WO2007083587A1 - Soiウエーハの製造方法およびsoiウエーハ - Google Patents
Soiウエーハの製造方法およびsoiウエーハ Download PDFInfo
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- WO2007083587A1 WO2007083587A1 PCT/JP2007/050391 JP2007050391W WO2007083587A1 WO 2007083587 A1 WO2007083587 A1 WO 2007083587A1 JP 2007050391 W JP2007050391 W JP 2007050391W WO 2007083587 A1 WO2007083587 A1 WO 2007083587A1
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- soi
- wafer
- layer
- thickness
- oxide film
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 63
- 238000000034 method Methods 0.000 claims abstract description 43
- 235000012431 wafers Nutrition 0.000 claims description 189
- 239000010408 film Substances 0.000 claims description 78
- 238000005468 ion implantation Methods 0.000 claims description 32
- 150000002500 ions Chemical class 0.000 claims description 15
- 239000007789 gas Substances 0.000 claims description 9
- -1 hydrogen ions Chemical class 0.000 claims description 9
- 239000001257 hydrogen Substances 0.000 claims description 7
- 229910052739 hydrogen Inorganic materials 0.000 claims description 7
- 239000010409 thin film Substances 0.000 claims description 6
- 238000003776 cleavage reaction Methods 0.000 claims description 4
- 230000007017 scission Effects 0.000 claims description 4
- 239000000758 substrate Substances 0.000 description 33
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 14
- 229910052710 silicon Inorganic materials 0.000 description 14
- 239000010703 silicon Substances 0.000 description 14
- 239000013078 crystal Substances 0.000 description 11
- 230000032798 delamination Effects 0.000 description 9
- 230000003647 oxidation Effects 0.000 description 9
- 238000007254 oxidation reaction Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- 238000002310 reflectometry Methods 0.000 description 9
- 230000003287 optical effect Effects 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- 238000005498 polishing Methods 0.000 description 7
- 238000000926 separation method Methods 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000000407 epitaxy Methods 0.000 description 6
- 239000004065 semiconductor Substances 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 238000002513 implantation Methods 0.000 description 5
- 230000035484 reaction time Effects 0.000 description 5
- 239000012808 vapor phase Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
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- 238000000227 grinding Methods 0.000 description 3
- 239000012495 reaction gas Substances 0.000 description 3
- 229910052814 silicon oxide Inorganic materials 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 238000007517 polishing process Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 241000652704 Balta Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000577 Silicon-germanium Inorganic materials 0.000 description 1
- 238000006836 Ueno reaction Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
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- 229910052786 argon Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000003486 chemical etching Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 229910052743 krypton Inorganic materials 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
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- 239000010453 quartz Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
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- 238000000927 vapour-phase epitaxy Methods 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
Classifications
-
- 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
- H01L21/20—Deposition of semiconductor materials on a substrate, e.g. epitaxial growth solid phase epitaxy
-
- 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
- H01L21/76—Making of isolation regions between components
- H01L21/762—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers
- H01L21/7624—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using semiconductor on insulator [SOI] technology
- H01L21/76251—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using semiconductor on insulator [SOI] technology using bonding techniques
- H01L21/76254—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using semiconductor on insulator [SOI] technology using bonding techniques with separation/delamination along an ion implanted layer, e.g. Smart-cut, Unibond
Definitions
- the present invention relates to a method for manufacturing an SOI wafer in which a semiconductor single crystal film is epitaxially grown on an SOI wafer serving as a substrate to increase the thickness of the SOI layer.
- a bonded substrate obtained by bonding a bond wafer and a base wafer and then bonding the bond wafer to a thin film is used.
- a silicon SOI substrate is known.
- an SOI substrate for example, the following bonding method is known.
- two mirror-polished silicon wafers (Bondueha and a Sweweno) are prepared, and an oxide film is formed on at least one wafer. And after bonding these wafers through an oxide film, the bonding strength is increased by heat treatment. Thereafter, a bond wafer is thinned to obtain an SOI substrate on which an SOI (Silicon on Insulator) layer is formed.
