WO2022244266A1 - 半導体装置の製造方法、及び、半導体装置 - Google Patents
半導体装置の製造方法、及び、半導体装置 Download PDFInfo
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Definitions
- the present disclosure relates to a method for manufacturing a semiconductor device, including a method for laminating wiring layers, and a semiconductor device. More particularly, the present invention relates to a semiconductor device manufacturing method and a semiconductor device that are useful for efficiently manufacturing a semiconductor device with high demands for miniaturization and high density at low cost.
- Patent Document 1 discloses a configuration in which chips with different performance are mounted together in one package for the purpose of increasing the density and performance of a semiconductor package. In this form, cost-effective, high-density interconnect technology between chips becomes important.
- Patent Document 4 a method of manufacturing a solid-state imaging device by stacking semiconductor chips having different functions by CuCu bonding has been proposed (see Patent Document 4, for example).
- Non-Patent Document 1 it has been proposed to stack semiconductor chips on a build-up substrate, a wafer level package substrate, a fan-out type package substrate, an interposer substrate, and the like.
- the wiring width is expanded through a plurality of rewiring layers, bumps or pads are formed on the wiring, and the solder is melted by heating and/or pressure to stack the semiconductor chips. is being studied (see, for example, Non-Patent Document 1).
- the present disclosure has been made in order to solve the above-described problems. It is an object of the present invention to provide a method for manufacturing a semiconductor device, and a semiconductor device, by which a semiconductor device having wiring layers of high density can be manufactured with a high yield.
- the present disclosure relates to a method of manufacturing a semiconductor device.
- This manufacturing method includes steps of forming a first organic insulating layer having a groove on a substrate, and forming a conductive layer made of a conductive material on the first organic insulating layer so as to fill the groove with the conductive material. and a first wiring structure having a first wiring layer including a conductive material filled in the trench by removing a portion of the conductive layer on the first organic insulating layer, and the first organic insulating layer. and a second wiring having a second wiring layer including a second organic insulating layer and a conductive material exposed from the surface and filled in a groove provided in the second organic insulating layer.
- a step of providing a structure and a step of aligning the first wiring layer and the second wiring layer so that they correspond to each other, and pressing and laminating the first wiring structure and the second wiring structure, and a stacking step in which each wiring of the first wiring layer and each wiring of the second wiring layer are joined, and the first organic insulating layer and the second organic insulating layer are joined.
- the wiring layer of the semiconductor device is formed by joining the first wiring layer and the second wiring layer formed by filling the groove with the conductive material.
- semiconductor devices having fine and high-density wiring layers can be manufactured with a high yield.
- a second barrier metal film is provided on at least the side surfaces of the trench of the second organic insulating layer, similarly to the first organic insulating layer. Further, in the stacking step, the first barrier metal film on the side surface of the trench of the first organic insulating layer and the second barrier metal film on the side surface of the trench of the second organic insulating layer are misaligned in the direction crossing the side surface. is preferably 50% or less of the thickness of the first barrier metal film.
- the first barrier metal film and the second barrier metal film allow a conductive material (for example, copper) can be prevented from diffusing more reliably, and in particular, it is possible to prevent the diffusion of a conductive material from the junction between the first barrier metal film and the second barrier metal film.
- a conductive material for example, copper
- the surface roughness of the first wiring layer of the first wiring structure is 0.05 ⁇ m or less on the first organic insulating layer. may be removed by polishing. In this case, the bonding between the first wiring layer and the second wiring layer can be performed more reliably, and the wiring layers in the semiconductor device can function more appropriately.
- the surface roughness of the second wiring layer of the second wiring structure may be 0.05 ⁇ m or less. In this case, the bonding between the first wiring layer and the second wiring layer can be performed more reliably, and the wiring layers in the semiconductor device can function more appropriately.
- the melt viscosity at 250° C. of the organic material constituting at least one of the first organic insulating layer and the second organic insulating layer is 1 kPa ⁇ s or more and 1 MPa ⁇ s or less. good. In this case, it is possible to more reliably bond the first organic insulating layer and the second organic insulating layer. More specifically, when the melt viscosity of the organic insulating material is less than 1 kPa ⁇ s, the ductility of the organic insulating layer prevents the first wiring layer from being removed when the portion of the conductive layer on the first organic insulating layer is removed.
- the melt viscosity of the organic insulating material is set to 1 kPa ⁇ s or more.
- the melt viscosity of the organic insulating material is higher than 1 MPa s, it is necessary to raise the heating temperature when bonding the organic insulating layers, which may reduce productivity.
- the melt viscosity of the insulating material is 1 MPa ⁇ s or less, the temperature at which the organic insulating layers are bonded can be reduced, and the productivity can be improved accordingly.
- the melt viscosity at 250° C. of the material constituting at least one of the first organic insulating layer and the second organic insulating layer is preferably 3 kPa ⁇ s or more.
- the melt viscosity at 250° C. of the organic material constituting at least one (preferably both) of the first organic insulating layer and the second organic insulating layer is more preferably 5 kPa ⁇ s or more and 0.5 MPa ⁇ s or less. is.
- the conductive layer may be removed by polishing.
- the conductive layer due to the difference in the coefficient of thermal expansion between the organic resin material forming the organic insulating layer and the metal material forming the wiring layer, it is difficult to bond the first wiring structure and the second wiring structure together. By suppressing the formation of unevenness on the surface, it is possible to stack the first wiring structure and the second wiring structure more reliably.
