WO2020129885A1 - 半導体封止用成形材料、半導体封止用成形材料の製造方法及びそれを用いた半導体装置 - Google Patents
半導体封止用成形材料、半導体封止用成形材料の製造方法及びそれを用いた半導体装置 Download PDFInfo
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- WO2020129885A1 WO2020129885A1 PCT/JP2019/049133 JP2019049133W WO2020129885A1 WO 2020129885 A1 WO2020129885 A1 WO 2020129885A1 JP 2019049133 W JP2019049133 W JP 2019049133W WO 2020129885 A1 WO2020129885 A1 WO 2020129885A1
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- Prior art keywords
- crushing
- rolling
- sheet
- cooling
- molding material
- Prior art date
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Classifications
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- C—CHEMISTRY; METALLURGY
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
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- C08J3/12—Powdering or granulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
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- C—CHEMISTRY; METALLURGY
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
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- H—ELECTRICITY
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- H01L23/29—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the material, e.g. carbon
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/28—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection
- H01L23/29—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the material, e.g. carbon
- H01L23/293—Organic, e.g. plastic
- H01L23/295—Organic, e.g. plastic containing a filler
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/28—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection
- H01L23/31—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/04—Disintegrating plastics, e.g. by milling
- B29B2017/0424—Specific disintegrating techniques; devices therefor
- B29B2017/0468—Crushing, i.e. disintegrating into small particles
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2363/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Definitions
- the present disclosure relates to a semiconductor encapsulating molding material, a method for manufacturing the same, and a semiconductor device using the semiconductor encapsulating molding material.
- the molding material for semiconductor encapsulation is a thermosetting resin such as an epoxy resin which is excellent in electrical characteristics, heat resistance, mass productivity, etc., and its curing agent, catalyst, release agent, flame retardant, coloring agent, and other additives. And an inorganic filler.
- a method for producing the same after kneading by kneading with a roll, a single-screw extruder, a combination of a single-screw extruder and a roll, or a twin-screw extruder after mixing and mixing predetermined amounts of components constituting the resin composition.
- the product is rolled into a sheet, cooled, crushed using an impact crusher, and processed into a powdery or tablet form as required.
- Patent Document 1 discloses a method for grinding a molded package to reduce the thickness of the package.
- Patent Document 2 discloses a sealing technique capable of forming a package with a narrow gap structure in which the resin thickness on the chip is thin, with good yield without causing defects such as wire flow or defective filling.
- the present disclosure has been made in view of the above circumstances.
- a molding material for semiconductor encapsulation a method of manufacturing the same, and a method for manufacturing the same, which can make the appearance and reliability of a semiconductor device excellent even if the resin thickness on the chip of the semiconductor package is reduced to 100 ⁇ m or less. It is to provide a semiconductor device using a molding material for sealing.
- a molding compound for semiconductor encapsulation having a content of aggregates and/or gel-like substances with a size of more than 100 ⁇ m of a specific value or less has the above-mentioned characteristics.
- the present disclosure has been completed and the present disclosure has been completed.
- a semiconductor encapsulating molding material having a content of aggregates and/or gel-like substances having a size of more than 100 ⁇ m of 50 ppm or less.
- a mixing step of mixing raw materials containing an epoxy resin, a curing agent and an inorganic filler, a kneading step of kneading the mixture obtained in the mixing step to obtain a kneaded product, and a kneading obtained in the kneading step A rolling step of rolling an article into a sheet-like composition with a rolling roll, a sheet-like composition rolled in the rolling step while being conveyed by a cooling conveyor, a cooling step of cooling in a gas, and a cooling step in the cooling step.
- a method for producing a molding material for semiconductor encapsulation comprising a pulverizing step of pulverizing a sheet composition with a pulverizer, and further comprising a pulverizing/classifying step of pulverizing/classifying an object to be pulverized to a particle size of 100 ⁇ m or less.
- a mixing step of mixing raw materials containing an epoxy resin, a curing agent and an inorganic filler, a kneading step of kneading the mixture obtained in the mixing step to obtain a kneaded product, and a kneading obtained in the kneading step A first rolling step of rolling an article into a sheet composition with a rolling roll, and a first cooling step of cooling the sheet composition rolled in the first rolling step in a gas while being conveyed by a cooling conveyor.
