WO2020105522A1 - 保持装置および保持装置の製造方法 - Google Patents
保持装置および保持装置の製造方法Info
- Publication number
- WO2020105522A1 WO2020105522A1 PCT/JP2019/044467 JP2019044467W WO2020105522A1 WO 2020105522 A1 WO2020105522 A1 WO 2020105522A1 JP 2019044467 W JP2019044467 W JP 2019044467W WO 2020105522 A1 WO2020105522 A1 WO 2020105522A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- coat layer
- heating resistor
- power receiving
- receiving electrode
- power supply
- Prior art date
Links
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- 229910052719 titanium Inorganic materials 0.000 claims abstract description 44
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- QIJNJJZPYXGIQM-UHFFFAOYSA-N 1lambda4,2lambda4-dimolybdacyclopropa-1,2,3-triene Chemical compound [Mo]=C=[Mo] QIJNJJZPYXGIQM-UHFFFAOYSA-N 0.000 description 2
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- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 2
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- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 1
- 229910001020 Au alloy Inorganic materials 0.000 description 1
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
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Images
Classifications
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- H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
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- H01L21/68792—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support characterised by the construction of the shaft
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- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/023—Industrial applications
- H05B1/0233—Industrial applications for semiconductors manufacturing
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
- C04B2237/70—Forming laminates or joined articles comprising layers of a specific, unusual thickness
- C04B2237/704—Forming laminates or joined articles comprising layers of a specific, unusual thickness of one or more of the ceramic layers or articles
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
- C04B2237/76—Forming laminates or joined articles comprising at least one member in the form other than a sheet or disc, e.g. two tubes or a tube and a sheet or disc
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
- C04B2237/86—Joining of two substrates at their largest surfaces, one surface being complete joined and covered, the other surface not, e.g. a small plate joined at it's largest surface on top of a larger plate
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/016—Heaters using particular connecting means
Definitions
- the technology disclosed in the present specification relates to a holding device that holds an object.
- a heating device (also called “susceptor”) that holds an object (eg, semiconductor wafer) and heats it to a predetermined temperature (eg, about 400 to 800 ° C.) is known.
- the heating device is used as a part of a semiconductor manufacturing device such as a film forming device (CVD film forming device, sputtering film forming device, etc.) or an etching device (plasma etching device, etc.).
- the heating device includes a ceramic member formed of a ceramic sintered body. Inside the ceramic member, a heating resistor made of metal such as tungsten (W) or molybdenum (Mo) is arranged. Further, the heating device includes a conductive power supply connecting member that is in contact with the heating resistor and a conductive power supply terminal that is electrically connected to the power supply connecting member. When a voltage is applied to the heating resistor via the power supply terminal and the power supply connecting member, the heating resistor generates heat and the object held on the surface of the ceramic member (hereinafter referred to as “holding surface”) is heated. To be done.
- a compact body of the ceramic member material in which the material of the heating resistor is disposed is fired at a high temperature (for example, about 1700 ° C. to 1900 ° C.), so that a dense ceramic firing is performed.
- a ceramic member formed by the united body and a heating resistor arranged inside the ceramic member are produced.
- impurities for example, carbon
- An altered layer for example, a tungsten carbide layer or a molybdenum carbide layer
- the resistance value of the heating resistor will fluctuate (variation within the product and / or between products), and this will fluctuate the amount of heat generated by the heating resistor.
- the temperature of the holding surface of the ceramic member (and thus the temperature of the object held on the holding surface) may vary.
- Patent Document 1 there is known a technique of suppressing the formation of an altered layer on the surface of the heating resistor by adjusting the relative density of the ceramic member and the firing conditions (see, for example, Patent Document 1).
- the above conventional technology focuses only on the altered layer formed on the surface of the heating resistor.
- an impurity layer may be formed on the surface of the power supply connecting member due to the reaction of impurities derived from the atmosphere in the furnace or the raw material with the power supply connecting member. Due to the formation of the layer, connection failure between the power supply connection member and the heat generation resistor or the power supply terminal, or variation in the heat generation amount of the heat generation resistor due to variation in the resistance value of the power supply connection member may occur. I found a new issue that there is.
- such a problem is not limited to the heating device having the above-described configuration, and a ceramic member formed of a ceramic sintered body, a metal heating resistor disposed inside the ceramic member, and a heating resistor.
- This is a common problem for holding devices that hold an object on the surface of a ceramic member, the holding device including a conductive power supply connecting member in contact with the power supply connecting member and a conductive power supply terminal electrically connected to the power supplying connection member.
- the holding device disclosed in the present specification has a first surface and is arranged inside a ceramic member formed of a ceramic sintered body containing aluminum nitride as a main component.
- the ceramic heat generating resistor includes: a heat generating resistor made of metal; a conductive power supply connecting member in contact with the heat generating resistor; and a conductive power supply terminal electrically connected to the power supplying connecting member.
- a part of the surface of the power supply connecting member excluding the contact surface with the heating resistor and the connection surface with the power supply terminal is Al. It is covered with a second coat layer formed of a nitride containing at least one of Ti, Zr, V, Ta and Nb.
- the power supply connecting member reacts with impurities to form an altered layer on the surface of the power supply connecting member during firing of the ceramic member. It is possible to prevent the occurrence of a connection failure between the power supply connection member and the heat generation resistor or the power supply terminal, and the variation in the heat generation amount of the heat generation resistor due to the variation in the resistance value of the power supply connection member. Generation can be suppressed, and as a result, variations in the temperature of the first surface of the ceramic member (and by extension, the temperature of the object held on the first surface) can be suppressed.
- the second coat layer is formed of a nitride containing at least one of Al, Ti, Zr, V, Ta and Nb, so that it has heat resistance during high temperature firing and mainly contains aluminum nitride. It is less likely to cause element diffusion into the ceramic member as a component. Therefore, according to the present holding device, the occurrence of the characteristic change of the ceramic member due to the element diffusion from the second coat layer is suppressed, and the presence of the second coat layer having high heat resistance allows the power supply connection member to be formed. It is possible to suppress the formation of an altered layer on the surface, which in turn can suppress the occurrence of a connection failure between the power supply connection member and the heating resistor or the power supply terminal, and at the same time, the resistance value of the power supply connection member. Of the heat-generating resistor due to the variation of the temperature of the heating member, and as a result, the variation of the temperature of the first surface of the ceramic member (and thus the temperature of the object held on the first surface). Can be suppressed.
- At least a part of a surface of the power supply connecting member that contacts the heating resistor contains at least one of Ti, Zr, V, Cr, Ta, and Nb. It may be configured to be covered with the first coat layer formed of nitride. If such a configuration is adopted, due to the existence of the first coat layer that covers the surface of the power supply connecting member, the power supply connecting member reacts with impurities during firing of the ceramic member, and the altered layer is formed on the surface of the power supplying connecting member.
- the first coat layer is formed of a nitride containing at least one of Ti, Zr, V, Cr, Ta and Nb, it has heat resistance during high temperature firing, and mainly contains aluminum nitride.
