WO2007004256A1 - 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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- WO2007004256A1 WO2007004256A1 PCT/JP2005/012059 JP2005012059W WO2007004256A1 WO 2007004256 A1 WO2007004256 A1 WO 2007004256A1 JP 2005012059 W JP2005012059 W JP 2005012059W WO 2007004256 A1 WO2007004256 A1 WO 2007004256A1
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- Prior art keywords
- layer
- metal
- metal layer
- forming
- semiconductor device
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 59
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 52
- 239000010410 layer Substances 0.000 claims abstract description 362
- 229910052751 metal Inorganic materials 0.000 claims abstract description 222
- 239000002184 metal Substances 0.000 claims abstract description 222
- 239000011229 interlayer Substances 0.000 claims abstract description 69
- 230000004888 barrier function Effects 0.000 claims abstract description 68
- 239000000758 substrate Substances 0.000 claims abstract description 17
- 238000005530 etching Methods 0.000 claims description 22
- 238000005498 polishing Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 abstract 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 21
- 229910052802 copper Inorganic materials 0.000 description 21
- 239000010949 copper Substances 0.000 description 21
- 229910052581 Si3N4 Inorganic materials 0.000 description 15
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 15
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 9
- 229910052710 silicon Inorganic materials 0.000 description 9
- 239000010703 silicon Substances 0.000 description 9
- 229920002120 photoresistant polymer Polymers 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 229910052715 tantalum Inorganic materials 0.000 description 7
- 238000007747 plating Methods 0.000 description 6
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 6
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 230000009977 dual effect Effects 0.000 description 5
- 229910052814 silicon oxide Inorganic materials 0.000 description 5
- 229910052801 chlorine Inorganic materials 0.000 description 4
- 239000000460 chlorine Substances 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000004544 sputter deposition Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 235000012907 honey Nutrition 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 239000010907 stover Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/52—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames
- H01L23/522—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames including external interconnections consisting of a multilayer structure of conductive and insulating layers inseparably formed on the semiconductor body
- H01L23/532—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames including external interconnections consisting of a multilayer structure of conductive and insulating layers inseparably formed on the semiconductor body characterised by the materials
- H01L23/53204—Conductive materials
- H01L23/53209—Conductive materials based on metals, e.g. alloys, metal silicides
- H01L23/53228—Conductive materials based on metals, e.g. alloys, metal silicides the principal metal being copper
- H01L23/53238—Additional layers associated with copper layers, e.g. adhesion, barrier, cladding layers
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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
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/321—After treatment
- H01L21/3213—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer
- H01L21/32133—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only
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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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76801—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing
- H01L21/76802—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing by forming openings in dielectrics
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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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76801—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing
- H01L21/76802—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing by forming openings in dielectrics
- H01L21/76816—Aspects relating to the layout of the pattern or to the size of vias or trenches
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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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76801—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing
- H01L21/76829—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing characterised by the formation of thin functional dielectric layers, e.g. dielectric etch-stop, barrier, capping or liner layers
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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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76841—Barrier, adhesion or liner layers
- H01L21/76843—Barrier, adhesion or liner layers formed in openings in a dielectric
- H01L21/76846—Layer combinations
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- H—ELECTRICITY
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- 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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76841—Barrier, adhesion or liner layers
- H01L21/7685—Barrier, adhesion or liner layers the layer covering a conductive structure
- H01L21/76852—Barrier, adhesion or liner layers the layer covering a conductive structure the layer also covering the sidewalls of the conductive 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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76877—Filling of holes, grooves or trenches, e.g. vias, with conductive material
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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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76885—By forming conductive members before deposition of protective insulating material, e.g. pillars, studs
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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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76841—Barrier, adhesion or liner layers
- H01L21/76843—Barrier, adhesion or liner layers formed in openings in a dielectric
- H01L21/76844—Bottomless liners
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
Definitions
- the present invention relates to a semiconductor device and a method for manufacturing the same, and more particularly to a semiconductor device having a barrier metal between a metal layer and an interlayer insulating film and a method for manufacturing the same.
- Multi-layer wiring technology is used in various semiconductor devices!
- various multilayer wiring technologies have been developed.
- the damascene technique disclosed in Non-Patent Document 1 is an example.
- copper is used as a plug metal in a contact hole formed in a wiring metal and an interlayer insulating film.
- a noria metal is provided between the plug metal and the interlayer insulating film.
- FIGS. 1 and 2 are cross-sectional views showing a method of manufacturing a multilayer wiring according to a conventional example.
- a lower wiring layer 16 is formed on a semiconductor substrate (not shown).
