oxide film such as a SiOx film (including a SiO 2 film) is preferably used.
- the oxygen vacancies can be recovered by oxygen contained in the oxide film, so that the oxidation vacancies in the oxide semiconductor layer can be more effectively reduced.
- a SiO 2 film having a thickness of, for example, 100 nm is used as the protective layer 9.
- STEP 4 Source / Drain Formation Step (FIGS. 10A (d) and 10B (d))
- a metal film for source wiring is formed on the protective layer 9 and in the openings 9p, 9w, 9r, 9q.
- the source wiring metal film is formed by, for example, sputtering.
- a source wiring layer is formed by patterning the source wiring metal film.
- the source electrode 11s, the drain electrode 11d, and the upper conductive layer 11c are formed from the source wiring metal film in the transistor formation region 101R.
- the source electrode 11s and the drain electrode 11d are each connected to the semiconductor layer 7a in the opening 9p.
- the upper conductive layer 11c is formed in the opening 9w.
- the upper conductive layer 11sg is formed on a part of the gate insulating layer 5 exposed by the opening 9r. A portion of the gate insulating layer 5 that is not covered with the upper conductive layer 11sg remains exposed.
- the metal film for source wiring is removed.
- the material of the metal film for source wiring is not particularly limited, and metal such as aluminum (Al), tungsten (W), molybdenum (Mo), tantalum (Ta), copper (Cu), chromium (Cr), titanium (Ti), etc.
- metal such as aluminum (Al), tungsten (W), molybdenum (Mo), tantalum (Ta), copper (Cu), chromium (Cr), titanium (Ti), etc.
- a film containing an alloy thereof or a metal nitride thereof can be used as appropriate.
- a laminated film having a Ti layer having a thickness of 30 nm as a lower layer and a Cu layer having a thickness of 300 nm as an upper layer is used.
- STEP 5 Interlayer insulating layer forming step (FIGS. 10A (e) and 10B (e))
- the first insulating layer 12 and the second insulating layer 13 are formed in this order on the substrate 1.
- These insulating layers 12 and 13 constitute an interlayer insulating layer 14.
- an inorganic insulating layer (passivation film) is formed by, for example, a CVD method.
- an organic insulating layer is formed as the second insulating layer 13 on the first insulating layer 12.
- the second insulating layer 13 is patterned, and openings are formed in a portion of the second insulating layer 13 located on the upper conductive layer 11c and a portion located on the upper conductive layer 11sg and the lower conductive layer 3sg. Provide. Further, the second insulating layer 13 is removed in the terminal portion formation region 102R.
- the first insulating layer 12, the gate insulating layer 5, and the protective layer 9 are etched using the patterned second insulating layer 13 as a mask. Thereby, in the transistor formation region 101R, a portion of the first insulating layer 12 that is not covered with the second insulating layer 13 is removed. As a result, a first contact hole CH1 exposing a part of the upper conductive layer 11c is formed in the first and second insulating layers 12 and 13.
- the first and second insulating layers 12 and 13 are formed with an opening 14rA exposing a part of the lower conductive layer 3sg and an opening 14rB exposing a part of the upper conductive layer 11sg. In this example, these openings 14rA and 14rB are connected.
- the protective layer 9, the portion of the first insulating layer 12 located in the opening of the semiconductor layer 7t, and the portion of the gate insulating layer 5 that is not covered with the semiconductor layer 7t are removed.
- the semiconductor layer 7t functions as an etching stopper in etching the protective layer 9, and functions as an etching mask in etching the gate insulating layer 5.
- the semiconductor layer 7t can be used as an etching mask, it is not necessary to form a separate mask for forming the opening, which is advantageous.
- Openings 5q and 7q constitute second contact hole CH2.
- the side surface of the semiconductor layer 7t is aligned with the side surface of the gate insulating layer 5.
- a silicon oxide (SiOx) film, a silicon nitride (SiNx) film, a silicon oxynitride (SiOxNy; x> y) film, a silicon nitride oxide (SiNxOy; x> y) film, or the like is used as appropriate. Can do. An insulating material having another film quality may be used.
- the second insulating layer 13 is preferably a layer made of an organic material, and may be, for example, a positive photosensitive resin film.
- a SiO 2 film having a thickness of, for example, 200 nm is used as the first insulating layer 12, and a positive photosensitive resin film having a thickness of, for example, 2000 nm is used as the second insulating layer 13.
- the material of these insulating layers 12 and 13 is not limited to the said material.
- the material and etching conditions of each insulating layer 12, 13 may be selected so that the second insulating layer 13 can be etched without etching the first insulating layer 12. . Therefore, the second insulating layer 13 may be an inorganic insulating layer, for example.
- the gate insulating layer 5, and the protective layer 9 materials and etching conditions are selected so that these layers can be etched and the semiconductor layer 7t and the upper conductive layer 11sg are not etched. That's fine.
- STEP 6 First transparent conductive layer forming step (FIGS. 10A (f) and 10B (f)) Next, a transparent conductive film (not shown) is formed on the second insulating layer 13, in the contact holes CH1 and CH2, and in the openings 14rA and 14rB, for example, by sputtering, and patterned. Known photolithography can be used for the patterning.
- the first transparent conductive layer 15 is formed on the second insulating layer 13 by patterning the transparent conductive film in the transistor formation region 101R.
- a drain connection transparent conductive layer 15a electrically isolated from the first transparent conductive layer 15 is formed in the first contact hole CH1.
- the drain connection transparent conductive layer 15a is in contact with the upper conductive layer 11c in the first contact hole CH1.
- An end of the drain connection transparent conductive layer 15 a may be located on the second insulating layer 13.