- the element is less likely to diffuse into the ceramic member as a component, and further has electrical conductivity, so that electrical connection between the power supply connecting member and the heating resistor can be secured. Therefore, according to the present holding device, it is possible to prevent the electrical connection between the power supply connection member and the heating resistor from being hindered by the first coat layer, and at the same time, perform the element diffusion from the first coat layer.
- the thickness of the first coat layer may be 0.3 ⁇ m or more and 60 ⁇ m or less. If such a configuration is adopted, the thickness of the first coat layer is not excessively thin (0.3 ⁇ m or more). Therefore, the presence of the first coat layer causes a deteriorated layer on the surface of the power supply connecting member. The formation can be more reliably suppressed. Further, if such a configuration is adopted, the thickness of the first coat layer is not excessively thick (60 ⁇ m or less), and therefore the difference in linear expansion between the power supply connecting member and the first coat layer is not caused. It is possible to reduce the stress caused in the first coat layer due to this, and it is possible to prevent the occurrence of a situation in which the stress causes a crack in the first coat layer to prevent the formation of an altered layer.
- At least a part of the surface of the heating resistor other than the contact surface with the power supply connecting member is at least one of Al, Ti, Zr, V, Ta, and Nb. It may be configured to be covered with the third coat layer formed of a nitride containing. If such a configuration is adopted, due to the presence of the third coating layer that covers the surface of the heating resistor, the heating resistor reacts with the impurities during firing of the ceramic member, and the altered layer is formed on the surface of the heating resistor. It is possible to suppress the formation of the heat generation resistor, and it is possible to suppress the variation in the amount of heat generated by the heating resistor due to the variation in the resistance value of the heating resistor.
- the third coat layer is formed of a nitride containing at least one of Al, Ti, Zr, V, Ta, and Nb, it has heat resistance during high-temperature firing and mainly contains aluminum nitride. It is less likely to cause element diffusion into the ceramic member as a component. Therefore, if such a configuration is adopted, the occurrence of the characteristic change of the ceramic member due to the element diffusion from the third coat layer is suppressed, and the presence of the third coat layer having high heat resistance enables the heat generation resistance to be increased.
- Formation of an altered layer on the surface of the body can be suppressed, which in turn can suppress variations in the resistance value (heat generation amount) of the heating resistor, and as a result, on the first surface of the ceramic member. It is possible to suppress variations in temperature (and thus in temperature of the object held on the first surface).
- a ceramic member having a first surface and formed of a ceramic sintered body containing aluminum nitride as a main component, and the ceramic member A ceramic heating resistor provided inside, a conductive power feeding connection member in contact with the heating resistor, and a conductive power feeding terminal electrically connected to the power feeding connection member, the ceramics
- a method of manufacturing a holding device for holding an object on the first surface of a member comprising: a contact surface between the heating resistor and a connection surface between the power supply terminal and the surface of the power supply connection member.
- the power supply connecting member due to the presence of the coat layer covering the surface of the power supply connecting member, the power supply connecting member reacts with impurities to form an altered layer on the surface of the power supply connecting member during firing of the ceramic member.
- the coating layer is formed of a nitride containing at least one of Al, Ti, Zr, V, Ta and Nb, it has heat resistance during high temperature firing and contains aluminum nitride as a main component. It is difficult for the element to diffuse into the ceramic member.
- the manufacturing method of the present holding device while the occurrence of characteristic changes of the ceramic member due to element diffusion from the coat layer is suppressed, the presence of the coat layer having high heat resistance deteriorates the surface of the power supply connecting member. It is possible to suppress the formation of the layer, by extension, it is possible to suppress the occurrence of connection failure between the power supply connection member and the heating resistor or the power supply terminal, and to the dispersion of the resistance value of the power supply connection member. It is possible to suppress the variation in the amount of heat generated by the heating resistor, and as a result, to suppress the variation in the temperature of the first surface of the ceramic member (and thus the temperature of the object held on the first surface). be able to.
- FIG. 1 is a perspective view schematically showing an outer appearance configuration of a heating device 100 in the present embodiment
- FIG. 2 is an explanatory diagram schematically showing an XZ sectional configuration of the heating device 100 in the present embodiment
- 3 is an explanatory view showing an enlarged XZ cross-sectional configuration of the heating device 100 in the X1 portion of FIG. 2.
- XYZ axes which are orthogonal to each other for specifying the directions are shown.
- the Z-axis positive direction is referred to as the upward direction
- the Z-axis negative direction is referred to as the downward direction, but the heating device 100 is actually installed in an orientation different from such an orientation. May be.
- the heating device 100 is a device that holds an object (for example, a semiconductor wafer W) and heats it to a predetermined temperature (for example, about 400 to 800 ° C.), and is also called a susceptor.
- the heating device 100 is used, for example, as a semiconductor manufacturing equipment component forming a semiconductor manufacturing device such as a film forming device (CVD film forming device, sputtering film forming device, etc.) or an etching device (plasma etching device, etc.).
- the heating device 100 corresponds to the holding device in the claims.
- the heating device 100 includes a holding member 10 and a supporting member 20.
- the holding member 10 has one surface (hereinafter referred to as “holding surface”) S1 that is substantially orthogonal to the Z-axis direction (vertical direction) and a surface opposite to the holding surface S1 (hereinafter referred to as “rear surface”). S2 and a substantially disk-shaped member.
- the holding member 10 is formed of a ceramics sintered body containing aluminum nitride (AlN) as a main component.
- AlN aluminum nitride
- the main component means a component having the largest content ratio (weight ratio).
- the diameter of the holding member 10 is, for example, 100 mm or more and 500 mm or less, and the thickness (dimension in the Z-axis direction) of the holding member 10 is, for example, 3 mm or more and 30 mm or less.
- the holding member 10 corresponds to the ceramic member in the claims, and the holding surface S1 corresponds to the first surface in the claims.
- the back surface S2 of the holding member 10 is formed with a pair of recesses 12 corresponding to a pair of terminal members 70 and a pair of power receiving electrodes 53 described later.
- the shape of the cross section (XY cross section) of each recess 12 orthogonal to the Z-axis direction is, for example, a substantially circular shape.
- the support member 20 is a substantially tubular member extending in the Z-direction.
- the support member 20 is formed of, for example, a ceramic sintered body containing aluminum nitride or alumina (Al 2 O 3 ) as a main component.
- the outer diameter of the support member 20 is, for example, about 30 mm or more and 90 mm or less, and the height (dimension in the Z-axis direction) of the support member 20 is, for example, about 100 mm or more and 300 mm or less.
- the support member 20 is formed with a through hole 22 extending in the Z-axis direction from the upper surface S3 to the lower surface S4 of the support member 20.
- the shape of the cross section (XY cross section) of the through hole 22 orthogonal to the Z-axis direction is, for example, a substantially circular shape.
