WO2014017406A1 - 半導体装置およびその製造方法 - Google Patents
半導体装置およびその製造方法 Download PDFInfo
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- WO2014017406A1 WO2014017406A1 PCT/JP2013/069677 JP2013069677W WO2014017406A1 WO 2014017406 A1 WO2014017406 A1 WO 2014017406A1 JP 2013069677 W JP2013069677 W JP 2013069677W WO 2014017406 A1 WO2014017406 A1 WO 2014017406A1
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- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/78606—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device
- H01L29/78618—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device characterised by the drain or the source properties, e.g. the doping structure, the composition, the sectional shape or the contact structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02123—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon
- H01L21/02164—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material being a silicon oxide, e.g. SiO2
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02123—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon
- H01L21/0217—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material being a silicon nitride not containing oxygen, e.g. SixNy or SixByNz
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/0226—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process
- H01L21/02263—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase
- H01L21/02271—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition
- H01L21/02274—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition in the presence of a plasma [PECVD]
Definitions
- the present invention relates to a semiconductor device (for example, an active matrix substrate) manufactured using an oxide semiconductor and a manufacturing method thereof.
- An active matrix substrate used for a liquid crystal display device or the like includes a switching element such as a thin film transistor (hereinafter, “TFT”) for each pixel.
- a switching element such as a thin film transistor (hereinafter, “TFT”) for each pixel.
- TFT thin film transistor
- amorphous silicon TFT a TFT having an amorphous silicon film as an active layer
- polycrystalline silicon TFT a TFT having a polycrystalline silicon film as an active layer
- Patent Document 1 describes a liquid crystal display device in which an active layer of a TFT is formed using an oxide semiconductor film such as InGaZnO (oxide composed of indium, gallium, and zinc). Such a TFT is referred to as an “oxide semiconductor TFT”.
- oxide semiconductor TFT can be operated at a higher speed than an amorphous silicon TFT.
- oxide semiconductor film is formed by a simpler process than the polycrystalline silicon film, the oxide semiconductor film can be applied to a device that requires a large area. For this reason, oxide semiconductor TFTs are being used for display devices and the like as active elements that can be manufactured while suppressing the number of manufacturing steps and manufacturing costs and that perform higher-performance switching operations.
- the electron mobility of the oxide semiconductor is high, even if the size is reduced as compared with the conventional amorphous silicon TFT, it is possible to obtain the same or higher performance. Therefore, when an oxide semiconductor TFT is used, the area occupied by the TFT in the pixel region of a display device or the like can be reduced, and as a result, the pixel aperture ratio can be improved. Therefore, display with higher luminance can be performed, or power consumption can be reduced by suppressing the light amount of the backlight.
- heat treatment is performed at a relatively high temperature (for example, about 300 ° C. or higher) in order to improve element characteristics.
- This heat treatment is often performed after forming a passivation layer (protective layer) provided so as to cover the oxide semiconductor layer and the source / drain electrodes. If the source / drain electrodes are covered with the passivation layer, the surface of the source / drain electrodes is difficult to be oxidized during the heat treatment, thereby preventing a high resistance.
- Patent Document 2 discloses a technique for forming a passivation layer having a multilayer structure by alternately depositing an insulator containing nitrogen such as silicon oxynitride and an insulator containing nitrogen and fluorine. .
- the passivation layer provided so as to cover the TFT may contain a relatively large amount of hydrogen.
- SiNx silicon nitride
- NH 3 gas a source gas
- the amount of hydrogen contained in the formed silicon nitride film becomes relatively large.
- the TFT characteristics may be deteriorated due to diffusion of hydrogen into the oxide semiconductor layer.
- the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a semiconductor device having good characteristics stably and with a high yield.
- a semiconductor device includes a substrate, a gate electrode formed on the substrate, a gate insulating layer formed on the gate electrode, and an oxidation formed on the gate insulating layer.
- a semiconductor device comprising: a physical semiconductor layer; a source electrode and a drain electrode electrically connected to the oxide semiconductor layer; and an insulating layer formed on the source electrode and the drain electrode.
- the layer is in contact with at least a part of the upper surfaces of the source electrode and the drain electrode, and has a silicon nitride layer having a thickness of more than 0 nm and not more than 30 nm, and a thickness exceeding 30 nm formed on the silicon nitride layer. And a silicon oxide layer.
- the silicon oxide layer has a thickness of 50 nm to 400 nm.
- the upper surface of the source electrode and the drain electrode and the surface in contact with the silicon nitride layer is made of a conductive material containing at least one element selected from the group consisting of Mo, Ti, Cu, and Al. Is formed.
- the contact surfaces of the source electrode and the drain electrode are made of molybdenum nitride.
- the semiconductor device further includes an etching stopper layer formed on a channel region of the oxide semiconductor layer.
- the oxide semiconductor layer is an In—Ga—Zn—O-based semiconductor layer.
- a method of manufacturing a semiconductor device includes: (a) preparing a substrate; (b) forming a gate electrode on the substrate; and insulating the gate electrode on the substrate.
- step (e) includes forming a first insulating region containing nitrogen with a thickness greater than 0 nm and less than or equal to 30 nm so as to be in contact with the source electrode and the drain electrode;
- First On the insulating region comprises a step of forming a second insulating region containing oxygen 30nm greater in thickness.
- the first insulating region is formed by a silicon nitride layer
- the second insulating region is formed by a silicon oxide layer.
- the step (d) includes a step of forming surfaces of the source electrode and the drain electrode from a conductive material containing at least one element selected from the group consisting of Mo, Ti, Cu, and Al. Wrap.
- the step of forming the silicon nitride layer in the step (e) is performed by a plasma CVD method using a source gas containing SiH 4 gas and NH 3 gas.
