WO2003071531A1 - Sputtering target for phase-change memory, film for phase change memory formed by using the target, and method for producing the target - Google Patents
Sputtering target for phase-change memory, film for phase change memory formed by using the target, and method for producing the target Download PDFInfo
- Publication number
- WO2003071531A1 WO2003071531A1 PCT/JP2002/012739 JP0212739W WO03071531A1 WO 2003071531 A1 WO2003071531 A1 WO 2003071531A1 JP 0212739 W JP0212739 W JP 0212739W WO 03071531 A1 WO03071531 A1 WO 03071531A1
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- WIPO (PCT)
- Prior art keywords
- target
- phase change
- change memory
- composition
- sputtering
- Prior art date
Links
- 230000015654 memory Effects 0.000 title claims abstract description 85
- 230000008859 change Effects 0.000 title claims abstract description 67
- 238000005477 sputtering target Methods 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 239000000203 mixture Substances 0.000 claims abstract description 48
- 229910052714 tellurium Inorganic materials 0.000 claims abstract description 38
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 claims abstract description 37
- 229910052787 antimony Inorganic materials 0.000 claims abstract description 33
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 claims abstract description 33
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910052711 selenium Inorganic materials 0.000 claims abstract description 23
- 239000011669 selenium Substances 0.000 claims abstract description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- 239000002994 raw material Substances 0.000 claims description 13
- 229910052732 germanium Inorganic materials 0.000 claims description 12
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 239000007789 gas Substances 0.000 claims description 10
- 239000010453 quartz Substances 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- 238000004544 sputter deposition Methods 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 229910052738 indium Inorganic materials 0.000 claims description 8
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 8
- 238000002844 melting Methods 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 229910052717 sulfur Inorganic materials 0.000 claims description 7
- 239000011593 sulfur Substances 0.000 claims description 7
- 238000004090 dissolution Methods 0.000 claims description 6
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 claims description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 4
- 229910052733 gallium Inorganic materials 0.000 claims description 4
- 229910052718 tin Inorganic materials 0.000 claims description 4
- 229910052723 transition metal Inorganic materials 0.000 claims description 4
- 150000003624 transition metals Chemical class 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- 239000012535 impurity Substances 0.000 abstract description 22
- 238000002425 crystallisation Methods 0.000 abstract description 16
- 230000008025 crystallization Effects 0.000 abstract description 16
- 238000005204 segregation Methods 0.000 abstract description 7
- 230000009467 reduction Effects 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000012071 phase Substances 0.000 description 49
- 239000010408 film Substances 0.000 description 17
- 239000002253 acid Substances 0.000 description 15
- 230000003287 optical effect Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 239000010409 thin film Substances 0.000 description 7
- 238000004140 cleaning Methods 0.000 description 6
- 229910052709 silver Inorganic materials 0.000 description 6
- 239000004332 silver Substances 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 150000004770 chalcogenides Chemical class 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 2
- 150000001342 alkaline earth metals Chemical class 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000005219 brazing Methods 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 229910052984 zinc sulfide Inorganic materials 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229910052770 Uranium Inorganic materials 0.000 description 1
- 239000005083 Zinc sulfide Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000011978 dissolution method Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000013077 target material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/34—Sputtering
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/34—Sputtering
- C23C14/3407—Cathode assembly for sputtering apparatus, e.g. Target
- C23C14/3414—Metallurgical or chemical aspects of target preparation, e.g. casting, powder metallurgy
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
- G11B7/2433—Metals or elements of Groups 13, 14, 15 or 16 of the Periodic Table, e.g. B, Si, Ge, As, Sb, Bi, Se or Te
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
- G11B7/266—Sputtering or spin-coating layers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
- G11B2007/24302—Metals or metalloids
- G11B2007/24314—Metals or metalloids group 15 elements (e.g. Sb, Bi)
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
- G11B2007/24302—Metals or metalloids
- G11B2007/24316—Metals or metalloids group 16 elements (i.e. chalcogenides, Se, Te)
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N70/00—Solid-state devices having no potential barriers, and specially adapted for rectifying, amplifying, oscillating or switching
- H10N70/011—Manufacture or treatment of multistable switching devices
- H10N70/021—Formation of switching materials, e.g. deposition of layers
- H10N70/026—Formation of switching materials, e.g. deposition of layers by physical vapor deposition, e.g. sputtering
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N70/00—Solid-state devices having no potential barriers, and specially adapted for rectifying, amplifying, oscillating or switching
- H10N70/20—Multistable switching devices, e.g. memristors
- H10N70/231—Multistable switching devices, e.g. memristors based on solid-state phase change, e.g. between amorphous and crystalline phases, Ovshinsky effect
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N70/00—Solid-state devices having no potential barriers, and specially adapted for rectifying, amplifying, oscillating or switching
- H10N70/801—Constructional details of multistable switching devices
- H10N70/881—Switching materials
- H10N70/882—Compounds of sulfur, selenium or tellurium, e.g. chalcogenides
- H10N70/8828—Tellurides, e.g. GeSbTe
Definitions
- Sputtering target for phase change memory film for phase change memory formed using the target, and method for producing the target
- the present invention reduces the impurity elements that affect the crystallization rate as much as possible, reduces the deviation of the composition of the target from the target composition, and further suppresses the compositional segregation of the composition of the phase change memory.
