WO2012074009A1 - 複合基板および製造方法 - Google Patents
複合基板および製造方法 Download PDFInfo
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- WO2012074009A1 WO2012074009A1 PCT/JP2011/077677 JP2011077677W WO2012074009A1 WO 2012074009 A1 WO2012074009 A1 WO 2012074009A1 JP 2011077677 W JP2011077677 W JP 2011077677W WO 2012074009 A1 WO2012074009 A1 WO 2012074009A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/30—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by physical imperfections; having polished or roughened surface
- H01L29/32—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by physical imperfections; having polished or roughened surface the imperfections being within the semiconductor body
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
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- 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
- H01L21/185—Joining of semiconductor bodies for junction formation
- H01L21/187—Joining of semiconductor bodies for junction formation by direct bonding
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- 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
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- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
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Definitions
- the present invention relates to a composite substrate having a silicon layer and a method for manufacturing the same.
- the method for manufacturing a composite substrate includes a step of preparing a first substrate formed of first silicon having a dopant, and a semiconductor layer formed by epitaxially growing second silicon on a main surface of the first substrate.
- the etchant uses a material whose etching rate with respect to silicon is lower than a predetermined value at a threshold dopant concentration that is lower than the dopant concentration of the first substrate.
- the semiconductor layer is in contact with the first substrate, and as the distance from the first substrate increases, the dopant concentration becomes the threshold value. In forming the first region to be reduced so as to have the thickness direction.
- a composite substrate according to an embodiment of the present invention includes an insulating substrate and a semiconductor layer having one main surface bonded to the upper surface of the substrate, and the dopant concentration of the semiconductor layer is from the other main surface to the substrate side. It gets lower as it gets closer.
- a composite substrate according to another embodiment of the present invention includes an insulating substrate and a semiconductor layer having one main surface bonded to the upper surface of the substrate, and the dopant concentration of the semiconductor layer is from the middle in the thickness direction. The height increases as approaching the other main surface side and the substrate side.
- a composite substrate having a silicon layer with few lattice defects can be provided.
- FIG. (A)-(c) is sectional drawing which shows the manufacturing process of the manufacturing method of the composite substrate which concerns on one Embodiment of this invention.
- FIG. (A)-(c) is sectional drawing which shows the manufacturing process after FIG. (A) is a top view which shows schematic structure of the composite substrate which concerns on one Embodiment of this invention, (b) is the fragmentary sectional view which looked at the composite substrate.
- FIG. (c) is sectional drawing which shows the manufacturing process of the manufacturing method of the composite substrate which concerns on other embodiment of this invention.
- FIG. (A) is a top view which shows schematic structure of the composite substrate which concerns on other embodiment of this invention
- FIG. (b) is the fragmentary sectional view which looked at the composite substrate.
- a first substrate 10 made of first silicon (Si) having a dopant is prepared.
- first silicon of the first substrate 10 p-type or n-type silicon can be adopted.
- dopant concentration of the first substrate 10 relatively high concentrations of p ++ and n ++ , and medium concentrations of p + and n + can be employed.
- the p ++ dopant concentration include a range of 1 ⁇ 10 18 to 1 ⁇ 10 21 [atoms / cm 3 ].
- Examples of the p + dopant concentration include a range of 1 ⁇ 10 16 or more and less than 1 ⁇ 10 18 [atoms / cm 3 ].
- n ++ dopant concentration examples include a range of 5 ⁇ 10 17 to 1 ⁇ 10 21 [atoms / cm 3 ].
- n + dopant concentration examples include a range of 5 ⁇ 10 15 or more and less than 5 ⁇ 10 17 [atoms / cm 3 ].
- a p-type substrate having a dopant concentration of p ++ is employed as the first substrate. Note that “++” and “+” written in the upper right of “p” and “n” are based on the resistance value of silicon.
- the second silicon is epitaxially grown on the upper surface of the first substrate 10 on the arrow D1 direction side, and the semiconductor layer 20 is formed as shown in FIG.