- a bond wafer is thinned to some extent by grinding or etching, and then the surface is further mechanochemically polished to finish the desired SOI layer thickness.
- the SOI wafer manufactured by this method has the advantage that the crystallinity of the SOI layer and the reliability of the oxide film are as high as that of a normal semiconductor wafer.
- the SOI layer has a uniform thickness.
- the in-plane uniformity is about ⁇ 0.3 / zm at most with respect to the target film thickness, and the force cannot be obtained.
- the SOI layer has a relatively thick film thickness of several tens of ⁇ m and a few tens of ⁇ m! SOW AHA is extremely useful for bipolar devices and power devices. Is also highly expected.
- the bond wafer and the base wafer are first bonded through an oxide film by the bonding method described above, and the temperature is about 1100 ° C.
- a bonded heat treatment is performed, followed by grinding and polishing to produce an SOI wafer having a desired film thickness.
- unbonded portions are generated in the periphery of the wafer.
- the ion implantation delamination method has a great merit in terms of productivity and cost because it does not require an edge processing step that is indispensable in the wafer bonding method.
- the acceleration voltage force of the ion implanter determines the implantation depth of S ions, which determines the thickness of the SOI layer. Therefore, in a large current ion implanter normally used as a mass production machine, Due to the above limitation, the acceleration voltage is limited to about 200 keV, so only the SOI layer with a film thickness of about 2 ⁇ m could be produced.
- an oxide film is formed on at least one of the bond wafer and the base wafer, and the main surface force of the bond wafer is implanted with hydrogen ions or rare gas ions to form an ion implantation layer.
- the surface into which the ions have been implanted is brought into close contact with the base wafer through an oxide film, and then heat treatment is applied to form a bond wafer with the ion implantation layer as a cleavage surface (peeling surface).
- An SOI wafer having a SOI layer having a SOI layer (an SOI wafer to be a substrate) separated into a shape and then growing an epitaxial layer on the SOI layer to form a relatively thick SOI layer Is disclosed in Japanese Patent No. 3358550.
- An object of the present invention is to provide a method for manufacturing a high-quality SOI wafer with less slip dislocation in the method for manufacturing an SOI wafer with a thicker layer.
- the present invention provides an SOI layer in which an epitaxial layer is grown on an SOI layer of an SOI wafer in which an oxide film and an SOI layer are formed on a base wafer to increase the thickness of the SOI layer.
- the reflectance of the surface in the wavelength range of the heating light at the start of the epitaxial growth of the SOI wafer for growing the epitaxial layer is 30% or less.
- An SOI wafer manufacturing method characterized by performing epitaxial growth so that the upper limit is 80% or less is provided.
- the epitaxial layer is grown on the SOI layer of the SOI wafer in which the oxide film and the SOI layer are formed on the base wafer to increase the thickness of the SOI layer. If the reflectivity of the heating lamp light at 30% or more and 80% or less at the surface of the SOI wafer, the heat lamp light energy will be absorbed efficiently on the surface of the SOI wafer, so the temperature distribution within the SOI wafer will be made more uniform. And the occurrence of slip dislocation can be suppressed. Therefore, a high-quality SOI wafer with few slip dislocations can be obtained efficiently, and productivity is improved.
- the reflectance of the surface of the SOI wafer on which the epitaxial layer is grown is adjusted to 30% or more by adjusting the thickness of the oxide film and the thickness of the SOI layer, respectively. Can be reduced to 80% or less.
- the reflectance at the surface of an SOI wafer having a thin SOI layer is greatly contributed by the formation of a one-dimensional photonic bandgap structure by an oxide film and an SOI layer. Therefore, the reflectance of the surface of the SOI wafer can be adjusted to 30% or more and 80% or less by adjusting the thickness of the SOI wafer and the thickness of the SOI layer of the SOI wafer on which the epitaxial layer is grown. it can.
