WO2009096148A1 - 半導体装置及びその製造方法 - Google Patents
半導体装置及びその製造方法 Download PDFInfo
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- WO2009096148A1 WO2009096148A1 PCT/JP2009/000169 JP2009000169W WO2009096148A1 WO 2009096148 A1 WO2009096148 A1 WO 2009096148A1 JP 2009000169 W JP2009000169 W JP 2009000169W WO 2009096148 A1 WO2009096148 A1 WO 2009096148A1
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- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/78606—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device
- H01L29/78618—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device characterised by the drain or the source properties, e.g. the doping structure, the composition, the sectional shape or the contact structure
- H01L29/78621—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device characterised by the drain or the source properties, e.g. the doping structure, the composition, the sectional shape or the contact structure with LDD structure or an extension or an offset region or characterised by the doping profile
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- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/41—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions
- H01L29/423—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions not carrying the current to be rectified, amplified or switched
- H01L29/42312—Gate electrodes for field effect devices
- H01L29/42316—Gate electrodes for field effect devices for field-effect transistors
- H01L29/4232—Gate electrodes for field effect devices for field-effect transistors with insulated gate
- H01L29/42384—Gate electrodes for field effect devices for field-effect transistors with insulated gate for thin film field effect transistors, e.g. characterised by the thickness or the shape of the insulator or the dimensions, the shape or the lay-out of the conductor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/78606—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device
- H01L29/78618—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device characterised by the drain or the source properties, e.g. the doping structure, the composition, the sectional shape or the contact structure
- H01L29/78621—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device characterised by the drain or the source properties, e.g. the doping structure, the composition, the sectional shape or the contact structure with LDD structure or an extension or an offset region or characterised by the doping profile
- H01L29/78624—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device characterised by the drain or the source properties, e.g. the doping structure, the composition, the sectional shape or the contact structure with LDD structure or an extension or an offset region or characterised by the doping profile the source and the drain regions being asymmetrical
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
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- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/78606—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device
- H01L29/78618—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device characterised by the drain or the source properties, e.g. the doping structure, the composition, the sectional shape or the contact structure
- H01L29/78621—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device characterised by the drain or the source properties, e.g. the doping structure, the composition, the sectional shape or the contact structure with LDD structure or an extension or an offset region or characterised by the doping profile
- H01L29/78627—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device characterised by the drain or the source properties, e.g. the doping structure, the composition, the sectional shape or the contact structure with LDD structure or an extension or an offset region or characterised by the doping profile with a significant overlap between the lightly doped drain and the gate electrode, e.g. GOLDD
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
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- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
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- H01L29/78645—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with multiple gate
Definitions
- the present invention relates to a semiconductor device and a manufacturing method thereof.
- liquid crystal display devices have been widely used because of their advantages such as light weight, thinness, and low power consumption.
- the number of pixels can be increased and a display contrast ratio can be improved as compared with a passive matrix liquid crystal display device. .
- the active matrix liquid crystal display device includes a switching element such as a thin film transistor (hereinafter, “TFT”) for each pixel.
- TFT thin film transistor
- a substrate on which switching elements are formed is referred to as an “active matrix substrate”.
- a typical active matrix liquid crystal display device includes an active matrix substrate, a counter substrate, and a liquid crystal layer provided therebetween.
- the active matrix substrate is provided with a pixel electrode for each pixel as a unit of image display, and each pixel electrode is connected to a switching element arranged corresponding to each pixel electrode.
- display is performed by changing the voltage applied to the liquid crystal layer by the pixel electrode and the counter electrode formed on the counter substrate.
- Various functional circuits such as a drive circuit can also be formed on the active matrix substrate, and TFTs are also used for such functional circuits.
- a TFT provided for each pixel is referred to as a “pixel TFT”
- a TFT used in a functional circuit such as a drive circuit is referred to as a “drive circuit TFT”.
- the pixel TFT is required to have an extremely small off-leakage current.
- it is necessary to maintain the voltage applied to the liquid crystal for a period of one frame until the screen is rewritten.
- the off current (off leak current) of the pixel TFT is large, the voltage applied to the liquid crystal This is because the display characteristics may deteriorate with time.
- the structure of the pixel TFT for example, a structure in which a low concentration impurity region (Lightly Doped Drain, hereinafter abbreviated as “LDD region”) is formed in at least one of the channel region of the TFT and the source region / drain region.
- LDD region Lightly Doped Drain
- Such a structure is referred to as an “LDD structure”. Since the LDD region can alleviate electric field concentration near the drain, off-leakage current can be greatly reduced as compared with a TFT having no LDD region (“single drain structure”). On the other hand, since the LDD region becomes a resistance, the current driving capability is lower than that of a single drain structure TFT.
- the driving circuit TFT since the driving circuit TFT needs to operate at high speed, the driving circuit TFT is required to have a large current driving force, that is, a large on-current.
- the driving circuit TFT has a different structure from the pixel TFT described above.
- a structure of a driving circuit TFT for example, a structure in which LDD regions are overlapped by a gate electrode is known. Such a structure is referred to as a “GOLD (Gate Overlapped LDD) structure”.
- GOLD Gate Overlapped LDD
- a TFT having a GOLD structure when a voltage is applied to the gate electrode, electrons serving as carriers are accumulated in the LDD region where the gate electrode overlaps. Therefore, since the resistance of the LDD region can be reduced, it is possible to suppress a decrease in the current driving capability of the TFT.