- a thermal chemical vapor deposition method in which a gaseous silicon compound is passed through the surface of the first substrate 10 while being thermally decomposed while growing the first substrate 10 (thermal CVD method).
- thermal CVD method thermal chemical vapor deposition method
- Various methods such as these can be adopted. Since the semiconductor layer 20 is epitaxially grown on the silicon substrate, lattice defects can be reduced as compared with the case where the semiconductor layer 20 is epitaxially grown on the sapphire substrate.
- a p-type or n-type silicon having less dopant than the first substrate 10 can be adopted.
- the semiconductor layer 20 is formed so that the dopant concentration gradually decreases from the first substrate 10 side toward the upper surface side.
- the main surface of the semiconductor layer 20 on the side not in contact with the first substrate 10 is formed so as to have a relatively low concentration of p ⁇ and n ⁇ dopant concentrations and non-doped.
- the p ⁇ dopant concentration include a range of less than 1 ⁇ 10 16 [atoms / cm 3 ].
- Examples of the n ⁇ dopant concentration include a range of less than 5 ⁇ 10 15 [atoms / cm 3 ].
- non-doped silicon is silicon that is simply not doped with the intention of impurities, and is not limited to intrinsic silicon that does not contain impurities.
- the semiconductor layer 20 of the present embodiment employs p-type silicon and is formed so that the dopant concentration of the upper surface portion is p ⁇ . Note that the description of “ ⁇ ” in the upper right of “p” and “n” is based on the resistance value of silicon.
- the dopant concentration of the semiconductor layer 20 can be controlled by adjusting the supply amount of impurities during epitaxial growth. By making this impurity supply zero, non-doped silicon can be formed. Further, the dopant concentration may be gradually changed by reducing the diffusion of the dopant generated during the epitaxial growth.
- the semiconductor layer 20 has a dopant concentration distribution in the thickness direction.
- the semiconductor layer 20 is formed so as to have at least the first region 20x in contact with the first substrate 10 in the thickness direction.
- the first region 20x is formed such that the dopant concentration decreases to a threshold value described later as the distance from the first substrate 10 increases. In the present embodiment, as the distance from the first region 20x increases, the dopant concentration continues to decrease from the threshold value.
- the semiconductor layer 20 may not be epitaxially grown until the dopant diffusion concentration is saturated.
- the formed epitaxial layer is composed of only a transition region in which the dopant concentration gradually changes from the first substrate 10 side. For example, by keeping the dopant concentration of the epitaxial layer slightly beyond the boundary dopant concentration (threshold described later) at which the etching rate of the etching solution changes greatly, the thickness of the epitaxial layer is etched, Can be thinner.
- an insulating second substrate 30 is prepared.
- a material for forming the second substrate 30 aluminum oxide single crystal (sapphire), silicon carbide, or the like can be used.
- sapphire is employed as the second substrate 30.
- the second substrate 30 and the main surface of the first semiconductor layer 20 on the first direction side are bonded together.
- the bonding method include a method of activating and bonding the surfaces of the surfaces to be bonded, and a method of bonding using electrostatic force.
- the method for activating the surface include a method of activating by irradiating an ion beam in vacuum and etching the surface, a method of activating by etching the surface with a chemical solution, and the like. You may perform this joining under normal temperature.
- a method that does not use a resin-based adhesive or the like is adopted, and the semiconductor layer 20 and the second substrate 30 are directly connected to each other by solid phase bonding (Solid-State Bonding) using atomic force or the like.
- Solid-State Bonding Solid-State Bonding
- a hybrid layer may be formed between the semiconductor layer 20 and the second substrate 30.
- substrate 30 have the small surface roughness of the surface to join.
- This surface roughness is represented by arithmetic mean roughness Ra, for example.
- the range of the surface roughness Ra is less than 10 nm.