- the SOI wafer for growing the epitaxial layer is implanted with hydrogen ions, rare gas ions, or mixed gas ions from the surface of the bond wafer to form an ion implantation layer inside the wafer. Then, the surface of the bond wafer on which ions are implanted and the surface of the base wafer are brought into close contact with each other through an oxide film, and then heat treatment is applied so that the bond wafer is formed into a thin film using the ion implantation layer as a cleavage plane It can be made separately.
- the effect of the present invention is particularly remarkable when an SOI wafer serving as a substrate on which an epitaxial layer is grown is produced using the above-described ion implantation delamination method.
- the SOI wafer which is the substrate fabricated by the ion implantation delamination method, has a maximum SOI layer of about 2 m and easily meets the conditions for strong reflection on the surface.
- SOI wafers which are substrates fabricated by ion implantation delamination, have high uniformity of SOI layer thickness. When epitaxial growth is performed on such an SOI layer, a thick SOI wafer having a uniform SOI layer thickness can be manufactured.
- An SOI wafer manufactured by the SOI wafer manufacturing method as described above is a high-quality SOI wafer having a thick film SOI layer with a small film thickness uniformity with little slip dislocation. .
- the SOI layer is thickened. If epitaxial growth is performed so that the reflectance of the surface in the wavelength range of the heating light at the start of the epitaxial growth of the SOI wafer where the epitaxial layer is grown is 30% or more and 80% or less, the temperature within the wafer is increased. The distribution can be made more uniform, and as a result, the occurrence of slip dislocation can be suppressed. Therefore, high-quality thick film SOI wafers with few slip dislocations can be manufactured efficiently.
- FIG. 1 is an explanatory diagram showing a manufacturing process of a so I wafer in which an epitaxial layer is grown on an SOI layer of the SOI wafer to increase the thickness of the SOI layer.
- FIG. 2 is a schematic configuration diagram of a single-wafer vapor phase epitaxy growth apparatus that can be used in the present invention.
- FIG. 3 is a diagram schematically showing light reflection on the SOI layer side by forming a photonic band gap structure.
- FIG. 4 is a graph showing the result of measuring the reflectance of SOI wafer.
- FIG. 5 is a graph showing the relationship between the reflectance of SOI wafer before epitaxy growth and the total slip length after epitaxy growth.
- the inventor has studied the problem that slip dislocations and the like are likely to occur when an epitaxial layer is grown on the SOI layer of the SOI wafer serving as the substrate.
- the inventor of the present invention has described a one-dimensional photonic band described later when an oxide film and an SOI layer having different refractive indexes satisfy a specific layer thickness relationship at the start of epitaxial growth.
- gap We paid attention to the fact that the reflectivity for the irradiated heating light spectrum is extremely large when the structure is formed.
- heating of the SOI wafer by heating light irradiation causes non-uniformity, leading to the occurrence of slip dislocations and the like. Thought.
- the present inventor properly adjusts the layer thickness relationship when the laminated portion of the oxide film and the SOI layer forms a one-dimensional photonic bandgap structure in a specific wavelength region and strong reflection occurs. It has been found that this reflection can be greatly suppressed.
- the heating light used in the epitaxial growth has a intensity peak whose wavelength is normally in the vicinity of 1.0 m, and the oxide film and the SOI layer.
- the thickness of the oxide film and the SOI layer is adjusted so that the reflectivity power for the light in the wavelength region indicated by the laminated portion is small. Specifically, the reflectance at the surface in the wavelength region is adjusted.
- the thickness tl and the thickness t2 of the SOI layer of the SOI wafer as the substrate before the epitaxial growth are adjusted so that the thickness is 80% or less, more preferably 70% or less.
- the wavelength component that contributes to the heating of the light source is efficiently absorbed by the SOI wafer, and it is possible to extremely effectively suppress the occurrence of slip dislocation associated with the heating when growing the epitaxial layer. I found it.