- a TFT substrate including an oxide semiconductor TFT having good element characteristics can be manufactured with a high yield.
- FIG. 3 is a plan view showing a TFT substrate of Embodiment 1.
- FIG. 3A is a cross-sectional view taken along line A-A ′ in FIG. 2
- FIG. 4B is a cross-sectional view taken along line D-D ′ in FIG. 2.
- FIG. 4 is a cross-sectional view showing a manufacturing process of the TFT substrate of Embodiment 1, wherein (a) to (e) show different processes.
- FIG. 4 is a cross-sectional view showing a manufacturing process of the TFT substrate of Embodiment 1, and (f) to (i) show different processes, respectively.
- FIG. 6 is a cross-sectional view showing a manufacturing process of the TFT substrate of Embodiment 1, wherein (j) to (l) show different processes.
- 10 is a plan view showing a TFT substrate of Embodiment 2.
- FIG. 8A is a cross-sectional view taken along the line A-A ′ in FIG. 7, and
- FIG. 8B is a cross-sectional view taken along the line D-D ′ in FIG. 7.
- FIG. 10 is a cross-sectional view showing a manufacturing process of the TFT substrate of Embodiment 2, wherein (a) to (e) show different processes.
- FIG. 10 is a cross-sectional view showing a manufacturing process of the TFT substrate of Embodiment 2, and (f) to (j) show different processes, respectively.
- FIG. 1A shows a semiconductor device 900 of Comparative Example 1 (here, a TFT substrate used for a liquid crystal display device).
- the TFT substrate 900 includes a substrate 10, and an oxide semiconductor layer 18 is provided on the substrate 10 so as to overlap the gate electrode 12 with the gate electrode 12 and the gate insulating film 20 interposed therebetween.
- a source electrode 14 and a drain electrode 16 are connected to the oxide semiconductor layer 18, and a TFT (oxide semiconductor TFT) 95 is formed by these.
- the TFT 95 is covered with a passivation layer 92 provided as a protective layer.
- the TFT substrate 900 is provided with an upper transparent electrode 30 connected to the drain electrode 16 of the TFT 95, and a lower transparent electrode 32 disposed below the dielectric layer 26. Then, explanation is omitted.
- the passivation layer 92 is formed of a SiNx film (silicon nitride film), and typically has a thickness of 100 to 400 nm. Since the SiNx film is a dense film, it is suitable for protecting the TFT 95.
- SiNx film silicon nitride film
- the passivation layer 92 is formed of a silicon nitride film
- hydrogen contained in the silicon nitride film may diffuse into the oxide semiconductor layer 18 during heat treatment or the like.
- SiH 4 gas monosilane gas
- NH 3 NH 3
- Hydrogen affects the channel region (back channel side) of the oxide semiconductor layer 18.
- a threshold shift (a change in TFT characteristics) occurs after an aging process performed after the module is manufactured. Therefore, when a display panel is configured using the TFT substrate 900, the panel display quality is deteriorated due to the occurrence of off-leakage or the shortage of on-current. Therefore, it is preferable that hydrogen is not diffused into the oxide semiconductor layer 18 as much as possible.
- etching stopper layer 21 functions to prevent the etching from progressing to the oxide semiconductor layer 18 in the step of forming the source and drain electrodes 14 and 16 by etching the conductive film.
- the etching stopper layer 21 is formed from an oxide (for example, SiO 2 )
- diffusion of hydrogen from the passivation layer 92 to the oxide semiconductor layer 18 can be suppressed. Accordingly, the reduction reaction in the back channel of the oxide semiconductor layer 18 is suppressed, so that deterioration of TFT characteristics can be prevented.
- the configuration in which the etching stopper layer 21 is provided in this way is called “channel protection type (or etch stopper type)” (described later).
- the passivation layer 92 contains a large amount of hydrogen because it may lead to deterioration of element characteristics.
- the etching stopper layer 21 is provided, there is a problem that an extra manufacturing process is required.
- Patent Document 1 discloses that the protective layer of the oxide semiconductor TFT is formed from an oxide.
- the passivation layer 94 is formed of an SiO 2 film, an etching stopper layer that covers the channel region of the oxide semiconductor layer 18 is provided. Absent. That is, on the TFT substrate 902, a “channel etch type” TFT 96 (described later) is formed instead of the above-described channel protection type TFT.
- the present inventors have confirmed the following. That is, when the passivation layer 94 is formed of an oxide film such as SiO 2 , the surfaces of the source / drain electrodes 14 and 16 are easily oxidized during the subsequent heat treatment. This is because an oxidation-reduction reaction between the metal and the oxide film occurs at the interface between the source / drain electrodes 14 and 16 and the passivation layer 94. When the oxide film is formed on the surfaces of the source / drain electrodes 14 and 16 in this way, the adhesion of the passivation layer 94 may be lowered. As a result, the passivation layer 94 may be peeled off in a subsequent process or the like, which causes a decrease in yield.
- an oxide film such as SiO 2
- the surfaces of the source / drain electrodes 14 and 16 are easily oxidized during the subsequent heat treatment. This is because an oxidation-reduction reaction between the metal and the oxide film occurs at the interface between the source / drain electrodes 14 and 16 and the passivation layer 94.
- the surface of the source / drain electrodes 14 and 16 is formed of a metal material (for example, MoN) containing Mo, Ti, Cu, Al, etc.
- a metal oxide film is formed on the surface, The SiO 2 film on the source / drain electrodes 14 and 16 is easily peeled off.
- a thin silicon nitride layer (for example, SiN film) 22a of 30 nm or less so as to be in contact with the surface of the source / drain electrodes 14 and 16 is formed. It has been found that it is preferable to provide a silicon oxide layer (for example, SiO 2 film) 22b thereon.