- the lower wiring layer 16 extends in the horizontal direction of FIG. 1 (a) and is mainly composed of copper.
- An interlayer insulating film (not shown) is formed between the lower wiring layers 16.
- a silicon nitride film 20 and an oxide silicon film 22 are formed as an interlayer insulating film 22 on the lower wiring layer 16.
- a contact hole is formed in the interlayer insulating film 22.
- a noria layer 24 is formed in the contact hole and on the interlayer insulating film 22. Copper is formed on the barrier layer 24 as a seed layer (not shown) by sputtering. Copper is formed on the seed layer by a mesh method.
- the interlayer insulating film 22 is polished and flattened by the CMP method. Thereby, the plug metal 26 is formed in the contact hole.
- a silicon nitride film 30 is formed as an etching stover on the interlayer insulating film 22.
- an oxide silicon film is formed as an interlayer insulating film 32 on the silicon nitride film 30.
- an opening is formed in the interlayer insulating film 32, a barrier layer 34, a seed layer (not shown) mainly composed of copper, and a wiring layer 34 are formed. Polish up to the insulation film 32. Thus, one wiring layer is completed. The multilayer wiring is completed by repeating the above steps.
- Non-Patent Document 1 Carter W. Kaanta and 11 others (Carter W. Kaanta), “DUAL DAMASCENE: A ULSI WIRING TECHNOLOGY”, VMIC Conference, IEEE, P144- P152
- the conventional example has the following problems.
- the same barrier layer force as that of the noria layer 24 between the plug metal 26 and the interlayer insulating film 22 is formed between the plug metal 26 and the lower wiring layer 16.
- a noria layer 34 is formed between the wiring layer 36 and the plug metal 26.
- the contact resistance between the wiring layer 36 and the plug metal 26 is large.
- an object of the present invention is to provide a semiconductor device capable of reducing contact resistance between stacked metal layers and a method for manufacturing the same.
- the present invention provides a first metal layer provided on a semiconductor substrate, an interlayer insulating film provided on the first metal layer, and an opening formed in the interlayer insulating film.
- a second metal layer provided in contact with the base layer and connected to the first metal layer; and formed between the second metal layer and the interlayer insulating film;
- a semiconductor device comprising: a first noria layer having different values.
- the present invention can be a semiconductor device in which the underlayer is the first metal layer.
- the contact resistance between the second metal layer and the first metal layer can be further reduced.
- the present invention may be a semiconductor device in which the underlayer is the second barrier layer.
- the second noria layer has a lower resistivity than the first noria layer.
- the second metal layer can be a semiconductor device having a main composition different from that of the first metal layer. According to the present invention, even when the main composition of the second metal layer and the first metal layer are different, the second barrier layer can be formed independently of the composition and film thickness of the first barrier layer. . Therefore, the contact resistance between the second metal layer and the first metal layer can be reduced.
- the present invention can be a semiconductor device in which the width of the first barrier layer decreases as it goes upward. According to the present invention, the coverage of the second metal layer in the opening can be improved.
- the present invention can be a semiconductor device in which the second metal layer includes at least one of a wiring layer and a plug metal. According to the present invention, the present invention can be applied to a plug metal of a multilayer wiring or a noria layer of a wiring layer. The present invention can also be applied to a dual damascene structure that can reduce the wiring layer manufacturing process.
- the present invention includes a step of forming a conductive film to be a first noria layer on a first metal layer formed on a semiconductor substrate, and etching the conductive film to form an opening.
- a method for manufacturing a semiconductor device since the opening of the interlayer insulating film is not covered with the first barrier layer, the coverage of the first noria layer on the side of the opening can be improved. Further, since no barrier layer is provided between the second metal layer and the first metal layer, the contact resistance between the second metal layer and the first metal layer can be reduced.
- the step of forming the second metal layer includes a step of forming a metal film to be a metal layer on the entire surface of the semiconductor substrate, and a step of polishing the metal film to the conductive film.
- the semiconductor device can be manufactured by the following method. According to the present invention, when the metal film is polished, the conductive film is harder to be polished than the metal film, so there are few problems such as dishing. Therefore, the surface of the second metal layer and the conductive film can be made flat.
- the second metal layer in the step of forming the second metal layer, is the first metal layer.
- a method for manufacturing a semiconductor device which is a step of forming the second metal layer in contact with the metal layer, can be employed. According to the present invention, the contact resistance between the second metal layer and the first metal layer can be further reduced.