- the present inventor has grasped the following fact as a result of examining in detail the relationship between the conditions for epitaxial growth on the SOI layer of the SOI wafer as the substrate and the occurrence of slip dislocation on the wafer. It came to.
- slip dislocation may occur easily. Specifically, the SOI wafer is heated by light irradiation from the SOI layer side.
- Light reflection on the SOI layer surface is a force that can be considered as total reflection due to the difference in refractive index between the ambient atmosphere (eg air) and the SOI layer. This is because the incident angle of light exceeds a certain critical angle. This only occurs in large cases, and it is not so much a problem if the entire surface of the SOI wafer can be irradiated uniformly with a wide light source in the plane. However, when an oxide film and an SOI layer having different refractive indexes are combined, the incident direction of light is close to the surface normal direction depending on the relationship between the layer thickness and the wavelength of incident light. Even so, very strong reflections may occur.
- a layer thickness direction of a laminate in which the refractive index changes periodically such as a structure in which a silicon oxide film and a silicon layer are alternately laminated
- the photoquantized electromagnetic wave energy is counteracted.
- a band structure similar to the electron energy in the crystal is formed, and electromagnetic waves having a specific wavelength corresponding to the period of refractive index change are prevented from entering the laminated structure.
- Such a structure is called a photonic band structure, and in the case of a multilayer film, the refractive index change is formed only in the layer thickness direction, so it is also called a one-dimensional photonic band gap structure in a narrow sense.
- the photonic band gap region In such a photonic band gap structure, the greater the number of lamination periods, the wider the wavelength range in which incidence is prohibited (that is, the wavelength range where the reflectance increases; hereinafter referred to as the photonic band gap region). Trending force Even if the number of stacking periods is 1, the photonic band gap area is only relatively narrow, and very large reflections are generated near the gap center wavelength.
- the wavelength of the incident light is 1 2 (that is, 0.5 ⁇ ).
- the ratio of the optical thickness of the oxide film to the SOI layer (tl X nl) Z (t2 X n2) is close to 1 (that is, the optical thickness of both layers is equal to each other) Wavelength at which strong reflection occurs
- the area is the widest and the reflectivity is high.
- the refractive index nl in the infrared wavelength region of the oxide film is 1.5 for the silicon oxide film
- the refractive index n2 of the SOI layer is 3.5 for the silicon single crystal
- Ge germanium
- the thicknesses of the oxide film and the SOI layer are set so that the center wavelength of the photonic band gap formed by the stacked portion of the oxide film and the SOI layer is as far as possible from the peak wavelength of the incident light.
- the reflectance can be reduced to 80% or less.
- the refractive index in the region 2 is nl
- the refractive index in the wavelength region of the semiconductor forming the SOI layer is n2
- the optical thickness tOP in the wavelength region between these oxide films and the SOI layer is 0.5 ⁇ force as much as possible.
- the reflectance can be made 30% to 80% by adjusting the thickness tl of the oxide film and the thickness t2 of the SOI layer so as to be separated from each other. As a result, it becomes possible to heat the SOI wafer more uniformly by light irradiation from the SOI layer side, and it is possible to more effectively prevent slip dislocations and the like generated in the SOI wafer during the epitaxial growth.
- the effect of the present invention described above is the heating power during the epitaxial growth.
- the temperature of the base wafer is usually measured by a temperature sensor (for example, a radiation thermometer) disposed on the second main surface side (back side) of the base wafer.
- Heating is performed by controlling the heat generation output of the calo heat light source so that the temperature of the base wafer is kept at the set heating temperature.
- the SOI layer forms a photonic band gap structure together with the oxide film, the following situation is brought about.
- the output of the heating light source is controlled in the increasing direction and the temperature rise starts.
- the control unit of the light source increases the output of the heating light in an attempt to bring the detected temperature closer to the target value.
- the output of the heating light source shifts to the over side compared to the case where there is not much reflection (for example, when the SOI layer is not formed and the epitaxial growth is performed on a mirror polished wafer). It will be controlled in the state.