- the present inventor has found that a decrease in the adhesion of the passivation layer 22 can be sufficiently prevented by merely interposing a thin silicon nitride layer of 30 nm or less, thereby keeping the device characteristics of the oxide semiconductor TFT high. As a result, it was possible to prevent film peeling due to a decrease in adhesion of the passivation film 22.
- the semiconductor device according to the embodiment of the present invention only needs to include a thin film transistor (oxide semiconductor TFT) having an active layer made of an oxide semiconductor, and widely includes an active matrix substrate, various display devices, electronic devices, and the like.
- a thin film transistor oxide semiconductor TFT
- an active matrix substrate various display devices, electronic devices, and the like.
- an oxide TFT having a bottom gate structure in which a gate electrode is present under the oxide semiconductor layer will be described.
- a source and drain electrodes are usually formed by etching a conductive layer formed on an oxide semiconductor layer (source / drain separation step).
- the conductive layer may be etched in a state where the channel region of the oxide semiconductor layer is covered with the protective film (the above-described etching stopper layer 21). it can.
- the TFT thus obtained is referred to as a “channel protection type (or etch stopper type)”.
- a TFT obtained by etching a conductive layer without covering the channel portion with a protective film is referred to as a “channel etch type”.
- Embodiment 1 a semiconductor device including a channel protection type TFT will be described, and in Embodiment 2, a semiconductor device including a channel etch type TFT will be described.
- FIGS. 3A and 3B show the semiconductor device 100 of the first embodiment.
- the semiconductor device 100 is a TFT substrate (active matrix substrate) 100 used in a liquid crystal display device.
- FIG. 2 schematically shows an example of the planar structure of the TFT substrate 100.
- FIGS. 3A and 3B are cross sections taken along the line AA ′ and along the line DD ′ in FIG. Each cross section is shown.
- the TFT substrate 100 includes a display area (active area) 120 that contributes to display, and a peripheral area (frame area) 110 located outside the display area 120.
- a plurality of gate lines 2 and a plurality of source lines 4 are provided, and each area surrounded by these lines becomes a “pixel”.
- the plurality of pixels are arranged in a matrix, and in each pixel, a thin film transistor (TFT) 5 that is an active element is arranged near each intersection of the plurality of gate wirings 2 and the plurality of source wirings 4.
- TFT thin film transistor
- a pixel electrode 30 provided for each pixel is connected to the TFT 5, and display can be performed by controlling a voltage applied to the pixel electrode 30.
- terminal portions 2T and 4T for electrically connecting the gate wiring 2 or the source wiring 4 and the external wiring are formed.
- the gate wiring terminal portion 2T and the source wiring terminal portion 4T are connected to a gate driver and a source driver (both not shown) provided outside the TFT substrate 100 via external wiring, FPC, and the like.
- the TFT substrate 100 overlaps the gate electrode 12 on the substrate 10, the gate insulating layer 20 covering the gate electrode 12, and the gate electrode 12 through the gate insulating layer 20.
- an oxide semiconductor layer for example, an In—Ga—Zn—O-based semiconductor layer
- an etching stopper layer 21 is formed on the oxide semiconductor layer 18, and the source electrode 14 and the drain electrode 16 are separated from each other through an opening 21 h provided in the etching stopper layer 21.
- the oxide semiconductor layer 18 is connected.
- the TFT 5 is composed of these members. When an on-voltage is applied to the gate electrode 12, the TFT 5 is turned on, and the source electrode 14 and the drain electrode 16 are conducted through the channel region of the oxide semiconductor layer 18.
- the source and drain electrodes 14 and 16 have a three-layer structure of MoN / Al / MoN.
- the lowermost MoN layers 14 a and 16 a are layers in contact with the oxide semiconductor layer 18.
- Al layers 14b and 16b are provided as intermediate layers, and the uppermost MoN layers 14c and 16c provided thereon are layers constituting the surfaces of the source and drain electrodes 14 and 16, respectively.
- the uppermost MoN layers 14c and 16c are in contact with a passivation layer 22 described later.
- a passivation layer 22 is formed as a protective insulating layer covering the TFT 5.
- the passivation layer 22 is provided on the lower insulating layer 22a and the lower insulating layer 22a provided in contact with the source and drain electrodes 14, 16 (more specifically, the uppermost MoN layers 14c, 16c). And an upper insulating layer 22b.
- the lower insulating layer 22a is formed from a silicon nitride (SiNx) layer having a thickness of more than 0 nm and not more than 30 nm
- the upper insulating layer 22b is formed from a silicon oxide layer (SiOx) having a thickness exceeding 30 nm. ing.
- the lower insulating layer 22a is formed of a silicon nitride layer, it typically contains hydrogen. However, the thickness of the lower insulating layer 22a is 0 to 30 nm as described above, which is much thinner than the thickness of the generally formed passivation layer 22 (for example, 100 to 400 nm). For this reason, the amount of hydrogen contained in the lower insulating layer 22a is sufficiently small as compared with the conventional case where the passivation layer is composed of a single SiNx layer.
- the upper insulating layer 22b formed on the lower insulating layer 22a is formed of a SiOx layer having a lower hydrogen content than the lower insulating layer 22b. Therefore, the hydrogen content of the passivation layer 22 is not large as a whole.
- the passivation layer 22 has a configuration in which the lower insulating layer 22a and the upper insulating layer 22b are stacked, and the hydrogen content thereof is not uniform in the thickness direction.
- a region having a relatively high hydrogen content is formed in a region near the source and drain electrodes 14, 16, and a hydrogen content is relatively low in a region away from the source and drain electrodes 14, 16. Less regions are formed.