- the present invention includes a step of forming a second barrier layer on the first metal layer, and the step of forming the conductive film includes the step of forming the conductive film on the second barrier layer. It can be set as the manufacturing method of the semiconductor device which is the process formed in this. According to the present invention, for example, the contact resistance between the second metal layer and the first metal layer can be reduced by making the second barrier layer a material having a lower resistivity than the first noria layer. it can.
- the present invention may be a method for manufacturing a semiconductor device in which the composition of the second barrier layer is different from that of the first barrier layer.
- the contact resistance between the second metal layer and the first metal layer is reduced by using a material having a composition having a lower resistivity than that of the first barrier layer. Can be made.
- the present invention can be a method for manufacturing a semiconductor device in which the second metal layer has a main composition different from that of the first metal layer. According to the present invention, even when the main composition of the second metal layer and the first metal layer are different, the second noria layer can be formed independently of the composition and film thickness of the first noria layer. it can. Therefore, the contact resistance between the second metal layer and the first metal layer can be reduced.
- the present invention can be a method for manufacturing a semiconductor device, wherein the step of forming the opening includes a step of etching the conductive film in a tapered shape. According to the present invention, it is possible to improve the coverage and coverage of the second metal layer in the opening.
- the present invention can be a method for manufacturing a semiconductor device, wherein the step of forming the first noria layer includes a step of etching the entire surface of the conductive film.
- the conductive film can be etched without using a photoresist when forming the first barrier layer. Therefore, the manufacturing process can be reduced.
- the present invention provides a method for manufacturing a semiconductor device, including a step of forming an interlayer insulating film on the first metal layer between the region where the second metal layer and the first noria layer are formed. It can be. According to the present invention, by forming the interlayer insulating film after forming the barrier layer, it is possible to improve the coverage of the noria layer on the side of the opening. [0024]
- the step of forming the interlayer insulating film is a step of forming a film thickness of a layer to be the interlayer insulating film larger than the film thickness of the second metal layer and the first barrier layer.
- the semiconductor device manufacturing method can be a process in which the layer to be the interlayer insulating film is polished to the second metal layer or the first barrier layer.
- the second metal layer is harder to be polished than the interlayer insulating film, and therefore there are few problems such as dishing. Therefore, the interlayer insulating film surface can be a flat surface.
- the step of forming the opening includes at least one of a step of forming a region to be a wiring layer in the conductive film and a step of forming a contact hole in the conductive film
- the step of forming the second metal layer is a semiconductor device manufacturing method including at least one of a step of forming a wiring layer in a region where the wiring layer is to be formed and a step of forming a plug metal in the contact hole. be able to.
- the present invention can be applied to a plug metal of a multilayer wiring or a noria layer of a wiring layer.
- the present invention can also be applied to a dual damascene structure that can reduce the wiring layer manufacturing process.
- FIG. 1 is a sectional view (No. 1) showing a method for manufacturing a multilayer wiring according to a conventional example.
- FIG. 2 is a sectional view (No. 2) showing the method for manufacturing a multilayer wiring according to the conventional example.
- FIG. 3 is a sectional view (No. 1) showing the method for manufacturing the multilayer wiring in accordance with the first embodiment.
- FIG. 4 is a sectional view (No. 2) showing the method for manufacturing the multilayer wiring in accordance with the first embodiment.
- FIG. 5 is a sectional view (No. 3) showing the method for manufacturing the multilayer wiring in accordance with the first embodiment.
- FIG. 6 is a sectional view (No. 1) showing the method for manufacturing the multilayer wiring in accordance with the second embodiment.
- FIG. 7 is a sectional view (No. 2) showing the method for manufacturing the multilayer wiring in accordance with the second embodiment.
- FIG. 8 is a sectional view (No. 1) showing the method for manufacturing the multilayer wiring in accordance with Example 3.
- FIG. 9 is a sectional view (No. 2) showing the method for manufacturing the multilayer wiring in accordance with the third embodiment.
- FIG. 10 is a sectional view (No. 1) showing the method for manufacturing the multilayer wiring according to Embodiment 4.
- FIG. 11 is a sectional view (No. 2) showing the method for manufacturing the multilayer wiring in accordance with the fourth embodiment.
- FIGS. 3 to 5 are cross-sectional views illustrating the method for manufacturing the multilayer wiring according to the first embodiment.
- a lower wiring layer 16 is formed on a semiconductor substrate (not shown).
- the lower wiring layer 16 extends in the horizontal direction of FIG. 3 (a), and is a lower wiring metal, mainly composed of copper! /.
- a lower interlayer insulating film (not shown) is formed.
- a silicon nitride film 20 and a conductive film 23 to be the noria layer 24 are formed using tantalum (Ta).