- heat transfer from the SOI layer surface force to the base wafer side is not limited to radiant heat transfer by direct incidence of heating light. And if the output of the heating light source is shifted to the over side, the temperature of the ambient atmosphere that is not affected by the reflection will rise abnormally, and the temperature on the SOI layer side that contacts this will rise excessively, causing the base wafer to The temperature difference between the front and back is also very large. As a result, s
- the non-uniform temperature of OI wafer is more likely to expand.
- by suppressing the formation of photonic band gap in the stack of oxide film and SOI layer, and making the reflectivity on the surface 30% or more and 80% or less as in the present invention single-side heating type epitaxial growth is achieved. Even when equipment is used, the occurrence of slip dislocations on SOI wafers can be effectively prevented.
- This effect is particularly effective when the heating set temperature is high, for example, 1000 ° C or higher and 1300 ° C or lower, and the rate of temperature rise to the set temperature is high, for example, 50 ° CZ second or higher and 100 ° CZ second or lower. It is remarkable.
- the rate of temperature rise is set to a large value, the output of the heating light source is increased before the heat conduction in the wafer thickness direction proceeds sufficiently, and the second main surface of the base wafer on which the temperature is measured.
- the temperature rise above is more than the temperature on the SOI layer side. It will be late. As a result, the output of the heating light source is likely to become excessively strong, and the temperature is likely to be uneven.
- Fig. 1 is an explanatory diagram showing a method of manufacturing an SOI wafer in which an epitaxial layer is grown on the SOI layer of the SOI wafer as a substrate to increase the thickness of the SOI layer.
- the SOI wafer as a substrate on which the epitaxial layer is grown is shown in FIG. This shows how to fabricate two silicon wafers by bonding them together, and then thinning the SOI layer by ion implantation delamination.
- the process for producing the SOI wafer to be the substrate on which the epitaxial layer is grown is based on the ion implantation separation method, but it is not limited to the ion implantation separation method, and any method may be used.
- a method of performing heat treatment after implanting oxygen ions into a silicon wafer may be used, or as a bond wafer, a semiconductor single crystal such as Si, SiGe, or Ge is epitaxially grown on a silicon single crystal wafer.
- step (a) two silicon mirror wafers are prepared, and a base wafer 14 serving as a support substrate and a bond wafer 11 serving as an SOI layer are prepared in accordance with device specifications.
- step (b) at least one of the uenos, here, Bondueha 11 is subjected to, for example, thermal oxidation, and the surface thereof has, for example, an oxide film having a thickness of not less than lOnm and not more than 500 nm.
- This oxide film can be formed by a method such as CVD.
- the film thickness of the oxide film 12 is the oxidation treatment temperature and time, and the atmosphere used for the oxidation treatment. It can be precisely adjusted by the oxygen concentration.
- increasing the oxidation treatment temperature, increasing the oxidation treatment time, and increasing the oxygen concentration in the atmosphere used for the oxidation treatment contribute to increasing the thickness of the oxide film 12.
- the film thickness of this oxide film 12 remains as it is, and the SOI wafer oxide film (the substrate to be fabricated in the subsequent step (f) ( (Embedded oxide film) 17 film thickness tl.
- step (c) at least one kind selected from ion group forces consisting of hydrogen ions or rare gas (He, Ne, Ar, Kr, Xe) ions on one side of Bondueha 11, here, Hydrogen ions are implanted to form an ion implantation layer 13 parallel to the surface at an average ion penetration depth.
- ion group forces consisting of hydrogen ions or rare gas (He, Ne, Ar, Kr, Xe) ions on one side of Bondueha 11, here, Hydrogen ions are implanted to form an ion implantation layer 13 parallel to the surface at an average ion penetration depth.
- the depth of the ion-implanted layer 13 can be set to a value of, for example, 20 nm or more and 2000 nm or less, and can be precisely adjusted by ion implantation energy or the like. In this case, increasing the ion implantation energy contributes to increasing the depth of the ion implantation layer 13.