- the present invention relates to a sputtering target for a phase change type memory for use in memory with improved writing characteristics and a crystallization rate, a film for phase change memory formed using the target, and a method for manufacturing the above-mentioned packaging. Background art
- optical disc technology capable of memory and reproduction without the need for magnetic heads has been developed and is rapidly attracting attention.
- the optical disc is divided into three types: read-only type, write-once type, and rewritable type. Particularly, a phase change type used in the write-once type or the rewritable type attracts attention.
- a phase change optical disk heats and raises the temperature of a memory thin film on a substrate by laser irradiation and causes crystallographic phase change (amorphous crystal) in the structure of the memory thin film to reproduce information and memory. More specifically, information is reproduced by detecting a change in reflectance resulting from a change in optical constant between the phases.
- the above-mentioned phase change is performed by the irradiation of a laser beam having a diameter of 1 to several.
- phase change optical discs have high melting points of zinc sulfide and key oxide (ZnS ⁇ S i 0 2 ) systems on both sides of memory thin film layers such as Ge—Sb—Te and In—Sb—Te systems.
- Antimony (Sb), tellurium (Te) or selenium (S e) is an important constituent element of the above optical memory media, as it is used as a four-layer structure with an aluminum alloy reflection film sandwiched between protective layers of dielectrics. It is.
- Non-volatile phase change memory in which a chalcogenide thin film is formed by sputtering, an electrode is brought into contact with it, and a current is supplied to the electrode to cause chalcogenide phase change.
- Non-volatile memory using such a method is generally called PRAM or onicUM (Ovonic Unified Memories).
- the region to be heated is narrow, with device dimensions of 50 ⁇ 200 nm 2 reaching 600 ° C. in the middle, but there is data that the temperature rises only up to 100 ° C. at a distance of 100 nm.
- Crystalline chalcogenide has low resistance, but amorphous one has high resistance. And in either state, the characteristics reverse when the threshold voltage is exceeded.
- OUM takes advantage of these characteristics and is easy to integrate with non-volatility, high density, low voltage, low power consumption, 10 12 rewrite cycles, nondestructive read out, Si process, Has many advantages such as unified memory.
- Both phase change optical discs and UM use chalcogenide sputtered thin films of elements such as anthimon, tellurium and selenium, and it is necessary to give due consideration to the characteristics of the material.
- the memory thin film layer which is one such phase change memory one medium, is usually formed by the sputtering method.
- a target consisting of a positive electrode and a negative electrode is made to face each other, and a high voltage is applied between these substrates and the target under an inert gas atmosphere to generate an electric field.
- the positive ions in this plasma collide with the surface of the target (negative electrode) to knock out target constituent atoms, and the ejected atoms face each other. It is based on the principle that a film is formed by adhering to the substrate surface.
- the present invention segregates and concentrates in the vicinity of the interface between the memory point and the non-memory part, and reduces as much as possible the impurities that cause the decrease in the number of rewrites, in particular the impurity elements that affect the crystallization rate.
- a sputtering target for phase change memory capable of improving the rewriting characteristics of the phase change memory and the crystallization rate by reducing the composition deviation of the phase and the segregation in the spring, and using the target. It is an object of the present invention to provide a formed film for phase change memory and a method of manufacturing the same.
- the present invention is based on this finding.
- a phase consisting of a ternary or more element, having as a main component one or more components selected from antimony, tellurium or selenium, and having a composition deviation of ⁇ 1.0 at% or less with respect to the target composition.
- phase change type memory for general use sputtering target described in each of the above 1 to 4 characterized in that the average grain size of the target is 50 m or less and the relative density is 90% or more. Phase change memory single-use film formed using a target
- Sputtering getter for phase change type memory as described in each of 1 to 5 above, characterized in that it contains one or more selected from transition metals, gallium, germanium, indium and tin as additives.