- the lower insulating layer 22a in contact with the source / drain electrodes 14 and 16 is formed of a silicon insulating layer having a high nitrogen concentration (or containing nitrogen and not containing oxygen),
- the upper insulating layer 22b is formed of a silicon-based insulating layer having a high oxygen concentration (or containing oxygen and not containing nitrogen).
- the passivation layer 22 may include a silicon oxynitride (SiOxNy: where x> y) layer or a silicon nitride oxide (SiNxOy: where x> y) layer.
- the passivation layer 22 is preferably configured such that the closer to the source / drain electrodes 14, 16, the higher the nitrogen concentration.
- the passivation layer 22 does not need to be composed of two layers as described above, and may be composed of three or more layers.
- an interlayer insulating layer 24 typically formed from an organic resin material, is formed on the passivation layer 22.
- the interlayer insulating layer 24 functions as a layer that ensures interlayer insulation and planarizes the substrate surface.
- a lower transparent electrode 32 made of ITO, IZO or the like is provided on the interlayer insulating layer 24.
- the lower transparent electrode 32 has an opening 32H and is formed so as to be electrically insulated from the TFT 5 (or the drain electrode 16).
- an upper transparent electrode 30 made of ITO, IZO or the like is formed on the lower transparent electrode 32 through a dielectric layer (insulating layer) 26.
- the lower transparent electrode 32 functions as a common electrode, for example.
- the upper transparent electrode 30 functions as a pixel electrode, for example.
- a storage capacitor is formed by the lower transparent electrode 32, the upper transparent electrode 30, and the dielectric layer 26 sandwiched therebetween. As described above, when the auxiliary capacitance is formed by using the lower transparent electrode 32, it is not necessary to provide the auxiliary capacitance wiring in the same layer as the gate wiring 2, so that the aperture ratio can be improved.
- a contact hole CH reaching the surface of the drain electrode 16 of the TFT 5 (or a drain contact portion 16 'as an extension of the drain electrode 16) is formed.
- a transparent connection portion 32 ⁇ / b> C disposed in the contact hole CH is provided inside the opening portion 32 ⁇ / b> H of the lower layer transparent electrode 32 so as to be independent of the lower layer transparent electrode 32.
- the drain electrode 16 and the upper transparent electrode (pixel electrode) 30 are electrically connected through the transparent connection portion 32C in the contact hole CH.
- the peripheral region 110 of the TFT substrate 100 is provided with a gate wiring terminal portion 2T formed in the same process as the gate electrode 12 and the gate wiring 2.
- the gate wiring terminal portion 2T is a transparent connection in the same layer as the lower transparent electrode 32 in a contact hole that penetrates the gate insulating film 20, the etching stopper layer 21, the passivation layer 22, the interlayer insulating layer 24, and the dielectric layer 26.
- the upper transparent electrode 30 is connected to the transparent connection terminal portion 30T in the same layer as the portion 32T.
- the TFT substrate 100 configured as described above is used in a liquid crystal display device, and a liquid crystal display device can be obtained by sealing and holding a liquid crystal layer between the TFT substrate 100 and a counter substrate (not shown). it can.
- FIGS. 4A to 4E, FIGS. 5F to 5I, and FIGS. 6J to 6L show the manufacturing process of the TFT substrate 100.
- FIG. 3A Note that, on the left side of the figure, an area in the vicinity of the TFT shown in FIG. 3A is shown, and on the right side of the figure, an area in the vicinity of the terminal portion shown in FIG. 3B is shown.
- a substrate 10 is prepared.
- a glass substrate, a silicon substrate, a heat-resistant plastic substrate, a resin substrate, or the like can be used.
- the plastic substrate or the resin substrate include substrates made of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethersulfone (PES), acrylic, polyimide, and the like.
- a conductive film for forming the gate wiring 12 and the like is formed on the substrate 10 to a thickness of 50 nm to 300 nm.
- a metal such as aluminum (Al), tungsten (W), molybdenum (Mo), tantalum (Ta), chromium (Cr), titanium (Ti), copper (Cu), or an alloy thereof, or metal nitriding thereof
- a film containing an object can be used as appropriate.
- a laminated film in which these plural films are laminated may be used.
- a laminated conductive film (thickness: about 100 nm (MoNb) / 200 nm (Al)) having aluminum (Al) as a lower layer and molybdenum niobium alloy (MoNb) as an upper layer is formed by sputtering, and resist is formed.
- a gate electrode 12 is obtained by patterning this conductive film into a desired shape by photolithography using a mask. In this step, the gate wiring 2 and the gate wiring terminal portion 2T (see FIG. 2) are also formed.
- the gate insulating layer 20 includes a silicon oxide (SiO x ) layer, a silicon nitride (SiN x ) layer, a silicon oxynitride (SiO x N y (x> y)) layer, and a silicon nitride oxide (SiN x O y (x> y) )) It can be formed by a plasma CVD method or the like using an appropriate layer.
- the gate insulating layer 20 may have a multilayer structure.
- a silicon nitride layer or a silicon nitride oxide layer is provided as a lower gate insulating layer, and a silicon oxide layer or a silicon oxynitride layer is provided as an upper gate insulating layer thereon. May be.
- a rare gas element such as argon may be included in the reaction gas and the gate insulating layer may be mixed with the rare gas element.
- a silicon nitride layer having a thickness of 100 nm to 400 nm is formed by plasma CVD using SiH 4 and NH 3 as reaction gases.
- an oxide semiconductor film is formed on the gate insulating layer 20 to a thickness of 30 to 100 nm by a sputtering method, and this is etched using a resist mask in a photolithography process. Then, the oxide semiconductor layer 18 is formed by processing into a desired shape (typically an island shape). Further, after the oxide semiconductor layer 18 is formed, oxygen plasma treatment or the like may be performed on the surface of the oxide semiconductor layer 18.