- Step a first crushing step of crushing the sheet-shaped composition cooled in the first cooling step with a crusher, and the crushed product obtained in the first crushing step is crushed and classified to a particle size of 100 ⁇ m or less.
- a crushing/classifying step a second rolling step of rolling the crushed material obtained in the crushing/classifying step into a sheet with a rolling roll, and a cooling conveyor for the sheet-shaped composition rolled in the second rolling step.
- the above [1] having a second cooling step of cooling in a gas while being transported by the above, and a second crushing step of crushing the sheet composition cooled in the second cooling step with a crusher.
- the manufacturing method of the molding material for semiconductor sealing as described in.
- a molding material for semiconductor encapsulation which can make the appearance and reliability of a semiconductor device excellent even when the resin thickness on a chip of a semiconductor package is as thin as 100 ⁇ m or less, and manufacturing thereof.
- a method and a semiconductor device using the molding material for semiconductor encapsulation can be provided.
- Example 3 is a flowchart for explaining the method for manufacturing the molding compound for semiconductor encapsulation of Example 1.
- 5 is a flowchart for explaining a method for manufacturing a molding compound for semiconductor encapsulation of Example 2.
- the semiconductor encapsulating molding material of the present disclosure (hereinafter, also simply referred to as encapsulating molding material) has a content of aggregates and/or gel substances having a size of more than 100 ⁇ m of 50 ppm or less.
- the resin thickness on the chip of the semiconductor package is 100 ⁇ m or less for the above sealing.
- the content of the aggregate and/or gel-like substance having a size of more than 100 ⁇ m contained in the molding material for sealing may be 30 ppm or less, 10 ppm or less, and 0 ppm.
- the aggregates and gel-like substances having a size of more than 100 ⁇ m include aggregates and gel-like substances of inorganic fillers, aggregates and gel-like substances of inorganic fillers and silane coupling agents, heat Examples include a reaction cured product of a curable resin.
- the content of the aggregate and/or gel-like substance having a size of more than 100 ⁇ m contained in the molding material for sealing is, for example, 150 g of a sample is weighed and dispersed in 200 cc of acetone, and the mixture is stirred for 30 minutes and then nominally. It can be determined by filtering using a sieve with a mesh size of 106 ⁇ m, and measuring the weight of the residue of agglomerates and gel-like substances larger than 106 ⁇ m in size.
- the molding material for semiconductor encapsulation of the present disclosure includes an epoxy resin, a curing agent, and an inorganic filler.
- the epoxy resin, the curing agent and the inorganic filler are not particularly limited as long as they are usually used in epoxy resin molding materials for semiconductor encapsulation.
- the epoxy resin used in the present disclosure is not particularly limited as long as it is commonly used for epoxy resin molding materials for semiconductor encapsulation, and examples thereof include phenol novolac type epoxy resin and orthocresol novolac type epoxy resin.
- phenols such as cresol, xylenol, resorcin, catechol, bisphenol A, bisphenol F and/or naphthols such as ⁇ -naphthol, ⁇ -naphthol, dihydroxynaphthalene and formaldehyde, acetaldehyde, propionaldehyde, benzaldehyde, salicylaldehyde Epoxidized novolak resin obtained by condensation or co-condensation with a compound having an aldehyde group such as bisphenol A, bisphenol F, bisphenol S, diglycidyl such as alkyl-substituted or unsubstituted biphenol Glycidyl ether type epoxy resin such as ether, stilbene type epoxy resin, hydro
- the curing agent used in the present disclosure is not particularly limited as long as it is commonly used in epoxy resin molding materials for semiconductor encapsulation, and examples thereof include phenol, cresol, resorcin, catechol, bisphenol A, bisphenol F and phenyl.