- tantalum which functions well as the plug metal noria
- the film thickness of the conductive film 23 is slightly thicker than the final target film thickness. 200nm force and 400nm power.
- the conductive film 23 is etched using a photoresist (not shown) as a mask to reach the lower wiring layer 16, and a contact hole 40 having a diameter of about 100 to 200 nm is formed.
- a photoresist not shown
- the silicon nitride film 20 and etching selectivity are provided, and the etching of the conductive film 23 is stopped by the silicon nitride film 20. Thereafter, the silicon nitride film 20 is etched.
- the contact hole 40 can be formed almost vertically and stopped by the silicon nitride film 20 by using, for example, a chlorine (C1) -based gas.
- a metal film 25 to be a plug metal 26 is formed in the contact hole 40 and on the conductive film 23 over the entire surface of the semiconductor substrate using a plating method.
- the metal film 25 is mainly composed of copper. Since the lower wiring layer 16 is made of copper, a seed layer for plating the metal film 25 is not necessary, but a seed layer may be formed.
- the seed layer is a metal such as copper, for example, and is formed by sputtering before the metal film 25 is plated. As shown in FIG. 3D, the metal film 25 is polished up to the conductive film 23 by CMP. Thereby, the plug metal 26 is formed.
- a photoresist 42 having a predetermined opening is formed on plug metal 26 and conductive film 23. Other than the area around plug metal 26 using photoresist 42 as a mask
- the conductive film 23 is etched. Thereby, the noria layer 24 is formed. Etching of the conductive film 23 is performed in the same manner as in FIG. As a result, the etching can be performed almost vertically, and the etching can be stopped at the silicon nitride film 20.
- the photoresist 42 is removed.
- the barrier layer 24 preferably has a width L force S50 to 200 nm and a height H of 200 to 400 nm. The width L is preferably selected in a timely manner in consideration of noria characteristics and contact hole resistance.
- the minimum width to be the interlayer insulating film 22 between the plug metals 26 can be set to 100 to 200 nm. 3 to 5, since the region having the wiring layer 34 is described, the width of the interlayer insulating film 22 is described wider than 200 nm.
- the plug metal 26 and the barrier layer 24 are covered on the lower wiring layer 16 and the lower interlayer insulating film between the regions where the plug metal 26 and the barrier layer 24 are formed.
- an oxide silicon film 21 to be the interlayer insulating film 22 is formed.
- the silicon oxide film 21 is formed using the TEOS method so that the surface force on the region between the plug metal 26 and the region where the barrier layer 24 is formed is higher than the surface of the plug metal 26 or noria layer 24.
- the silicon oxide film 21 is polished up to the plug metal 26 or the noria layer 24 using the CMP method. Thereby, the first interlayer insulating film 22 is formed.
- a silicon nitride film 30 is formed.
- a conductive film 33 is formed on the interlayer insulating film 22, the plug metal 26 and the barrier layer 24 using tantalum (Ta). In addition to tantalum, the same material as the conductive film 23 can be used.
- the region in the conductive film 33 where the wiring layer 36 is to be formed is etched in the same manner as in FIG. Thereafter, the silicon nitride film 30 is etched.
- the noria layer 24 in FIGS. 3 (c) to 4 (d) is the barrier layer 34
- the plug metal 26 is the wiring layer 36
- the interlayer insulating film 22 is the interlayer insulating film 32. The process is performed.
- the wiring layer 36 has a height of about 250 nm and preferably ranges from 200 to 400.
- the minimum wiring width and the minimum interval are, for example, about 250 ⁇ m, and are preferably selected in the range of 100 ⁇ to 1 / ⁇ ⁇ as appropriate.
- Example 1 the lower wiring layer 16 (first metal layer) provided on the semiconductor substrate; On interlayer insulating film 22 provided on lower wiring layer 16 (first metal layer), and on lower wiring layer 16 (underlayer) in contact hole 40 (opening) formed in interlayer insulating film 22 And a lower wiring layer 16 (a plug metal 26 (second metal layer) connected to the first metal layer) and a plug metal 26 (second metal layer) and the lower wiring layer.
- No barrier layer 24 (first metal layer) is formed between 16 (first metal layer) and a noa layer between the plug metal 26 (second metal layer) and the interlayer insulating film 22.
- 24 the first noria layer is formed, so that no noria layer 24 is provided between the plug metal 26 and the lower wiring layer 16, and therefore, there is no gap between the plug metal 26 and the lower wiring layer 16. Contact resistance can be reduced.