- the lower transparent conductive layer 15sg is formed in the openings 14rA and 14rB by patterning the transparent conductive film.
- the lower transparent conductive layer 15sg contacts the lower conductive layer 3sg in the opening 14rA, and contacts the upper conductive layer 11sg in the opening 14rB.
- the end portion of the lower transparent conductive layer 15 sg may be located on the second insulating layer 13.
- the lower transparent connection layer 15t is formed in the second contact hole CH2 and on a part of the semiconductor layer 7t by patterning the transparent conductive film.
- the lower transparent connection layer 15t is in contact with the lower conductive layer 3t in the second contact hole CH2.
- the semiconductor layer 7t is also patterned simultaneously with the patterning of the lower transparent connection layer 15t.
- the terminal portions may be electrically connected.
- the semiconductor layer 7t is patterned together with the lower transparent connection layer 15t as in the present embodiment, the patterns of the semiconductor layer 7t of each terminal portion can be separated from each other, which is preferable.
- the lower transparent connection layer 15t and the semiconductor layer 7t are simultaneously patterned, the lower transparent connection layer 15t and the gate are formed only in the periphery (periphery, fringe portion) of the second contact hole CH2 without increasing the number of manufacturing steps.
- the semiconductor layer 7 t can be left between the insulating layer 5. Therefore, it is possible to suppress conduction between the terminal portions while ensuring the reliability of the terminal portions.
- the first transparent conductive layer 15 may be formed so as to occupy substantially the entire portion other than the contact portion 105 in the pixel.
- the transparent conductive film for forming the first transparent conductive layer 15, the drain connection transparent conductive layer 15a, the lower transparent conductive layer 15sg, and the lower transparent connection layer 15t for example, an ITO (indium tin oxide) film (thickness: 50 to 200 nm), an IZO film, a ZnO film (zinc oxide film), or the like can be used.
- an ITO film having a thickness of, for example, 100 nm is used as the transparent conductive film.
- Step 7 Dielectric layer forming step (FIGS. 11A (g) and 11B (g))
- the dielectric layer 17 is formed by, for example, the CVD method so as to cover the entire surface of the substrate 1.
- a resist mask (not shown) is formed on the dielectric layer 17 and the dielectric layer 17 is etched.
- an opening 17p exposing the drain connection transparent conductive layer 15a is formed in the dielectric layer 17.
- the opening 17p is arranged so that the drain-connected transparent conductive layer 15a is exposed at a part of the bottom surface of the first contact hole CH1, but the position of the opening 17p is not particularly limited.
- an opening 17r exposing the lower transparent conductive layer 15sg is formed in the dielectric layer 17.
- the opening 17r is formed so that the entire portion located in the openings 14rA and 14rB in the lower transparent conductive layer 15sg is exposed.
- the dielectric layer 17 is removed.
- the dielectric layer 17 is not particularly limited. For example, a silicon oxide (SiOx) film, a silicon nitride (SiNx) film, a silicon oxynitride (SiOxNy; x> y) film, or a silicon nitride oxide (SiNxOy; x> y) film is used. Etc. can be used as appropriate.
- the dielectric layer 17 is also used as a capacitive insulating film constituting an auxiliary capacitance, the material and thickness of the dielectric layer 17 are appropriately selected so that a predetermined capacitance CCS is obtained. It is preferable.
- SiNx can be suitably used from the viewpoint of dielectric constant and insulation.
- the thickness of the dielectric layer 17 is, for example, not less than 150 nm and not more than 400 nm. If it is 150 nm or more, insulation can be ensured more reliably. On the other hand, if it is 400 nm or less, a desired capacity can be obtained more reliably.
- a SiNx film having a thickness of 300 nm is used as the dielectric layer 17.
- STEP 8 Second transparent conductive layer forming step (FIGS. 11A (h) and 11B (h)) Subsequently, a transparent conductive film (not shown) is formed on the dielectric layer 17, in the openings 17p and 17r, and in the second contact hole CH2, for example, by sputtering, and patterned. Known photolithography can be used for the patterning.
- the second transparent conductive layer 19a is formed in the transistor formation region 101R.
- the second transparent conductive layer 19a is in contact with the drain connection transparent conductive layer 15a in the opening 17p.
- the second transparent conductive layer 19a and the drain electrode 11d can be electrically connected via the drain connection transparent conductive layer 15a and the upper conductive layer 11c.
- at least a part of the second transparent conductive layer 19 a is disposed so as to overlap the first transparent conductive layer 15 with the dielectric layer 17 interposed therebetween.
- the second transparent conductive layer 19a functions as a pixel electrode in the FFS mode display device. In this case, in each pixel, a plurality of slits may be formed in a portion of the second transparent conductive layer 19a that does not overlap with the gate wiring 3.
- the upper transparent conductive layer 19sg in contact with the lower transparent conductive layer 15sg in the opening 17r is obtained from the transparent conductive film.
- the lower conductive layer 3sg and the upper conductive layer 11sg can be connected via the lower transparent conductive layer 15sg and the upper transparent conductive layer 19sg.
- the lower transparent conductive layer 15sg and the upper transparent conductive layer 19sg are stacked in the openings 14rA and 14rB to obtain a redundant structure, a highly reliable connection portion can be realized.
- the upper transparent connection layer 19t of the terminal portion 102 is formed from the transparent conductive film.
- the upper transparent connection layer 19t is in contact with the lower transparent connection layer 15t in the second contact hole CH2.
- the lower conductive layer 3t and the upper transparent connection layer 19t can be connected via the lower transparent connection layer 15t.
- the lower transparent connection layer 15t and the upper transparent connection layer 19t are laminated and a redundant structure is obtained, a highly reliable terminal portion can be realized.