- Resins obtained by condensing or co-condensing phenols such as phenol and aminophenol and/or naphthols such as ⁇ -naphthol, ⁇ -naphthol and dihydroxynaphthalene with a compound having an aldehyde group such as formaldehyde under an acidic catalyst
- phenols such as phenol and aminophenol and/or naphthols such as ⁇ -naphthol, ⁇ -naphthol and dihydroxynaphthalene
- aldehyde group such as formaldehyde under an acidic catalyst
- aralkyl type phenol resins such as phenol/aralkyl resins and naphthol/aralkyl resins which are synthesized from phenols and/or naphthols and dimethoxyparaxylene or bis(methoxymethyl)biphenyl. These may be used alone or in combination of two or more.
- the inorganic filler used in the present disclosure is blended in a molding material for sealing in order to reduce hygroscopicity, reduction in linear expansion coefficient, thermal conductivity and strength, and examples thereof include fused silica, crystalline silica, and alumina.
- examples of the flame-retardant inorganic filler include aluminum hydroxide, magnesium hydroxide, zinc borate, zinc molybdate, and the like. These inorganic fillers may be used alone or in combination of two or more. Of these, fused silica may be used from the viewpoint of reducing the linear expansion coefficient, and alumina may be used from the viewpoint of high thermal conductivity. Further, the shape of the inorganic filler may be spherical from the viewpoint of improving fluidity at the time of molding and mold durability.
- the average particle size of the inorganic filler may be 2 to 25 ⁇ m or 3 to 15 ⁇ m from the viewpoint of fluidity and moldability during molding.
- the average particle size of the inorganic filler can be obtained, for example, by a laser diffraction particle size distribution measuring device.
- the average particle size is the particle size (d50) at which the cumulative volume becomes 50% in the particle size distribution measured by the same device.
- the compounding amount of the inorganic filler in the molding compound for semiconductor encapsulation may be in the range of 70 to 97 mass %, 80 to 95 mass %, or 88 to 92 mass %. .. When it is 70 mass% or more, the reflow resistance is improved, and when it is 97 mass% or less, the fluidity is improved.
- the semiconductor encapsulating molding material of the present disclosure may include a curing accelerator, a silane coupling agent, a carbon black, a release agent such as carnauba wax or low molecular weight polyethylene, and a flexibility of the encapsulating molding material, if necessary. Silicone oil, rubber or the like for holding the oil may be appropriately added.
- the method for producing a molding compound for semiconductor encapsulation of the first embodiment of the present disclosure includes a mixing step of mixing raw materials including an epoxy resin, a curing agent, and an inorganic filler.
- the method for producing a molding material further comprises a pulverization/classification step of pulverizing/classifying an object to be pulverized to have a particle size of 100 ⁇ m or less.
- the first embodiment is not particularly limited as long as it has a crushing/classifying step, and the crushing/classifying step may be performed before the mixing step or after the mixing step and before the kneading step. , After the kneading step and before the rolling step, after the rolling step and before the cooling step, after the cooling step and before the crushing step, after the crushing step You can go.
- the crushing/classifying step may be performed in the same process as the crushing step, or may be performed as a step different from the crushing step.
- the crushing/classifying step may be carried out after the kneading step from the viewpoint that the content of the aggregate and/or gel-like substance having a size of more than 100 ⁇ m contained in the obtained molding material for semiconductor encapsulation is 50 ppm or less. ..
- each step will be described in order.
- the mixing step is a step of mixing raw materials containing an epoxy resin, a curing agent and an inorganic filler, and a conventionally known mixing method can be used.
- a conventionally known mixing method include, but are not limited to, a blender method, a Henschel method, a pan mill method, a power mill method, and a vertical method.
- a conventionally known mixer can be used without particular limitation, and examples thereof include a V-type mixer, a Henschel mixer, a rocking mixer, a Nauta mixer, and a super mixer.
- the kneading step is a step of kneading the mixture obtained in the mixing step to obtain a kneaded product.
- This kneading step is to knead the above mixture using a conventionally used kneader, and examples of the kneader include conventionally known biaxial kneaders and roll kneaders, and are particularly limited. is not.
- the twin-screw kneader has a screw shaft that rotates in the same direction and is arranged in parallel in a cylinder in which a material supply port and a material discharge port after kneading are formed. It is kneaded while being sent forward by a screw blade.