- a plug metal 26 (first metal layer) provided on the semiconductor substrate, an interlayer insulating film 32 provided on the plug metal 26, a wiring layer formed in the interlayer insulating film 32, and A wiring layer 36 (second metal layer) provided in contact with the plug metal 26 (underlying layer) and connected to the plug metal 26 (first metal layer) in the region (opening) to be formed; Yes.
- the barrier layer 34 (first barrier layer) is not formed between the wiring layer 36 (second metal layer) and the plug metal 26 (first metal layer).
- a barrier layer 34 (first NORA layer) is formed between the wiring layer 36 (second metal layer) and the interlayer insulating film 32.
- Example 1 the conductive film 23 other than the region around the plug metal 26 (second metal layer) is etched to form the noria layer 24 (first noria layer).
- the coverage on the side of the contact hole can be improved as compared with the conventional method in which the NOR layer 24 is sputtered into the contact hole. Therefore, even if the contact hole is miniaturized, it is possible to form the barrier layer 24 without reducing the covering property.
- the barrier layer 24 is not provided between the plug metal 26 and the lower wiring layer 16, the contact resistance between the plug metal 26 and the lower wiring layer 16 can be reduced.
- the plug metal 26 (second metal layer) can be formed in contact with the lower wiring layer 16 (first metal layer). That is, the lower layer in contact with the plug metal 26 (second metal layer) can be the lower wiring layer 16 (first metal layer). Thereby, the contact resistance between the plug metal 26 and the lower wiring layer 16 can be further reduced. Also, the plug metal 26 When the main composition is the same as that of the lower wiring layer 16, a seed layer for plating is not necessary. Therefore, the manufacturing process can be reduced.
- a metal film 25 is formed over the entire surface of the semiconductor substrate, and as shown in FIG. 3D, the metal film 25 is polished up to the conductive film 23 using the CMP method.
- the plug metal 26 (second metal layer) can be formed.
- the conductive film 23 is harder to be polished than the metal film 25, so that there are few problems such as dishing. Therefore, the surfaces of the plug metal 26 and the conductive film 23 can be made flat.
- the lower wiring layer 16 (first metal) between regions where the plug metal 26 (second metal layer) and the barrier layer 24 (first barrier layer) are formed.
- An interlayer insulating film 22 can be formed on the layer) and the lower interlayer insulating film. By forming the interlayer insulating film 22 after forming the barrier layer 24, it is possible to improve the coverage of the contact hole side portion of the noria layer 24.
- the thickness of the silicon oxide film 21 (the layer to be the interlayer insulating film) is set to the plug metal 26 (second metal layer) and the barrier layer 24 (first layer).
- the silicon oxide film 21 is polished to the plug metal 24 (second metal layer) or the noria layer 24 (first noria layer). To do.
- the interlayer insulating film 22 can be formed.
- the plug metal 24 is less likely to be polished than the oxide silicon film 21, so that there are few problems such as dishing. Therefore, the surface of the interlayer insulating film 22 can be a flat surface.
- the second embodiment is an example in which the noria layer 24 of the first embodiment is replaced with a barrier layer 24a whose width decreases in the upward direction.
- 6 and 7 are cross-sectional views illustrating the method for manufacturing the multilayer wiring according to the second embodiment.
- a lower wiring layer 16 As in FIG. 3 (a) of the first embodiment, a lower wiring layer 16, a silicon nitride film 20, and a conductive film 23 are formed on a semiconductor substrate (not shown).
- the photoresist (not shown) as a mask, the conductive film 23 is etched into a taper shape to form a contact hole 40a reaching the lower wiring layer 16.
- the contact hole 40a can be formed in a tapered shape by using, for example, a chlorine-based gas.
- the upper and lower diameters of the contact hole 40a are, for example, 200 nm and 150 nm, respectively. afterwards Then, the silicon nitride film 20 is etched.
- the metal film 25 is formed using a plating method.
- the metal film 25 is mainly composed of copper.
- the metal film 25 is polished up to the conductive film 23 by CMP as in FIG. 3D. Thereby, the plug metal 26 is formed.
- the entire surface of the conductive film 23 is etched to form a barrier layer 24a.
- the plug metal 24a Since the contact surface between the plug metal 26 and the conductive film 23 is tapered, the plug metal 24a remains.
- a chlorine-based gas is used for etching the conductive film 23.
- the conductive film 23 can be selectively etched with respect to the plug metal 26 and can be etched almost vertically.
- the noria layer 24a preferably has a height force of S200 to 400 nm and a lower width of 5 to 50 nm.