- the transparent conductive film for forming the second transparent conductive layer 19a, the upper transparent connection layer 19sg, and the upper transparent connection layer 19t for example, an ITO (indium tin oxide) film (thickness: 50 to 150 nm), an IZO film Alternatively, a ZnO film (zinc oxide film) or the like can be used.
- an ITO film having a thickness of, for example, 100 nm is used as the transparent conductive film.
- a protective layer is provided between the gate insulating layer 5 and the interlayer insulating layer 14 in almost the entire display region, but the protective layer is removed in the terminal portion forming region 102R.
- a protective layer is used in the process of forming the terminal portion in order to suppress process damage of the semiconductor layer 7t.
- the method of manufacturing the terminal portion 102 shown in FIG. 2B, the TFT 101 and the contact portion 105 (3) shown in FIG. 4 has been described.
- the terminal portion 102 (2) shown in FIG. 3), the contact part 105 (1) shown in FIG. 3 and the contact part 105 (2) shown in FIG. 4 can also be manufactured according to the flow shown in FIG.
- the upper conductive layer 11sg formed from the source wiring metal using the transparent conductive layers 15 and 19a and the lower conductive layer formed from the gate wiring metal.
- a structure in which the upper conductive layer 11sg and the lower conductive layer 3sg are in direct contact with each other is employed.
- the present embodiment is different from the first embodiment in that the drain connection transparent conductive layer 15a is not formed in the contact portion 105, and the second transparent conductive layer 19a and the upper conductive layer 11c are in direct contact.
- the contact portion 105 is provided on the lower conductive layer 3c that functions as an auxiliary capacitance wiring.
- the manufacturing method described in the first embodiment is different in that the opening 7q is formed in the semiconductor layer 7t using the protective layer 9 as an etching mask.
- FIGS. 9B to 11B are process cross-sectional views illustrating an example of the method for manufacturing the semiconductor device of this embodiment. Components similar to those in FIGS. 9B to 11B are denoted by the same reference numerals. In the following description, the description of the same steps as in the first embodiment (including the material of each component, the film forming method, the etching method, the film thickness, etc.) is omitted.
- a gate wiring metal 3 ′ is formed on the substrate 1.
- the gate wiring metal 3 ' is patterned to obtain a gate wiring layer.
- the gate electrode 3a and the lower conductive layer 3c are formed in the transistor formation region 101R.
- the lower conductive layer 3c may be an auxiliary capacitance wiring.
- a lower conductive layer 3sg and a lower conductive layer 3t are formed in the SG connection portion formation region 103R and the terminal portion formation region 102R, respectively.
- the gate insulating layer 5 is formed so as to cover the gate electrode 3a, the lower conductive layer 3c, the lower conductive layer 3sg, and the lower conductive layer 3t.
- a semiconductor film 7 ′ is formed on the gate insulating layer 5. Subsequently, the semiconductor film 7 'is patterned.
- the semiconductor layer 7a and the semiconductor layer 7c are formed in the transistor formation region 101R, and the semiconductor layer 7t is formed in the terminal portion formation region 102R.
- the semiconductor layer 7a is arranged so that a part thereof overlaps with the gate electrode 3a.
- the semiconductor layer 7c is disposed so as to overlap the lower conductive layer 3c in a region where the contact portion and the auxiliary capacitance are to be formed.
- the semiconductor layer 7t is arranged so that a part thereof overlaps the lower conductive layer 3t.
- a protective layer 9 is formed so as to cover the gate insulating layer 5 and the semiconductor layers 7a, 7c, and 7t.
- a mask layer 31 having a predetermined opening is formed on the protective layer 9. Using this mask layer 31 as an etching mask, the protective layer 9 is patterned. At this time, portions of the gate insulating layer 5 that are not covered by the mask layer 31 and the semiconductor layers 7a, 7c, and 7t are also removed (simultaneous etching of the protective layer 9 and the gate insulating layer 5). As a result, as shown in FIG.
- openings 9p are formed in the protective layer 9 to expose both sides of the portion that becomes the channel region of the semiconductor layer 7a.
- the protective layer 9 and the gate insulating layer 5 are etched to form an opening 9r exposing a part of the lower conductive layer 3sg.
- an opening 9q exposing a part of the semiconductor layer 7t is formed.
- a source wiring metal film 11 ′ is formed so as to cover the entire surface of the substrate 1. Thereafter, the source wiring metal film 11 'is patterned. As a result, as shown in FIG. 14J, in the transistor formation region 101R, the source electrode 11s and the drain electrode 11d in contact with the semiconductor layer 7a are formed in the opening 9p, and the TFT 101 is obtained. An upper conductive layer 11c is formed on the lower conductive layer 3c with the gate insulating layer 5 and the semiconductor layer 7c interposed therebetween. In the SG connection part formation region 103R, the upper conductive layer 11sg in contact with the lower conductive layer 3sg is formed in the opening 9r.
- the SG connection section 103 (2) is obtained.
- the semiconductor layer 7t is also etched together with the source wiring metal film 11 '.
- the protective layer 9 functions as an etch stop for the etching of the source wiring metal film 11 ′ and also functions as an etching mask for the etching of the semiconductor layer 7 t. Accordingly, only the portion of the semiconductor layer 7t that is not covered with the protective layer 9 is removed, and the portion that is covered with the protective layer 9 remains.
- the first insulating layer 12 is formed on the entire surface of the substrate 1, and the first insulating layer 12 and the protective layer 9 are patterned. As a result, portions of the first insulating layer 12 and the protective layer 9 located in the terminal portion formation region 102R are removed.