- an intermediate product having the semiconductor layer 20 between the first substrate 10 and the second substrate 30 can be obtained.
- the intermediate product is processed from the arrow D2 direction side to reduce the thickness of the first substrate 10 as shown in FIG.
- various methods such as abrasive polishing, chemical etching, and ion beam etching can be employed, and a plurality of methods may be combined.
- the first substrate having a reduced thickness is referred to as a first thin substrate 11.
- etching is performed with an etching solution to reduce the thickness of the semiconductor layer 20 as shown in FIG.
- This etching can be performed by using a selective etchant (etching solution) whose etching rate varies greatly depending on the dopant concentration.
- etching solution include a mixed solution of hydrofluoric acid, nitric acid and acetic acid, and a mixed solution of hydrofluoric acid, nitric acid and water.
- a mixed liquid of hydrofluoric acid, nitric acid and acetic acid is employed as the etching liquid.
- the etchant is adjusted so that the etching rate with respect to silicon is lowered by a certain value or more at a threshold dopant concentration that is lower than the dopant concentration of the first substrate 10.
- the etching rate decreases by a certain value or more means that when a graph showing the relationship between the etching rate and the dopant concentration is created, the etching rate becomes 1 / This refers to the case where the value drops by 10 or more.
- this etching solution has an etching rate with a threshold dopant concentration of 7 ⁇ 10 17 to 2 ⁇ 10 18 [atoms / cm 3 ] as a boundary. It is adjusted so that it may drop significantly.
- the etching rate is set to change to 1/1000 or more with the threshold as a boundary.
- Other methods for selective etching include an electric field etching method in a hydrogen fluoride solution of about 5% or a pulse electrode anodizing method in a KOH solution.
- the semiconductor layer 20 the first region 20x is etched.
- the semiconductor layer whose thickness is reduced by etching is referred to as a functional layer 21. Examples of the thickness of the functional layer 21 include a range of about several hundred nm to 2 ⁇ m. If the first substrate 10 or the first thin substrate 11 remains, the remaining first substrate 10 or the first thin substrate 11 is also etched.
- the composite substrate 40 in which the semiconductor layer 21 is laminated on the upper surface of the insulating substrate 30 on the arrow D2 direction side as shown in FIG. 3 can be manufactured.
- one main surface of the semiconductor layer 21 is bonded to the upper surface of the substrate 30 on the arrow D2 direction side.
- the dopant concentration of the semiconductor layer 21 is lower on the bonding side (one main surface side, the substrate 30 side) than on the other main surface side. Further, when the dopant concentration is considered as the magnitude of the electric resistance, the electric resistance of the semiconductor layer 21 becomes closer from the surface side (the other main surface side) to the bonding side (the one main surface side, the substrate 30 side). It is getting smaller.
- an insulating substrate 30 refers to the second substrate 30 that has undergone the above-described manufacturing method
- a semiconductor layer 21 refers to a functional layer 21 in which the semiconductor layer 20 has been thinned through the above-described manufacturing method. Is.
- a gradient of the dopant concentration of the semiconductor layer 20 to be the functional layer 21 is formed on the surface to be bonded to the second substrate 30 before bonding to the second substrate 30.
- the gradient before bonding it is possible to reduce variations in the thickness of the functional layer 21 formed on the upper surface of the second substrate 30 as compared with the case where the gradient is formed after bonding. This is because if a gradient is formed after bonding, processing is performed from the first substrate 10 side, so that it is affected by variations in the thickness of the first substrate 10 or by warping of the second substrate 30. .
- This is particularly effective when a functional layer having a thickness smaller than at least one of the thickness variation of the first substrate 10 and the warpage of the second substrate 30 is formed.
- a silicon wafer is generally said to have a thickness variation of ⁇ 10 [ ⁇ m]. This thickness variation is much larger than the submicron value of several tens to several hundreds of nanometers, which is the thickness required for silicon of the SOS substrate.