- the thickness of the oxide semiconductor layer 18 is preferably about 30 nm or more and about 100 nm or less, for example, 50 nm.
- the oxide semiconductor layer 18 is formed by patterning an In—Ga—Zn—O-based amorphous oxide semiconductor film containing In, Ga, and Zn at a ratio of 1: 1: 1.
- the ratio of In, G, and Zn is not limited to the above, and can be appropriately selected.
- the oxide semiconductor layer 18 can be formed using another oxide semiconductor film instead of the In—Ga—Zn—O-based semiconductor film.
- the oxide semiconductor film for example, an InGaO 3 (ZnO) 5 film, a magnesium zinc oxide (Mg x Z n1-x O) film, or a cadmium zinc oxide (Cd x Zn 1-x O) is used.
- a film or a cadmium oxide (CdO) film can be used.
- a ZnO film to which one or more impurity elements of Group 1 element, Group 13 element, Group 14 element, Group 15 element, or Group 17 element are added may be used.
- An impurity element may not be added to the ZnO film.
- the ZnO film may be in an amorphous state, a polycrystalline state, or a microcrystalline state in which an amorphous state and a polycrystalline state are mixed.
- an amorphous In—Ga—Zn—O-based semiconductor film is used as a material for forming the oxide semiconductor layer 18, it can be manufactured at a low temperature and high mobility can be realized.
- an In—Ga—Zn—O-based semiconductor film that exhibits crystallinity with respect to a predetermined crystal axis (C-axis) may be used.
- the uppermost layer of the gate insulating layer 20 (that is, the layer in contact with the oxide semiconductor layer 18) is preferably an oxide layer (for example, a SiO 2 layer). Accordingly, when oxygen vacancies occur in the oxide semiconductor layer 18, the oxygen vacancies can be recovered by oxygen contained in the oxide layer, so that the oxygen vacancies in the oxide semiconductor layer 18 are effectively reduced. it can.
- an insulating film 21 ′ made of, for example, a SiOx film is formed so as to cover the oxide semiconductor layer 18, and then patterned as shown in FIG. 4E.
- the etching stopper layer 21 including a portion covering the channel region of the oxide semiconductor layer 18 is formed.
- the etching stopper layer 21 has a pair of openings 21h arranged corresponding to two opposing sides of the island-shaped oxide semiconductor layer 18 (see FIG. 2).
- the oxide semiconductor layer 18 is exposed in the opening 21h.
- this form is an example and may have other forms.
- the etching stopper layer 21 may be provided in an island shape so as to cover only the channel region of the oxide semiconductor layer 18.
- the gate insulating film 20 and the insulating film 21 ′ on the gate wiring terminal portion 2T are removed by etching, and the surface of the gate wiring terminal portion 2T is exposed. .
- the source electrode 14 and the drain electrode 16 are formed by processing the conductive film formed by sputtering or the like into a desired shape by photolithography.
- the source wiring 4 and the source wiring terminal portion 4T are also formed at the same time.
- the source electrode 14 and the drain electrode 16 are composed of three layers of MoN / Al / MoN (ie, the lowermost MoN layer 14a, 16a: the intermediate Al layer 14b, 16b: the uppermost MoN layer 14c, 16c (three layers) structure.
- the thickness of the lowermost MoN layers 14a and 16a is, for example, 30 nm to 70 nm
- the thickness of the intermediate Al layers 14b and 16b is, for example, 100 nm to 250 nm
- the thickness is, for example, 50 nm to 150 nm.
- the lower MoN layers 14a and 16a preferably have a higher nitrogen content than the upper MoN layers 14c and 16c.
- the conductive material for forming the source electrode 14 and the drain electrode 16 is, for example, a metal such as molybdenum (Mo), copper (Cu), titanium (Ti), aluminum (Al), or an alloy thereof, or metal nitridation thereof. A thing etc. can be used suitably.
- the source electrode 14 and the drain electrode 16 are made of indium tin oxide (ITO), indium zinc oxide (IZO), indium tin oxide containing silicon oxide (ITSO), indium oxide (In 2 O 3 ), tin oxide.
- a layer made of a light-transmitting material such as (SnO 2 ), zinc oxide (ZnO), or titanium nitride may be included.
- the surfaces of the source electrode 14 and the drain electrode 16 are typically formed from a material (for example, MoN) containing Mo, Ti, Cu, and Al.
- the etching process in the photolithography process when forming the source electrode 14 and the drain electrode 16 may be either dry etching or wet etching. However, dry etching with a small shift in line width dimension is suitable for processing a large area substrate. In this etching step, since the etching stopper layer 21 is already provided on the oxide semiconductor layer 18, it is possible to prevent the etching from progressing to the oxide semiconductor layer 18.
- a passivation layer 22 that is an insulating layer as a protective layer is formed so as to cover the TFT 5.
- the step of forming the passivation layer 22 includes a step of forming an insulating region containing nitrogen with a thickness of more than 0 nm and less than or equal to 30 nm so as to be in contact with the source and drain electrodes 14 and 16, and then an insulating region containing oxygen exceeding 30 nm. Forming with a thickness of.
- the step of forming the passivation layer 22 includes a step of forming a silicon nitride layer (lower insulating layer) 22a having a thickness of 30 nm or less, and a silicon oxide layer having a thickness of more than 30 nm (on top thereof) Forming an upper insulating layer) 22b.
- the silicon nitride layer 22a can be formed by, for example, a plasma CVD method using a mixed gas of SiH 4 , NH 3 and N 2 as a reaction gas.
- the silicon oxide layer 22b can be formed by, for example, a plasma CVD method using a mixed gas of SiH 4 and N 2 O as a reaction gas. Note that at least one of the silicon nitride layer 22a and the silicon oxide layer 22b may be formed by a sputtering method.