- a TFT with a GOLD structure has a disadvantage that off-leakage current is larger than a TFT with an LDD structure (a structure in which a gate electrode and an LDD region do not overlap), and is not suitable for a pixel TFT. This is considered to be because a storage layer is formed in the LDD region where the gate electrodes overlap even when the TFT is in the OFF state.
- the GOLD structure since the gate electrode and the LDD region overlap, the parasitic capacitance (Cgs, Cgd) between the gate electrode and the source and drain electrodes becomes relatively large. Therefore, it is necessary to increase the gate capacitance. However, if the gate capacitance increases, the load capacitance during operation in the circuit including this TFT increases, which may adversely affect the circuit operation. This adverse effect is particularly noticeable when the TFT channel length is short.
- Patent Document 1 and Patent Document 2 propose a structure in which only a part of the LDD region is overlapped by the gate electrode for the purpose of improving TFT characteristics.
- an LDD region that is entirely overlapped by a gate electrode (that is, overlaps with the gate electrode) and a partial gate are formed between the source region, the drain region, and the channel region.
- a TFT structure with an LDD region overlapped by an electrode is disclosed.
- a TFT structure in which the gate electrode has a two-layer structure of a main gate electrode and a sub-gate electrode has also been proposed.
- a sub-gate electrode having the same potential as the main gate electrode is provided on the main gate electrode via an insulating film, and only the sub-gate electrode overlaps (overlaps) the LDD region.
- Arranged TFT structures are disclosed. According to this structure, since the sub-gate electrode overlaps with the LDD region, an effect similar to the GOLD structure, that is, a high current driving force can be obtained.
- the sub-gate electrode is provided on the main gate electrode via an insulating film, the thickness of the insulating film on the LDD region is larger than the thickness of the gate insulating film on the channel portion. Therefore, an effect similar to that of the LDD structure that can reduce off-leakage current can be obtained.
- the TFT having the structure as described above has the following problems.
- the sub-gate electrode is formed of a third electrode layer different from the main gate electrode and the source and drain electrodes. Therefore, the manufacturing process of the TFT having the structure disclosed in these patent documents is more complicated than the manufacturing process of the TFT having the structure without the sub-gate electrode.
- the manufacturing process becomes complicated, so that the productivity is lowered as compared with the conventional LDD structure and GOLD structure TFT.
- the present invention has been made in view of the above circumstances, and a main object thereof is to provide a thin film transistor which is excellent in productivity and has a low off-state current while ensuring a high current driving force. .
- the semiconductor device of the present invention includes a semiconductor layer having a channel region, a source region and a drain region located on both sides of the channel region, a gate insulating layer formed on the semiconductor layer, and the gate insulating layer A thin film transistor having a gate electrode, a source electrode electrically connected to the source region, and a drain electrode electrically connected to the drain region, wherein the gate electrode is a single electrode
- a second low-concentration impurity region having a high impurity concentration, and one of the first and second low-concentration impurity regions entirely overlaps the gate electrode, and the first and second low-concentration impurity regions The other region of the concentration impurity region does not overlap with the gate electrode.
- the gate electrode has a bilaterally symmetric shape in a cross section parallel to the channel direction of the thin film transistor and along the thickness direction of the gate electrode.
- an end of the one region of the first and second low-concentration impurity regions opposite to the channel region is aligned with one end of the gate electrode, and In addition, an end portion on the channel region side of the other region of the second low-concentration impurity region is aligned with the other end portion of the gate electrode.
- Another semiconductor device of the present invention is located outside the first channel region, the first high concentration impurity region located outside the first channel region, and the second channel region.
- a thin film transistor having a first electrode and a second electrode electrically connected to the second high-concentration impurity region, wherein the semiconductor layer includes the first channel region and the first high-concentration region.
- the first channel region is provided between the first channel region and the third high-concentration impurity region, and has an impurity concentration lower than that of the first, second, and third high-concentration impurity regions.
- a low concentration impurity region provided between the second channel region and the second high concentration impurity region, and between the second channel region and the third high concentration impurity region, respectively;
- a second low-concentration impurity region having an impurity concentration lower than that of the first, second, and third high-concentration impurity regions, and the entire first low-concentration impurity region is entirely
- the second gate electrode overlaps with the first gate electrode, and the second low-concentration impurity region does not overlap with the second gate electrode.
- the first and second gate electrodes are formed of a single conductive film.
- the first and second gate electrodes have a symmetrical shape in a cross section parallel to the channel direction of the thin film transistor and along the thickness direction of the gate electrode.
- the manufacturing method of the present invention is a manufacturing method of a semiconductor device provided with a thin film transistor, wherein (a) an island-shaped semiconductor layer is formed on a substrate, and (b) a gate insulating film is formed to cover the semiconductor layer. And (c) implanting a first impurity ion into a part of the semiconductor layer at a first dose, whereby one end of a portion of the semiconductor layer that becomes a channel region. Forming a first impurity ion implantation region so as to be adjacent to the portion; and (d) at least a portion of the semiconductor layer to be a channel region and at least one of the first impurity ion implantation regions on the gate insulating film.
- a third impurity ion is implanted into the semiconductor layer at a dose of 1 to form source and drain regions, whereby the first impurity ion implantation region is covered with the gate electrode.
- the region where the third impurity ions are not implanted becomes the first low-concentration impurity region, which is covered with the mask in the second impurity ion-implanted region, Comprising a step of region objects ions were not implanted becomes the second low-concentration impurity regions.
- the off-leakage current can be kept low while securing the current driving capability of the thin film transistor. Further, such a thin film transistor can be manufactured by a simple method without increasing the number of manufacturing steps and the manufacturing cost.