- the semiconductor layer 20 has the lowest dopant concentration and the highest electrical resistance on the second substrate 30 side. With such a configuration, it is possible to realize excellent characteristics with less parasitic capacitance and noise when the semiconductor element functional unit is formed in the functional layer 21 of the composite substrate 40.
- the composite substrate 40 may be precisely polished. By this precise polishing, the thickness uniformity of the functional layer 21 can be improved.
- the etching means used for this precise etching include dry etching. This dry etching includes a chemical reaction and a physical collision. Examples of using chemical reaction include reactive gas (gas), ions and ion beams, and those using radicals. Examples of the etching gas used for the reactive ions include sulfur hexafluoride (SF 6 ) and carbon tetrafluoride (CF 4 ). Moreover, what uses an ion beam is mentioned as a thing by physical collision. A method using a gas cluster ion beam (GCIB) is included in those using this ion beam. By scanning the substrate material 20X with a movable stage while etching a narrow region using these etching means, fine etching can be performed satisfactorily even for a large-area material substrate.
- GCIB gas cluster ion beam
- the thickness of the first substrate 10 is reduced by polishing, but this polishing process may be omitted.
- the polishing step is omitted, the first substrate 10 is removed by etching or the like.
- the step of cleaning the substrate or the like is not specified, but the substrate may be cleaned as necessary.
- the substrate cleaning method include various methods such as cleaning using ultrasonic waves, cleaning using an organic solvent, cleaning using a chemical, and cleaning using O 2 ashing. These cleaning methods may be employed in combination.
- the semiconductor layer 20 has been described as an example in which the dopant concentration continuously decreases as the distance from the first substrate 10 increases.
- the semiconductor layer 20 only needs to have the first region 20x and is limited to this example.
- the dopant concentration in the region of the semiconductor layer 20 located on the opposite side of the first substrate 10 across the first region 20x may be equal to or higher than the threshold value, or may be a value similar to the threshold value. Further, it may change stepwise in the thickness direction.
- FIGS. 4 to 6 are process diagrams schematically showing a method of manufacturing a composite substrate according to the second embodiment of the present invention. Note that in this example, a different part from the example of the first embodiment described above will be described, and a duplicate description of similar elements and steps will be omitted.
- a first substrate 10 made of silicon (Si) is prepared as in FIG. 4A.
- the semiconductor layer 20A is formed by stacking a first semiconductor layer 20a and a second semiconductor layer 20b in order from the first substrate 10 side. Specifically, first, as shown in FIG. 4B, the first semiconductor layer 20a is formed.
- the first semiconductor layer 20 a p-type or n-type silicon and having a smaller amount of dopant than the first substrate 10 can be employed.
- the first semiconductor layer 20a is formed so that the dopant concentration gradually decreases from the first substrate 10 side toward the upper surface side.
- the upper surface portion of the first semiconductor layer 20 (the surface opposite to the surface in contact with the first substrate 10) has any one of a relatively low concentration of p ⁇ and n ⁇ dopants, and non-doped. It is formed.
- the p ⁇ dopant concentration include a range of less than 1 ⁇ 10 16 [atoms / cm 3 ].
- Examples of the n ⁇ dopant concentration include a range of less than 5 ⁇ 10 15 [atoms / cm 3 ].
- the first semiconductor layer 20a of the present embodiment employs p-type silicon and is formed so that the dopant concentration of the upper surface portion is p ⁇ . That is, the first semiconductor layer 20 a has the first region 20 x at a portion in contact with the first substrate 10.
- silicon is epitaxially grown on the upper surface of the first semiconductor layer 20a on the arrow D1 direction side to form the second semiconductor layer 20b as shown in FIG. Since the second semiconductor layer 20b is epitaxially grown on the silicon substrate, lattice defects can be reduced as compared with the case where the second semiconductor layer 20b is epitaxially grown on the sapphire substrate.
- the second semiconductor layer 20b p-type or n-type silicon having a higher dopant than the first semiconductor layer 20a can be used.