- an interlayer insulating film 22 is formed in the same manner as in FIG. 4 (c) and FIG. 4 (d) of the first embodiment.
- a silicon nitride film 30 and a conductive film 33 are formed as in FIGS. 5 (a) and 5 (b).
- the wiring layer 36, the noria layer 34, and the interlayer insulating film 32 are formed. This completes one layer of multilayer wiring. By repeating the same process, the multilayer wiring according to Example 2 is completed.
- the conductive film 23 is etched into a tapered shape to form a contact hole 40a (opening).
- the coverage of the metal film 25 and the coverage of the plug metal 26 in the contact hole 40a are improved.
- the entire surface of the conductive film 23 is etched to form the barrier layer 40a (first noria layer).
- the width of the noria layer 24a (first noria layer) can be reduced as it goes upward.
- the photoresist 42 Example 1 FIG. 4 (a) for etching the conductive film 23 becomes unnecessary as compared with Example 1. Therefore, the manufacturing process can be reduced.
- Example 3 is an example in which the lower wiring layer 14 has a composition different from that of the plug metal 26.
- 8 and 9 are cross-sectional views illustrating the method for manufacturing the multilayer wiring according to the third embodiment.
- an active element such as a transistor (illustrated) is formed on the silicon semiconductor substrate 10. Not) is formed.
- An oxide silicon film is formed as an interlayer insulating film 12 on the semiconductor substrate 10.
- a lower wiring layer 14 mainly composed of tundane is formed as a wiring for connecting the active element and the wiring layer.
- Titanium nitride is formed as a second barrier layer 18 on the interlayer insulating film 12 and the lower wiring layer 14.
- a conductive film 23 mainly composed of tantalum is formed on the second noria layer 18. The conductive film 23 can be made of the same material as in Example 1 other than tantalum.
- a contact hole 40a reaching the second barrier layer 18 is formed in the conductive film 23.
- the contact hole 40a can be formed in a tapered shape by using, for example, a chlorine-based gas.
- the second barrier layer 18 can be selectively etched.
- a seed layer 27 mainly composed of copper is formed in the contact hole 4Oa and on the conductive film 23 by sputtering.
- a metal film is formed using a plating method as in FIG. 3 (c) of the first embodiment.
- the metal film is polished up to the conductive film 23 using the CMP method. As a result, the plug metal 26 is formed.
- the entire surface of conductive film 23 is etched to form barrier layer 24a. Etching of the conductive film 23 is the same as in Example 2. Thereafter, the second noria layer 18 is etched.
- the interlayer insulating film 32, the barrier layer 34, and the wiring layer 36 are formed in the same manner as in FIGS. 4C to 5C of the first embodiment. Thus, one layer of multilayer wiring is completed. The formation of the upper wiring layer is performed in the same manner as in Example 1 or Example 2 to complete the multilayer wiring.
- the second noria layer 18 is formed on the lower wiring layer 14 (first metal layer), and the conductive film 23 is formed on the second noria layer 18.
- the second wiring layer 14 (first metal layer) and the plug metal 26 (second metal layer) are provided with a second noria layer 18 having a composition different from that of the first noir layer 27. ing. That is, the base layer in contact with the plug metal 26 (second metal layer) can be used as the second barrier layer 18.
- the second noria layer 18 is made of a material having a lower resistivity than that of the first noria layer 27, so that the contact resistance between the lower wiring layer 14 and the plug metal 26 can be reduced.
- the lower wiring layer 14 is mainly composed of tungsten, and the plug metal 26 is mainly composed of copper. It is said.
- the plug metal 26 differs from the lower wiring layer 14 in the main composition.
- the plug metal 26 and the lower wiring layer 14 are mainly composed of the same copper. Therefore, there is no need for a noria layer between the lower wiring layer 14 and the plug metal 26.
- the diffusion of copper into the lower wiring layer 18 is small compared to the diffusion of copper into the interlayer insulating film 22. Therefore, the composition of the second noria layer 18 is different from that of the first noria layer 24. As a result, although the barrier property for preventing copper diffusion is low, the contact resistance between the lower wiring layer 18 and the plug metal 26 can be reduced. Furthermore, the thickness of the second noria layer 18 can be made thinner than that of the first noria layer 24a. This also has the same effect. As described above, the second barrier layer 18 can be formed independently of the composition and film thickness of the first noria layer 26a. As the second barrier layer 18, the same material as that of the first noria layer described in the first embodiment can be used.
- Example 4 is an example of a dual damascene formed by burying a contact hole and a wiring layer in a barrier layer.