- the step of forming the first organic insulating layer may include the step of forming a groove on the first organic insulating layer.
- the photosensitive material is placed on the substrate, and the photosensitive material is exposed and developed to form a first organic insulating layer having grooves, finer grooves, that is, each wiring of the first wiring layer is produced. This makes it possible to promote miniaturization and higher density of wiring layers.
- the line width of each wiring of the first wiring layer may be 2 ⁇ m or less, and the thickness of each wiring of the first wiring layer may be 1 ⁇ m or less. In this case, it is possible to form a finer and denser wiring layer.
- the first semiconductor element may be arranged on the surface of the substrate on the side opposite to the first organic insulating layer in the first wiring structure, or in the substrate.
- a second semiconductor element may be arranged on the second organic insulating layer and on the side opposite to the second wiring layer in the body or in the second organic insulating layer, and the first wiring layer and the second wiring layer
- the first semiconductor element may be electrically connected to the second semiconductor element by the wiring layer to which the are bonded. In this case, it is possible to directly or substantially directly connect the first semiconductor element and the second semiconductor element by a fine wiring layer.
- the semiconductor element referred to here can include at least a semiconductor chip and a semiconductor wafer.
- This semiconductor device includes a first wiring structure including a substrate, a first organic insulating layer provided on the substrate and having a first groove, and a first wiring layer composed of a conductive material filled in the first groove. and a second wiring structure including a second organic insulating layer having a second groove, and a second wiring layer composed of a conductive material filled in the second groove.
- the first wiring structure is laminated on the second wiring structure such that the first wiring layer and the second wiring layer are bonded together and the first organic insulating layer and the second organic insulating layer are bonded together.
- the wiring layer is formed from the first wiring layer and the second wiring layer, a semiconductor device having fine and high-density wiring layers can be manufactured with a high yield in the same manner as described above. .
- FIG. 1 is a cross-sectional view schematically showing an example of a semiconductor package.
- 2 is a cross-sectional view showing a wiring member in the semiconductor package shown in FIG. 1.
- FIG. (a) to (d) of FIG. 3 are cross-sectional views schematically showing a process of forming a wiring member according to an embodiment of the present disclosure.
- (a) to (d) of FIG. 4 are cross-sectional views schematically showing a process of forming a wiring member according to an embodiment of the present disclosure.
- (a) and (b) of FIG. 5 are cross-sectional views schematically showing a process of forming a wiring member according to an embodiment of the present disclosure.
- FIG. 6 is a cross-sectional view schematically showing a process of forming a wiring member according to an embodiment of the present disclosure.
- the substrate 10 is, for example, a sealing body formed by sealing the semiconductor chips 20C and 20D and the electrodes 11 and 12 with an insulating material 13.
- the semiconductor chips 20C and 20D within the substrate 10 may be connectable to an external device via electrodes exposed from the insulating material 13 .
- the semiconductor chips 20C and 20D function, for example, as conductive paths for electrically connecting the wiring member 30 and an external device to each other.
- the insulating material 13 is, for example, a curable resin having insulating properties.
- the wiring member 30 is an organic substrate that supports a semiconductor chip or the like.
- a substrate manufactured by thermally curing a sealing material, or a substrate in which a chip is sealed or embedded may be used.
- the shape of the wiring member 30 corresponds to the shape of the substrate 10A, which will be described later, and may be wafer-like (substantially circular in plan view) or panel-like (substantially rectangular in plan view).
- the thermal expansion coefficient of the wiring member 30 is preferably, for example, 40 ppm/° C. or less from the viewpoint of suppressing warpage. From the viewpoint of insulation reliability of the wiring member 30, the thermal expansion coefficient is preferably 20 ppm/° C. or less.
- the wiring member 30 is provided on the substrate 10A.
- the substrate 10A is a support that supports the wiring member 30.
- the shape of the substrate 10A in plan view is, for example, circular or rectangular.
- substrate 10 has a diameter of, for example, 200 mm to 450 mm.
- one side of the substrate 10 is, for example, 300 mm to 700 mm.
- the substrate 10A is, for example, a silicon substrate, a glass substrate, or a peelable copper foil.
- the substrate 10A may be, for example, a build-up substrate, a wafer level package substrate, a coreless substrate, a substrate manufactured by thermosetting a sealing material, or a substrate in which a chip is sealed or embedded.
- FIG. 1 illustrates the configuration (substrate 10) in which the semiconductor chips 20C and 20D are embedded in the substrate 10A, the substrate 10A may have other configurations.
- a temporary fixing layer (not shown) for temporarily fixing the substrate 10A and the wiring member 30 may be provided.
- the substrate 10A can be easily separated from the wiring member 30 by removing the temporary fixing layer.
- the peelable copper foil is a laminate in which a support, a release layer, and a copper foil are layered in order.
- the support corresponds to the substrate 10A
- the copper foil corresponds to the material of the part of the copper wiring included in the through wiring 33 .
- the wiring member 30 includes an organic insulating laminate 31 including a plurality of organic insulating layers, a plurality of wirings 32 arranged in the organic insulating laminate 31, and a through wiring 33 passing through the organic insulating laminate 31. and a surface wiring 34 formed on the surface of the organic insulating laminate 31 and its vicinity.
- a wiring layer of the wiring member 30 is formed from the plurality of wirings 32 .