- the second semiconductor layer 20b is formed so that the dopant concentration gradually increases from the first semiconductor layer 20a side toward the upper surface side on the arrow D1 direction side.
- the upper surface portion of the second semiconductor layer 20 is formed so as to have a dopant concentration of any one of n ++ , n + , p + and p ++ .
- the second semiconductor layer 20b of the present embodiment employs p-type silicon and is formed so that the dopant concentration of the upper surface portion is p ++ .
- the first semiconductor layer 20a and the second semiconductor layer 20b are formed separately, but may be grown continuously.
- the first semiconductor layer 20a and the second semiconductor layer 20b can be integrally formed by adjusting the supply amount of impurities.
- the integrated semiconductor layer 20A is considered to be divided into a first semiconductor layer 20a and a second semiconductor layer 20b with an inflection point where the increase or decrease in dopant concentration changes as a boundary.
- the semiconductor layer 20A formed in this way has the lowest dopant concentration in the thickness direction, and the dopant concentration increases as it approaches the upper surface side and the lower surface side (first substrate 10 side). That is, the semiconductor layer 20 ⁇ / b> A has the first region 20 x on the first substrate 10 side in the thickness direction, and the second region 20 y on the main surface side opposite to the first substrate 10. The second region 20y is formed such that the dopant concentration decreases in the thickness direction from the main surface opposite to the first substrate 10 toward the first substrate 10 side. In this example, the dopant concentration on the main surface of the second region 20y opposite to the first substrate 10 is higher than the threshold value. And between the 1st field 20x and the 2nd field 20y, it has middle field 20z whose dopant concentration is below a threshold.
- the first semiconductor layer 20a and the second semiconductor layer 20b may not be epitaxially grown until the dopant diffusion concentration is saturated.
- the second semiconductor layer 20b of the semiconductor layer 20A is etched from the arrow D1 direction side to reduce the thickness of the second semiconductor layer 20b as shown in FIG.
- This etching can be performed by employing a selective etching solution in which the etching rate varies greatly depending on the difference in dopant concentration.
- This selective etching solution is adjusted so that the etching rate is significantly reduced when the dopant concentration exceeds or falls below a predetermined value.
- Examples of such a selective etching solution include a mixed solution of hydrofluoric acid, nitric acid and acetic acid, and a mixed solution of hydrofluoric acid, nitric acid and water.
- a mixed liquid of hydrofluoric acid, nitric acid, and acetic acid is employed as the etchant in the same manner as the etchant in the first embodiment.
- the second region 20y is etched in the second semiconductor layer 20b.
- the second semiconductor layer whose thickness is reduced by etching is referred to as a second thin layer 21b.
- an insulating second substrate 30 is prepared as in FIG. 1C.
- the second substrate 30 and the upper surface of the second thin layer 21b on the first direction side are bonded together.
- a method of bonding the same method as that used when bonding the second substrate 30 and the semiconductor layer 20 in the first embodiment can be used.
- an intermediate product having the semiconductor layer 20A between the first substrate 10 and the second substrate 30 can be obtained.
- the intermediate product is processed from the arrow D2 direction side to reduce the thickness of the first substrate 10 as shown in FIG.
- a processing method for reducing the thickness the same method as described with reference to FIG. 2B in the first embodiment can be used.
- the first substrate having a reduced thickness is referred to as a first thin substrate 11.
- etching is performed with an etching solution to reduce the thickness of the first semiconductor layer 20a of the semiconductor layer 20A as shown in FIG. 6B.
- This etching can be performed by employing a selective etching solution in which the etching rate varies greatly depending on the difference in dopant concentration. Examples of this selective etching solution include the same etching solutions as described above.
- the first semiconductor layer 20a the first region 20x is etched.
- the first semiconductor layer whose thickness is reduced by etching is referred to as a first thin layer 21a. If the first substrate 10 or the first thin substrate 11 remains, the remaining first substrate 10 or the first thin substrate 11 is also etched.