- 10 and 11 are cross-sectional views illustrating the method for manufacturing the multilayer wiring according to the fourth embodiment.
- a lower wiring layer 16, a silicon nitride film 20, and a conductive film 23 are formed on a semiconductor substrate (not shown).
- the film thickness of the conductive film 23 is about 500 nm.
- the region 44 to be the wiring layer of the conductive film 23 is etched to a depth of about 250 nm. Etching is performed in the same manner as in FIG.
- a contact hole 46 is formed in the conductive film 23.
- the contact hole 46 is formed by the same method as in FIG. Figure 10 (b) and (c) can be formed in reverse.
- a metal film 25 having a main composition of copper is formed on the entire surface by a plating method.
- the metal film 25 is polished up to the conductive film 23 using the CMP method.
- the plug metal 26a and the wiring layer 36a are formed.
- process diagram 11 (b) a photoresist is formed in a predetermined region, and the conductive film is etched. Etching is performed in the same way as in Fig. 4 (a). Thereby, the barrier layer 24b is formed.
- an oxide silicon film is formed up to the barrier layer 24b as in FIG. 4 (c). As in FIG.
- the silicon oxide film is polished to the barrier layer 24 using the CMP method.
- the NOR layer 24b (first NOR layer) is added between the plug metal 26a and the interlayer insulating film 22 and between the wiring layer 36a and the interlayer insulating film 22, It is formed in the region below the layer 36a.
- the wiring layer 36a extends in the depth direction, and a barrier layer 24b is formed in a region below the wiring layer 36a.
- the plug metal 26 a is formed only in the region connected to the lower wiring layer 16.
- the present invention can be applied to a dual damascene structure. Therefore, since the plug metal 26a and the wiring layer 36a in the contact hole are formed at the same time, the manufacturing process can be reduced.
- the manufacturing method according to Examples 1 to 4 may be applied to only one wiring layer or a plurality of layers.
- the wiring layer and the plug metal may be a force using a metal mainly containing copper or other metals.
- a metal mainly containing copper or other metals may be used.
- oxide silicon film is used as the interlayer insulating film, other insulating films may be used.
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Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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JP2007523278A JP4965443B2 (ja) | 2005-06-30 | 2005-06-30 | 半導体装置の製造方法 |
PCT/JP2005/012059 WO2007004256A1 (ja) | 2005-06-30 | 2005-06-30 | 半導体装置およびその製造方法 |
US11/479,379 US8008778B2 (en) | 2005-06-30 | 2006-06-30 | Semiconductor device |
US13/217,172 US9570396B2 (en) | 2005-06-30 | 2011-08-24 | Method of forming a damascene interconnect on a barrier layer |
US15/430,806 US20170154851A1 (en) | 2005-06-30 | 2017-02-13 | Method of forming a damascene interconnect on a barrier layer |
Applications Claiming Priority (1)
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PCT/JP2005/012059 WO2007004256A1 (ja) | 2005-06-30 | 2005-06-30 | 半導体装置およびその製造方法 |
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US11/479,379 Continuation-In-Part US8008778B2 (en) | 2005-06-30 | 2006-06-30 | Semiconductor device |
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WO2007004256A1 (ja) * | 2005-06-30 | 2007-01-11 | Spansion Llc | 半導体装置およびその製造方法 |
KR20160073796A (ko) * | 2014-12-17 | 2016-06-27 | 에스케이하이닉스 주식회사 | 전자 장치 및 그 제조 방법 |
US10163758B1 (en) | 2017-10-30 | 2018-12-25 | Taiwan Semiconductor Manufacturing Company Ltd. | Semiconductor structure and manufacturing method for the same |
KR20210094188A (ko) * | 2020-01-20 | 2021-07-29 | 삼성디스플레이 주식회사 | 표시 장치 및 표시 장치의 제조 방법 |
US11430753B2 (en) * | 2020-07-08 | 2022-08-30 | Raytheon Company | Iterative formation of damascene interconnects |
CN115831764A (zh) * | 2022-12-15 | 2023-03-21 | 成都海光集成电路设计有限公司 | 一种基板中过孔的制作方法、基板及芯片 |
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JP2004014967A (ja) * | 2002-06-11 | 2004-01-15 | Sony Corp | 半導体装置の製造方法及び半導体装置 |