- the silicon nitride layer 22a is formed to have a thickness of more than 0 nm and not more than 30 nm.
- the thickness of the silicon nitride layer 22a can be easily controlled by adjusting the film formation time.
- the thickness of the silicon nitride layer 22a is more preferably 2 nm or more and 10 nm or less.
- the silicon oxide layer 22b is formed thicker than the silicon nitride layer 22a, and the thickness is preferably 50 nm or more and 400 nm or less, and more preferably 100 nm or more and 300 nm or less.
- the passivation layer 22 may include a silicon oxynitride (SiOxNy: x> y) layer or a silicon nitride oxide (SiNxOy: x> y) layer.
- the passivation layer 22 is preferably configured such that the closer to the source / drain electrodes 14, 16, the higher the nitrogen concentration.
- the passivation layer 22 does not need to be composed of two layers as described above, and may be composed of three or more layers.
- the entire surface of the substrate is heat-treated at about 350 ° C. before the step of forming an interlayer insulating layer 24 described later.
- the element characteristics and reliability of the TFT 5 can be improved. If the heat treatment is performed at this timing, it is possible to prevent the surface of the source / drain electrodes 14 and 16 covered with the passivation layer 22 from being oxidized to increase the wiring resistance.
- oxygen defects when oxygen defects are generated in the channel region of the oxide semiconductor layer 18 by performing the process before forming the interlayer insulating layer 24, the oxygen defects can be easily reduced by oxidizing the oxide defects. Easy to realize the characteristics.
- the silicon nitride layer 22a is in contact with the upper layers 14c and 16c of the source / drain electrodes, it is possible to prevent a metal oxide film from being formed on the surfaces (upper layers 14c and 16c) of the source / drain electrodes. The Thereby, the fall of the adhesiveness of the passivation layer 22 is suppressed.
- the silicon nitride layer 22a is a thin layer and most of the silicon nitride layer 22a is formed from the silicon oxide layer 22b, the hydrogen content in the passivation layer 22 is small, and thus hydrogen affects the back channel of the oxide semiconductor layer 18. The impact is small. Thus, even after aging, the threshold value is hardly shifted in the TFT, and the deterioration of the panel display quality due to the occurrence of off-leakage or insufficient on-current is prevented.
- the temperature of the heat treatment is not particularly limited, but is typically a temperature of 230 ° C. or higher and 480 ° C. or lower, and preferably 250 ° C. or higher and 350 ° C. or lower.
- the heat treatment time is not particularly limited, but is, for example, 30 minutes or longer and 120 minutes or shorter.
- the heat treatment may be performed after the interlayer insulating layer 24 is formed.
- an interlayer insulating layer (planarization layer) 24 formed of a photosensitive resin film or the like is formed on the passivation layer 22.
- the interlayer insulating layer 24 is preferably a layer made of an organic material.
- An opening is formed in the interlayer insulating layer 24. The opening is provided above the drain contact portion 16 ′ as an extension of the drain electrode 16. In the peripheral region, an opening is formed above the gate wiring terminal 2T and the source wiring terminal 4T (not shown).
- the passivation layer 22 is etched using the interlayer insulating layer 24 provided with the opening as a mask, thereby extending the drain electrode 16 (drain contact portion 16 ′). ) Is formed. Further, a contact hole CH1 'reaching the gate wiring terminal portion 2T (and the source wiring terminal portion 2T) is also formed.
- the lower transparent electrode 32 is formed on the interlayer insulating layer 24 by patterning a transparent conductive film made of ITO, IZO or the like.
- the transparent connection portion 32C separated from the lower transparent electrode 32 is formed so as to be in contact with the drain contact portion 16 'exposed inside the contact hole CH1.
- the transparent connection portion 32C may cover the sidewall of the contact hole CH1.
- a transparent connection portion 32T that is in contact with the gate wiring terminal portion 2T (and the source wiring terminal portion 4T) is formed in the contact hole CH1 '.
- the contact hole CH2 is formed so as to overlap the already provided contact hole CH1. Provided on the dielectric layer 26. As a result, a contact hole CH that enables connection with the drain contact portion 16 ′ of the TFT 5 is obtained.
- the dielectric layer 26 is obtained by forming a silicon nitride film or a silicon oxide film having a thickness of 100 nm to 300 nm using a sputtering method or a CVD method.
- a silicon nitride oxide film or a silicon oxynitride film may be used.
- Etching for forming the contact hole CH2 may be performed by a photolithography method.
- an upper transparent electrode (pixel electrode) 30 is formed on the dielectric layer 26 by patterning a transparent conductive film made of ITO, IZO or the like.
- a transparent connection portion 30T connected to the gate wiring terminal portion 2T (and the source wiring terminal portion 4T) is formed in the contact hole CH ′.
- the upper transparent electrode 30 is electrically connected to the drain contact portion 16 'through the transparent connection portion 32C in the contact hole CH.
- the upper transparent electrode 30 is typically formed for each pixel so as to cover the entire region surrounded by the gate wiring 2 and the source wiring 4.
- the TFT substrate 100 thus obtained is suitably used as an active matrix substrate of a liquid crystal display device.
- the shape of the pixel electrode 30 may be appropriately selected according to the display mode.
- the pixel electrode 30 is formed so as to include a plurality of elongated electrodes extending in parallel to each other, and an oblique electric field is generated between the lower transparent electrode 32 and the liquid crystal display device operating in the FFS mode.
- a vertical or horizontal alignment film may be provided on the pixel electrode 30 depending on the display mode.
- the TFT substrate 100 including the oxide semiconductor TFT has been described as the semiconductor device of Embodiment 1. However, if this TFT substrate 100 is used, a display device having excellent display quality can be manufactured with a high yield.