- the composite substrate 40A having the semiconductor layer 20A ′ whose main surface is bonded to the substrate 30 on the upper surface on the arrow D2 direction side of the insulating substrate 30 as shown in FIG. Can be manufactured.
- substrate 30 points out the 2nd board
- the semiconductor layer 20 ⁇ / b> A ′ refers to a stack of the second thin layer 21 b and the first thin layer 21 a that have been subjected to the above manufacturing method.
- the semiconductor layer 20A ′ is configured by the intermediate region 20z of the semiconductor layer 20A.
- a functional layer including the second thin layer 21b and the first thin layer 21a is bonded to the upper surface of the second substrate 30 on the arrow D2 direction side.
- the dopant of this semiconductor layer is less in the middle of the arrow directions D1 and D2 than both ends.
- the dopant of this functional layer increases as it approaches the both end sides from the middle in the thickness direction.
- the dopant concentration is considered as the magnitude of the electrical resistance
- the electrical resistance of the functional layer decreases as it approaches the both end sides from the middle part in the thickness direction.
- the dopant concentration gradient is formed on the surface to be bonded to the second substrate 30 before bonding to the second substrate 30.
- the gradient before bonding in this way, it is possible to reduce the variation in the thickness of the functional layer formed on the upper surface of the second substrate 30 as compared to the case where the gradient is formed after bonding.
- processing is performed from the lower surface of the first substrate 10, so that it is affected by variations in the thickness of the first substrate 10 or by warping of the second substrate 30. is there. This is particularly effective when a functional layer having a thickness smaller than at least one of the thickness variation of the first substrate 10 and the warpage of the second substrate 30 is formed.
- the dopant concentration in the thickness direction of the semiconductor layer 20A as in the above-described manufacturing method, it is possible to freely design the dopant concentration of the portion that remains as the functional layer. For example, even when a dopant concentration equal to or higher than a threshold is required for the functional layer, a functional layer having a desired dopant concentration can be accurately manufactured with a desired thickness.
- an etching process for removing the second region of the second semiconductor layer 20b is provided before bonding to the second substrate 30, but this process is performed when a low-resistance layer is left as a functional layer. May be omitted.