- This wiring layer may include a through wiring 33 and a surface wiring 34 , and the through wiring 33 may be electrically connected to any one of the plurality of wirings 32 .
- the organic insulating laminate 31 includes a first insulating layer 35 (first organic insulating layer), a second insulating layer 36 (first organic insulating layer), a third insulating layer 37 (second organic insulating layer), and a fourth insulating layer 37 (second organic insulating layer).
- An insulating layer 38 (second organic insulating layer) is provided.
- a first insulating layer 35 to a fourth insulating layer 38 are laminated on the substrate 10A in this order.
- the organic insulating laminate 31 has an opening portion H in which a through wiring 33 is provided and a groove portion T in which each wiring 32 is provided.
- the first insulating layer 35 and the second insulating layer 36 have an opening Ha in which a part 33 of the through wiring 33 is provided.
- a plurality of grooves T are provided in the second insulating layer 36 and the third insulating layer 37 so as to be sandwiched between the first insulating layer 35 and the fourth insulating layer 46 .
- Each groove T has a substantially rectangular shape in a cross section along a direction orthogonal to the extending direction of the groove T. As shown in FIG. That is, each groove T has a bottom surface formed by the surface of the first insulating layer 35 , side surfaces extending from the bottom surface to the fourth insulating layer 38 , and a top surface formed by the rear surface of the fourth insulating layer 38 .
- the plurality of grooves T have a predetermined line width L (horizontal width) and space width S. As shown in FIG.
- Each of the line width L and the space width S is, for example, 0.5 ⁇ m to 10 ⁇ m, preferably 0.5 ⁇ m to 5 ⁇ m, more preferably 2 ⁇ m to 5 ⁇ m. From the viewpoint of realizing high-density transmission of the wiring member 30, the line width L is preferably 1 ⁇ m to 5 ⁇ m.
- the line width L and the space width S may be set to be the same as each other, or may be set to be different from each other.
- the line width L corresponds to the width of the groove T in the direction orthogonal to the extending direction of the groove T (the width L in FIG. 2).
- the space width S corresponds to the distance between adjacent grooves T (width S in FIG. 2).
- the depth of the trench T corresponds to, for example, the total thickness of the second insulating layer 36 and the third insulating layer 37 .
- the cross-sectional shape of the groove portion T is not limited to a substantially rectangular shape, and may be another shape (for example, a substantially semicircular shape).
- the surface roughness of the inner surface of each groove T is preferably 0.01 ⁇ m to 0.1 ⁇ m. When this surface roughness is 0.01 ⁇ m or more, the object (conductive material ) and good temperature cycle resistance.
- temperature cycle resistance means resistance to volume change, performance deterioration, breakage, etc. due to temperature change.
- the surface roughness is 0.1 ⁇ m or less, the short circuit of the wiring 32 made of a conductive material tends to be suppressed and the high frequency characteristics of the wiring 32 can be improved.
- the surface roughness of the inner surface of the groove T is calculated, for example, by observing the cross section of the groove T with an electron microscope. The above surface roughness is the arithmetic mean roughness (Ra) specified in JIS B 0601 2001, and all "surface roughness” below shall be referred to as "surface roughness Ra”.
- the storage elastic modulus of the first insulating layer 35, the second insulating layer 36, the third insulating layer 37 and the fourth insulating layer 38 (hereinafter sometimes abbreviated as "each insulating layer 35 to 38") at room temperature is, for example, 500 MPa. ⁇ 1000 GPa.
- the "room temperature” referred to here indicates about 25°C.
- the storage elastic modulus is 500 MPa or more, stretching of the insulating layers 35 to 38 can be suppressed.
- the storage elastic modulus is 10 GPa or less, for example, it is possible to prevent the grinding blade from being damaged, and as a result, it is possible to suppress the surface of the second insulating layer 36 and the like from becoming excessively rough.
- the melt viscosity at 250° C. of the organic material forming each of the insulating layers 35 to 38 is preferably 1 kPa ⁇ s or more and 1 MPa ⁇ s or less. In this case, it is possible to more reliably bond the second insulating layer 36 and the third insulating layer 37 in the manufacturing method described later. More specifically, when the melt viscosity of the organic insulating material is less than 1 kPa ⁇ s, when the conductive layer portion on the second insulating layer 36 is removed, the wiring 32 (32a) is removed due to the ductility of the organic insulating layer. Although there is a possibility of contamination, such contamination can be prevented by setting the melt viscosity of the organic insulating material to 1 kPa ⁇ s or more.
- melt viscosity of the organic insulating material when the melt viscosity of the organic insulating material is higher than 1 MPa ⁇ s, it is necessary to raise the heating temperature when bonding the insulating layers 36 and 37 together, which may reduce productivity. Since the melt viscosity of the organic insulating material is 1 MPa ⁇ s or less, the temperature at which the insulating layers 36 and 37 are bonded can be reduced, and the productivity can be improved accordingly.
- the melt viscosity at 250° C. of the material constituting the second insulating layer 36 and the third insulating layer 37 is preferably 3 kPa ⁇ s or more. In this case, the flow of the resin during bonding is further suppressed. be able to.
- the melt viscosity of the organic insulating material at 250° C. is preferably 5 kPa ⁇ s or more, in which case stress due to cure shrinkage can be suppressed.
- the melt viscosity at 250° C. of the organic material constituting the second insulating layer 36 and the third insulating layer 37 is preferably 0.8 MPa ⁇ s or less, in which case formation of voids after bonding is suppressed. can do.