- the depth of the ion implantation layer 13 is directly involved in determining the thickness of the SOI layer 18 of the SOI wafer that will be the substrate fabricated in the subsequent step (f). It is almost equal to the sum of the thickness of 17 and the thickness of the SOI layer 18 immediately after peeling.
- step (d) is a step in which the hydrogen ion implantation surface of the bond wafer 11 into which hydrogen ions have been implanted is brought into close contact with the base wafer 14 via an oxide film.
- step (1) is a separation heat treatment step in which separation is performed using the ion implantation layer 13 as a boundary to separate the separation wafer 15 and the SOI wafer 16.
- the separation wafer 15 and the SOI wafer 16 are separated by rearrangement of crystals and aggregation of bubbles.
- the ion implantation layer for peeling 13 is formed, the amount of ion implantation is increased, or the surface to be overlapped is preliminarily subjected to plasma treatment to activate the surface, so that the peeling heat treatment can be omitted.
- the peeling wafer 15 can be reused again as a bond wafer or a base wafer after polishing the peeling surface.
- a bonding heat treatment step is performed in step (f).
- the bonding strength between the wafers adhered in the adhesion process and the peeling heat treatment process in steps (d) and (e) above is weak to use in the device process as it is.
- This heat treatment is, for example, 1000 to 1200 under an inert gas atmosphere. A 30-minute force at C is performed for 2 hours.
- the peeling heat treatment is performed at a high temperature of, for example, 800 ° C or more, so that the bonding heat treatment is also performed, and the bonding heat treatment performed alone may be omitted.
- an SOI wafer 19 that includes the oxide film 17 and the SOI layer 18 and serves as a substrate for performing epitaxial growth on the SOI layer 18 can be manufactured.
- step (g) is a step of manufacturing an SOI wafer having an SOI layer having a desired thickness by performing epitaxial growth on the SOI layer of the SOI wafer as a substrate.
- This epitaxial growth is performed using, for example, a single wafer type vapor phase epitaxial growth apparatus as shown in FIG.
- This epitaxial growth apparatus 30 is an apparatus for performing, for example, a process involving heating one by one for vapor phase epitaxial growth on a main surface of a substrate such as a silicon single crystal wafer (wafer W).
- the epitaxy growth apparatus 30 mainly heats the epitaxy growth vessel 31, the susceptor 32 on which the wafer W is placed, the support means 33 that supports the susceptor 32, the temperature measurement means 34, the ueno, and W. It is configured to include a heating device 35 or the like.
- the epitaxial growth vessel 31 is used for epitaxial growth with the wafer W disposed therein, and the top wall 3 la and the bottom wall 3 lb are made of translucent quartz.
- a gas supply port 31c for supplying a reaction gas into the epitaxial growth vessel 31 and a gas discharge port 31d for discharging the reaction gas from the epitaxial growth vessel 31 are formed on the side wall of the heat treatment vessel 31. Is formed.
- the susceptor 32 is provided inside the epitaxial growth vessel 31, and is formed by coating graphite with carbon dioxide. On the upper surface of the susceptor 32, a substantially circular counterbore 32a for mounting the wafer W is formed.
- the support means 33 includes a rotary shaft 33a extending vertically below the susceptor 32 (a rotary drive means (not shown) is coupled to the rotary shaft 33a), and an angle from the upper end of the rotary shaft 33a.
- the spokes 33b which diverge radially upward and have tips that support the lower surface of the susceptor 32, are formed.
- a concave portion (not shown) is formed at a location where it comes into contact with the tip of the spoke 33b of the support means 33.
- the susceptor 32 is fixed on the support means 33 by inserting the tip of the spoke 33b into the recess.
- heating for epitaxial growth is rapid heating in which the rate of temperature increase to the epitaxial growth temperature is set to 50 ° CZ seconds or more and 100 ° CZ seconds or less, for example, 75 ° CZ seconds. Done.
- the SOI wafer is arranged on the upper side so that the SOI layer faces the heating lamp 35.