- the thin film transistor When the thin film transistor is applied to a driving circuit of a display device, it is advantageous in that the off characteristic can be improved as compared with the conventional GOLD structure TFT while securing the on characteristic sufficient for driving the circuit.
- the thin film transistor when used as a sampling switch, it is advantageous because parasitic capacitances (Cgs, Cgd) can be reduced and current consumption can be reduced without reducing the on-current.
- the thin film transistor has excellent on characteristics and off characteristics, it can be suitably used as a pixel TFT and a drive circuit TFT in an active matrix display device. As a result, the manufacturing process of the active matrix substrate can be greatly simplified while ensuring display characteristics substantially the same as those of the prior art.
- FIG. 1st Embodiment It is typical sectional drawing of the thin-film transistor in 1st Embodiment by this invention.
- (A) is typical sectional drawing which shows arrangement
- (b) is a graph which illustrates the voltage-current characteristic of the thin-film transistor of (a). is there.
- (A) is typical sectional drawing which shows arrangement
- (b) is a graph which illustrates the voltage-current characteristic of the thin film transistor of (a). is there.
- (A) is typical sectional drawing which shows arrangement
- (b) is the voltage-current characteristic of the thin-film transistor of (a). It is a graph to illustrate.
- (A)-(g) is process sectional drawing for demonstrating the manufacturing method of the thin-film transistor in 1st Embodiment by this invention. It is typical sectional drawing of the thin-film transistor in 2nd Embodiment by this invention.
- (A)-(e) is process sectional drawing for demonstrating the manufacturing method of the thin-film transistor in 2nd Embodiment by this invention. It is typical sectional drawing of the thin-film transistor in 3rd Embodiment by this invention. It is a figure for demonstrating the structure of an analog full monolithic sampling switch.
- Source electrode or drain electrode 100, 200, 300 Thin film transistor 10 Semiconductor layer 11 Substrate 12, 12A, 12B Channel region 13 Gate insulating film 14, 14A, 14B Gate electrode 15 Source region or drain region 16a, 16b, 16Aa, 16Ab, 16Ba, 16Bb LDD region 15A, 15B, 15C High concentration impurity region 17 Interlayer insulating film 18 Contact hole 19 Source electrode or drain electrode
- the “semiconductor device” widely includes a semiconductor element such as a thin film transistor, a substrate on which a functional circuit is formed, an active matrix substrate, and a display device such as a liquid crystal display device or an organic EL display device.
- the semiconductor device of this embodiment includes a thin film transistor as described below.
- FIG. 1 is a schematic cross-sectional view of a thin film transistor according to this embodiment.
- the thin film transistor 100 includes a semiconductor layer 10 supported by a substrate 11 having an insulating surface, a gate electrode 14 provided on the semiconductor layer 10 with a gate insulating film 13 interposed therebetween, and an interlayer insulating film covering the gate electrode 14 17 and source / drain electrodes 19.
- the semiconductor layer 10 includes a channel region 12, source / drain regions (high concentration impurity regions) 15, and LDD regions (low concentration impurity regions) 16 a and 16 b having an impurity concentration lower than the impurity concentration of the source / drain regions 15. have.
- the LDD regions 16a and 16b are formed between the channel region 12 and the source / drain regions 15, respectively.
- the gate electrode 14 is formed of a single conductive film.
- “formed from a single conductive film” means a structure formed by patterning one conductive film (may be a laminated film) and has different patterns. It does not include a gate structure composed of two or more conductive films, for example, a structure composed of a main gate electrode and a sub-gate electrode described in Patent Document 3 and Patent Document 4 described above. Further, a structure in which a main gate electrode and a sub-gate electrode having different patterns are stacked without an insulating film (for example, Patent Document 5) is not included.
- the gate electrode 14 overlaps the entire LDD region 16a (GOLD structure) and does not overlap the LDD region 16b (LDD structure).
- the gate electrode overlaps the entire LDD region excludes the case where the gate electrode partially overlaps the LDD region.
- the gate electrode does not overlap the LDD region means that the gate electrode does not overlap the LDD region at all, and excludes the case where the gate electrode partially overlaps the LDD region. Therefore, the “GOLD structure” here refers to a structure in which the gate electrode 14 overlaps the entire LDD region (here, the LDD region 16a).
- the “LDD structure” refers to a structure in which the gate electrode 14 does not overlap the LDD region (here, the LDD region 16b).
- the “LDD region” in the present embodiment refers to a region having an impurity concentration of 1 ⁇ 10 17 atoms / cm 3 or more and lower than the impurity concentration of the source / drain region 15. Therefore, the semiconductor layer 10 does not include a region containing impurities at an extremely low concentration (less than 1 ⁇ 10 17 atoms / cm 3 ). For example, a part of the impurity implanted into the LDD region 16b may diffuse to the channel region 12 below the gate electrode 14, but the impurity concentration in the portion where the impurity is diffused is considered to be extremely low. The portion is not included in the “LDD region 16b”.
- the gate electrode 14 in the present embodiment only needs to cover one of the LDD regions 16a and 16b, may cover the LDD region located on the source side of the channel region 12, or may be on the drain side.
- the located LDD region may be covered.
- it is preferable to cover only the LDD region located on the drain side because the reliability of the thin film transistor can be further improved. This is because electric field relaxation is required on the drain side than on the source side, and the GOLD structure is more resistant to deterioration by hot carriers than the LDD structure.
- the interlayer insulating film 17 may have a single layer structure or a multilayer structure of two or more layers.