- (Embodiment 2) 7 and 8A and 8B show the TFT substrate 200 of the second embodiment.
- the TFT substrate 200 of this embodiment is different from the TFT substrate 100 of Embodiment 1 in that the etching stopper layer 24 is not formed on the oxide semiconductor layer 18. That is, the TFT substrate 200 of this embodiment includes a channel etch type TFT 6.
- the same referential mark is attached
- the passivation layer 23 provided so as to cover the TFT 6 is in contact with the source and drain electrodes 14 and 16 and the channel of the oxide semiconductor layer 18. It is provided in contact with the region.
- the passivation layer 23 includes a lower insulating layer 23a and an upper insulating layer 23b provided on the lower insulating layer 23a, like the passivation layer 22 of the first embodiment.
- the lower insulating layer 23a is formed of a silicon nitride (SiNx) layer having a thickness of more than 0 nm and not more than 30 nm
- the upper insulating layer 23b is formed of a silicon oxide layer (SiOx) having a thickness of more than 30 nm.
- the lower insulating layer 23a is formed of a silicon nitride layer, it typically contains hydrogen. However, the thickness of the lower insulating layer 23a is 30 nm or less as described above, and is much thinner than the thickness of the passivation layer 23 that is generally formed (for example, 100 to 400 nm). For this reason, the amount of hydrogen contained in the lower insulating layer 23a is sufficiently small as compared with the case where the passivation layer 23 is formed of a single SiNx layer as in the prior art.
- the upper insulating layer 23b formed on the lower insulating layer 23a is formed of a SiOx layer having a lower hydrogen content than the lower insulating layer 23a. Therefore, the hydrogen content of the passivation layer 23 is not large as a whole.
- the oxide semiconductor TFT6 having good element characteristics can be obtained.
- the TFT substrate 200 can be manufactured.
- FIGS. 9A to 9E and FIGS. 10F to 10J show the manufacturing process of the TFT substrate 200.
- the source and drain electrodes 14 and 16 are connected to the oxide semiconductor layer 18 without providing the etching stopper layer 21. They are formed apart from each other so as to be connected. Thus, since the process of providing the etching stopper layer 21 is not necessary, the manufacturing process can be further simplified as compared with the case of the first embodiment.
- the oxide semiconductor layer 18 may be over-etched to the channel region.
- the conductive film for forming the source and drain electrodes 14 and 16 is in direct contact with the channel region of the oxide semiconductor layer 18, the metal element contained in the metal film forming the bottom surface of the conductive film is oxidized. There is a risk of diffusion into the physical semiconductor layer 18.
- the configuration and materials of the source and drain electrodes 14 and 16 may be the same as those in the first embodiment.
- the surfaces of the source and drain electrodes 14 and 16 are typically formed from a material (for example, MoN) containing Mo, Ti, Cu, and Al.
- a passivation layer 23 is formed.
- the passivation layer 23 is formed so as to be in contact with the source electrode 14, the drain electrode 16, and the oxide semiconductor layer 18.
- the silicon nitride layer 23a is in contact with the upper layers 14c and 16c of the source / drain electrodes, it is possible to prevent a metal oxide film from being formed on the surface of the source / drain electrodes. Thereby, the fall of the adhesiveness of the passivation layer 23 is suppressed.
- the silicon nitride layer 23a is a thin layer, the influence of hydrogen on the back channel of the oxide semiconductor layer 18 is small.
- FIGS. 10 (f) to (j) are substantially the same as the steps shown in FIGS. 5 (h) and (g) and FIGS. 6 (j) to (l), respectively.
- the description is omitted here. Note that, since the etching stopper layer is not provided, the etching stopper layer does not need to be etched when forming the contact hole CH1 'in the peripheral region, which is different from the case of the first embodiment.
- TFT substrate 200 formed in this way is used, a display device excellent in display quality can be manufactured with a high yield.
- the present invention can also be applied to a TFT having a top gate structure.
- an insulating layer passivation layer
- a silicon nitride layer with a thickness of 30 nm or less in a region in contact with the metal wiring in the passivation layer, and providing a silicon oxide layer thereon, good device characteristics are realized while preventing film peeling. obtain.
- the upper surface of the semiconductor layer is in contact with the source electrode and the drain electrode.
- the source electrode and the drain electrode are formed first, and an island-shaped semiconductor layer is formed so as to straddle the source electrode and the drain electrode.
- the present invention may be applied to a bottom contact TFT.
- an active matrix substrate used for a liquid crystal display device has been described.
- an active matrix substrate for an organic EL display device can also be manufactured.
- a light emitting element provided for each pixel includes an organic EL layer, a switching TFT, and a driving TFT, and the semiconductor device according to the embodiment of the present invention can be used for this TFT.
- a memory element oxide semiconductor thin film memory
- the semiconductor device and the manufacturing method thereof according to the embodiment of the present invention are suitably used as a TFT substrate for a display device and a manufacturing method thereof.