- the heating light emitted from the heating lamp 35 is, for example, near infrared light having a peak wavelength of, for example, 10 OOnm.
- the reaction temperature for the epitaxial growth is, for example, 900 ° C. or more and 1200 ° C. or less in the case of silicon.
- the reaction time for epitaxy growth is, for example, 30 seconds or more and 30 minutes or less. The reaction time may be long, but in this case, productivity is lowered.
- the thickness of the epitaxial layer can be adjusted by the flow rate of the reaction gas, the reaction temperature, and the reaction time.
- the epitaxial layer 20 after the epitaxial growth forms an SOI layer of the SOI wafer 21 after the epitaxial growth together with the SOI layer 18 before the epitaxial growth.
- the thickness tl of the oxide film 17 is determined in the step (b).
- the thickness t2 of the SOI layer 18 immediately after delamination because the delamination is performed in the step (e) at the ion implantation depth determined by the ion implantation energy at the time of ion implantation in the step (c) Is determined during step (c). That is, the thickness tl of the oxide film 17 and the thickness t2 of the SOI layer 18 can be adjusted by appropriately adjusting the conditions in the steps (b) and (c).
- the force describing the method of adjusting the thickness tl of the oxide film 17 and the thickness t2 of the SOI layer 18 when an SOI wafer to be a substrate is manufactured by the ion implantation delamination method is used.
- the thickness tl of the oxide film and the thickness t2 of the SOI layer can be adjusted by an appropriate method.
- the thickness tl of the oxide film and the thickness t2 of the SOI layer can be adjusted, for example, by adjusting the implantation energy when oxygen ions are implanted.
- the photonic band guide Based on the Yap theory, the wavelength dependence of the reflectance of the laminated part can be simulated by calculation.
- the stacked portion of the oxide film 17 and the SOI layer 18 does not form a one-dimensional photonic band gap structure, that is, the total optical thickness of both layers tOP Force Photonic band gap formation condition 0.5 ⁇ force
- the feature is that the layer thickness tl of the silicon oxide film 17 and the layer thickness t2 of the SOI layer 18 are adjusted so as to be separated as much as possible.
- the ability to have a predetermined reflectivity at the start of epitaxial growth is affected by the fact that the in-plane temperature at the start of growth is uneven and the epitaxial layer is unevenly distributed. It is considered that this is because the uniformity is not corrected in the subsequent growth process.
- the two Bonduehas were heat-treated in an oxidizing atmosphere to form an oxide film on the entire wafer surface.
- the heat treatment time was adjusted so that the thickness of the oxide film was 145 nm.
- Hydrogen ion implantation was performed on two bonduehas under the conditions that the dose was 10 ⁇ 10 16 / cm 2 and the implantation energy was adjusted to 195 nm and 215 nm by adjusting the implantation energy.
- SOI wafer oxide film thickness tl and SOI layer thickness t2 combination t2Ztl The combinations were 50 nm Zl45 nm and 70 nm Zl45 nm, respectively.
- the reaction time was 0 ° C and 30 seconds.
- the thickness of the epitaxial layer was lOOOnm, and the total thickness of the SOI layer and the thickness of the oxide film after the epitaxial growth were 1050 nmZl45 nm and 1070 nmZl45 nm, respectively.
- the total slip length of the SOI wafer subjected to epitaxial growth in this way was measured to be 5 mm and 30 mm, respectively.
- Example 2 the thickness of the oxide film and the thickness of the SOI layer are adjusted to obtain a substrate having a surface reflectance of 30% to 95%, respectively. 7 sheets were prepared.
- An SOI wafer was produced by growing an epitaxial layer on the SOI wafer SOI to be used as a substrate under the conditions of a reaction temperature of 1050 ° C and a reaction time of 30 seconds.
- FIG. 5 shows the relationship between the total slip length measured after the epitaxial growth and the reflectance of the SOI wafer before the epitaxial growth.
- the total slip length may exceed the allowable value of 100mm.
- the total slip length is below the allowable value.