- the inner diameter of the through hole 22 is, for example, about 10 mm or more and 70 mm or less.
- the holding member 10 and the supporting member 20 are arranged such that the back surface S2 of the holding member 10 and the upper surface S3 of the supporting member 20 face each other in the Z-axis direction, and the holding member 10 and the supporting member 20. 20 and 20 are arranged so as to be substantially coaxial with each other, and are joined to each other via a joining portion 30 formed of a known joining material.
- a heating resistor 50 as a heater for heating the holding member 10 is arranged inside the holding member 10.
- the heating resistor 50 has, for example, a pattern extending in a substantially spiral shape when viewed in the Z-axis direction.
- the heating resistor 50 is made of, for example, a metal such as tungsten (W) or molybdenum (Mo).
- the overall diameter of the heating resistor 50 when viewed in the Z-axis direction is, for example, about 70 mm or more and 450 mm or less, and the line width of the heating resistor 50 when viewed in the Z-axis direction is, for example, about 0.1 mm or more and 10 mm or less.
- the thickness (size in the Z-axis direction) of the heating resistor 50 is, for example, about 0.1 mm or more and about 3 mm or less.
- the holding member 10 is provided with a pair of power receiving electrodes 53.
- Each power receiving electrode 53 is, for example, a substantially circular plate-shaped member when viewed in the Z-axis direction.
- Each power receiving electrode 53 is formed of a conductive material such as tungsten or molybdenum.
- the thickness of the power receiving electrode 53 is, for example, about 0.1 mm or more and 5 mm or less. In the present embodiment, the power receiving electrode 53 corresponds to the power supply connecting member in the claims.
- One of the pair of power receiving electrodes 53 is exposed on the bottom surface of one of the pair of recesses 12 formed on the back surface S2 of the holding member 10, and the upper surface S6 forms a substantially spiral pattern.
- the heating resistor 50 is electrically connected to the heating resistor 50 by coming into contact with the lower surface S5 near one end of the heating resistor 50.
- the other of the pair of power receiving electrodes 53 is exposed at the bottom of the other of the pair of recesses 12 formed on the back surface S2 of the holding member 10, and the upper surface S6 of the heating resistor 50.
- the heating resistor 50 is electrically connected by coming into contact with the lower surface S5 near the other end.
- each terminal member 70 is, for example, a substantially columnar member.
- Each terminal member 70 is formed of a conductive material such as nickel or titanium.
- the diameter of the terminal member 70 is, for example, about 3 mm or more and about 8 mm or less. In the present embodiment, the terminal member 70 corresponds to the power supply terminal in the claims.
- the upper end portion of one of the pair of terminal members 70 is housed in one of the pair of recesses 12 formed on the back surface S2 of the holding member 10, and is connected to the power receiving electrode 53 exposed on the bottom surface of the recess 12. , Are joined by the brazing part 56.
- the upper end portion of the other of the pair of terminal members 70 is housed in the other of the pair of recesses 12 formed on the back surface S2 of the holding member 10, and the power receiving electrode exposed on the bottom surface of the recess 12 is formed. 53 and the brazing portion 56.
- Each brazing part 56 is formed by using a metal brazing material such as Ni alloy (Ni—Cr alloy) or Au alloy (Au—Ni alloy) or pure Au.
- Each terminal member 70 is electrically connected to the power receiving electrode 53 via the brazing portion 56.
- the heating resistor 50 when a voltage is applied to the heating resistor 50 via the terminal members 70 and the power receiving electrodes 53 from a power source (not shown), the heating resistor 50 generates heat, thereby holding The object (for example, the semiconductor wafer W) held on the holding surface S1 of the member 10 is heated to a predetermined temperature (for example, about 400 to 800 ° C.).
- a predetermined temperature for example, about 400 to 800 ° C.
- the terminal member 70 and the heating resistor 50 are connected via the power receiving electrode 53, and therefore, due to the difference in thermal expansion between the terminal member 70 and the heating resistor 50. The stress that occurs can be relaxed.
- the first coat layer 61 is formed of a nitride containing at least one of Ti, Zr, V, Cr, Ta, and Nb, and has conductivity. That is, the first coat layer 61 is formed of, for example, ZrN, TiN, (Al, Ti) N, (Al, Cr) N, VN, (Ti, Cr) N, (Al, Ti, Cr) N, (Al).
- the thickness t1 of the first coat layer 61 is preferably 0.3 ⁇ m or more and 60 ⁇ m or less, and more preferably 1.0 ⁇ m or more and 50 ⁇ m or less.
- the porosity of the first coat layer 61 is preferably 30% or less, more preferably 10% or less.
- the contact surface of the surface of the power receiving electrode 53 with the heating resistor 50 refers to the surface of the power receiving electrode 53 directly or to another object (for example, the first coat). The surface facing the heating resistor 50 through the layer 61).
- the second coat layer at least a part of the surface of the power receiving electrode 53 excluding the contact surface with the heating resistor 50 and the connection surface with the terminal member 70 is the second coat layer. It is covered with 62. More specifically, most of the surface of the power receiving electrode 53 (for example, 80% or more) excluding the contact surface with the heating resistor 50 and the connection surface with the terminal member 70 is the second coat layer. It is covered with 62.
- the second coat layer 62 is formed of a nitride containing at least one of Al, Ti, Zr, V, Ta and Nb.
- the second coat layer 62 includes, for example, AlN, TiN, ZrN, (Al, Ti) N, (Al, Ti, Si) N, (Al, Ti, Cr) N, (Al, Cr) N, It is formed of VN, TaN, NbN, or the like.
- the thickness of the second coat layer 62 is preferably 0.3 ⁇ m or more and 60 ⁇ m or less.
- the porosity of the second coat layer 62 is preferably 30% or less, more preferably 10% or less.
- connection surface of the surface of the power receiving electrode 53 with the terminal member 70 refers to the surface of the power receiving electrode 53 directly or through another object, the terminal member 70, Alternatively, it means a surface facing the brazing portion 56 that joins the power receiving electrode 53 and the terminal member 70.
- the second coat layer 62 covers all or part of the surface of the power receiving electrode 53 that contacts the heating resistor 50 and / or the surface that connects to the terminal member 70.
- the second coat layer 62 is conductive (for example, when the second coat layer 62 is formed of a nitride containing at least one of Ti, Zr, V, Ta, and Nb). Even if the second coating layer 62 covers all or a part of the contact surface with the heating resistor 50 and / or the connection surface with the terminal member 70 in the surface of the power receiving electrode 53, When the conduction between the heating resistor 50 and / or the terminal member 70 is not affected, but the second coat layer 62 is not conductive (for example, when the second coat layer 62 is formed of AlN).
- the second coating layer 62 is a contact surface of the surface of the power receiving electrode 53 with the heating resistor 50. And / or it is preferable that at least a part of the connection surface with the terminal member 70 is not covered.
- the first coat layer 61 and the second coat layer 62 contain B, C, and O elements. It is preferable not to contain it.