- the roll kneading device has a driving means including a speed reducer and the like, a pair of rolls composed of a first roll and a second roll arranged in parallel at a constant interval, and both ends of the first roll. And a gap adjusting mechanism unit for adjusting the gap between the pair of rolls, the kneading material is supplied between the pair of rolls, and then the pair of rolls are mixed with each other by the driving means. The mixture is kneaded by driving in the direction in which it is caught in between.
- the kneading temperature may be 70 to 110°C, or 80 to 105°C.
- the rolling step is a step of rolling the kneaded material obtained in the kneading step into a sheet-like composition with a rolling roll.
- the thickness of the sheet composition may be 1 mm or more and 5 mm or less, and may be 1 mm or more and 3 mm or less in order to increase the cooling efficiency of the sheet composition.
- the rolling roll temperature is usually 10 to 60°C, and may be 10 to 50°C.
- the cooling step is a step in which the sheet-shaped composition obtained in the rolling step is cooled in a gas while being conveyed by a cooling conveyor.
- the sheet-shaped composition obtained in the rolling step is conveyed by a cooling conveyor and cooled while passing under a low temperature gas atmosphere.
- the material and shape of the cooling conveyor that conveys the sheet-shaped composition are not particularly limited, but a mesh-shaped cooling conveyor that does not prevent circulation of low-temperature gas may be used. Further, from the viewpoint of cooling efficiency and workability, the cooling conveyor may be covered with a housing or the like.
- the low-temperature gas includes air, nitrogen gas, carbon dioxide gas, etc., but may be air from the viewpoint of workability.
- the nitrogen gas can be obtained from liquid nitrogen.
- Carbon dioxide can be obtained from dry ice or the like.
- a low-temperature gas may be blown onto the sheet-shaped composition to cool it.
- the sheet composition may be cooled to 5 to 30°C or 10 to 15°C while being conveyed by a cooling conveyor.
- the temperature of the gas may be 0 to 15°C or 0 to 10°C.
- a gas at 0 to 15° C. may be blown directly onto the sheet composition as cold air.
- the wind speed at the time of blowing cold air may be 1 to 50 m/sec.
- the gas used at this time may be air.
- the pulverizing step is a step of pulverizing the sheet-shaped composition cooled in the cooling step with a pulverizer.
- the sheet-like composition is pulverized into a pulverized product by a pulverizer used in a conventionally known general method for producing a molding material for semiconductor encapsulation.
- the crusher is not particularly limited as long as it can crush to a size of 5 mm or less, and examples thereof include a cutting mill, a ball mill, a cyclone mill, a hammer mill, a vibration mill, a cutter mill, a grinder mill, Examples include speed mills. Among them, the crusher may be a speed mill.
- the pulverization by the pulverizer may be carried out in two or more steps, for example, by pulverizing the sheet-like composition relatively coarsely by a coarse pulverizer or the like and then finely pulverizing it by a fine pulverizer to obtain a pulverized product.
- the crushing in the crushing process may be performed in the air with low temperature and low dew point.
- the temperature of the air having a low temperature and a low dew point may be 10° C. or lower.
- the crushed product obtained in the above crushing process may be temporarily stored in a filling tank.
- the crushing/classifying step is a step of crushing/classifying an object to be crushed into particles having a particle size of 100 ⁇ m or less.
- the object to be ground is ground to a particle size range of 10 to 40 ⁇ m.
- the particle size means, for example, a particle size (d50) at which the cumulative volume becomes 50% in the particle size distribution measured by a laser diffraction type particle size distribution measuring device.
- the object to be crushed is a raw material when the crushing/classifying step is performed before the mixing step, and when the crushing/classifying step is performed after the mixing step and before the kneading step. Is a mixture, and when the crushing/classifying step is performed after the kneading step and before the rolling step, it is the kneading material, and the crushing/classifying step is performed after the rolling step and before the cooling step.
- a sheet-like composition it is a sheet-like composition when the pulverizing/classifying step is performed after the cooling step and before the pulverizing step, and the pulverizing/classifying step is performed after the pulverizing step. In some cases, it is a crushed product.
- the crusher the device exemplified in the above (crushing step) can be used.