- the reflectance is 70% or less, it is almost 0.
- the reflectance was 60% or less, all were 0.
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Abstract
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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EP07713606.7A EP1978543B1 (en) | 2006-01-23 | 2007-01-15 | Soi wafer manufacturing method |
CN2007800029243A CN101371334B (zh) | 2006-01-23 | 2007-01-15 | Soi晶片的制造方法及soi晶片 |
KR1020087018175A KR101355428B1 (ko) | 2006-01-23 | 2007-01-15 | Soi 웨이퍼의 제조방법 및 soi 웨이퍼 |
US12/223,026 US7892948B2 (en) | 2006-01-23 | 2007-01-15 | Method for manufacturing SOI wafer and SOI wafer |
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JP2006013558A JP5168788B2 (ja) | 2006-01-23 | 2006-01-23 | Soiウエーハの製造方法 |
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EP (1) | EP1978543B1 (ja) |
JP (1) | JP5168788B2 (ja) |
KR (1) | KR101355428B1 (ja) |
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WO2010023816A1 (ja) * | 2008-08-28 | 2010-03-04 | 信越半導体株式会社 | Soiウェーハの製造方法およびsoiウェーハ |
CN101970341A (zh) * | 2008-02-18 | 2011-02-09 | 福吉米株式会社 | 微细构造的制作方法以及具备微细构造的基板 |
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JP2008016534A (ja) * | 2006-07-04 | 2008-01-24 | Sumco Corp | 貼り合わせウェーハの製造方法 |
JP5459900B2 (ja) * | 2007-12-25 | 2014-04-02 | 株式会社半導体エネルギー研究所 | 半導体装置の作製方法 |
US8698106B2 (en) * | 2008-04-28 | 2014-04-15 | Varian Semiconductor Equipment Associates, Inc. | Apparatus for detecting film delamination and a method thereof |
JP2010062452A (ja) * | 2008-09-05 | 2010-03-18 | Sumco Corp | 半導体基板の製造方法 |
US8956951B2 (en) * | 2009-09-04 | 2015-02-17 | Shin-Etsu Handotai Co., Ltd. | Method for manufacturing SOI wafer |
JP5604907B2 (ja) * | 2010-02-25 | 2014-10-15 | 信越半導体株式会社 | 気相成長用半導体基板支持サセプタおよびエピタキシャルウェーハ製造装置およびエピタキシャルウェーハの製造方法 |
US8822306B2 (en) * | 2010-09-30 | 2014-09-02 | Infineon Technologies Ag | Method for manufacturing a composite wafer having a graphite core, and composite wafer having a graphite core |
JP6210043B2 (ja) * | 2014-09-26 | 2017-10-11 | 信越半導体株式会社 | 貼り合わせウェーハの製造方法 |
FR3064398B1 (fr) * | 2017-03-21 | 2019-06-07 | Soitec | Structure de type semi-conducteur sur isolant, notamment pour un capteur d'image de type face avant, et procede de fabrication d'une telle structure |
CN107265399A (zh) * | 2017-07-03 | 2017-10-20 | 上海先进半导体制造股份有限公司 | 硅片密封腔体的制作方法 |
WO2021040677A1 (en) * | 2019-08-23 | 2021-03-04 | Hewlett-Packard Development Company, L.P. | Epitaxial-silicon wafer with a buried oxide layer |
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JP2007194539A (ja) | 2007-08-02 |
CN101371334A (zh) | 2009-02-18 |
US7892948B2 (en) | 2011-02-22 |
KR20080102362A (ko) | 2008-11-25 |
EP1978543B1 (en) | 2017-09-27 |
EP1978543A4 (en) | 2010-09-22 |
KR101355428B1 (ko) | 2014-01-27 |
JP5168788B2 (ja) | 2013-03-27 |
EP1978543A1 (en) | 2008-10-08 |
US20090042364A1 (en) | 2009-02-12 |
CN101371334B (zh) | 2012-05-16 |
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