- the second insulating layer 13 is formed and patterned. Thereby, an opening 13p located on the upper conductive layer 11c is formed in the second insulating layer 13, and a portion of the second insulating layer 13 located in the terminal portion formation region 102R is removed.
- a transparent conductive film is formed on the entire surface of the substrate 1 and patterned.
- the first transparent conductive layer 15 is formed on the second insulating layer 13 in the transistor formation region 101R and the SG connection portion formation region 103R.
- the 1st transparent conductive layer 15 has the opening part 15p in the part used as a contact part.
- the opening 13 p of the second insulating layer 13 is located inside the opening 15 p of the first transparent conductive layer 15.
- the semiconductor layer 7t is also etched at the same time when the transparent conductive film is patterned.
- the lower transparent connection layer 15t in contact with the lower conductive layer 3t is formed in the opening 5q, and the semiconductor layer 7t is separated for each terminal portion.
- the semiconductor layer 7t is located between the lower transparent connection layer 15t and the gate insulating layer 5, and the end opposite to the opening is aligned with the end of the lower transparent connection layer 15t.
- the dielectric layer 17 is formed on the entire surface of the substrate 1 (including the inside of the opening 13p). Subsequently, the dielectric layer 17 is patterned. As a result, as shown in FIG. 15N, the portion of the dielectric layer 17 located in the terminal portion formation region 102R is removed. In addition, in the opening 13p of the second insulating layer 13, an opening 17p reaching the upper conductive layer 11c is formed in the dielectric layer 17 and the first insulating layer 12 (the dielectric layer 17 and the first insulating layer 12). And simultaneous etching).
- a transparent conductive film 19 ' is formed on the entire surface of the substrate 1 (including the inside of the opening 17p) and patterned.
- the second transparent conductive layer 19a to be the pixel electrode is formed in the transistor formation region 101R and the SG connection portion formation region 103R.
- the second transparent conductive layer 19a is in contact with the upper conductive layer 11c in the opening 17p to form a contact portion 105 (4).
- An upper transparent connection layer 19t in contact with the lower transparent connection layer 15t is formed in the terminal portion formation region 102R. In this way, the terminal portion 102 (2) is obtained.
- the highly reliable terminal portion 102 can be easily formed.
- the dielectric layer 17 can be formed with the surface of the upper conductive layer 11c protected by the first insulating layer 12 in the step of forming the contact portion and the auxiliary capacitance. 11c process damage can be reduced.
- the SG connection portion 103 (2) has a structure in which the source wiring layer and the gate wiring layer are in direct contact with each other, it is possible to reduce the size and reduce the resistance.
- the third embodiment is different from the first embodiment described above in that a dielectric layer is provided around (around) the contact hole of the terminal portion. Since the structure of the TFT and the SG connection portion is the same as that of the first embodiment, description thereof is omitted.
- FIGS. 16A and 16B are a plan view and a cross-sectional view showing the terminal portion 202 formed in the peripheral region of the TFT substrate, respectively.
- the same components as those in FIG. FIG. 16B shows two adjacent terminals, but the number of terminals is not particularly limited.
- the terminal portion 202 is different from the terminal portion 102 shown in FIG. 2 in that a dielectric layer 17t is formed between the lower transparent connection layer 15t and the upper transparent connection layer 19t around the contact hole CH. Yes. In the terminal portion 202, electrical connection between the upper transparent connection layer 19t and the lower conductive layer 3t is ensured through the lower transparent connection layer 15t.
- the lower conductive layer 3t is formed of the same conductive film as the gate wiring 3, for example.
- the semiconductor layer 7t is formed of the same semiconductor film as the semiconductor layer 7a that is the active layer of the TFT 101.
- the dielectric layer 17 t is formed of the same dielectric film as the dielectric layer 17.
- the terminal portion 202 has a redundant structure including the lower transparent connection layer 15t and the upper transparent connection layer 19t, so that high reliability can be ensured.
- the lower transparent connection layer 15t is formed of the same transparent conductive film as the common electrode
- the upper transparent connection layer 19t is the same conductive as the pixel electrode. It is preferable to form from a film. In this manner, by using the pair of electrode layers that become the common electrode and the pixel electrode, the terminal portion 202 having a redundant structure can be formed while suppressing an increase in the number of manufacturing steps and the number of masks.
- the semiconductor layer 7t, the dielectric layer 17t, the upper transparent connection layer 19t, and the lower transparent connection layer 15t are preferably overlapped.
- the dielectric layer 17t is preferably in contact with not only the upper surface of the lower transparent connection layer 15t but also the upper surface of the gate insulating layer 5.
- the dielectric layer 17t is disposed so as to cover the side surface of the lower transparent connection layer 15t and the side surface of the end portion of the semiconductor layer 7t opposite to the contact hole CH, thereby reducing process damage to the semiconductor layer 7t. it can.
- the end of the semiconductor layer 7t on the opening 7q side may be aligned with the side surface of the gate insulating layer 5 on the opening 5q side.
- Such a configuration can be obtained by forming an opening 5q in the gate insulating layer 5 using the semiconductor layer 7t as an etching mask in the manufacturing method described later.
- the side surface of the semiconductor layer 7t opposite to the opening 7q may be aligned with the side surface of the lower transparent connection layer 15t.
- Such a configuration can be obtained by simultaneously etching the semiconductor layer 7t and the lower transparent connection layer 15t in the manufacturing method described later.
- the semiconductor device of this embodiment can also be manufactured along the flow shown in FIG.
- the steps from STEP1 to STEP6 are the same as the steps described above with reference to FIGS. 9A, 9B, 10A, and 10B, and thus the description thereof is omitted here.
- 17A is a process cross-sectional view for explaining the process of STEP7
- FIG. 17B is a process cross-sectional view for explaining the process of STEP8.