- Contact holes 18 reaching the source / drain regions 15 of the semiconductor layer 10 are formed in the interlayer insulating film 17.
- a source / drain electrode 19 is formed from a conductive layer formed on the interlayer insulating film 17 and inside the contact hole 18. Accordingly, the source / drain electrodes 19 are electrically connected to the source / drain regions 15 of the semiconductor layer 10, respectively.
- one of the LDD regions 16a and 16b provided on the source side and the drain side of the channel region 12 has an LDD structure, and the other region has a GOLD structure. That is, a single thin film transistor 100 has an LDD structure and a GOLD structure. The effect of such a structure will be described with reference to the drawings.
- FIGS. 2 to 4 are diagrams showing the structure and voltage-current characteristics of a conventional LDD structure TFT, a conventional GOLD structure TFT, and the thin film transistor 100 of the present embodiment, respectively.
- a schematic cross-sectional view showing the arrangement of the semiconductor layer and the gate electrode of the thin film transistor, (b) of each figure is a graph illustrating the voltage-current characteristics of the thin film transistor. For simplicity, the same components as those in FIG.
- the LDD regions 26a and 26b located on both sides of the channel region 22 do not overlap with the gate electrode 24 (LDD structure).
- the electric field in the vicinity of the source / drain region 25 can be relaxed by the LDD structure, so that the off current (off leak current) can be reduced.
- the on-resistance is increased by the LDD regions 26a and 26b, the on-current is also decreased.
- the LDD regions 36a and 36b located on both sides of the channel region 32 all overlap the gate electrode 34 (GOLD structure). ). Therefore, in the GOLD structure, since the accumulation layer is also formed in the LDD regions 36a and 36b in the on state, the on-resistance can be reduced and the on-current can be increased as compared with the LDD structure TFT shown in FIG. . However, even in the off state, since a storage layer is formed in the LDD regions 36a and 36b, the leakage current becomes larger than that of the TFT having the LDD structure.
- the thin film transistor 100 can reduce the leakage current in the off state, so that higher off characteristics can be obtained than the GOLD structure TFT shown in FIG. Further, since it has a GOLD structure, the ON-state resistance (ON resistance) can be made smaller than that of the TFT having the LDD structure shown in FIG. 2, and as a result, a reduction in ON current can be suppressed and high ON characteristics can be secured.
- ON resistance ON resistance
- the gate electrode 14 since the gate electrode 14 has a single layer structure, the effects of the LDD structure and the GOLD structure can be achieved without complicating the manufacturing process. Therefore, this is more advantageous than the TFT structures disclosed in Patent Document 3 and Patent Document 4 described above.
- the gate electrode 14 has a symmetrical shape in the cross section shown in FIG. 1, that is, in the cross section parallel to the channel direction of the thin film transistor 100 and along the thickness direction of the gate electrode 14. Preferably it is. This is because if the gate electrode 14 has a left-right asymmetric cross-sectional shape, the manner in which the electric field is applied becomes unstable and causes a variation in TFT characteristics.
- the LDD regions 16a and 16b are preferably formed using a process as described later.
- the end of the LDD region (LDD structure) 16 b opposite to the channel region 12 can be aligned with one end of the gate electrode 14.
- the end of the LDD region (GOLD structure) 16 a on the channel region side can be aligned with the other end of the gate electrode 14. Accordingly, the manufacturing process can be simplified and the thin film transistor 100 having high characteristics can be more reliably manufactured.
- a semiconductor layer 10 is formed on a substrate 11.
- the substrate 11 may be an Si substrate or metal substrate whose surface is covered with an insulating layer other than a quartz substrate and a glass substrate, as long as the surface on which the thin film transistor 100 is formed is an insulating surface.
- the semiconductor layer 10 is formed from a crystalline silicon film having a thickness of 30 nm to 100 nm, for example.
- an amorphous silicon film is deposited on the substrate 11 by a known method such as a CVD (Chemical Vapor Deposition) method. Thereafter, the amorphous silicon film is crystallized to obtain a crystalline silicon film. Crystallization of the amorphous silicon film can be performed by a known method.
- the amorphous silicon film may be crystallized by irradiating the amorphous silicon film with laser light.
- the laser beam a pulse oscillation type or continuous oscillation type excimer laser beam is desirable, but a continuous oscillation type argon laser beam may be used.
- the amorphous silicon film may be crystallized by heat treatment (for example, laser irradiation).
- the obtained crystalline silicon film is patterned by photolithography and etching to obtain the island-shaped semiconductor layer 10.
- a plurality of island-shaped semiconductor layers are formed from the crystalline silicon film, but only one of the semiconductor layers 10 is shown here.
- a gate insulating film 13 made of, for example, a 100 nm SiO 2 film is formed on the semiconductor layer 10.
- the gate insulating film 13 can be formed using a CVD method.
- a resist film 41 having an opening is formed on the gate insulating film 13 on the portion of the semiconductor layer 10 that becomes the LDD region 16a (FIG. 1).
- Impurity ion implantation regions 45 are obtained by implanting N-type impurity ions 43 into the openings at a low concentration.
- the opening only needs to be disposed on a region including a portion that becomes the LDD region 16a (FIG. 1), and as shown in the drawing, the opening becomes the entire portion that becomes the LDD region 16a (FIG. 1) and the source / drain regions. You may arrange
- the resist layer 41 is used to mask the impurity layer 43 so that the channel layer and the LDD region 16b (FIG.
- the semiconductor layer 10 are not implanted.