- the present invention further provides
- a method for producing a sputtering material for phase change type memory according to the above 8 characterized by using high purity quartz having an alkali component of 1 O ppm or less and OH of 5 p pm or less.
- a method of producing a sputtering target for phase change memory according to any of the above 7 to 9, wherein the purity of the raw material before dissolution is 99. 999 wt% or higher.
- the target material for the optical disk memory layer has been sufficiently used even at a purity of 3 N 5 to 4 N level, but the function has been improved with the recent trend toward high-speed memory and minute spots due to the use of short wavelength laser. The evening get was required. Impurities in the target are segregated and concentrated near the interface between the memory point and the non-memory part, causing a decrease in the number of rewrites. In addition, when many impurities are added, it takes time to prevent mutual diffusion of atoms when changing from an amorphous state in which each constituent element is distributed fairly uniformly to a crystalline state, and the crystallization rate is slow.
- alloy-based targets based on antimony, tellurium or selenium which are recently used as recording materials using crystalline phase change, aim to increase the number of rewrites, to achieve high-speed recording, and to increase the capacity.
- miniaturization of the recording portion it is necessary to reduce as much as possible the composition deviation of the target and the composition segregation in the target, and to achieve high purification.
- alkali metals and alkaline earth metals which have high diffusion and mobility, are problematic.
- reduction of these elements is important from the viewpoint of corrosion resistance as well, and high corrosion resistance can be maintained against the environment.
- impurities such as radioactive elements such as U and T h because they cause malfunction when they are used in phase change memory.
- the deviation of the film composition of the phase change memory from the target composition affects the rewrite characteristics and the crystallization rate, and in particular, the crystallization rate has a large effect. Therefore, it is necessary to further reduce the compositional deviation of the main component and the subcomponent. Control of the composition of the target is extremely important, since the target composition deviation directly leads to the film composition deviation.
- the present invention is a sputtering target for a phase change type memory, consisting mainly of one or more components selected from antimony, tellurium or selenium and consisting of elements of ternary system or more. Is less than ⁇ 1.0 at%.
- the composition A i (wt%) of each component element excluding the main component When the average value is A (wt%), it is a sputtering target for phase change type memory with
- the sputtering target for phase change memory according to the present invention contains one or more selected from transition metals, gallium, germanium, indium and tin as auxiliary components.
- the film for phase change memory formed using the target reduces compositional deviation and compositional eccentricity of the duvet, and as a result, the accuracy of the target composition is improved, and the reproducibility is improved. It became possible to improve the rewriting characteristics and the crystallization speed significantly.
- the purity of the target is 99.595 wt% or more excluding gas components, and the total of gas components carbon, nitrogen, oxygen and sulfur should be 700 ppm or less.
- the gas component contained in the flat get adversely affects particle generation during sputtering and is also taken into the film, and also affects the rewrite characteristics, crystallization temperature, and crystallization rate. In the present invention, these problems can be solved.
- the average crystal grain size is 50 m or less and the relative density is 90% or more.
- Antimony, tellurium and selenium have not been used in the past, because they are very fragile, acid pickling causes acid to remain in the interior and causes oxygen to increase in later steps.
- the antimony, tellurium and selenium raw materials are crushed appropriately, and after the raw materials are sieved to adjust the particle size, the impurities concentrated as described above are effectively removed by washing with an acid. Next, after the impurities are removed by acid washing with an acid as described above, this raw material is dissolved and fabricated to obtain an ingot of high purity antimony, tellurium and selenium.
- the particle size of sieved antimony, tellurium and selenium raw materials is adjusted to 0.5 to 10 mm. If it is less than 0.5 mm, cleaning is difficult and the cleaning efficiency can not be improved. Moreover, if it exceeds 10 mm, impurities remain in the raw material powder and there is a problem that sufficient cleaning can not be performed. Therefore, the particle size of antimony, tellurium and selenium raw material is adjusted to 0.5 mm to L 0 mm by a sieve. A more preferable range is 1 mm to 5 mm.
- hydrochloric acid is effective as a washing acid.
- the acid concentration should be between 0.5N and 6N. If it is less than 0.5 N, acid cleaning takes too long, and if it exceeds 6 N, some dissolution of antimony, tellurium and selenium will occur, resulting in loss. Therefore, the acid concentration should be 0.5 N to 6 N. It is desirable to
- acid cleaning is performed at a temperature of 10 ° (: ⁇ 80 ° C.) If the temperature is less than 10 ° C., impurities are not effectively removed, and if it exceeds 80 ° C., the solution is largely evaporated and acid loss is caused. Unfavorably because it becomes large.
- the purity after high purification can be 4 N to 5 N level or more.