- STEP1 to STEP6 Transistor formation process (not shown) First, similarly to the steps shown in FIGS. 9A, 9B, 10A, and 10B, formation of a gate wiring, a semiconductor layer, a protective layer, a source / drain, an interlayer insulating layer, and a first transparent conductive layer on the substrate 1 is performed. Do.
- Step 7 Dielectric layer forming step (FIG. 17A)
- the dielectric layer 17 is formed by, for example, the CVD method so as to cover the entire surface of the substrate 1.
- a resist mask (not shown) is formed on the dielectric layer 17 and the dielectric layer 17 is etched.
- an opening 17p exposing the drain connection transparent conductive layer 15a is formed in the dielectric layer 17.
- an opening 17r exposing the lower transparent conductive layer 15sg is formed in the dielectric layer 17.
- the opening 17r is formed so that the entire portion located in the openings 14rA and 14rB in the lower transparent conductive layer 15sg is exposed.
- the dielectric layer 17t is formed on the lower transparent connection layer 15t in the periphery (periphery) of the second contact hole CH2.
- the dielectric layer 17t is disposed so as to overlap with at least a part of the semiconductor layer 7t when viewed from the normal direction of the substrate 1.
- STEP 8 Second transparent conductive layer forming step (FIG. 17B) Subsequently, a transparent conductive film (not shown) is formed on the dielectric layer 17, in the openings 17p and 17r, and in the second contact hole CH2, for example, by sputtering, and patterned. Thereby, as shown in FIG. 17B, the second transparent conductive layer 19a is formed in the transistor formation region 101R. In the SG connection part formation region 103R, an upper transparent conductive layer 19sg in contact with the lower transparent conductive layer 15sg in the opening 17r is obtained. In the terminal portion formation region 102R, the upper transparent connection layer 19t of the terminal portion 102 is formed from the transparent conductive film.
- the upper transparent connection layer 19t is in contact with the lower transparent connection layer 15t in the second contact hole CH2. Further, at least part of the dielectric layer 17t is located between the upper transparent connection layer 19t and the lower transparent connection layer 15t.
- the end portion of the upper transparent connection layer 19t may be located on the dielectric layer 17t as shown in FIG. Alternatively, as shown in FIG. 16 (b), it is located on the gate insulating layer 5 and covers the entire top surface of the dielectric layer 17t and the side surface of the dielectric layer 17t opposite to the second contact hole CH2. Good.
- Embodiment 4 a semiconductor device according to a fourth embodiment of the present invention will be described.
- the TFT and SG connection part in Embodiment 4 have the same configuration as the TFT and SG connection part in Embodiment 2 described above, but the terminal part has the same structure as the terminal part in Embodiment 3. Therefore, the description of the configuration of the semiconductor device of this embodiment is omitted.
- 18A to 18C are process cross-sectional views for explaining the method for manufacturing a semiconductor device of this embodiment.
- the dielectric layer 17 is formed by the same method as described above with reference to FIGS.
- the dielectric layer 17 is patterned. Thereby, in the transistor formation region 101R, an opening 17p reaching the upper conductive layer 11c is formed in the dielectric layer 17 and the first insulating layer 12. In the terminal portion formation region 102R, the dielectric layer 17t is formed around the second contact hole CH2 so as to cover a part of the lower transparent connection layer 15t. The dielectric layer 17t is disposed so as to overlap with at least a part of the semiconductor layer 7t when viewed from the normal direction of the substrate 1.
- a transparent conductive film 19 ' is formed on the entire surface of the substrate 1, and the transparent conductive film 19' is patterned.
- the second transparent conductive layer 19a is formed in the transistor formation region 101R.
- the upper transparent connection layer 19t of the terminal portion 102 is formed from the transparent conductive film 19 '.
- the upper transparent connection layer 19t is in contact with the lower transparent connection layer 15t in the second contact hole CH2. Further, in the vicinity of the second contact hole CH2, it is in contact with the dielectric layer 17t.
- the upper transparent connection layer 19t is formed so as to cover the entire dielectric layer 17t, and is in contact with the gate insulating layer 5 at the end. The end portion of the upper transparent connection layer 19t may be located on the dielectric layer 17t.
- the embodiment of the present invention can be widely applied to a semiconductor device including a thin film transistor and two transparent conductive layers on a substrate.
- a semiconductor device having a thin film transistor such as an active matrix substrate and a display device including such a semiconductor device.