- the pulverization in this step may be performed at a low temperature of 10° C. or lower or in a frozen atmosphere.
- the temperature range may be ⁇ 30 to 10° C., ⁇ 20 to 5° C., or ⁇ 10 to 0° C. Grinding in such a low temperature/freezing atmosphere causes the molding compound for sealing to embrittle at low temperature, which allows easy crushing of fine aggregates or gel-like substances generated during the manufacturing process. To be done. Further, it is also effective for finely pulverizing the rubber-like additive.
- the cold source for example, a liquefied nitrogen refrigerator is used.
- the cold source may be a dry dehumidifier using a rotary rotor (low temperature low dew point air generator).
- the pulverized product obtained by the above pulverization is classified into a pulverized product having a particle size of 100 ⁇ m or less by sieving and air classification.
- the opening of the sieve used for sieving may be 60 to 100 ⁇ m or 60 to 80 ⁇ m.
- crushing of the crushed object and classification of the crushed crushed material may be performed at the same time.
- An example of an apparatus that can perform crushing and classification at the same time is a crusher with a built-in classifier, which includes a crushing unit for crushing an object to be crushed and a classifying unit for classifying the crushed product.
- the crusher with a built-in classifier is not particularly limited.
- a refrigerating and grinding apparatus configured to be ground by repeating collision of the object to be ground between these members may be used. ..
- Such a freeze-grinding device is described in, for example, Japanese Patent Publication No. 57-60060 and Japanese Patent Laid-Open No. 2017-912.
- the rotation speed of the crusher with a built-in classifier may be 1000 to 8000 rpm, 2000 to 6000 rpm, or 2000 to 5000 rpm from the viewpoint of efficiently crushing the object to be crushed.
- the molding compound for semiconductor encapsulation obtained through the above step has a content of aggregates and/or gel substances having a size of more than 100 ⁇ m of 50 ppm or less, may be 30 ppm or less, and may be 10 ppm or less. It may be 0 ppm.
- a method for producing a molding material for semiconductor encapsulation of a second embodiment of the present disclosure includes a mixing step of mixing raw materials including an epoxy resin, a curing agent and an inorganic filler.
- the sheet-shaped composition rolled in the first rolling step is conveyed by a cooling conveyor while being cooled in a gas in a first cooling step, and the sheet-shaped composition cooled in the first cooling step is crushed by a crusher.
- the crushing/classifying step is performed, and the second rolling step, the second rolling step are performed.
- the cooling step and the second crushing step are performed.
- the mixing step, kneading step, first rolling step, first cooling step, and first crushing step in the second embodiment are the mixing step, kneading step, rolling step, and cooling step of the first embodiment, respectively. Since it is the same as the crushing step, detailed description is omitted.
- the crushing/classifying step in the second embodiment is performed after the first crushing step. Thereby, the size of the molding material for semiconductor encapsulation can be processed into a desired size.
- the pulverized product obtained in the first pulverizing step is pulverized to have a particle size of 100 ⁇ m or less, and then classified to a pulverized product having a particle size of 100 ⁇ m or less. Since the pulverizing method and the classifying method are the same as the pulverizing/classifying step of the first embodiment, detailed description thereof will be omitted.
- the crushing device and the classifying device the devices exemplified in the section (Crushing/classifying process) of the first embodiment can be used.
- the second rolling step is a step of rolling the crushed material obtained in the crushing/classifying step into a sheet using a rolling roll, as in the first rolling step.
- the thickness of the sheet composition may be 1 mm or more and 5 mm or less as in the first rolling step, and may be 1 mm or more and 3 mm or less from the viewpoint of improving cooling efficiency.
- the rolling roll temperature is usually 10 to 60° C., and may be 10 to 50° C.
- the second cooling step is a step of cooling the sheet-shaped composition obtained in the second rolling step in a gas while being conveyed by a cooling conveyor in the same manner as in the first cooling step.
- the second pulverizing step is a step of pulverizing the sheet-shaped composition cooled in the second cooling step with a pulverizer in the same manner as in the first pulverizing step.
- the crushing device the device exemplified in the section (Crushing step) of the first embodiment can be used.