- the first coat layer 61 and the second coat layer 62 are made of the same material (that is, both are conductive), the first coat layer 61 and the second coat layer 61 are formed on the surface of the power receiving electrode 53.
- the coat layer 62 it is not necessary to perform a special treatment (for example, a treatment for masking a portion where conduction is to be secured), and the film can be formed in the same step, and therefore, the manufacturing process It is possible to realize simplification and cost reduction.
- the third coat layer 63 is covered with the third coat layer 63. More specifically, most (for example, 80% or more) of the surface of the heating resistor 50 excluding the contact surface with the power receiving electrode 53 is covered with the third coat layer 63.
- the third coat layer 63 is formed of a nitride containing at least one of Al, Ti, Zr, V, Ta, and Nb.
- the third coat layer 63 includes, for example, AlN, TiN, ZrN, (Al, Ti) N, (Al, Ti, Si) N, (Al, Ti, Cr) N, (Al, Cr) N, It is formed of VN, TaN, NbN, or the like.
- the thickness of the third coat layer 63 is preferably 0.3 ⁇ m or more and 60 ⁇ m or less.
- the porosity of the third coat layer 63 is preferably 30% or less, more preferably 10% or less.
- the contact surface of the surface of the heating resistor 50 with the power receiving electrode 53 refers to the surface of the heating resistor 50 directly or to another object (for example, the first surface). The surface facing the power receiving electrode 53 through the coat layer 61) is meant.
- the surface of the heating resistor 50 excluding the contact surface with the power receiving electrode 53 is covered with the third coat layer 63
- the surface of the heating resistor 50 is When paying attention to the surface of the heating resistor 50 other than the contact surface, it means that all or part of the surface is covered with the third coat layer 63.
- the third coat layer 63 is conductive (for example, when the third coat layer 63 is formed of a nitride containing at least one of Ti, Zr, V, Ta, and Nb).
- the third coating layer 63 covers all or part of the contact surface with the power receiving electrode 53 in the surface of the heat generating resistor 50, conduction is maintained between the heat generating resistor 50 and the power receiving electrode 53.
- the third coat layer 63 is not conductive (for example, when the third coat layer 63 is formed of AlN), conduction between the heating resistor 50 and the power receiving electrode 53 is established. In order to ensure the above, it is preferable that the third coat layer 63 does not cover at least a part of the contact surface of the heating resistor 50 with the power receiving electrode 53.
- the third coat layer 63 does not contain B, C, and O elements.
- FIG. 4 is a flowchart showing an example of a method for manufacturing the heating device 100 of this embodiment.
- a heating resistor 50 made of a metal or mesh for example, tungsten or molybdenum
- the third coat layer 63 which is a nitride containing at least one of Al, Ti, Zr, V, Ta, and Nb, is formed on most of the surface excluding the contact surface with the power receiving electrode 53. Yes (S110).
- the third coat layer 63 is formed, for example, by masking a region where the third coat layer 63 is not formed on the surface of the heating resistor 50 and performing thermal spraying, sputtering, CVD, PVD, or the like.
- a power receiving electrode 53 made of a plate-shaped conductive material for example, tungsten or molybdenum
- a conductive first coat layer 61 which is a nitride containing at least one of Ti, Zr, V, Cr, Ta and Nb. (S120).
- a part of the surface of the power receiving electrode 53 excluding the contact surface with the heating resistor 50 is provided with Al.
- a second coat layer 62 which is a nitride containing at least one of Ti, Zr, V, Ta, and Nb, is formed (S120). That is, the second coat layer 62 is also formed on the surface of the power receiving electrode 53, which is the connection surface with the terminal member 70.
- the first coat layer 61 and the second coat layer 62 are sprayed, for example, by masking a region where the first coat layer 61 and the second coat layer 62 are not formed on the surface of the power receiving electrode 53. It is formed by performing sputtering, CVD, PVD, or the like.
- the holding member 10 is manufactured as follows (S130). That is, a mixed raw material powder in which an appropriate amount (for example, 5 parts by weight) of yttrium oxide powder is added to aluminum nitride powder (for example, 95 parts by weight) as needed is filled in a mold and uniaxially pressed to obtain a molded body. Forming a first layer of. On the first layer, the heating resistor 50 having the third coat layer 63 formed thereon and the power receiving electrode 53 having the first coat layer 61 and the second coat layer 62 formed thereon are both ( They are placed in contact with each other (via the first coat layer 61).
- S130 a mixed raw material powder in which an appropriate amount (for example, 5 parts by weight) of yttrium oxide powder is added to aluminum nitride powder (for example, 95 parts by weight) as needed is filled in a mold and uniaxially pressed to obtain a molded body. Forming a first layer of. On the first layer, the heating resistor 50 having the third coat layer
- the mixed raw material powder is filled on the heating resistor 50 and the power receiving electrode 53 by a predetermined thickness to form a second layer of the molded body.
- a predetermined thickness for example, temperature: 1700 ° C. to 1900 ° C., pressure: 1 MPa to 20 MPa, time: 1 hour to 5 hours.
- the recess 12 on the back surface S2 of the holding member 10 is formed, for example, by performing a grinding process using a grinding tool after the hot press firing described above. This grinding process is performed until the power receiving electrode 53 is exposed. By this grinding process, the portion of the second coat layer 62 formed on the surface of the power receiving electrode 53 that is formed on the connection surface with the terminal member 70 is removed, and the surface of the power receiving electrode 53 is removed at this portion. Exposed. Even if the thickness of the power receiving electrode 53 is made thicker than that of the heating resistor 50 and the power receiving electrode 53 is slightly ground by a grinding tool during the grinding process for forming the recess 12, the power receiving electrode 53 is not damaged. It is preferable to do so.
- the support member 20 is manufactured as follows (S140). That is, a mixture of aluminum nitride powder (for example, 100 parts by weight) with an appropriate amount (for example, 1 part by weight) of yttrium oxide powder, PVA binder (for example, 3 parts by weight), a dispersant, and a plasticizer, if necessary, such as methanol.
- the organic solvent is added and mixed by a ball mill to obtain a slurry, and the slurry is granulated by a spray dryer to prepare a raw material powder.
- This raw material powder is cold isostatically pressed at a predetermined pressure (for example, 100 MPa to 250 MPa) to obtain a compact.
- the through hole 22 in the support member 20 may be formed by using a rubber mold during molding, or may be formed by performing a machining process after molding or firing.
- the obtained molded body is degreased in air at, for example, 600 ° C., and the degreased body is hung in a furnace in a nitrogen gas atmosphere and subjected to predetermined conditions (for example, temperature: 1800 ° C. to 1900 ° C., time: 4 hours
- the supporting member 20 is manufactured by firing for about 6 hours.
- the holding member 10 and the supporting member 20 are joined (S150). That is, after lapping the back surface S2 of the holding member 10 and the top surface S3 of the support member 20 as necessary, at least one of the back surface S2 of the holding member 10 and the top surface S3 of the support member 20 is, for example, alkaline earth.