Abstract
Description
本発明による半導体装置の実施形態1は、アクティブマトリクス型の液晶表示装置に使用されるTFT基板である。以下では、FFSモードの表示装置に使用されるTFT基板を例に説明する。なお、本実施形態の半導体装置は、TFTと2層の透明導電層とを基板上に有していればよく、他の動作モードの液晶表示装置、液晶表示装置以外の各種表示装置や電子機器などに用いられるTFT基板を広く含むものとする。
まず、本実施形態のTFT基板における端子部の構造を説明する。図2(a)および(b)は、それぞれ、TFT基板の周辺領域に形成された端子部を示す平面図および断面図である。なお、図2(b)では、隣接する2つの端子を図示しているが、端子の個数は特に限定されない。
本実施形態の半導体装置100は画素毎にTFT101、およびTFT101と画素電極とを接続するコンタクト部105(1)とを有している。本実施形態では、コンタクト部105(1)もトランジスタ形成領域101Rに設けられる。
従来の構成(例えば特許文献2に開示された構成)によると、ドレイン電極と共通電極とを接続するコンタクト部と、共通電極と画素電極とを接続するコンタクト部とを別個に形成する必要があり、コンタクト部に要する面積を小さくできないという問題がある。
コンタクト部105(1)~105(3)を形成する際には、ドレイン電極11dの表面の一部または全部をドレイン接続透明導電層15aで覆った状態で誘電体層17の形成までを行うことができる。このようなプロセスを用いると、第1コンタクトホールCH1の底面全体にドレイン電極11dを露出した状態で誘電体層17を形成する場合と比べて、ドレイン電極11dの露出面積を小さくできるので、ドレイン電極11dの表面に生じるプロセスダメージを低減できる。この結果、より低抵抗で安定したコンタクト部105を形成できる。特に、コンタクト部105(2)および105(3)の構成によると、ドレイン接続透明導電層15aでドレイン電極11dの露出表面全体を覆った状態で誘電体層17の形成までを行うことができる。このため、ドレイン電極11dの表面に生じるプロセスダメージをより効果的に低減できる。
コンタクト部105(1)~105(3)では、基板1の法線方向から見たとき、TFT101のドレイン電極11dとドレイン接続透明導電層15aまたは第2透明導電層19aとが接するコンタクト部105は、ゲート配線層(ゲート配線3や下部導電層3c)と重なるように配置されていることが好ましい。これにより、コンタクト部105による開口率の低下を従来よりも抑えることが可能となり、高透過率化を実現できる。
本実施形態では、補助容量配線を設けてその上に補助容量を形成してもよいが、補助容量配線自体を設けなくてもよい。その場合、第2透明導電層19aの少なくとも一部を、誘電体層17を介して第1透明導電層15と重なるように配置することにより、容量を形成できる。この容量は補助容量として機能できる。誘電体層17の材料および厚さ、容量を形成する部分の面積などを適宜調整することにより、所望の容量を有する補助容量が得られる。このように、画素内に、例えばソース配線と同じ金属膜などを利用して補助容量を別途形成する必要がないので有利である。従って、金属膜を用いた補助容量の形成による開口率の低下を抑制できる。
図6Aおよび図6Bは、それぞれ本実施形態におけるS-G接続部形成領域103Rの一部を示す平面図および断面図である。
ここで、本実施形態の半導体装置100を用いた液晶表示装置の構成を説明する。図7は、本実施形態の液晶表示装置1000を例示する図である。
以下、図面を参照しながら、本実施形態の半導体装置100の製造方法の一例を説明する。
まず、基板1上に、図示しないゲート配線用金属膜(厚さ:例えば50nm~500nm)を形成する。ゲート配線用金属膜は、基板1の上にスパッタ法などによって形成される。
次に、図9A(b)および図9B(b)に示すように、基板1上に、ゲート電極3a、下部導電層3c、下部導電層3t、3sgを覆うように、ゲート絶縁層5を形成する。この後、ゲート絶縁層5の上に半導体膜を形成し、これをパターニングする。これにより、トランジスタ形成領域101Rに半導体層7aを形成し、端子部形成領域102Rに半導体層7tを形成する。半導体層7aは、少なくとも一部がゲート電極3aと重なるように配置される。また、半導体層7tは下部導電層3tの上に開口部7qを有している。基板1の法線方向から見たとき、半導体層7tの開口部7qは、下部導電層3tの輪郭の内部に位置することが好ましい。図示するように、S-G接続部形成領域103Rでは、半導体膜は除去されてもよい。
次に、半導体層7a、7tおよびゲート絶縁層5の上に、保護層(厚さ:例えば30nm以上200nm以下)9を形成する。続いて、レジストマスク(図示せず)を用いて、保護層9のエッチングを行う。このとき、保護層9がエッチングされ、かつ、半導体層7a、7tおよびゲート絶縁層5がエッチングされないように、各層の材料に応じて、エッチング条件が選択される。ここでいうエッチング条件とは、ドライエッチングを用いる場合、エッチングガスの種類、基板1の温度、チャンバー内の真空度などを含む。また、ウェットエッチングを用いる場合、エッチング液の種類やエッチング時間などを含む。
次に、保護層9の上、および開口部9p、9w、9r、9q内に、ソース配線用金属膜(厚さ:例えば50nm~500nm)を形成する。ソース配線用金属膜は、例えばスパッタ法などによって形成される。
次に、図10A(e)および図10B(e)に示すように、基板1の上に、第1絶縁層12および第2絶縁層13をこの順で形成する。これらの絶縁層12、13は層間絶縁層14を構成する。本実施形態では、第1絶縁層12として、例えばCVD法により、無機絶縁層(パッシベーション膜)を形成する。次いで、第1絶縁層12の上に、第2絶縁層13として、例えば有機絶縁層を形成する。この後、第2絶縁層13のパターニングを行い、第2絶縁層13のうち上部導電層11c上に位置する部分と、上部導電層11sgおよび下部導電層3sg上に位置する部分とに開口部を設ける。また、端子部形成領域102Rでは、第2絶縁層13を除去する。