- the melt viscosity of the organic material at 250° C. is preferably 0.5 MPa ⁇ s or less. In this case, the second insulating layer 36 and the third insulating layer 37 can be bonded at a low temperature. Therefore, the melt viscosity at 250° C. of the organic material forming the second insulating layer 36 and the third insulating layer 37 is more preferably 5 kPa ⁇ s or more and 0.5 MPa ⁇ s or less.
- each insulating layer 35 to 38 is, for example, 0.5 ⁇ m to 10 ⁇ m. Since each insulating layer 35 to 38 has a thickness of 0.5 ⁇ m or more, each insulating layer 35 to 38 contributes to stress relaxation in the organic insulating laminate 31, and the temperature cycle resistance of the organic insulating laminate 31 is improved. can. Since each of the insulating layers 35 to 38 has a thickness of 10 ⁇ m or less, warping of the organic insulating laminate 31 can be suppressed, and wiring can be easily performed, for example, when the second insulating layer 36 or the third insulating layer 37 is ground. etc. can be exposed. From the viewpoint of forming the wiring 32 with a width of 3 ⁇ m or less by performing exposure and development, the thickness of the second insulating layer 36 and the third insulating layer 37 is preferably 7 ⁇ m or less.
- Each insulating layer 35 to 38 may be made of a cured product of a photosensitive resin composition. From the viewpoint of the flatness of these layers and the manufacturing cost, it is preferable to use materials (film-like organic insulating materials) that have been formed into films in advance for forming these layers. In this case, for example, even if the surface roughness of the substrate 10A is 300 ⁇ m or more, a layer with a sufficiently small surface roughness value can be formed. It is preferable that the film-like organic insulating material can be laminated at 40.degree. C. to 120.degree. By setting the temperature at which lamination is possible to 40° C.
- the coefficient of thermal expansion of each of the insulating layers 35 to 38 after curing is, for example, 80 ppm/° C. or less from the viewpoint of suppressing warping of the organic insulating laminate 31 .
- the thermal expansion coefficient of the insulating layers 35 to 38 after curing is preferably 70 ppm/° C. or less.
- the thermal expansion coefficient of the insulating layers 35 to 38 after curing is more preferably 20 ppm/° C. or more.
- Examples of the photosensitive resin composition for forming the insulation layers 35 to 38 include compositions containing at least a photoacid generator and a compound having a tertiary amino group or a nitrogen-containing heterocycle.
- the composition further contains an alkali-soluble resin.
- Such a photosensitive resin composition can be prepared as either a negative type or a positive type.
- the photoacid generator is not particularly limited as long as it is a compound that generates an acid upon irradiation with light. From the viewpoint of efficient acid generation, the photoacid generator is preferably, for example, an onium salt compound or a sulfonimide compound.
- Onium salt compounds include, for example, iodonium salts and sulfonium salts.
- diaryliodonium salts such as diphenyliodonium trifluoromethanesulfonate, diphenyliodonium p-toluenesulfonate, diphenyliodonium hexafluoroantimonate, diphenyliodonium hexafluorophosphate, diphenyliodonium tetrafluoroborate, triphenylsulfonium trifluoromethanesulfonate, tri Phenylsulfonium p-toluenesulfonate, triarylsulfonium salts such as triphenylsulfonium hexafluoroantimonate, 4-tert-butylphenyl-diphenylsulfonium p-toluenesulfonate, 4,7-di-n-butoxynaphthyltetrahydrothiophenium trifluoro and romethane
- sulfonimide compounds include N-(trifluoromethylsulfonyloxy)succinimide, N-(trifluoromethylsulfonyloxy)phthalimide, N-(trifluoromethylsulfonyloxy)diphenylmaleimide, N-(trifluoromethylsulfonyloxy) oxy)bicyclo[2.2.1]hept-5-ene-2,3-dicarboximide, N-(trifluoromethylsulfonyloxy)naphthalimide, N-(p-toluenesulfonyloxy)-1,8- naphthalimide, N-(10-camphorsulfonyloxy)-1,8-naphthalimide and the like.
- a compound having a trifluoromethanesulfonate group, a hexafluoroantimonate group, a hexafluorophosphate group, or a tetrafluoroborate group may be used as the photoacid generator.
- Examples of compounds having a phenolic hydroxyl group include phenol/formaldehyde condensed novolak resins, cresol/formaldehyde condensed novolac resins, phenol-naphthol/formaldehyde condensed novolak resins, polyhydroxystyrene and polymers thereof, phenol-xylylene glycol condensed resins, cresol- Examples include xylylene glycol condensed resins, phenol-dicyclopentadiene condensed resins, and the like.
- the plurality of wirings 32 are provided in the corresponding grooves T as described above and function as conductive paths inside the wiring member 30 . Therefore, the width of the wiring 32 substantially matches the line width L of the trench T, and the interval between adjacent wirings 32 substantially matches the space width S of the trench T. As shown in FIG. From the viewpoint of satisfactorily functioning as a conductive path, the wiring 32 preferably contains a highly conductive metal material. Metallic materials with high electrical conductivity are, for example, copper, aluminum or silver. These metal materials tend to diffuse into the organic insulating laminate 31 when heated. From the viewpoint of conductivity and cost, the metal material included in the wiring 32 is preferably copper.
- the wiring 32 is preferably covered with a barrier metal film 39 for suppressing diffusion of the metal material constituting the wiring 32 into the organic insulating laminate 31 .