- Gate wiring 4 Source wiring 5, 6 TFT (oxide semiconductor TFT) DESCRIPTION OF SYMBOLS 10 Substrate 12 Gate electrode 14 Source electrode 16 Drain electrode 18 Oxide semiconductor layer 20 Gate insulating layer 21 Etching stopper layer 22 Passivation layer 22a Lower insulating layer (silicon nitride layer) 22b Upper insulating layer (silicon oxide layer) 24 Interlayer insulation layer (planarization layer) 26 Dielectric layer 30 Upper transparent electrode (pixel electrode) 32 Lower transparent electrode (common electrode) 100, 200 TFT substrate 110 Peripheral area 120 Display area
Abstract
Description
図2および図3(a)、(b)は、実施形態1の半導体装置100を示す。ここでは、半導体装置100は、液晶表示装置に用いられるTFT基板(アクティブマトリクス基板)100である。図2は、TFT基板100の平面構造の一例を模式的に示し、図3(a)および(b)は、図2のA-A’線に沿った断面およびD-D’線に沿った断面をそれぞれ示す。
図7および図8(a)および(b)は、実施形態2のTFT基板200を示す。本実施形態のTFT基板200が、実施形態1のTFT基板100と異なる点は、酸化物半導体層18の上に、エッチングストッパ層24が形成されていない点である。すなわち、本実施形態のTFT基板200は、チャネルエッチ型のTFT6を備える。なお、実施形態1と同様の構成要素については同じ参照符号を付すとともに説明を省略する。
4 ソース配線
5、6 TFT(酸化物半導体TFT)
10 基板
12 ゲート電極
14 ソース電極
16 ドレイン電極
18 酸化物半導体層
20 ゲート絶縁層
21 エッチングストッパ層
22 パッシベーション層
22a 下層絶縁層(窒化シリコン層)
22b 上層絶縁層(酸化シリコン層)
24 層間絶縁層(平坦化層)
26 誘電体層
30 上層透明電極(画素電極)
32 下層透明電極(共通電極)
100、200 TFT基板
110 周辺領域
120 表示領域
Claims (11)
- 基板と、
前記基板の上に形成されたゲート電極と、
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た酸化物半導体層と、
前記酸化物半導体層に電気的に接続されたソース電極およびドレイン電極と、
前記ソース電極および前記ドレイン電極の上に形成された絶縁層と
を備える半導体装置であって、
前記絶縁層は、
前記ソース電極およびドレイン電極の上面の少なくとも一部と接し、0nm超30nm以下の厚さを有する窒化シリコン層と、
前記窒化シリコン層の上に形成された、30nmを超える厚さを有する酸化シリコン層とを含む、半導体装置。 - 前記酸化シリコン層の厚さは50nm以上400nm以下である請求項1に記載の半導体装置。
- 前記ソース電極およびドレイン電極の上面であって前記窒化シリコン層と接する面は、Mo、Ti、CuおよびAlからなる群から選択される少なくとも1種の元素を含む導電性材料から形成されている請求項1または2に記載の半導体装置。
- 前記ソース電極およびドレイン電極の前記接する面は、窒化モリブデンから形成されている請求項3に記載の半導体装置。
- 前記酸化物半導体層のチャネル領域上に形成されたエッチングストッパ層をさらに有する請求項1から4のいずれかに記載の半導体装置。
- 前記酸化物半導体層はIn-Ga-Zn-O系半導体から形成されている、請求項1から5のいずれかに記載の半導体装置。
- 基板を用意する工程(a)と、
前記基板上に、ゲート電極を形成する工程(b)と、
前記基板上に、前記ゲート電極と絶縁された状態で前記ゲート電極と対向する酸化物半導体層を形成する工程(c)と、
前記基板上に、前記酸化物半導体層と接続されるソース電極およびドレイン電極を形成する工程(d)と、
前記基板上に、前記ソース電極およびドレイン電極の上面の少なくとも一部と接する絶縁層を形成する工程(e)と、
前記工程(e)の後に、230℃以上480℃以下の温度で熱処理を行う工程(f)と、
を包含する半導体装置の製造方法であって、
前記工程(e)は、
前記ソース電極および前記ドレイン電極と接するように、窒素を含む第1絶縁領域を0nm超30nm以下の厚さで形成する工程と、
前記第1絶縁領域の上に、酸素を含む第2絶縁領域を30nm超の厚さで形成する工程と
を包含する、半導体装置の製造方法。 - 前記第1絶縁領域は、窒化シリコン層によって形成され、前記第2絶縁領域は、酸化シリコン層によって形成される、請求項7に記載の半導体装置の製造方法。
- 前記工程(d)は、前記ソース電極およびドレイン電極の表面を、Mo、Ti、Cu、Alからなる群から選択される少なくとも一種の元素を含む導電性材料から形成する工程を包む、請求項7または8に記載の半導体装置の製造方法。
- 前記工程(e)における窒素シリコン層を形成する工程は、SiH4ガスとNH3ガスとを含む原料ガスを用いるプラズマCVD法によって行われる請求項8に記載の半導体装置の製造方法。
- 前記酸化物半導体層は、In-Ga-Zn-O系半導体から形成されている、請求項7から10のいずれかに記載の半導体装置の製造方法。
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WO2011155125A1 (ja) * | 2010-06-08 | 2011-12-15 | シャープ株式会社 | 薄膜トランジスタ基板及びそれを備えた液晶表示装置並びに薄膜トランジスタ基板の製造方法 |
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JP2018110099A (ja) * | 2016-12-30 | 2018-07-12 | エルジー ディスプレイ カンパニー リミテッド | 有機発光表示装置及びその製造方法 |
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WO2019026704A1 (ja) * | 2017-08-01 | 2019-02-07 | シャープ株式会社 | 薄膜トランジスタ基板及びそれを備えた液晶表示装置並びに薄膜トランジスタ基板の製造方法 |
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JP7374918B2 (ja) | 2018-10-12 | 2023-11-07 | 株式会社半導体エネルギー研究所 | 半導体装置 |
US11935964B2 (en) | 2018-10-12 | 2024-03-19 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor device and method for manufacturing semiconductor device |
Also Published As
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CN104508808B (zh) | 2017-05-17 |
TW201411855A (zh) | 2014-03-16 |
CN104508808A (zh) | 2015-04-08 |
US20150187948A1 (en) | 2015-07-02 |
JPWO2014017406A1 (ja) | 2016-07-11 |
JP5855752B2 (ja) | 2016-02-09 |
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