次に、第2絶縁層13上、コンタクトホールCH1、CH2内、および開口部14rA、14rB内に、例えばスパッタ法により透明導電膜(図示せず)を形成し、これをパターニングする。パターニングには、公知のフォトリソグラフィを用いることができる。
次に、基板1の表面全体を覆うように、例えばCVD法により、誘電体層17を形成する。次いで、誘電体層17の上にレジストマスク(図示せず)を形成し、誘電体層17のエッチングを行う。
続いて、誘電体層17の上、開口部17p、17r内、および第2コンタクトホールCH2内に、例えばスパッタ法により透明導電膜(図示せず)を形成し、これをパターニングする。パターニングには、公知のフォトリソグラフィを用いることができる。
以下、本発明による半導体装置の実施形態2を説明する。
以下、本発明による半導体装置の実施形態3を説明する。実施形態3は、前述した実施形態1と、端子部のコンタクトホールの周辺(周囲)に誘電体層を有する点で異なっている。TFTおよびS-G接続部の構造は実施形態1と同様であるので、説明を省略する。
まず、図9A、図9Bおよび図10A、図10Bに示す工程と同様に、基板1上に、ゲート配線、半導体層、保護層、ソース・ドレイン、層間絶縁層および第1透明導電層の形成を行う。
次に、基板1の表面全体を覆うように、例えばCVD法により、誘電体層17を形成する。この後、誘電体層17の上にレジストマスク(図示せず)を形成し、誘電体層17のエッチングを行う。これにより、図17(a)に示すように、トランジスタ形成領域101Rでは、誘電体層17に、ドレイン接続透明導電層15aを露出する開口部17pが形成される。S-G接続部形成領域103Rでは、誘電体層17に、下部透明導電層15sgを露出する開口部17rが形成される。この例では、下部透明導電層15sgのうち開口部14rA、14rB内に位置する部分全体が露出するように開口部17rが形成されている。また、端子部形成領域102Rでは、第2コンタクトホールCH2の周辺(周囲)において、下部透明接続層15tの上に誘電体層17tが形成される。誘電体層17tは、基板1の法線方向から見たとき、半導体層7tの少なくとも一部と重なるように配置される。
続いて、誘電体層17の上、開口部17p、17r内、および第2コンタクトホールCH2内に、例えばスパッタ法により透明導電膜(図示せず)を形成し、これをパターニングする。これにより、図17(b)に示すように、トランジスタ形成領域101Rでは、第2透明導電層19aが形成される。S-G接続部形成領域103Rでは、開口部17r内で下部透明導電層15sgと接する上部透明導電層19sgが得られる。端子部形成領域102Rでは、透明導電膜から、端子部102の上部透明接続層19tが形成される。上部透明接続層19tは、第2コンタクトホールCH2内において、下部透明接続層15tと接している。また、誘電体層17tの少なくとも一部は、上部透明接続層19tと下部透明接続層15tとの間に位置している。なお、上部透明接続層19tの端部は、図17(b)に示すように、誘電体層17t上に位置してもよい。あるいは、図16(b)に示すように、ゲート絶縁層5上に位置し、誘電体層17tの上面全体、および誘電体層17tの第2コンタクトホールCH2と反対側の側面を覆っていてもよい。
以下、本発明による半導体装置の実施形態4を説明する。実施形態4におけるTFTおよびS-G接続部は、前述した実施形態2におけるTFTおよびS-G接続部と同様の構成を有するが、端子部は実施形態3における端子部と同様の構造を有する。従って、本実施形態の半導体装置の構成の説明を省略する。
3、G ゲート配線
3a ゲート電極
3c 下部導電層
3t、3sg 下部導電層
5 ゲート絶縁層
7a、7c、7t 半導体層
9 保護層
11、S ソース配線
11s ソース電極
11d ドレイン電極
11t、11sg 上部導電層
12 第1絶縁層
13 第2絶縁層
14 層間絶縁層
15 第1透明導電層
15a ドレイン接続透明導電層
15t 下部透明接続層
17、17t 誘電体層
19a 第2透明導電層
19t 上部透明接続層
100 半導体装置
101 TFT
102、202 端子部
103 S-G接続部
105 コンタクト部
1000 液晶表示装置
Claims (15)
- 基板と、前記基板に支持された薄膜トランジスタ、ゲート配線層、ソース配線層および端子部とを備え、
前記ゲート配線層は、ゲート配線と、前記薄膜トランジスタのゲート電極と、前記端子部の下部導電層とを含み、
前記ソース配線層は、ソース配線と、前記薄膜トランジスタのソース電極およびドレイン電極とを含み、
前記薄膜トランジスタは、前記ゲート電極と、前記ゲート電極の上に形成されたゲート絶縁層と、前記ゲート絶縁層の上に形成され、酸化物半導体を含む第1半導体層と、少なくとも前記第1半導体層のチャネル領域を覆う保護層と、前記ソース電極と、前記ドレイン電極とを有する、半導体装置であって、
前記ソース電極及び前記ドレイン電極の上に形成され、少なくとも前記ドレイン電極の表面と接する第1絶縁層を含む層間絶縁層と、
前記層間絶縁層の上に形成された第1透明導電層と、
前記第1透明導電層上に形成された第1誘電体層と
前記第1誘電体層上に、前記第1誘電体層を介して前記第1透明導電層の少なくとも一部と重なるように形成された第2透明導電層と
をさらに備え、
前記端子部は、前記下部導電層と、前記下部導電層上に延設された前記ゲート絶縁層と、前記ゲート絶縁層上に配置され、前記第1半導体層と同一の半導体膜から形成された第2半導体層と、前記第1透明導電層と同一の導電膜から形成された下部透明接続層と、前記下部透明接続層上に配置され、前記第2透明導電層と同一の導電膜から形成された上部透明接続層とを備え、
前記ゲート絶縁層および前記第2半導体層はコンタクトホールを有し、前記ゲート絶縁層の前記コンタクトホール側の側面と、前記第2半導体層の前記コンタクトホール側の側面とは整合しており、