- the barrier metal film 39 consists of a first barrier metal film 39a provided between the wiring 32 (wiring 32a) and the first insulating layer 35 and the second insulating layer 36, the wiring 32 (wiring 32b) and the third insulating layer 37. and a second barrier metal film 39b provided between it and the fourth insulating layer 38 (see FIG. 6).
- the first barrier metal film 39 a is provided so as to separate the wiring 32 (wiring 32 a ) from the first insulating layer 35 and the second insulating layer 36 , and blocks part of the side surface and the bottom surface of the wiring 32 .
- the second barrier metal film 39b is provided so as to separate the wiring 32 (wiring 32b) from the third insulating layer 37 and the fourth insulating layer 38, and closes the remaining side surfaces and the top surface of the wiring 32. As shown in FIG.
- the barrier metal film 39 composed of the first barrier metal film 39a and the second barrier metal film 39b is made of a metal material that is difficult to diffuse into the organic insulating layer, such as titanium, nickel, palladium, chromium, tantalum, tungsten, and gold. contains at least one of From the viewpoint of adhesion to the inner surface of the trench T, the barrier metal film 39 is preferably a titanium film or an alloy film containing titanium. From the viewpoint of forming the barrier metal film 39 by sputtering, the barrier metal film 39 is a titanium film, a tantalum film, a tungsten film, a chromium film, or an alloy film containing at least one of titanium, tantalum, tungsten, and chromium. Preferably.
- the surface wiring 34 is wiring for electrically connecting the semiconductor chips 20A and 20B mounted on the wiring member 30, for example. Therefore, both ends of the surface wiring 34 are exposed from the wiring member 30, and the surface wiring 34 other than the both ends is embedded in the wiring member 30 (more specifically, the fourth insulating layer 38). there is therefore, the fourth insulating layer 38 may include two or more organic insulating layers. Note that the surface wiring 34 may not be formed.
- the manufacturing method according to the present embodiment includes (A) a step of forming a first organic insulating layer having a groove on a substrate, and (B) a first barrier layer formed on the bottom and side surfaces of the groove of the first organic insulating layer. (C) forming a conductive layer made of a conductive material on the first organic insulating layer so as to fill the groove with the conductive material; and (D) on the first organic insulating layer.
- a metal layer 33a is formed on the substrate 10A.
- the metal layer 33a is formed by patterning a metal film formed on the substrate 10A.
- the metal layer 33a is formed by, for example, a coating method, a physical vapor deposition method (PVD method) such as vacuum deposition or sputtering, a printing method or a spray method using a metal paste, or various plating methods.
- PVD method physical vapor deposition method
- a copper foil can be used as the metal film.
- the metal layer 33 a constitutes a portion (lower portion) of the through wiring 33 .
- the temporary fixing layer is made of, for example, polyimide, polybenzoxazole, silicon, a resin containing a non-polar component such as fluorine, or heated. Alternatively, it contains a resin containing a component that expands or foams in volume by UV (ultraviolet rays), a resin containing a component that undergoes a cross-linking reaction by heating or by UV, or a resin that generates heat when irradiated with light.
- Methods for forming the temporary fixing layer include, for example, spin coating, spray coating, and lamination.
- the temporary fixing layer be easily peeled off by an external stimulus such as light or heat. From the viewpoint that the temporary fixing layer can be peeled off so as not to remain on the wiring member 30 to be manufactured later, the temporary fixing layer most preferably contains a resin that expands in volume by heat treatment.
- the metal layer 33a may be made of peelable copper foil.
- the substrate 10A corresponds to the support of the peelable copper foil
- the temporary fixing layer corresponds to the release layer of the peelable copper foil.
- a first photosensitive resin layer 35A made of a negative photosensitive resin composition is formed on the substrate 10A so as to cover the metal layer 33a.
- a photomask is placed on the first photosensitive resin layer 35A, and the first photosensitive resin layer 35A is exposed except for the area that will become the opening H.
- a photomask is placed on the first photosensitive resin layer 35A, and the first photosensitive resin layer 35A is exposed except for the area that will become the opening H.
- an exposed portion 35a and an unexposed portion 35b are formed in the first photosensitive resin layer 35A.
- a known projection exposure method, contact exposure method, direct drawing exposure method, or the like can be used as a known projection exposure method, contact exposure method, direct drawing exposure method, or the like.
- a second photosensitive resin layer 36A is formed on the surface of the first photosensitive resin layer 35A after exposure processing.
- the thickness of the second photosensitive resin layer 36A is, for example, 7 ⁇ m or less.
- a photomask is placed on the second photosensitive resin layer 36A, and the second photosensitive resin layer 36A is exposed except for the regions that will become the openings H and the grooves T.
- an exposed portion 36a and an unexposed portion 36b are formed in the second photosensitive resin layer 36A.
- a known projection exposure method, contact exposure method, direct drawing exposure method, or the like can be used as a method for exposing the second photosensitive resin layer 36A.
- the first photosensitive resin layer 35A and the second photosensitive resin layer 36A are formed as shown in FIG.
- An opening portion Ha is formed through the photosensitive resin layer 36A, and a groove portion Ta (first groove portion) whose bottom surface is the surface of the first photosensitive resin layer 35A is formed in the second photosensitive resin layer 36A.