- the crushed product obtained in the second crushing step may be subjected to sieve classification and air classification.
- the molding compound for semiconductor encapsulation obtained through the above step has a content of aggregates and/or gel substances having a size of more than 100 ⁇ m of 50 ppm or less, may be 30 ppm or less, and may be 10 ppm or less. It may be 0 ppm.
- the molding material for semiconductor encapsulation obtained through the above steps may be stored, for example, in a storage cabinet in a low temperature atmosphere.
- the temperature of the storage in the low temperature atmosphere may be -5 to 5°C or -5 to 3°C.
- the powdery granular molding material for semiconductor encapsulation obtained through the above steps is processed into a tablet having an appropriate size and mass for transfer molding using a known tablet molding machine, and a tablet-shaped semiconductor encapsulation material. It may be used as a stop molding material.
- a semiconductor device of the present disclosure is obtained by encapsulating a semiconductor element with the above-mentioned semiconductor encapsulating molding material. Specifically, active elements such as semiconductor chips, transistors, diodes, thyristors, and passive elements such as capacitors, resistors, and coils are mounted on support members such as lead frames, tape carriers, wiring boards, and silicon wafers. Then, a semiconductor device in which a necessary portion is sealed with the semiconductor sealing molding material of the present disclosure can be given.
- the method for encapsulating a semiconductor element using the semiconductor encapsulating molding material of the present disclosure is not particularly limited, and examples thereof include a transfer molding method, an injection molding method, and a compression molding method.
- Example 1 5.64 parts by mass of epoxy resin YL-6121H (trade name, manufactured by Mitsubishi Chemical Co., Ltd.) as a raw material of a molding material for sealing, and phenol resin MEH-7500 (trade name, manufactured by Meiwa Kasei Co., Ltd.) as a curing agent.
- epoxy resin YL-6121H trade name, manufactured by Mitsubishi Chemical Co., Ltd.
- phenol resin MEH-7500 trade name, manufactured by Meiwa Kasei Co., Ltd.
- spherical silica mixture FB-105FC (trade name, manufactured by Denki Kagaku Kogyo Co., Ltd., average particle size: 12 ⁇ m) 89 parts by mass, carnauba wax 0.3 parts by mass, as a curing accelerator 0.1 parts by weight of 2MZ-P (trade name, manufactured by Shikoku Kasei Co., Ltd.), 0.4 parts by weight of ⁇ -glycidoxypropyltriethoxysilane as a silane coupling agent, 0.2 parts by weight of carbon black, 1 mm
- the above raw materials were put into a mixer (manufactured by Nippon Coke Industry Co., Ltd., product name: FM mixer) and mixed for 3 minutes (mixing step).
- the mixture obtained in the mixing step is put into a twin-screw kneader (Kurimoto Iron Works Co., Ltd., trade name: KRC-T-2), and kneaded at a kneading temperature of 100° C. and a kneading time of 5 minutes. Done (kneading process).
- the kneaded product obtained in the kneading process was rolled to a thickness of 1 mm using a press roll having a surface temperature of 15°C to obtain a sheet-shaped composition (rolling process).
- the sheet-shaped composition obtained in the rolling process was conveyed on a steel belt conveyor and cooled by applying cold air at 15°C or lower (cooling process).
- the sheet-like composition cooled in the cooling process was put into a speed mill (manufactured by Gohashi Seisakusho Co., Ltd.) and crushed at a temperature of 8°C until a 2 mm mesh pass was reached (crushing process).
- the pulverized product obtained in the pulverizing step is put into a pulverizer with a built-in classifier (manufactured by Hosokawa Micron Co., Ltd., trade name: Linrex Mill LX), the temperature is 8° C., a pulverizing disk 3000 rpm, a classifying rotor 2300 rpm, and a supply amount 100 kg/
- the material was pulverized under the condition of time, the pulverized material having a particle size of 100 ⁇ m or less was classified, and only the pulverized material was conveyed to the next step (pulverization/classification step).