- a well-known bonding agent such as a rare earth or aluminum complex oxide is mixed with an organic solvent or the like to form a paste, which is uniformly applied, and then degreasing is performed.
- the back surface S2 of the holding member 10 and the upper surface S3 of the support member 20 are overlapped with each other, and are subjected to predetermined conditions (for example, temperature: 1400 ° C.
- the joint portion 30 for joining the holding member 10 and the support member 20 is formed by hot press firing at about 0 ° C. and a pressure of about 0.5 MPa to 10 MPa).
- the terminal member 70 is inserted into the through hole 22 of the support member 20, and the upper end portion of the terminal member 70 is brazed to the power receiving electrode 53 to form the brazing portion 56 (S160).
- the heating device 100 having the above-described configuration is manufactured mainly by the above manufacturing method.
- the heating device 100 of the present embodiment has the holding surface S1 and is arranged inside the holding member 10 and the holding member 10 formed of a ceramics sintered body containing aluminum nitride as a main component.
- the holding surface of the holding member 10 includes a metal heating resistor 50, a conductive power receiving electrode 53 in contact with the heating resistor 50, and a conductive terminal member 70 electrically connected to the power receiving electrode 53.
- the holding device holds an object such as a semiconductor wafer W on S1.
- at least a part of the surface of the power receiving electrode 53 excluding the contact surface with the heating resistor 50 and the connection surface with the terminal member 70 is Al, Ti, Zr, and V.
- the molded body of the material of the holding member 10 in which the materials of the heating resistor 50 and the power receiving electrode 53 are arranged is set to a high temperature (for example, By firing at 1700 ° C. to 1900 ° C.), the holding member 10 formed of a dense ceramic sintered body, the heating resistor 50 and the power receiving electrode 53 arranged inside the holding member 10 are manufactured.
- impurities for example, carbon
- the power receiving electrode 53 An altered layer (for example, a tungsten carbide layer or a molybdenum carbide layer) may be formed on the surface of 53.
- the altered layer is formed on the surface of the power receiving electrode 53, there is a possibility that a poor connection may occur between the power receiving electrode 53 and the heating resistor 50 or the terminal member 70, and the resistance value of the power receiving electrode 53 may vary.
- the power receiving electrode 53 reacts with impurities during firing of the holding member 10 to prevent the power receiving electrode 53 from forming. It is possible to suppress the formation of an altered layer on the surface, and it is therefore caused by the occurrence of connection failure between the power receiving electrode 53 and the heating resistor 50 or the terminal member 70, and the variation in the resistance value of the power receiving electrode 53. It is possible to suppress the variation in the amount of heat generated by the heat generating resistor 50.
- the second coat layer 62 formed on the surface of the power receiving electrode 53 is formed of a nitride containing at least one of Al, Ti, Zr, V, Ta, and Nb, it is possible to perform high temperature firing. It has heat resistance and is less likely to cause element diffusion into the holding member 10 containing aluminum nitride as a main component.
- the heating device 100 of the present embodiment while suppressing the occurrence of the characteristic change of the holding member 10 due to the element diffusion from the second coat layer 62, the second coat layer 62 having high heat resistance can be formed. Due to the presence, it is possible to suppress the formation of an altered layer on the surface of the power receiving electrode 53, and thus suppress the occurrence of a poor connection between the power receiving electrode 53 and the heating resistor 50 or the terminal member 70. In addition, it is possible to suppress the variation in the amount of heat generated by the heating resistor 50 due to the variation in the resistance value of the power receiving electrode 53.
- the second coat layer 62 is conductive (for example, when the second coat layer 62 is formed of a nitride containing at least one of Ti, Zr, V, Ta, and Nb).
- a special treatment for example, a portion where electrical continuity is to be secured (contact with the heating resistor 50 on the surface of the power receiving electrode 53) Since it is not necessary to perform a process of masking the surface and / or the connection surface with the terminal member 70), the manufacturing process can be simplified and the cost can be reduced.
- the second coat layer 62 is formed of AlN, the difference in thermal expansion between the second coat layer 62 and the holding member 10 and the power receiving electrode 53 becomes relatively small. Even if the thickness of the coat layer 62 is made relatively thick, the occurrence of cracks in the second coat layer 62 can be suppressed.
- At least a part of the contact surface with the heating resistor 50 among the surface of the power receiving electrode 53 is at least one of Ti, Zr, V, Cr, Ta, and Nb. It is covered with the first coat layer 61 formed of the contained nitride. Therefore, due to the presence of the first coat layer 61 that covers the surface of the power receiving electrode 53, the power receiving electrode 53 reacts with impurities to form an altered layer on the surface of the power receiving electrode 53 when the holding member 10 is baked. Of the heat generation amount of the heat generating resistor 50 due to the occurrence of a poor connection between the power receiving electrode 53 and the heat generating resistor 50 or the terminal member 70 and the variation in the resistance value of the power receiving electrode 53.
- the first coat layer 61 formed on the contact surface of the power receiving electrode 53 with the heating resistor 50 includes a nitride containing at least one of Ti, Zr, V, Cr, Ta, and Nb. Since it is formed of a material, it has heat resistance during high-temperature firing, and is unlikely to cause element diffusion into the holding member 10 containing aluminum nitride as a main component. The electrical connection with the heating resistor 50 can be secured.
- the heating device 100 of the present embodiment it is possible to prevent the first coat layer 61 from hindering the electrical connection between the power receiving electrode 53 and the heating resistor 50, and The presence of the first coat layer 61 having high heat resistance forms an altered layer on the surface of the power receiving electrode 53 while suppressing the occurrence of characteristic changes of the holding member 10 due to element diffusion from the coat layer 61. It is possible to effectively suppress the occurrence of a connection failure between the power receiving electrode 53 and the heating resistor 50 or the terminal member 70, and it is possible to reduce the resistance value of the power receiving electrode 53. It is possible to suppress variations in the amount of heat generated by the heating resistor 50.
- the heating resistor 50 in the heating device 100 of the present embodiment, at least part of the surface of the heating resistor 50 excluding the contact surface with the power receiving electrode 53 is at least Al, Ti, Zr, V, Ta, and Nb. It is covered with a third coat layer 63 formed of a nitride containing one. Therefore, in the heating device 100 of the present embodiment, due to the presence of the third coat layer 63 that covers the surface of the heating resistor 50, the heating resistor 50 reacts with impurities during firing of the holding member 10 to generate the heating resistance. It is possible to suppress the formation of an altered layer on the surface of the body 50, and thus suppress the occurrence of variations in the amount of heat generated by the heating resistor 50 due to variations in the resistance value of the heating resistor 50. ..