- an alkaline aqueous solution such as sodium carbonate or TMAH
- an organic solvent such as PGMEA, PGME, or cyclopentanone
- the developed first photosensitive resin layer 35A and the second photosensitive resin layer 36A are cured by heating.
- the heating temperature is set to 100 to 200° C.
- the heating time is set to 30 minutes to 3 hours.
- the first photosensitive resin layer 35A and the second photosensitive resin layer 36A become the first insulating layer 35 and the second insulating layer 36, as shown in (c) of FIG.
- the first barrier metal film is formed by applying a paste containing metal particles such as nickel or palladium to the surface of the second insulating layer 36 and the inner surfaces of the opening Ha and the groove Ta, followed by sintering. Form 39a.
- a metal layer 32A is formed on the first barrier metal film 39a so as to fill the opening Ha and the trench Ta.
- the metal layer 32A is formed by, for example, a method using a metal paste or a plating method using the first barrier metal film 39a as a seed layer.
- the thickness of the metal layer 32A is preferably 0.5 to 3 times the total thickness of the first insulating layer 35 and the second insulating layer 36 .
- the thickness of the metal layer 32A is three times or less, the metal layer 32A tends to be less warped and adheres well to the second insulating layer 36 .
- the second insulating layer 36 is exposed by removing the metal layer 32A and the first barrier metal film 39a on the second insulating layer 36. Then, as shown in FIG. As a result, the wiring 33A is formed by filling the metal in the opening Ha. Further, the wiring 32a is formed by filling the trench Ta with a metal that is a conductive material. After removing the metal layer 32A and the first barrier metal film 39a, the surface of the second insulating layer 36 may be planarized. In this case, CMP or fly-cut method may be adopted.
- the slurry contains, for example, a slurry containing alumina, which is generally used for polishing resin, and hydrogen peroxide and silica, which are used for polishing the first barrier metal film 39a.
- a slurry and a slurry containing hydrogen peroxide and ammonium persulfate used for polishing the metal layer 32A can be used. From the viewpoint of reducing the cost and controlling the surface roughness Ra of the second insulating layer 36 and the wirings 32a and 33A to 0.01 ⁇ m to 1 ⁇ m (more preferably 0.05 ⁇ m or less), a slurry containing alumina is used.
- the second insulating layer 36, the first barrier metal film 39a, the metal layer 32A (wiring 32a), and the wiring 33A It is preferable to grind the second insulating layer 36, the first barrier metal film 39a, the metal layer 32A (wiring 32a), and the wiring 33A. Further, when the second insulating layer 36, the first barrier metal film 39a and the metal layer 32A (wirings 32a and 33A) are planarized at the same time, dishing occurs in the wirings 32a and 33A due to the difference in the polishing rate, resulting in the second insulating layer 36a and 32A. The flatness of the surface including the layer 36 and the wiring 32a33A tends to be greatly impaired.
- the multilayered first wiring structure 30A shown in FIG. 5(b) can be formed on the substrate 10A.
- the first wiring structure 30A shown in FIG. 5(b) can be manufactured by a simpler process than conventional wiring layers having a multi-layer structure.
- the second wiring structure 30B is first formed by the same process as the first wiring structure 30A formed by the process described above.
- the second wiring structure 30B includes, for example, a third insulating layer 37, a fourth insulating layer 38, a wiring 32b that is the remainder of the wiring 32, a wiring 33B that is the remainder of the through wiring 33, a surface wiring 34, and a second barrier metal film. 39b.
- the wiring 32b and the second barrier metal film 39b (second barrier metal film) are formed in the trench Tb.
- the second wiring structure 30B may be manufactured by the same manufacturing process as that of the first wiring structure 30A described above, or may be manufactured by another process.
- the third insulating layer 37 and the fourth insulating layer 38 may be made of the same material as the first insulating layer 35 and the second insulating layer 36, as described above, and the wirings 32b and 33B are the wirings 32a and 32a. It may be constructed from a material similar to 33A.
- a wiring layer (second wiring layer) in the second wiring structure 30B is formed from the plurality of wirings 32b. This wiring layer may include the wiring 33B and the surface wiring 34 .
- the second wiring structure 30B may or may not have a substrate corresponding to the substrate 10A, or may have it during fabrication and may be peeled off in the middle. Also, in the second wiring structure 30B, a semiconductor chip or the like may be mounted on the surface of the fourth insulating layer 38 opposite to the surface of the third insulating layer 37 (or in the fourth insulating layer 38).
- each wiring 32a formed on the surface side of the first wiring structure 30A and the wirings 32a formed on the surface side of the second wiring structure 30B are formed. Alignment is performed so that the wirings 32b thus formed correspond to each other, and the wirings 33A of the first wiring structure 30A and the wirings 33B of the second wiring structure 30B are also aligned.
- the second wiring structure 30B is moved relatively toward the first wiring structure 30A, and laminated while being pressed. During this lamination, the first wiring structure 30A and the second wiring structure 30B may be laminated while being heated and pressurized.
- the heating temperature in this case is, for example, 25°C to 300°C.
- the wirings 32a of the first wiring structure 30A and the wirings 32b of the second wiring structure 30B are joined to form the wirings 32, and the wirings 33A of the first wiring structure 30A are connected.
- Each wiring 33B of the second wiring structure 30B is joined to form the through wiring 33 .
- the first barrier metal film 39a positioned outside each wiring 32a and the second barrier metal film 39b positioned outside each wiring 32b are also aligned and joined together to form the barrier metal film 39.