- the second region 20y is formed so as to have a dopant concentration equal to or higher than the threshold value on the main surface opposite to the first substrate 10, but may be equal to or lower than the threshold value.
- the semiconductor layers 20 and 20A so as to have a thickness equal to or larger than the waviness of the second substrate 30.
- the thickness is preferably 10 ⁇ m or more because it has a waviness of about 10 ⁇ m.
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Abstract
Description
まず、図1(a)に示したように、ドーパントを有する第1シリコン(Si)で形成された第1基板10を準備する。この第1基板10の第1シリコンとしては、p型またはn型のシリコンが採用できる。この第1基板10のドーパント濃度としては、相対的に高濃度のp++およびn++、ならびに中濃度のp+およびn+のものが採用できる。p++のドーパント濃度としては、1×1018以上1×1021〔atoms/cm3〕以下の範囲が挙げられる。p+のドーパント濃度としては、1×1016以上1×1018〔atoms/cm3〕未満の範囲が挙げられる。n++のドーパント濃度としては、5×1017以上1×1021〔atoms/cm3〕以下の範囲が挙げられる。n+のドーパント濃度としては、5×1015以上5×1017〔atoms/cm3〕未満の範囲が挙げられる。本実施形態では、p型でドーパント濃度がp++のものを第1基板として採用する。なお、「p」および「n」の右上に記載している「++」および「+」の記載は、シリコンの抵抗値を基準とするものである。
図4~6は、本発明の第2の実施形態の例の複合基板の製造方法を模式的に示す工程図である。なお、本例においては、前述した第1の実施形態の例と異なる部分について説明し、同様の要素・工程については重複する説明を省略する。
上述の各実施形態の例において、半導体層20,20Aと第2基板30とを接合する際に、半導体層20,20Aのうち第1基板10と反対側の主面をアモルファス状態としてもよい。
11・・・第1薄基板
20・・・半導体層
20x・・・第1領域
20y・・・第2領域
20z・・・中間領域
21・・・機能層
30・・・第2基板
40・・・複合基板
Claims (12)
- ドーパントを有する第1シリコンで形成された第1基板を準備する工程と、
前記第1基板の主面に、第2シリコンをエピタキシャル成長させて半導体層を形成する工程と、
前記半導体層と絶縁性の第2基板とを接合する工程と、
次いで、前記第1基板の側からエッチャントを用いて前記半導体層の厚みの途中まで選択エッチングする工程とを備えており、
前記エッチャントに、前記第1基板のドーパント濃度よりも低いドーパント濃度である閾値のドーパント濃度においてシリコンに対するエッチングレートが一定値以上低下するものを用いるとともに、
前記半導体層を形成する工程において、前記半導体層を、前記第1基板に接し、前記第1基板から離れるにつれてドーパント濃度が前記閾値まで低下する第1領域を厚み方向に有するように形成する、複合基板の製造方法。 - 前記半導体層を形成する工程において、前記半導体層を、前記第1基板から離れるにつれてドーパント濃度が低下するように形成する、請求項1に記載の複合基板の製造方法。
- 前記半導体層を形成する工程において、前記半導体層のエピタキシャル成長を、前記第1基板から前記ドーパントを拡散させながら行ない、拡散によるドーパント濃度が飽和する前に終わらせる、請求項2に記載の複合基板の製造方法。
- 前記半導体層を形成する工程において、前記半導体層を、前記第1基板と反対側の主面から前記第1基板側に向かうにつれて、ドーパント濃度が低下する第2領域を厚み方向に有するように形成する、請求項1に記載の複合基板の製造方法。
- 前記半導体層を形成する工程において、前記半導体層を、前記第2領域の前記第1基板と反対側の主面におけるドーパント濃度が前記閾値よりも高くなるように形成する、請求項4に記載の複合基板の製造方法。
- 前記半導体層を形成する工程において、前記半導体層を、前記第1領域と前記第2領域との間に、ドーパント濃度が前記閾値以下である中間領域を有するように形成する、請求項4または5に記載の複合基板の製造方法。
- 前記半導体層を形成する工程と、前記半導体層と前記第2基板とを接合する工程との間に、前記半導体層の前記第2領域の厚み方向の一部をエッチングによって除去する工程をさらに備える、請求項4乃至6のいずれかに記載の複合基板の製造方法。
- 前記半導体層を形成する工程において、前記半導体層を、厚みが前記第2基板のうねり以上の厚みとなるように形成する、請求項1乃至7のいずれかに記載の複合基板の製造方法。
- 前記半導体層と前記第2基板とを接合する工程において、前記半導体層および前記第2基板の接合する主面同士を活性化して常温で接触させることによって両者の接合を行なう、請求項1乃至8のいずれかに記載の複合基板の製造方法。
- 前記半導体層と前記第2基板とを接合する工程において、前記半導体層のうち前記第1基板と反対側の主面をアモルファス状態にする、請求項1乃至9のいずれかに記載の複合基板の製造方法。
- 絶縁性の基板と、一方主面が該基板の上面に接合されている半導体層とを備え、
前記半導体層のドーパント濃度は、他方主面から前記基板側に近づくにつれて低くなっている、複合基板。 - 絶縁性の基板と、一方主面が該基板の上面に接合されている半導体層とを備え、
前記半導体層のドーパント濃度は、厚み方向の途中から、他方主面側および前記基板側に近づくにつれて高くなっている、複合基板。
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JP2017216411A (ja) * | 2016-06-02 | 2017-12-07 | 株式会社Sumco | 接合ウェーハの製造方法および接合ウェーハ |
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