JP2004023030A (ja) * | 2002-06-20 | 2004-01-22 | Matsushita Electric Ind Co Ltd | 半導体装置の製造方法 |
JP2004119698A (ja) * | 2002-09-26 | 2004-04-15 | Seiko Epson Corp | 半導体装置およびその製造方法 |
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US4924295A (en) * | 1986-11-28 | 1990-05-08 | Siemens Aktiengesellschaft | Integrated semi-conductor circuit comprising at least two metallization levels composed of aluminum or aluminum compounds and a method for the manufacture of same |
US5380678A (en) * | 1991-03-12 | 1995-01-10 | Yu; Chang | Bilayer barrier metal method for obtaining 100% step-coverage in contact vias without junction degradation |
DE69533823D1 (de) * | 1994-12-29 | 2005-01-05 | St Microelectronics Inc | Elektrische Verbindungsstruktur auf einer integrierten Schaltungsanordnung mit einem Zapfen mit vergrössertem Kopf |
JPH10242269A (ja) * | 1997-02-27 | 1998-09-11 | Toshiba Corp | 半導体装置の製造方法 |
EP0940652B1 (en) * | 1998-03-05 | 2004-12-22 | Nippon Telegraph and Telephone Corporation | Surface shape recognition sensor and method of fabricating the same |
US6433436B1 (en) * | 1999-05-26 | 2002-08-13 | International Business Machines Corporation | Dual-RIE structure for via/line interconnections |
KR20010019643A (ko) * | 1999-08-28 | 2001-03-15 | 윤종용 | 저유전율 절연막을 갖는 다층 금속배선의 형성방법 |
KR100404942B1 (ko) * | 2000-06-20 | 2003-11-07 | 주식회사 하이닉스반도체 | 반도체 소자의 금속 배선 형성 방법 |
US6261963B1 (en) * | 2000-07-07 | 2001-07-17 | Advanced Micro Devices, Inc. | Reverse electroplating of barrier metal layer to improve electromigration performance in copper interconnect devices |
US6329234B1 (en) * | 2000-07-24 | 2001-12-11 | Taiwan Semiconductor Manufactuirng Company | Copper process compatible CMOS metal-insulator-metal capacitor structure and its process flow |
JP2002198443A (ja) * | 2000-12-26 | 2002-07-12 | Nec Corp | 半導体装置及びその製造方法 |
US6448654B1 (en) * | 2001-01-29 | 2002-09-10 | Advanced Micro Devices, Inc. | Ultra thin etch stop layer for damascene process |
US6387798B1 (en) * | 2001-06-25 | 2002-05-14 | Institute Of Microelectronics | Method of etching trenches for metallization of integrated circuit devices with a narrower width than the design mask profile |
US6413815B1 (en) * | 2001-07-17 | 2002-07-02 | Macronix International Co., Ltd. | Method of forming a MIM capacitor |
US6867131B2 (en) * | 2002-08-29 | 2005-03-15 | Micron Technology, Inc. | Apparatus and method of increasing sram cell capacitance with metal fill |
US6787458B1 (en) * | 2003-07-07 | 2004-09-07 | Advanced Micro Devices, Inc. | Polymer memory device formed in via opening |
US7259090B2 (en) * | 2004-04-28 | 2007-08-21 | Taiwan Semiconductor Manufacturing Co., Ltd. | Copper damascene integration scheme for improved barrier layers |
WO2007004256A1 (ja) * | 2005-06-30 | 2007-01-11 | Spansion Llc | 半導体装置およびその製造方法 |
-
2005
- 2005-06-30 WO PCT/JP2005/012059 patent/WO2007004256A1/ja active Application Filing
- 2005-06-30 JP JP2007523278A patent/JP4965443B2/ja active Active
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2006
- 2006-06-30 US US11/479,379 patent/US8008778B2/en not_active Expired - Fee Related
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2011
- 2011-08-24 US US13/217,172 patent/US9570396B2/en active Active
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2017
- 2017-02-13 US US15/430,806 patent/US20170154851A1/en not_active Abandoned
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JP2004014967A (ja) * | 2002-06-11 | 2004-01-15 | Sony Corp | 半導体装置の製造方法及び半導体装置 |
JP2004023030A (ja) * | 2002-06-20 | 2004-01-22 | Matsushita Electric Ind Co Ltd | 半導体装置の製造方法 |
JP2004119698A (ja) * | 2002-09-26 | 2004-04-15 | Seiko Epson Corp | 半導体装置およびその製造方法 |
Also Published As
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US9570396B2 (en) | 2017-02-14 |
JPWO2007004256A1 (ja) | 2009-01-22 |
US20110306201A1 (en) | 2011-12-15 |
US20070001311A1 (en) | 2007-01-04 |
JP4965443B2 (ja) | 2012-07-04 |
US8008778B2 (en) | 2011-08-30 |
US20170154851A1 (en) | 2017-06-01 |
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