- Each barrier metal film 39 covers the entire outer side of each wiring 32 and prevents the material forming the wiring 32 from diffusing into the organic insulating layer.
- wiring is performed so that the horizontal positional displacement when bonding the first barrier metal film 39a and the second barrier metal film 39b is 50% or less of the thickness of the barrier metal film 39. It is preferable to align the wiring 32a with the wiring 32b. Also, during this joining, the second insulating layer 36 of the first wiring structure 30A and the third insulating layer 37 of the second wiring structure 30B are joined. The wiring member 30 shown in FIG. 2 is formed by bonding the second insulating layer 36 and the third insulating layer 37 together.
- the wiring layer of the semiconductor package 1 is formed by joining the wirings 32a and 32b formed by filling the grooves Ta and Tb with the conductive material. forming In this case, the semiconductor package 1 having fine and high-density wiring layers can be manufactured with a high yield.
- the first barrier metal film 39a is formed on the bottom and side surfaces of the groove Ta of the first insulating layer 35 and the second insulating layer 36 before forming the conductive layer.
- the conductive material for example, copper
- the thickness of the first barrier metal film 39a may be 0.001 ⁇ m or more and 0.5 ⁇ m or less. In this case, diffusion of the conductive material into the organic insulating layer can be more reliably prevented.
- the cross-sectional area of each wiring 32 can be sufficiently secured.
- the second barrier metal film 39b is provided on the side and bottom surfaces of the groove portion Tb (second groove portion) of the third insulating layer 37 and the fourth insulating layer 38. .
- the wiring 32a and the wiring 32a are arranged such that the horizontal positional displacement between the first barrier metal film 39a and the second barrier metal film 39b is 50% or less of the thickness of the first barrier metal film 39a. It is preferable to align with the wiring 32b.
- the first barrier metal film 39a and the second barrier metal film 39b can more reliably prevent diffusion of a conductive material (for example, copper) that can diffuse from the wiring 32 to the organic insulating laminate 31 outside. In particular, it is possible to prevent diffusion of the conductive material from the junction between the first barrier metal film 39a and the second barrier metal film 39b.
- the surface roughness of the wiring 32a of the first wiring structure 30A is set to 0.05 ⁇ m or less. 2
- the portion of the conductive layer on the insulating layer 36 may be removed by polishing.
- the surface roughness of the wiring 32b of the second wiring structure 30B may be similarly polished. In this case, the wiring 32a and the wiring 32b can be joined more reliably, and the wiring 32 in the semiconductor device can function more appropriately.
- the melt viscosity at 250° C. of the organic material forming each of the insulating layers 35 to 38 may be 1 kPa ⁇ s or more and 1 MPa ⁇ s or less.
- the bonding between the second insulating layer 36 and the third insulating layer 37 can be performed more reliably. More specifically, when the melt viscosity of the organic insulating material is less than 1 kPa ⁇ s, the ductility of the organic insulating layer contaminates the wiring 32a when the conductive layer portion on the second insulating layer 36 is removed. However, such contamination can be prevented by setting the melt viscosity of the organic insulating material to 1 kPa ⁇ s or more.
- the melt viscosity of the organic insulating material when the melt viscosity of the organic insulating material is higher than 1 MPa s, it is necessary to raise the heating temperature when bonding the organic insulating layers, which may reduce productivity.
- the melt viscosity of the insulating material is 1 MPa ⁇ s or less, the temperature at which the organic insulating layers are bonded can be reduced, and the productivity can be improved accordingly.
- the melt viscosity at 250° C. of the material forming each of the insulating layers 35 to 38 is preferably 3 kPa ⁇ s or more. In this case, the flow of the resin during bonding can be further suppressed. Furthermore, the melt viscosity of the organic insulating material at 250° C.
- the melt viscosity at 250° C. of the organic material forming each of the insulating layers 35 to 38 is preferably 0.8 MPa ⁇ s or less, in which case the formation of voids after bonding can be suppressed. Furthermore, the melt viscosity of the organic material at 250° C. is preferably 0.5 MPa ⁇ s or less. In this case, the second insulating layer 36 and the third insulating layer 37 can be bonded at a low temperature. Therefore, the melt viscosity at 250° C. of the organic material forming each of the insulating layers 35 to 38 is more preferably 5 kPa ⁇ s or more and 0.5 MPa ⁇ s or less.
- the conductive layer on the second insulating layer 36 is removed by polishing so that the surface of the wiring 32a protrudes from the surface of the second insulating layer 36. good too.
- the conductive layer on the third insulating layer 37 may be removed by polishing so that the surface of the wiring 32b protrudes from the surface of the third insulating layer 37.
- a photosensitive material is arranged on the substrate 10A, and the photosensitive material is exposed and developed to form the first insulating layer 35 and the second insulating layer 36.
- the insulating layer itself, the grooves, etc. can be easily formed, and the manufacturing efficiency can be improved.
- the line width of each wiring 32a, 32b may be 2 ⁇ m or less, and the thickness of each wiring 32a, 32b may be 1 ⁇ m or less. In this case, it is possible to form a finer and denser wiring layer. can be connected almost directly.
- the present disclosure is not limited to the above-described embodiments, and modifications may be made as appropriate without departing from the scope of the present disclosure.
- the wiring member 30 may be used to connect the semiconductor chip and the semiconductor wafer, or to connect the semiconductor wafers. You may Other connections may be used.