- phosphorus ions are implanted as the impurity ions 43, the acceleration voltage at the time of implantation is, for example, 80 kV, and the dose amount is, for example, 1 ⁇ 10 13 / cm 2 .
- the gate electrode 14 is disposed so as to cover a portion that becomes the LDD region 16 a (FIG. 1) in the impurity ion implantation region 45 and a portion that becomes the channel region in the semiconductor layer 10.
- the gate electrode 14 is formed by, for example, forming a tungsten (W) film (thickness: 400 nm, for example) by sputtering, then forming a photoresist on the W film, and etching the W film using the photoresist as a mask. Can be done by.
- the gate electrode 14 may be formed by patterning a laminated film made of, for example, a TaN film and a W film.
- impurity ions 46 are implanted into the semiconductor layer 10 at a low concentration using the gate electrode 14 as a mask.
- the region 16a covered with the gate electrode 14 in the impurity ion implanted region 45 and not implanted with the impurity ions 46 becomes an LDD region (LDD length: for example, 1.0 ⁇ m).
- the region 12 of the semiconductor layer 10 that is covered with the gate electrode 14 and in which the impurity ions 43 are not implanted becomes a “channel region (channel length: for example, 4.0 ⁇ m)”.
- an impurity ion implantation region 47 including impurity ions 46 is formed in a portion of the semiconductor layer 10 located on the opposite side of the channel region 12 from the LDD region 16a.
- phosphorus ions are implanted as the impurity ions 46, the acceleration voltage at the time of implantation is, for example, 80 kV, and the dose amount is, for example, 6 ⁇ 10 12 / cm 2 .
- a resist film 49 is formed covering the gate electrode 14 and the semiconductor layer 10 so as to cover the LDD region 16b (FIG. 1), and the resist film 49 and the gate electrode 14 are formed.
- impurity ions 51 are implanted into the semiconductor layer 10 at a high concentration.
- the region 16b of the impurity ion implantation region 47 that is covered with the resist film 49 and into which the impurity ions 51 are not implanted becomes an LDD region (LDD length: for example, 1.0 ⁇ m).
- impurity ions 51 are implanted at a high concentration, and source / drain regions (also referred to as high concentration impurity regions) 15 are formed.
- phosphorus ions are implanted as the impurity ions 51, the acceleration voltage at the time of implantation is, for example, 50 kV, and the dose amount is, for example, 3 ⁇ 10 15 / cm 2 .
- impurity ions in the LDD regions 16a and 16b and the source / drain regions 15 are activated by heat treatment.
- a heat treatment method a furnace annealing method, a lamp annealing method, a laser annealing method, or the like can be used.
- an interlayer insulating film 17 is formed so as to cover the gate electrode 14 and the semiconductor layer 10, and then a source / drain electrode 19 is formed.
- the interlayer insulating film 17 may have a laminated structure including a SiN film and a SiO 2 film.
- a conductive film is formed on the interlayer insulating film 17 (including the inside of the contact hole 18) by, for example, sputtering. From this conductive film, a source / drain electrode 19 having a desired shape is formed by photolithography, etching, or the like. In this way, the thin film transistor 100 is obtained.
- the semiconductor device of this embodiment may include a plurality of thin film transistors, and at least one of the plurality of thin film transistors may have a structure as shown in FIG.
- the thin film transistor 100 described above and another thin film transistor having a structure different from that of the thin film transistor 100 may be formed over the same support.
- the other thin film transistor may be, for example, an LDD structure TFT shown in FIG. 2 or a GOLD structure TFT shown in FIG.
- Such a TFT can also be manufactured by the same method as described above if the pattern of the resist film 41 and the resist film 49 is changed. Therefore, it is possible to simultaneously manufacture such a TFT and the thin film transistor 100 on the same substrate. Become.
- the semiconductor device of this embodiment has a structure in which two or more TFTs including a TFT having an LDD structure and a TFT having a GOLD structure are vertically stacked.
- “Vertical stacking” refers to a configuration in which the source region of a TFT is connected to the drain region of another TFT.
- a structure in which a single LDD structure TFT and a single GOLD structure TFT are vertically stacked (dual-gate thin film transistor) will be described as an example.
- FIG. 6 is a cross-sectional view schematically showing the thin film transistor in the present embodiment.
- the thin film transistor 200 includes a semiconductor layer 10 supported by a substrate 11 having an insulating surface, and a plurality of gate electrodes (here, two gate electrodes) 14A provided on the semiconductor layer 10 with a gate insulating film 13 interposed therebetween. , 14B and source / drain electrodes 19.
- the gate electrodes 14 ⁇ / b> A and 14 ⁇ / b> B are disposed between the source / drain electrodes 19.
- the semiconductor layer 10 includes two channel regions 12A and 12B, LDD regions 16Aa and 16Ab located on both sides of the channel region 12A, LDD regions 16Ba and 16Bb located on both sides of the channel region 12B, and high-concentration impurity regions 15A to 15A. 15C.
- the high concentration impurity regions 15A and 15C are located at both ends of the semiconductor layer 10 and are electrically connected to the source / drain electrodes 19, respectively.
- the high concentration impurity region 15B is formed between the LDD region 16Ab and the LDD region 16Ba.
- the gate electrode 14A is disposed so as to overlap the channel region 12A and the LDD regions 16Aa and 16Ab located on both sides thereof (GOLD structure).
- the gate electrode 14B covers only the channel region 12B and is disposed so as not to overlap the LDD regions 16B located on both sides of the channel region 12B (LDD structure).