前記下部透明接続層は、前記コンタクトホール内および前記第2半導体層上に形成され、前記コンタクトホール内で前記下部導電層と接しており、
前記上部透明接続層は、前記コンタクトホールの底面および側壁において、前記下部透明接続層と接している半導体装置。 - 前記下部透明接続層の側面は、前記第2半導体層の前記コンタクトホールと反対側の側面と整合している請求項1に記載の半導体装置。
- 前記上部透明接続層の端部は、前記下部透明接続層上にある請求項1または2に記載の半導体装置。
- 前記上部透明接続層は、前記第2半導体層の前記コンタクトホールと反対側の側面を覆っている請求項1または2に記載の半導体装置。
- 前記上部透明接続層と前記下部透明接続層との間に、前記第1誘電体層と同一の誘電体膜から形成された第2誘電体層をさらに有している請求項1または2に記載の半導体装置。
- 前記第2誘電体層は、前記半導体層の前記コンタクトホールと反対側の側面を覆っている請求項5に記載の半導体装置。
- 請求項1から6のいずれかに記載の半導体装置と、
前記半導体装置と対向するように配置された対向基板と、
前記対向基板と前記半導体装置との間に配置された液晶層と
を備え、
マトリクス状に配置された複数の画素を有し、
前記第2透明導電層は、画素毎に分離され、画素電極として機能する表示装置。 - 前記第2透明導電層は、画素内に、スリット状の複数の開口部を有し、
前記第1透明導電層は、少なくとも前記複数の開口部の下方に存在し、共通電極として機能する請求項7に記載の表示装置。 - 薄膜トランジスタおよび端子部を備える半導体装置を製造する方法であって、
(a)基板上に、下部導電層、ゲート配線およびゲート電極を含むゲート配線層を形成する工程と、
(b)前記ゲート配線層を覆うゲート絶縁層を形成する工程と、
(c)前記ゲート絶縁層上に酸化物半導体膜を形成し、これをパターニングすることにより、少なくとも一部が前記ゲート電極と重なる第1半導体層と、前記下部導電層の上方に第1開口部を有する第2半導体層とを形成する工程と、
(d)前記第1半導体層のチャネル領域となる領域および前記第2半導体層の上面を少なくとも覆う保護層を形成する工程と、
(e)前記保護層が形成された前記基板の表面に導電膜を形成し、これをパターニングすることにより、前記第1半導体層に接するソース電極およびドレイン電極を含むソース配線層を形成する工程と、
(f)前記ソース配線層が形成された前記基板の表面に第1絶縁膜を形成し、前記第1絶縁膜、前記ゲート絶縁層および前記保護層のエッチングを同時に行う工程であって、前記保護層のうち前記第2半導体層上に位置する部分を除去し、かつ、前記第2半導体層をエッチングマスクとして、前記第1絶縁膜および前記ゲート絶縁層を除去して前記下部導電層を露出させる工程を含み、これにより、前記第2半導体層および前記ゲート絶縁層にコンタクトホールを形成する、工程と、
(g)前記コンタクトホール内および前記第2半導体層上に、前記コンタクトホール内で前記下部導電層と接する下部透明接続層を形成する工程と、
(h)前記下部透明接続層上に、前記コンタクトホールの底面および側面において前記下部透明接続層と接するように上部透明接続層を形成する工程と
を包含する半導体装置の製造方法。 - 前記工程(g)は、前記コンタクトホール内および前記第2半導体層上に透明導電膜を形成する工程と、前記透明導電膜および前記第2半導体層を同時にエッチングする工程を含む請求項9に記載の半導体装置の製造方法。
- 前記工程(g)と前記工程(f)との間に、前記下部透明導電層の一部上に誘電体層を形成する工程をさらに含み、
前記工程(f)において、前記上部透明接続層は、前記下部透明導電層および前記誘電体層と接するように形成される請求項9または10に記載の半導体装置の製造方法。 - 基板と、前記基板に支持された端子部とを備える半導体装置であって、
前記端子部は、
前記基板上に形成された下部導電層と、
前記下部導電層を覆う絶縁層と、
前記絶縁層上に形成された酸化物半導体を含む半導体層と、
下部透明接続層と、
前記下部透明接続層上に配置された透明な上部透明接続層と
を備え、
前記絶縁層および前記半導体層はコンタクトホールを有し、前記絶縁層の前記コンタクトホール側の側面と、前記半導体層の前記コンタクトホール側の側面とは整合しており、
前記下部透明接続層は、前記コンタクトホール内および前記半導体層上に形成され、前記コンタクトホール内で前記下部導電層と接しており、
前記上部透明接続層は、前記コンタクトホールの底面および側壁において、前記下部透明接続層と接している半導体装置。 - 端子部を備える半導体装置を製造する方法であって、
(A)基板上に下部導電層を形成する工程と、
(B)前記下部導電層を覆う絶縁層を形成する工程と、
(C)前記絶縁層上に、前記下部導電層の上方に第1開口部を有する、酸化物半導体を含む半導体層を形成する工程と、
(D)前記半導体層を覆う保護層を形成する工程と、
(E)前記保護層上および前記第1開口部内に第1絶縁膜を形成する工程と、
(F)前記第1絶縁膜、前記絶縁層および前記保護層のエッチングを同時に行う工程であって、前記保護層を除去し、かつ、前記半導体層をエッチングマスクとして、前記第1絶縁膜および前記絶縁層を除去して、前記下部導電層の一部を露出させる工程を含み、これにより、前記絶縁層および前記半導体層にコンタクトホールを形成する、工程と、
(G)前記コンタクトホール内および前記半導体層上に、前記コンタクトホール内で前記下部導電層と接する下部透明接続層を形成する工程と、
(H)前記下部透明接続層上に、前記コンタクトホールの底面および側面において前記下部透明接続層と接するように上部透明接続層を形成する工程と
を包含する半導体装置の製造方法。 - 前記酸化物半導体はIn-Ga-Zn-O系の半導体を含む請求項1から6および12のいずれかに記載の半導体装置。
- 前記酸化物半導体はIn-Ga-Zn-O系の半導体を含む請求項13に記載の半導体装置の製造方法。
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