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Abstract
Description
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Claims (15)
- 溝部を有する第1有機絶縁層を基板上に形成する工程と、
前記溝部に導電性材料を充填するように前記第1有機絶縁層上に前記導電性材料からなる導電層を形成する工程と、
前記第1有機絶縁層上の前記導電層の部分を除去し、前記溝部内に充填された前記導電性材料を含んで構成される第1配線層と前記第1有機絶縁層とを有する第1配線構造体を取得する工程と、
第2有機絶縁層と、前記第2有機絶縁層に設けられた溝部に充填されて表面から露出する導電性材料を含んで構成される第2配線層とを有する第2配線構造体を提供する工程と、
前記第1配線層と前記第2配線層とが対応するように位置合わせを行うと共に前記第1配線構造体と前記第2配線構造体とを加圧して積層する工程であって、前記第1配線層の各配線と前記第2配線層の各配線とが接合されると共に前記第1有機絶縁層と前記第2有機絶縁層とが接合される、積層する工程と、
を備える、半導体装置の製造方法。 - 前記導電層を形成する前に、前記第1有機絶縁層の前記溝部の底面及び側面の少なくとも一方の面上に第1バリア金属膜を形成する工程を更に備える、
請求項1に記載の半導体装置の製造方法。 - 前記第1バリア金属膜の厚みは、0.001μm以上で且つ0.5μm以下である、
請求項2に記載の半導体装置の製造方法。 - 前記第1バリア金属膜の厚みは、前記第1有機絶縁層の前記溝部の横幅の半分未満又は前記溝部の深さの半分未満である、
請求項2又は3に記載の半導体装置の製造方法。 - 前記第2有機絶縁層の前記溝部の少なくとも側面上には第2バリア金属膜が設けられており、
前記積層する工程では、前記第1有機絶縁層の前記溝部の前記側面上の前記第1バリア金属膜と、前記第2有機絶縁層の前記溝部の前記側面上の前記第2バリア金属膜との前記側面に交差する方向の位置ズレが、前記第1バリア金属膜の厚みに対して50%以下となるように、前記第1配線層と前記第2配線層との位置合わせを行う、
請求項2~4の何れか1項に記載の半導体装置の製造方法。 - 前記第1配線構造体を取得する工程では、前記第1配線構造体の前記第1配線層の表面粗さが0.05μm以下となるように、前記第1有機絶縁層上の前記導電層の部分を研磨により除去する、
請求項1~5の何れか1項に記載の半導体装置の製造方法。 - 前記第2配線構造体の前記第2配線層の表面粗さが0.05μm以下である、
請求項1~6の何れか1項に記載の半導体装置の製造方法。 - 前記第1有機絶縁層及び前記第2有機絶縁層の少なくとも一方を構成する有機材料の250℃における溶融粘度は、1kPa・s以上で且つ1MPa・s以下である、
請求項1~7の何れか1項に記載の半導体装置の製造方法。 - 前記第1配線構造体を取得する工程では、前記第1配線層の表面が前記第1有機絶縁層の表面よりも突出した状態となるように前記第1有機絶縁層上の前記導電層を研磨により除去する、
請求項1~8の何れか1項に記載の半導体装置の製造方法。 - 前記第1有機絶縁層を形成する工程は、前記基板上に感光性材料を配置し、前記感光性材料を露光及び現像して前記第1有機絶縁層を形成する工程を含む、
請求項1~9の何れか1項に記載の半導体装置の製造方法。 - 前記第1有機絶縁層を形成する工程は、前記第1有機絶縁層上に前記溝部を形成する工程を含む、
請求項1~10の何れか1項に記載の半導体装置の製造方法。 - 前記第1配線層の各配線のライン幅は2μm以下であり、
前記第1配線層の各配線の厚みは1μm以下である、
請求項1~11の何れか1項に記載の半導体装置の製造方法。 - 前記第1配線構造体において前記基板上であって前記第1有機絶縁層とは逆側の面又は前記基板内に第1半導体素子が配置されており、
前記第2配線構造体において前記第2有機絶縁層上であって前記第2配線層とは逆側の面又は前記第2有機絶縁層内に第2半導体素子が配置されており、
前記第1配線層と前記第2配線層とが接合された配線層によって、前記第1半導体素子が前記第2半導体素子に電気的に接続される、
請求項1~12の何れか1項に記載の半導体装置の製造方法。 - 基板、前記基板上に設けられ第1溝部を有する第1有機絶縁層、及び、前記第1溝部内に充填された導電性材料から構成される第1配線層を含む第1配線構造体と、
第2溝部を有する第2有機絶縁層、及び、前記第2溝部内に充填された導電性材料から構成される第2配線層を含む第2配線構造体と、
を備え、
前記第1配線構造体は、前記第1配線層と前記第2配線層とが接合され且つ前記第1有機絶縁層と前記第2有機絶縁層とが接合されるように、前記第2配線構造体上に積層されている、半導体装置。 - 前記第1配線構造体において前記基板上であって前記第1有機絶縁層とは逆側の面又は前記基板内に配置される第1半導体素子と、
前記第2配線構造体において前記第2有機絶縁層上であって前記第2配線層とは逆側の面又は前記第2有機絶縁層内に配置される第2半導体素子と、
を更に備え、
前記第1配線層と前記第2配線層とが接合された配線層によって、前記第1半導体素子が前記第2半導体素子に電気的に接続される、
請求項14に記載の半導体装置。
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