- TFTs having a structure selected according to the application are connected to each other. That is, there is no idea that TFTs having LDD structures are connected to each other or TFTs having a GOLD structure are connected to each other and TFTs having different structures suitable for different applications are connected to each other.
- TFTs having LDD structures are connected to each other or TFTs having a GOLD structure are connected to each other and TFTs having different structures suitable for different applications are connected to each other.
- the LDD structure TFT and the GOLD structure TFT are connected, higher on-characteristics than the vertical stacking of the LDD structure TFT can be realized, and the vertical structure of the GOLD structure TFT can be realized. Off-leakage current can be reduced compared to stacking.
- each of the gate electrodes 14A and 14B has a single-layer structure, as in the first embodiment. Further, it is advantageous that each of the gate electrodes 14A and 14B has a symmetrical cross-sectional shape.
- the semiconductor layer 10 and the gate insulating film 13 are formed on the substrate 11 by a method similar to the method described with reference to FIGS.
- a resist film 61 is formed on the gate insulating film 13 so as to open on the semiconductor layer 10 including regions that become the LDD regions 16 ⁇ / b> Aa and 16 ⁇ / b> Ab (FIG. 6). To do. However, the resist film 61 is patterned so as to cover at least the portions of the semiconductor layer 10 that will become the channel region 12A, the channel region 12B, and the LDD regions 16Ba and 16Bb (FIG. 6).
- impurity ions 63 are implanted into the semiconductor layer 10 to obtain an impurity ion implanted region 65.
- phosphorus ions are implanted as the impurity ions 63, the acceleration voltage at the time of implantation is, for example, 80 kV, and the dose amount is, for example, 1 ⁇ 10 13 / cm 2 .
- gate electrodes 14A and 14B are formed on the semiconductor layer 10 as shown in FIG.
- the gate electrode 14A is disposed so as to cover portions of the impurity ion implantation region 65 that become the LDD regions 16Aa and 16Ab (FIG. 6) and a portion of the semiconductor layer 10 that becomes the channel region 12A (FIG. 6).
- the gate electrode 14B is disposed so as to cover a portion of the semiconductor layer 10 that becomes the channel region 12B (FIG. 6).
- the method for forming the gate electrode 14 may be the same as the method described above with reference to FIG.
- impurity ions 66 are implanted into the semiconductor layer 10 at a low concentration using the gate electrodes 14A and 14B as a mask.
- the regions 16Aa and 16Ab that are covered with the gate electrode 14A in the impurity ion implantation region 65 and into which the impurity ions 66 are not implanted become LDD regions (LDD length: for example, 1.0 ⁇ m), respectively.
- a region 12A located under the gate electrode 14A and into which the impurity ions 63 and 66 are implanted is a channel region (channel length: 4.0 ⁇ m, for example), located under the gate electrode 14B.
- the region 12B that has not been implanted becomes a channel region (channel length: for example, 4.0 ⁇ m). Further, all portions of the semiconductor layer 10 that do not overlap with the gate electrodes 12 ⁇ / b> A and 12 ⁇ / b> B become impurity ion implantation regions 67.
- phosphorus ions are implanted as the impurity ions 66, the acceleration voltage at the time of implantation is, for example, 80 kV, and the dose amount is, for example, 6 ⁇ 10 12 / cm 2 .
- a resist film 69 covering the gate electrode 14B is formed, and impurity ions 71 are implanted into the semiconductor layer 10 at a high concentration using the resist film 69 and the gate electrode 14A as a mask.
- the regions 16Ba and 16Bb which are covered with the resist film 69 in the impurity ion implantation region 67 and into which the impurity ions 71 are not implanted become LDD regions (LDD length: for example, 1.0 ⁇ m).
- the regions 15A to 15C into which the impurity ions 71 are implanted at a high concentration in the semiconductor layer 10 become high concentration impurity regions.
- the high concentration impurity region formed outside the channel region 12A is “15A”
- the high concentration impurity region formed outside the channel region 12B is “15C”
- the high concentration impurity region is defined as “15B”.
- phosphorus ions are implanted as the impurity ions 71, the acceleration voltage at the time of implantation is, for example, 50 kV, and the dose amount is, for example, 3 ⁇ 10 15 / cm 2 .
- the interlayer insulating film 17 is formed so as to cover the gate electrodes 14A and 14B and the semiconductor layer 10, and subsequently, the high concentration impurity region 15A. 15C, source / drain electrodes 19 electrically connected to 15C are formed. In this way, a thin film transistor 200 having a dual gate structure is obtained.
- the thin film transistor of this embodiment has a vertically stacked structure of two TFTs having the configuration described above with reference to FIG.
- FIG. 8 is a cross-sectional view schematically showing the thin film transistor in the present embodiment.
- the same components as those of the thin film transistor 200 illustrated in FIG. 6 are denoted by the same reference numerals, and description thereof is omitted.
- the gate electrode 14A provided above the channel region 12A overlaps one of the entire LDD regions 16Aa and 16Ab located on both sides of the channel region 12A (GOLD structure), and the LDD region 16Aa, It does not overlap with the other region of 16Ab (LDD structure).
- the gate electrode 14B provided above the channel region 12B overlaps one of the LDD regions 16Ba and 16Bb located on both sides of the channel region 12B, and the other region of the LDD regions 16Ba and 16Bb. And do not overlap.
- the ON characteristics can be secured by the GOLD structure, and the off-leakage current can be reduced by the LDD structure, so that a thin film transistor having excellent TFT characteristics can be realized.