- the antimony, tellurium and selenium raw material powders are washed with pure water, dried, dissolved in an inert atmosphere such as argon gas or in vacuum, and fabricated to obtain high purity antimony or tellurium ingot.
- antimonium, tellurium and selenium of 4N level or more by the simple method of acid cleaning and dissolution.
- the antimony, tellurium or selenium thus produced is mixed with one or more selected from transition metals, gallium, germanium, indium and tin as auxiliary components in a target mixing ratio and dissolved.
- the purity of the raw material before dissolution is preferably 99.999 wt% or more.
- composition deviations are significantly reduced. Dissolution is usually performed at a temperature above the melting point of the component element or product compound. As described above, the target composition deviation should be reduced by purifying the raw material in advance and further reducing the amount of oxides and slag. Is possible. The amount of slag generated is small, and its removal will reduce the impact.
- the melted ingot was crushed in an Ar atmosphere by a pole mill, and the crushed material was hot pressed and further formed into a sputtering target.
- the total content of the impurities is less than 10 ppm and the content of impurities other than the component elements is less than 15 ppm, and the carbon component is less than 15 ppm.
- the nitrogen content was less than 200 ppm, the oxygen content was less than 100 ppm, and the sulfur content was less than 10 ppm.
- the average grain size was 30 m.
- composition of the sample collected from 5 parts of this target was analyzed. As shown in Table 2, the deviation of composition (average value of 5 parts) from the target component of germanium, antimony and tellurium is -0. Lat%,- The ratio was 0.2 at% and +0.3 at%, both of which satisfied the conditions of the present invention.
- a highly purified 5 N level bulk silver, indium, antimony, tellurium raw material is formulated to be 5 at% silver, 5 at% indium, 60 at% antimony, 30 at% tellurium, quartz crucible And sealed under vacuum and dissolved at 1100.degree. C. in an Ar atmosphere.
- the melted ingot was pulverized in an Ar atmosphere by an alumina ball mill, and the material after pulverization was hot-pressed and further shaped into a sputtering target.
- metal elements other than the component are 1 O p pm or less, the carbon component is 10 p pm, the nitrogen component is 3 OO ppm, the oxygen component is 300 p pm or less, and the sulfur component is 10 p pm or less Met.
- the average grain size was 30 m.
- composition analysis of samples collected from 5 points in this target as shown in Table 3, deviation of composition (average value of 5 points) for target components of silver, indium, antimony and tellurium is respectively —0. Lat%, +0.1. At%, +0.3. 3 at, —0.3 at%, all of which satisfied the conditions of the present invention.
- composition of the sample collected from 5 parts of this target was analyzed.
- the composition deviation (average value of 5 parts) for the target components of silver, germanium, antimony and tellurium is + 0.5 respectively.
- the present invention segregates and segregates near the interface between the memory point and the non-memory part, and reduces as much as possible the impurities in the target causing the decrease in the number of rewrites, especially carbon, nitrogen, oxygen, which have high diffusion and mobility. It has an excellent effect of being able to improve the rate of crystallization (crystallization) from the amorphous state by reducing the amount of impurities such as sulfur and other gas components and alkali metals and alkaline earth metals.
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Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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KR1020047013103A KR100656674B1 (ko) | 2002-02-25 | 2002-12-05 | 상변화형 메모리용 스퍼터링 타겟트 및 이 타겟트를사용하여 형성된 상변화 메모리용 막 및 상기 타겟트의제조방법 |
US10/504,739 US7156964B2 (en) | 2002-02-25 | 2002-12-05 | Sputtering target for phase-change memory, film for phase change memory formed by using the target, and method for producing the target |
EP02788727A EP1480209B1 (en) | 2002-02-25 | 2002-12-05 | Method for producing a sputtering target |