- a crushed product having a particle size of 100 ⁇ m or less obtained in the crushing/classifying process is processed into a cylindrical tablet having a diameter of 14 mm and a height of 20 mm by a high-pressure tableting machine (Kikusui Seisakusho, Ltd., product name: BAPRESS) and transferred.
- a molding tablet (molding material for sealing) was obtained (tablet molding step).
- Example 2 5.64 parts by mass of epoxy resin YL-6121H (trade name, manufactured by Mitsubishi Chemical Co., Ltd.) is used as a raw material for a molding material for sealing, and phenol resin MEH-7500 (trade name, manufactured by Meiwa Kasei Co., Ltd.) is used as a curing agent.
- epoxy resin YL-6121H trade name, manufactured by Mitsubishi Chemical Co., Ltd.
- phenol resin MEH-7500 (trade name, manufactured by Meiwa Kasei Co., Ltd.) is used as a curing agent.
- spherical silica mixture FB-105FC (trade name, manufactured by Denki Kagaku Kogyo Co., Ltd., average particle size: 12 ⁇ m) 89 parts by mass, carnauba wax 0.3 parts by mass, as a curing accelerator 0.1 parts by weight of 2MZ-P (trade name, manufactured by Shikoku Kasei Co., Ltd.), 0.4 parts by weight of ⁇ -glycidoxypropyltriethoxysilane as a silane coupling agent, 0.2 parts by weight of carbon black, 1 mm
- the mass of the spherical silica having a size of 2 mm or less and the coupling agent, 0.05 parts by mass (content in the molding material for sealing 505 ppm) was prepared and treated by each step shown in FIG. 2 to obtain the molding material for sealing. It was
- the above raw materials were put into a mixer (manufactured by Nippon Coke Industry Co., Ltd., product name: FM mixer) and mixed for 3 minutes (mixing step).
- the mixture obtained in the mixing step is put into a twin-screw kneader (Kurimoto Iron Works Co., Ltd., trade name: KRC-T-2), and kneaded at a kneading temperature of 100° C. and a kneading time of 5 minutes. Done (kneading process).
- the kneaded product obtained in the kneading step was rolled to a thickness of 1 mm using a press roll having a surface temperature of 15°C to obtain a sheet-like composition (first rolling step).
- the sheet-shaped composition obtained in the first rolling step was conveyed on a steel belt conveyor and cooled by applying cold air at 15°C or lower (first cooling step).
- the sheet composition cooled in the first cooling step was put into a speed mill (manufactured by Gohashi Seisakusho Co., Ltd.) and pulverized at a temperature of 8° C. until a 2 mm mesh pass was reached (first pulverizing step).
- the crushed product obtained in the first crushing step is put into a crusher with a built-in classifier (Hosokawa Micron Co., Ltd., trade name: Linrex Mill LX), and at a temperature of 8° C., a crushing disk 3000 rpm, a classifying rotor 2300 rpm, supply
- the pulverized product was pulverized under the condition of the amount of 100 kg/hour, the pulverized product having a particle size of 100 ⁇ m or less was classified, and only the pulverized product was conveyed to the next process (pulverization/classification process).
- the pulverized product having a particle size of 100 ⁇ m or less obtained in the pulverization/classification process was rolled to a thickness of 1 mm using a press roll having a surface temperature of 40° C. to obtain a sheet-like composition (second rolling process).
- the sheet-shaped composition obtained in the second rolling step was conveyed on a steel belt conveyor and cooled by applying cool air of 15°C or lower (second cooling step).
- the sheet-shaped composition cooled in the second cooling step was put into a speed mill (manufactured by Gohashi Manufacturing Co., Ltd.) and pulverized at a temperature of 8° C. until a 2 mm mesh pass was reached (second pulverization step).
- the crushed product obtained in the second crushing step was sieved using a sieve having an opening of 0.2 to 2.0 mm (sieving step).
- Comparative Example 1 The encapsulating molding material of Comparative Example 1 in the same manner as in Example 2 except that the first rolling step, the first cooling step, the first crushing step, and the crushing/classifying step were not performed in Example 2.