- the thin film transistor 300 of this embodiment can be manufactured by the same method as that of the first embodiment, there is no need to increase the number of manufacturing steps and the manufacturing cost, and it is advantageous.
- the thin film transistors in the first to third embodiments described above are preferably used in a drive circuit such as a display device. This is advantageous because the off characteristics can be improved as compared with the TFT having the GOLD structure while securing the on characteristics sufficient for driving the circuit.
- FIG. 9 is a diagram for explaining the configuration of an analog full monolithic sampling switch.
- all the source line switches have a plurality of thin film transistors S1 to Sn electrically connected to the source lines 1 to n, respectively.
- the entire stage of the sampling switch that is, the capacitance between the gate / source of the thin film transistors S1 to Sn becomes a load. Therefore, if a GOLD structure TFT is used as in the prior art, the load capacity during operation increases, which may adversely affect circuit operation.
- the thin film transistor of the above-described embodiment when used as the thin film transistors S1 to Sn and the LDD region on the source side has an LDD structure, the capacitance between the gates / sources of the thin film transistors S1 to Sn is reduced. As a result, the load capacity can be greatly reduced. Therefore, the operating margin can be increased and the current consumption can be reduced.
- the thin film transistor of the above embodiment has excellent on characteristics and off characteristics, and is therefore suitable as a pixel TFT and a drive circuit TFT in an active matrix display device. Can be used. As a result, the manufacturing process of the active matrix substrate can be greatly simplified while ensuring display characteristics substantially the same as those of the prior art.
- the configuration and manufacturing method of the semiconductor device of the present invention are not limited to the configurations and methods described in the first to third embodiments.
- the formation method, material, thickness, impurity type, impurity concentration of each LDD region, and the like of each layer included in the thin film transistor can be selected as appropriate.
- the channel length of the thin film transistor and the size of the LDD region (length in the channel direction) can be selected as appropriate.
- the vertically stacked structure of two TFTs has been described, but a vertically stacked structure of three or more TFTs may be used.
- the thin film transistor in the present invention has a current driving power superior to that of a thin film transistor having a conventional LDD structure. Further, the off-leakage current can be suppressed and the load capacity during operation can be reduced as compared with the conventional thin film transistor having the GOLD structure. In addition, according to the method of the present invention, a semiconductor device including the above-described thin film transistor can be easily manufactured without increasing the number of steps.
- the present invention can be suitably applied to various semiconductor devices including thin film transistors, for example, display devices such as an active matrix substrate, a liquid crystal display device, and an organic EL display device.
- display devices such as an active matrix substrate, a liquid crystal display device, and an organic EL display device.
Abstract
Description
10 半導体層
11 基板
12、12A、12B チャネル領域
13 ゲート絶縁膜
14、14A、14B ゲート電極
15 ソース領域またはドレイン領域
16a、16b、16Aa、16Ab、16Ba、16Bb LDD領域
15A、15B、15C 高濃度不純物領域
17 層間絶縁膜
18 コンタクトホール
19 ソース電極またはドレイン電極
以下、図面を参照しながら、本発明による第1の実施形態の半導体装置を説明する。本実施形態の半導体装置は、以下に説明するような薄膜トランジスタを備えている。
以下、図面を参照しながら、本発明による半導体装置の第2の実施形態を説明する。本実施形態の半導体装置は、LDD構造のTFTおよびGOLD構造のTFTを含む2以上のTFTが縦積みされた構造を有している。「縦積み」とは、TFTのソース領域が他のTFTのドレイン領域と接続された構成をいう。ここでは、単一のLDD構造のTFTと単一のGOLD構造のTFTとが縦積みされた構造(デュアルゲート構造の薄膜トランジスタ)を例に説明する。