JP2003570343A JPWO2003071531A1 (ja) | 2002-02-25 | 2002-12-05 | 相変化型メモリー用スパッタリングターゲット及び該ターゲットを用いて形成された相変化メモリー用膜並びに前記ターゲットの製造方法 |
US11/533,945 US7484546B2 (en) | 2002-02-25 | 2006-09-21 | Sputtering target for phase-change memory, film for phase change memory formed by using the target, and method for producing the target |
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JP2002047370 | 2002-02-25 | ||
JP2002-47370 | 2002-02-25 |
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US10504739 A-371-Of-International | 2002-12-05 | ||
US11/533,945 Division US7484546B2 (en) | 2002-02-25 | 2006-09-21 | Sputtering target for phase-change memory, film for phase change memory formed by using the target, and method for producing the target |
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WO2003071531A1 true WO2003071531A1 (en) | 2003-08-28 |
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PCT/JP2002/012739 WO2003071531A1 (en) | 2002-02-25 | 2002-12-05 | Sputtering target for phase-change memory, film for phase change memory formed by using the target, and method for producing the target |
Country Status (7)
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US (2) | US7156964B2 (ja) |
EP (1) | EP1480209B1 (ja) |
JP (4) | JPWO2003071531A1 (ja) |
KR (1) | KR100656674B1 (ja) |
CN (2) | CN101042903B (ja) |
TW (1) | TW200303369A (ja) |
WO (1) | WO2003071531A1 (ja) |
Cited By (2)
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WO2006059429A1 (ja) * | 2004-11-30 | 2006-06-08 | Nippon Mining & Metals Co., Ltd. | Sb-Te系合金焼結体スパッタリングターゲット |
EP1840240A1 (en) * | 2005-01-18 | 2007-10-03 | Nippon Mining & Metals Co., Ltd. | Sb-Te BASED ALLOY POWDER FOR SINTERING AND SINTERED SPUTTERING TARGET PREPARED BY SINTERING SAID POWDER, AND METHOD FOR PREPARING Sb-Te BASED ALLOY POWDER FOR SINTERING |
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- 2002-12-05 US US10/504,739 patent/US7156964B2/en not_active Expired - Lifetime
- 2002-12-05 WO PCT/JP2002/012739 patent/WO2003071531A1/ja active Application Filing
- 2002-12-05 JP JP2003570343A patent/JPWO2003071531A1/ja active Pending
- 2002-12-05 EP EP02788727A patent/EP1480209B1/en not_active Expired - Lifetime
- 2002-12-05 CN CN200710086279XA patent/CN101042903B/zh not_active Expired - Lifetime
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- 2002-12-10 TW TW091135656A patent/TW200303369A/zh not_active IP Right Cessation
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006059429A1 (ja) * | 2004-11-30 | 2006-06-08 | Nippon Mining & Metals Co., Ltd. | Sb-Te系合金焼結体スパッタリングターゲット |
JPWO2006059429A1 (ja) * | 2004-11-30 | 2008-08-07 | 日鉱金属株式会社 | Sb−Te系合金焼結体スパッタリングターゲット |
US7803209B2 (en) | 2004-11-30 | 2010-09-28 | Nippon Mining & Metals Co., Ltd | Sb-Te alloy sintered compact sputtering target |
JP4708361B2 (ja) * | 2004-11-30 | 2011-06-22 | Jx日鉱日石金属株式会社 | Sb−Te系合金焼結体スパッタリングターゲット |
EP1840240A1 (en) * | 2005-01-18 | 2007-10-03 | Nippon Mining & Metals Co., Ltd. | Sb-Te BASED ALLOY POWDER FOR SINTERING AND SINTERED SPUTTERING TARGET PREPARED BY SINTERING SAID POWDER, AND METHOD FOR PREPARING Sb-Te BASED ALLOY POWDER FOR SINTERING |
EP1840240A4 (en) * | 2005-01-18 | 2008-07-09 | Nippon Mining Co | POWDER OF SB-TE BASED ALLOY FOR SINTERING AND SINTERED SPUTTER TARGET MANUFACTURED BY SINTERING THE POWDER, AND METHOD FOR PRODUCING THE POWDER OF SB-TE BASED ALLOY FOR SINTERING |
Also Published As
Publication number | Publication date |
---|---|
JP4790833B2 (ja) | 2011-10-12 |
EP1480209A4 (en) | 2006-11-08 |
EP1480209A1 (en) | 2004-11-24 |
JP5420594B2 (ja) | 2014-02-19 |
EP1480209B1 (en) | 2009-04-01 |
JP2010003402A (ja) | 2010-01-07 |
KR100656674B1 (ko) | 2006-12-11 |
CN1620693A (zh) | 2005-05-25 |
KR20040078700A (ko) | 2004-09-10 |
CN100369141C (zh) | 2008-02-13 |
JP5203420B2 (ja) | 2013-06-05 |
JP2012009128A (ja) | 2012-01-12 |
CN101042903A (zh) | 2007-09-26 |
US20070062808A1 (en) | 2007-03-22 |
US7484546B2 (en) | 2009-02-03 |
TWI303281B (ja) | 2008-11-21 |
JP2010236095A (ja) | 2010-10-21 |
US7156964B2 (en) | 2007-01-02 |
TW200303369A (en) | 2003-09-01 |
JPWO2003071531A1 (ja) | 2005-06-16 |
US20050115829A1 (en) | 2005-06-02 |
CN101042903B (zh) | 2010-06-09 |
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