- the third coat layer 63 is formed of a nitride containing at least one of Al, Ti, Zr, V, Ta and Nb, it has heat resistance at the time of high temperature firing and, at the same time, is formed of aluminum nitride. It is difficult for element diffusion into the holding member 10 containing the main component. Therefore, according to the heating device 100 of the present embodiment, it is possible to suppress the occurrence of the characteristic change of the holding member 10 due to the element diffusion from the third coat layer 63, and to improve the heat resistance of the third coat layer 63. Due to the presence, it is possible to suppress the formation of an altered layer on the surface of the heating resistor 50, and thus suppress the variation in the resistance value (heat generation amount) of the heating resistor 50.
- the third coat layer 63 is conductive (for example, when the third coat layer 63 is formed of a nitride containing at least one of Ti, Zr, V, Ta, and Nb).
- a special treatment for example, a portion where conduction is to be secured (of the surface of the heating resistor 50, a portion of Since it is not necessary to perform a process of masking the contact surface)
- the manufacturing process can be simplified and the cost can be reduced.
- the third coat layer 63 is made of AlN, the difference in thermal expansion between the third coat layer 63 and the holding member 10 and the heating resistor 50 becomes relatively small. Even if the thickness of the coat layer 63 is relatively thick, the occurrence of cracks in the third coat layer 63 can be suppressed.
- the thickness t1 of the first coat layer 61 is preferably 0.3 ⁇ m or more and 60 ⁇ m or less. If such a configuration is adopted, the thickness t1 of the first coat layer 61 is not excessively thin (0.3 ⁇ m or more). Therefore, the presence of the first coat layer 61 causes the surface of the power receiving electrode 53 to be covered. It is possible to more reliably suppress the formation of the altered layer. Further, if such a configuration is adopted, the thickness t1 of the first coat layer 61 is not excessively thick (60 ⁇ m or less), and thus the line between the power receiving electrode 53 and the first coat layer 61 is not formed.
- the thickness t1 of the first coat layer 61 is more preferably 1.0 ⁇ m or more from the viewpoint of more reliably suppressing the formation of an altered layer on the surface of the power receiving electrode 53.
- A-5 Analysis method of the heating device 100: A-5-1.
- Method for specifying the thickness t1 of the first coat layer 61 The method of specifying the thickness t1 of the first coat layer 61 formed on the surface of the power receiving electrode 53 is as follows.
- a cross section polisher process is performed to process the cross section of the sample with an ion beam such as argon ions.
- an ion beam such as argon ions.
- 10 fields of view are imaged and observed using an electron beam microanalyzer (EPMA) for the processed surface.
- the visual field for elemental mapping is 100 ⁇ m ⁇ 100 ⁇ m.
- image analysis software (Analysis Five made by Soft Imaging System GmbH), an interface between the power receiving electrode 53 and the first coat layer 61, and between the first coat layer 61 and the heating resistor 50. Check the interface position and draw a line.
- the shortest distance between the lines drawn on both interfaces is specified as the thickness t1 of the first coat layer 61.
- An average value of the thicknesses t1 of the first coat layers 61 specified in the 10 visual field images is set as the final thickness t1 of the first coat layers 61.
- a method for identifying the presence or absence of a coat layer formed of AlN When the second coat layer 62 is formed of AlN (that is, when the second coat layer 62 is formed of the same material as the holding member 10), the power receiving electrode 53 is the second coat layer of AlN.
- the fact that it is covered by 62 can be specified as follows.
- a cross section polisher process is performed to process the cross section of the sample with an ion beam such as argon ions.
- an ion beam such as argon ions.
- a designated field of view is imaged and observed using a scanning electron microscope (SEM) on the processed surface. It should be noted that the imaging is performed for each of the following two types with five fields of view. (1) The field of view is 100 ⁇ m ⁇ 100 ⁇ m and includes the interface between the power receiving electrode 53 and the holding member 10. (2) The field of view is 1 mm ⁇ 1 mm and includes the interface between the power receiving electrode 53 and the holding member 10.
- the power receiving electrode 53 is covered with the second coating layer 62 of AlN.
- -Requirement 1 When the pore diameter and the number of pores at the interface between the power receiving electrode 53 and the holding member 10 in (1) above are observed, in 10 visual field images, pores of 0.5 ⁇ m or more and 3 ⁇ m or less are on average 2 There is more than one element, and there is no elemental diffusion of components not contained in the holding member 10 and the power receiving electrode 53.
- the second coating layer 62 formed of AlN when the second coating layer 62 formed of AlN is present on the surface, the liquid phase generation reaction at a low temperature due to the reaction between the metal surface oxide and the oxide on the AlN particle surface of the holding member 10 does not occur. Therefore, interface pores tend to remain. In addition, since a difference in sintering behavior is unlikely to occur near the interface and other portions, a difference in concentration of grain boundary phase components is also unlikely to occur. Therefore, if the above two requirements are satisfied, it can be determined that the power receiving electrode 53 is covered with the second coating layer 62 of AlN.
- the heating resistor 50 is made of AlN. Covering with the coat layer 63 can also be specified by the same method.
- Performance evaluation was performed on the point that the above-described effects are obtained by adopting the configuration of the heating device 100 described above. The performance evaluation will be described below. 5 and 6 are explanatory diagrams showing the results of performance evaluation.
- a heating device for 26 samples (SA1 to SA26) was used for performance evaluation.
- Each sample was manufactured by a manufacturing method according to the manufacturing method of the heating device 100 of the above-described embodiment.
- the material of the power receiving electrode 53, the presence or absence of the first coat layer 61 on the surface of the power receiving electrode 53, the material and the thickness t1 the presence or absence of the second coat layer 62 on the surface of the power receiving electrode 53, the material, and the heating resistance.
- the presence or absence and the material of the third coat layer 63 on the surface of the body 50 are different from each other.
- the first coat layer 61 is formed on the surface of the power receiving electrode 53 in the same manner as in the above embodiment, and in the samples SA13, SA14 and S17, The first coat layer 61 was not formed on the surface of the power receiving electrode 53.
- at least one of Ti, Zr, V, Cr, Ta, and Nb was used as the first coat layer 61.
- a nitride containing was used.
- the second coat layer 62 is formed on the surface of the power receiving electrode 53, and in the samples SA13 and SA14, the second coating layer 62 is formed on the surface of the power receiving electrode 53.
- the coat layer 62 was not formed.
- nitriding containing at least one of Al, Ti, Zr, V, Ta, and Nb as the second coating layer 62 was 5 ⁇ m.
- the third coat layer 63 is formed on the surface of the heating resistor 50 as in the above embodiment, and in the samples SA1 to SA10 and SA13 to SA25, the surface of the heating resistor 50 is formed.
- the third coat layer 63 was not formed on.
- AlN was used as the third coat layer 63
- ZrN was used as the third coat layer 63
- the thickness of the third coat layer 63 was 3 ⁇ m.
- the temperature variation of the holding surface S1 of the holding member 10 was measured for each sample. More specifically, a blackened dummy wafer is placed on the holding surface S1 of the holding member 10, and electric power is supplied to the heating resistor 50 via the terminal member 70 to raise the temperature of the heating device of each sample, and the dummy wafer The surface temperature of was measured. The power supplied through the terminal member 70 was maintained at the same value for 15 minutes after the surface temperature of the dummy wafer reached 500 ° C., and then the maximum temperature difference in the dummy wafer was measured as the temperature variation of the holding surface S1. ..