以下、図面を参照しながら、本発明による半導体装置の第3の実施形態を説明する。本実施形態の薄膜トランジスタは、図1を参照しながら前述した構成を有する2つのTFTの縦積み構造を有している。
Claims (7)
- チャネル領域と、前記チャネル領域の両側にそれぞれ位置するソース領域およびドレイン領域とを有する半導体層と、
前記半導体層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設けられたゲート電極と、
前記ソース領域と電気的に接続されたソース電極と、
前記ドレイン領域と電気的に接続されたドレイン電極と、
を有する薄膜トランジスタを備え、
前記ゲート電極は単一の導電膜から形成され、
前記半導体層は、
前記チャネル領域と前記ソース領域との間に設けられ、前記ソース領域および前記ドレイン領域の不純物濃度よりも低い不純物濃度を有する第1低濃度不純物領域と、
前記チャネル領域と前記ドレイン領域との間に設けられ、前記ソース領域および前記ドレイン領域の不純物濃度よりも低い不純物濃度を有する第2低濃度不純物領域と
を有し、
前記第1および第2低濃度不純物領域の一方の領域は、その全体が前記ゲート電極と重なっており、前記第1および第2低濃度不純物領域の他方の領域は、前記ゲート電極と重なっていない半導体装置。 - 前記薄膜トランジスタのチャネル方向と平行であり、かつ、ゲート電極の厚さ方向に沿った断面において、前記ゲート電極は左右対称な形状を有している請求項1に記載の半導体装置。
- 前記第1および第2低濃度不純物領域の前記一方の領域の前記チャネル領域と反対側の端部は、前記ゲート電極の一方の端部と整合しており、
前記第1および第2低濃度不純物領域の前記他方の領域のチャネル領域側の端部は、前記ゲート電極の他方の端部と整合している請求項1または2に記載の半導体装置。 - 第1および第2のチャネル領域と、前記第1のチャネル領域の外側に位置する第1の高濃度不純物領域と、前記第2のチャネル領域の外側に位置する第2の高濃度不純物領域と、前記第1および第2のチャネル領域の間に位置する第3の高濃度不純物領域とを有する半導体層と、
前記半導体層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設けられ、前記第1および第2のチャネル領域上にそれぞれ設けられた第1および第2のゲート電極と、
前記第1の高濃度不純物領域と電気的に接続された第1の電極と、
前記第2の高濃度不純物領域と電気的に接続された第2の電極と
を有する薄膜トランジスタを備え、
前記半導体層は、
前記第1のチャネル領域と前記第1の高濃度不純物領域との間、および、前記第1のチャネル領域と前記第3の高濃度不純物領域との間にそれぞれ設けられ、前記第1、第2および第3の高濃度不純物領域の不純物濃度よりも低い不純物濃度を有する第1低濃度不純物領域と、
前記第2のチャネル領域と前記第2の高濃度不純物領域との間、および、前記第2のチャネル領域と前記第3の高濃度不純物領域との間にそれぞれ設けられ、前記第1、第2および第3の高濃度不純物領域の不純物濃度よりも低い不純物濃度を有する第2低濃度不純物領域と
をさらに有し、
前記第1低濃度不純物領域は何れも、その全体が前記第1のゲート電極と重なっており、前記第2低濃度不純物領域は前記第2のゲート電極と重なっていない半導体装置。 - 前記第1および第2のゲート電極は単一の導電膜から形成されている請求項4に記載の半導体装置。
- 前記薄膜トランジスタのチャネル方向と平行であり、かつ、ゲート電極の厚さ方向に沿った断面において、前記第1および第2のゲート電極は左右対称な形状を有している請求項4または5に記載の半導体装置。
- 薄膜トランジスタを備えた半導体装置の製造方法であって、
(a)基板上に島状の半導体層を形成する工程と、
(b)前記半導体層を覆うゲート絶縁膜を形成する工程と、
(c)前記半導体層の一部に第1の不純物イオンを第1のドーズ量で注入する工程であって、これにより、前記半導体層のうちチャネル領域となる部分の一方の端部に隣接するように第1の不純物イオン注入領域を形成する工程と、
(d)前記ゲート絶縁膜上に、前記半導体層のうちチャネル領域となる部分および前記第1の不純物イオン注入領域の少なくとも一部を覆うようにゲート電極を形成する工程と、
(e)前記ゲート電極を注入マスクとして、前記半導体層に第2の不純物イオンを第2のドーズ量で注入する工程であって、これにより、前記半導体層のうちチャネル領域となる部分の他方の端部に隣接するように第2の不純物イオン注入領域を形成する工程と、
(f)前記ゲート電極の前記第2の不純物イオン注入領域側の側面および前記第2の不純物イオン注入領域の一部を覆うマスクを形成する工程と、
(g)前記マスクおよび前記ゲート電極を注入マスクとして、前記第1および第2のドーズ量よりも高い第3のドーズ量で、前記半導体層に第3の不純物イオンを注入して、ソースおよびドレイン領域を形成する工程であって、これにより、前記第1の不純物イオン注入領域のうち前記ゲート電極で覆われ、前記第3の不純物イオンが注入されなかった領域が第1の低濃度不純物領域となり、前記第2の不純物イオン注入領域のうち前記マスクで覆われ、前記第3の不純物イオンが注入されなかった領域が第2の低濃度不純物領域となる工程と
を包含する製造方法。
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JP2000299469A (ja) * | 1999-02-12 | 2000-10-24 | Semiconductor Energy Lab Co Ltd | 半導体装置およびその作製方法 |
JP2002134751A (ja) * | 2000-10-20 | 2002-05-10 | Sharp Corp | アクティブマトリクス型表示装置およびその製造方法 |
JP2005072531A (ja) * | 2003-08-28 | 2005-03-17 | Sharp Corp | 薄膜トランジスタを備えた装置およびその製造方法 |
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KR100292767B1 (ko) * | 1992-09-25 | 2001-09-17 | 이데이 노부유끼 | 액정표시장치 |
US6777716B1 (en) * | 1999-02-12 | 2004-08-17 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor display device and method of manufacturing therefor |
JP4377640B2 (ja) * | 2003-09-19 | 2009-12-02 | 株式会社半導体エネルギー研究所 | 半導体装置及びその作製方法 |
JP2006269808A (ja) * | 2005-03-24 | 2006-10-05 | Mitsubishi Electric Corp | 半導体装置および画像表示装置 |
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2009
- 2009-01-20 CN CN2009801034055A patent/CN101925988A/zh active Pending
- 2009-01-20 US US12/864,955 patent/US20100327353A1/en not_active Abandoned
- 2009-01-20 WO PCT/JP2009/000169 patent/WO2009096148A1/ja active Application Filing
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Publication number | Priority date | Publication date | Assignee | Title |
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JP2000299469A (ja) * | 1999-02-12 | 2000-10-24 | Semiconductor Energy Lab Co Ltd | 半導体装置およびその作製方法 |
JP2002134751A (ja) * | 2000-10-20 | 2002-05-10 | Sharp Corp | アクティブマトリクス型表示装置およびその製造方法 |
JP2005072531A (ja) * | 2003-08-28 | 2005-03-17 | Sharp Corp | 薄膜トランジスタを備えた装置およびその製造方法 |
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US20100327353A1 (en) | 2010-12-30 |
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