- each sample was heated to 600 ° C., and at the timings of 50 hours and 100 hours, the presence or absence of the terminal member 70 was checked and the holding member 10 was checked for cracks.
- the terminal member 70 was dislocated in the heat resistance test at 600 ° C. for 50 hours. .. Further, in these samples, the temperature variation (temperature difference) of the holding surface S1 was a relatively large value of 10 ° C. or more. In these samples, since the second coating layer 62 does not exist on the surface of the power receiving electrode 53, when the holding member 10 is fired, the impurities in the furnace atmosphere or the raw materials are densified in the holding member 10 before being densified.
- the terminal member 70 did not come off in the heat resistance test at 600 ° C. for 50 hours. Further, in these samples, the temperature variation (temperature difference) of the holding surface S1 was a relatively small value of 9 ° C. or less. In the sample SA17 among these samples, the first coat layer 61 was not formed on the surface of the power receiving electrode 53, but the terminal member 70 did not come off in the heat resistance test at 600 ° C. for 50 hours. The temperature variation (temperature difference) of the holding surface S1 was 9 ° C. or less, which was a relatively small value.
- the power receiving electrode 53 reacts with impurities during firing of the holding member 10 to form an altered layer on the surface of the power receiving electrode 53.
- the occurrence of a poor connection between the power receiving electrode 53 and the terminal member 70 and the variation in the amount of heat generated by the heating resistor 50 due to the variation in the resistance value of the power receiving electrode 53 are suppressed. Thought to be a thing.
- the occurrence of cracks in the holding member 10 was not confirmed in the heat resistance test at 600 ° C. for 50 hours.
- At least a part of the surface of the power receiving electrode 53 excluding the contact surface with the heating resistor 50 and the connection surface with the terminal member 70 is made of Al, Ti, Zr, V, and Ta.
- the second coat layer 62 formed of a nitride containing at least one of Nb formation of an altered layer on the surface of the power receiving electrode 53 can be suppressed, and by extension, It is possible to suppress the occurrence of a poor connection between the power receiving electrode 53 and the heating resistor 50 or the terminal member 70, and the variation in the amount of heat generated by the heating resistor 50 due to the variation in the resistance value of the power receiving electrode 53.
- the temperature variation of the holding surface S1 of the holding member 10 can be suppressed.
- samples SA11, SA12, and SA26 in which the third coat layer 63 is formed on the surface of the heating resistor 50 are included. Then, the temperature variation (temperature difference) of the holding surface S1 was 4 ° C. or less, which was an extremely small value. In these samples, due to the presence of the third coat layer 63 that covers the surface of the heating resistor 50, the heating resistor 50 reacts with impurities when the holding member 10 is fired, and is transformed into the surface of the heating resistor 50.
- the formation of the layer can be suppressed, and the variation in the amount of heat generated by the heating resistor 50 due to the variation in the resistance value of the heating resistor 50 is suppressed.
- at least a part of the surface of the heating resistor 50 excluding the contact surface with the power receiving electrode 53 contains at least one of Al, Ti, Zr, V, Ta, and Nb. It was confirmed that it is preferable to be covered with the third coat layer 63 formed of nitride.
- the samples SA1 to SA12, SA15, SA16, SA18 to SA26 in which the first coat layer 61 is formed on the surface of the power receiving electrode 53 the samples in which the thickness t1 of the first coat layer 61 is less than 0.3 ⁇ m.
- the terminal member 70 is not detached even in the heat resistance test at 600 ° C. for 100 hours. Did not occur.
- the thickness t1 of the first coat layer 61 is not excessively thin (0.3 ⁇ m or more). Therefore, the presence of the first coat layer 61 prevents the surface of the power receiving electrode 53 from being formed. It is possible to more reliably suppress the formation of an altered layer on the first electrode layer 61.
- the thickness t1 of the first coat layer 61 is not excessively thick (60 ⁇ m or less), the power receiving electrode 53 and the first electrode The stress generated in the first coat layer 61 due to the difference in linear expansion between the first coat layer 61 and the second coat layer 61 can be reduced, and the stress causes cracks in the first coat layer 61 to form an altered layer. It is considered that the occurrence of the situation where it could not be suppressed was prevented. From this performance evaluation result, it was confirmed that the thickness t1 of the first coat layer 61 is preferably 0.3 ⁇ m or more and 60 ⁇ m or less.
- the configuration of the heating device 100 in the above embodiment is merely an example, and can be variously modified.
- the power receiving electrode 53 and the terminal member 70 are joined by the brazing portion 56.
- the power receiving electrode 53 in order to relieve the stress due to the difference in thermal expansion between the power receiving electrode 53 and the terminal member 70, the power receiving electrode 53.
- a buffer member made of metal such as Kovar may be disposed between the terminal member 70 and the terminal member 70.
- most of the surface of the power receiving electrode 53 that contacts the heating resistor 50 (for example, 80% or more) is covered with the first coat layer 61. Of these, at least part of the contact surface with the heating resistor 50 may be covered with the first coat layer 61. Further, the formation of the first coat layer 61 may be omitted. Similarly, in the above embodiment, most of the surface (for example, 80% or more) of the surface of the power receiving electrode 53 excluding the contact surface with the heating resistor 50 and the connection surface with the terminal member 70 is the second coating.
- the layer 62 Although covered with the layer 62, at least a part of the surface of the power receiving electrode 53 other than the contact surface with the heating resistor 50 and the connection surface with the terminal member 70 is covered with the second coat layer 62. All you need to know is. Similarly, in the above-described embodiment, of the surface of the heating resistor 50, most of the surface (for example, 80% or more) excluding the contact surface with the power receiving electrode 53 is covered with the third coat layer 63. It suffices that at least a part of the surface of the heating resistor 50 excluding the contact surface with the power receiving electrode 53 is covered with the third coat layer 63. The formation of the third coat layer 63 may be omitted.
- one heating resistor 50 is arranged inside the holding member 10, but a plurality of heating resistors 50 may be arranged inside the holding member 10.
- a plurality of sets of power receiving electrodes 53, terminal members 70, and the like associated with each of the plurality of heating resistors 50 are provided.
- the shape and number of each member constituting the heating device 100 of the above embodiment, the forming material, etc. are merely examples, and various modifications are possible. Further, the method of manufacturing the heating device 100 in the above embodiment is merely an example, and various modifications can be made.
- the technique disclosed in the present specification is a ceramic member formed of a ceramic sintered body containing aluminum nitride as a main component, and a ceramic member.
- the surface of the ceramic member which is provided with a metal heating resistor disposed inside the battery, a conductive power supply connecting member in contact with the heat generating resistor, and a conductive power supply terminal electrically connected to the power supplying connection member. The same can be applied to general holding devices that hold an object thereon.
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Abstract
Description
A-1.加熱装置100の構成:
図1は、本実施形態における加熱装置100の外観構成を概略的に示す斜視図であり、図2は、本実施形態における加熱装置100のXZ断面構成を概略的に示す説明図であり、図3は、図2のX1部における加熱装置100のXZ断面構成を拡大して示す説明図である。各図には、方向を特定するための互いに直交するXYZ軸が示されている。本明細書では、便宜的に、Z軸正方向を上方向といい、Z軸負方向を下方向というものとするが、加熱装置100は実際にはそのような向きとは異なる向きで設置されてもよい。
次に、受電電極53および発熱抵抗体50の周辺の詳細構成について、図3を参照して説明する。
本実施形態の加熱装置100の製造方法は、例えば以下の通りである。図4は、本実施形態の加熱装置100の製造方法の一例を示すフローチャートである。まず、金属(例えば、タングステンやモリブデン)のメッシュや箔からなる発熱抵抗体50を準備し、発熱抵抗体50の表面の内、受電電極53との接触面を除く表面の少なくとも一部(本実施形態では、受電電極53との接触面を除く表面の大部分)に、AlとTiとZrとVとTaとNbとの少なくとも1つを含有する窒化物である第3のコート層63を形成する(S110)。なお、第3のコート層63は、例えば、発熱抵抗体50の表面における第3のコート層63の非形成領域にマスクをして、溶射、スパッタリング、CVD、PVD等を行うことにより形成する。
以上説明したように、本実施形態の加熱装置100は、保持面S1を有し、窒化アルミニウムを主成分とするセラミックス焼結体により形成された保持部材10と、保持部材10の内部に配置された金属製の発熱抵抗体50と、発熱抵抗体50と接する導電性の受電電極53と、受電電極53と電気的に接続された導電性の端子部材70とを備え、保持部材10の保持面S1上に半導体ウェハWといった対象物を保持する保持装置である。本実施形態の加熱装置100では、受電電極53の表面の内、発熱抵抗体50との接触面と端子部材70との接続面とを除く表面の少なくとも一部が、AlとTiとZrとVとTaとNbとの少なくとも1つを含有する窒化物により形成された第2のコート層62に覆われている。
A-5-1.第1のコート層61の厚さt1の特定方法:
受電電極53の表面に形成された第1のコート層61の厚さt1の特定方法は、以下の通りである。
第2のコート層62がAlNにより形成されている場合(すなわち、第2のコート層62が保持部材10と同一材料により形成されている場合)において、受電電極53がAlNの第2のコート層62により覆われていることは、以下のように特定することができる。
(1)視野を100μm×100μmとし、受電電極53と保持部材10との界面を含むもの
(2)視野を1mm×1mmとし、受電電極53と保持部材10との界面を含むもの
下記の2つの要件を満たす時、受電電極53はAlNの第2のコート層62により覆われているものと判断する。
・要件1:上記(1)における、受電電極53と保持部材10との界面の気孔径と気孔数を観察したとき、10個の視野画像において、0.5μm以上、3μm以下の気孔が平均2個以上存在し、かつ、保持部材10と受電電極53とに含有されない成分の元素拡散がない。
・要件2:上記(2)における粒界相成分の分布を観察したとき、10個の視野画像の内、少なくとも5個以上で受電電極53と保持部材10との界面近傍(界面から距離100μm以内の範囲)に粒界相成分が少ない領域が存在しない。
通常、WやMo等の金属表面酸化物とAlN粒子表面の酸化物は、低温で液相を生成し、緻密化するため、界面に気孔が生じにくい。また、焼結が進行するとAlNの粒界相成分は未焼結部に向かって排出されるため、粒界相成分の濃度差が生じる。一方、表面にAlNにより形成された第2のコート層62が存在する場合、金属表面酸化物と保持部材10のAlN粒子表面の酸化物との反応による、低温での液相生成反応が生じないため、界面気孔が残りやすい。また、界面近傍とそれ以外の箇所で焼結挙動の差が生じにくい為、粒界相成分の濃度差も生じにくい。そのため、上記2つの要件を満たせば、受電電極53はAlNの第2のコート層62により覆われていると判断することができる。
上述した加熱装置100の構成を採用することによって上述した効果が得られる点について、性能評価を行った。以下、該性能評価について説明する。図5および図6は、性能評価結果を示す説明図である。
本明細書で開示される技術は、上述の実施形態に限られるものではなく、その要旨を逸脱しない範囲において種々の形態に変形することができ、例えば次のような変形も可能である。
Claims (5)
- 第1の表面を有し、窒化アルミニウムを主成分とするセラミックス焼結体により形成されたセラミックス部材と、
前記セラミックス部材の内部に配置された金属製の発熱抵抗体と、
前記発熱抵抗体と接する導電性の給電接続部材と、
前記給電接続部材と電気的に接続された導電性の給電端子と、
を備え、前記セラミックス部材の前記第1の表面上に対象物を保持する保持装置において、 前記給電接続部材の表面の内、前記発熱抵抗体との接触面と前記給電端子との接続面とを除く表面の少なくとも一部が、AlとTiとZrとVとTaとNbとの少なくとも1つを含有する窒化物により形成された第2のコート層に覆われている、
ことを特徴とする保持装置。 - 請求項1に記載の保持装置において、
前記給電接続部材の表面の内、前記発熱抵抗体との接触面の少なくとも一部が、TiとZrとVとCrとTaとNbとの少なくとも1つを含有する窒化物により形成された第1のコート層に覆われている、
ことを特徴とする保持装置。 - 請求項2に記載の保持装置において、
前記第1のコート層の厚さは、0.3μm以上、60μm以下である、
ことを特徴とする保持装置。 - 請求項1から請求項3までのいずれか一項に記載の保持装置において、
前記発熱抵抗体の表面の内、前記給電接続部材との接触面を除く表面の少なくとも一部が、AlとTiとZrとVとTaとNbとの少なくとも1つを含有する窒化物により形成された第3のコート層に覆われている、
ことを特徴とする保持装置。 - 第1の表面を有し、窒化アルミニウムを主成分とするセラミックス焼結体により形成されたセラミックス部材と、前記セラミックス部材の内部に配置された金属製の発熱抵抗体と、前記発熱抵抗体と接する導電性の給電接続部材と、前記給電接続部材と電気的に接続された導電性の給電端子と、を備え、前記セラミックス部材の前記第1の表面上に対象物を保持する保持装置の製造方法において、
前記給電接続部材の表面の内、前記発熱抵抗体との接触面と前記給電端子との接続面とを除く表面の少なくとも一部に、AlとTiとZrとVとTaとNbとの少なくとも1つを含有する窒化物であるコート層を形成する工程と、
前記発熱抵抗体と前記コート層が形成された前記給電接続部材とが内部に配置された前記セラミックス部材を焼成により作製する工程と、
を備えることを特徴とする保持装置の製造方法。
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