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Abstract
Description
[1]大きさ100μm超の凝集物及び/又はゲル状物質の含有率が50ppm以下である半導体封止用成形材料。
[2]エポキシ樹脂、硬化剤及び無機充填剤を含む原材料を混合する混合工程と、前記混合工程で得られた混合物を混練して混練物とする混練工程と、前記混練工程で得られた混練物を圧延ロールでシート状組成物に圧延する圧延工程と、前記圧延工程で圧延したシート状組成物を冷却コンベアにて搬送しながら、気体中で冷却する冷却工程と、前記冷却工程で冷却したシート状組成物を粉砕機にて粉砕する粉砕工程と、を有する半導体封止用成形材料の製造方法であって、さらに粉砕対象物を粒度100μm以下に粉砕・分級する粉砕・分級工程を有することを特徴とする上記[1]に記載の半導体封止用成形材料の製造方法。
[3]エポキシ樹脂、硬化剤及び無機充填剤を含む原材料を混合する混合工程と、前記混合工程で得られた混合物を混練して混練物とする混練工程と、前記混練工程で得られた混練物を圧延ロールでシート状組成物に圧延する第1の圧延工程と、前記第1の圧延工程で圧延したシート状組成物を冷却コンベアにて搬送しながら、気体中で冷却する第1の冷却工程と、前記第1の冷却工程で冷却したシート状組成物を粉砕機にて粉砕する第1の粉砕工程と、前記第1の粉砕工程で得られた粉砕物を粒度100μm以下に粉砕・分級する粉砕・分級工程と、前記粉砕・分級工程で得られた粉砕物を圧延ロールでシート状に圧延する第2の圧延工程と、前記第2の圧延工程で圧延したシート状組成物を冷却コンベアにて搬送しながら、気体中で冷却する第2の冷却工程と、前記第2の冷却工程で冷却したシート状組成物を粉砕機にて粉砕する第2の粉砕工程と、を有する上記[1]に記載の半導体封止用成形材料の製造方法。
[4]前記粉砕・分級工程において、粉砕・分級を10℃以下の低温雰囲気で行う上記[2]又は[3]に記載の半導体封止用成形材料の製造方法。
[5]半導体素子を、上記[1]に記載の半導体封止用成形材料で封止してなる半導体装置。
<半導体封止用成形材料>
本開示の半導体封止用成形材料(以下、単に封止用成形材料ともいう)は、大きさ100μm超の凝集物及び/又はゲル状物質の含有率が50ppm以下である。封止用成形材料中に含まれる大きさ100μm超の凝集物及び/又はゲル状物質の含有率が50ppmを超えると、半導体パッケージのチップ上樹脂厚さが100μm以下となるように上記封止用成形材料により上記チップを封止する場合、樹脂表面に凝集物及びゲル状物質が突起として現れ、外観異常、ワイヤ変形、チップの割れ等の不具合を発生させるおそれがある。このような観点から、封止用成形材料中に含まれる大きさ100μm超の凝集物及び/又はゲル状物質の含有率は、30ppm以下であってもよく、10ppm以下であってもよく、0ppmであってもよい。
ここで、本明細書において、大きさ100μm超の凝集物及びゲル状物質としては、無機充填剤の凝集物及びゲル状物質、無機充填剤及びシランカップリング剤の凝集物及びゲル状物質、熱硬化性樹脂の反応硬化物等が挙げられる。
なお、本明細書において、無機充填材の平均粒径は、例えば、レーザー回折式粒度分布測定装置により求めることができる。平均粒径は、同装置で測定された粒度分布において積算体積が50%になる粒径(d50)である。
本開示の第一の実施形態の半導体封止用成形材料の製造方法(以下、単に第一の実施形態ともいう)は、エポキシ樹脂、硬化剤及び無機充填剤を含む原材料を混合する混合工程と、前記混合工程で得られた混合物を混練して混練物とする混練工程と、前記混練工程で得られた混練物を圧延ロールでシート状組成物に圧延する圧延工程と、前記圧延工程で圧延したシート状組成物を冷却コンベアにて搬送しながら、気体中で冷却する冷却工程と、前記冷却工程で冷却したシート状組成物を粉砕機にて粉砕する粉砕工程と、を有する半導体封止用成形材料の製造方法であって、さらに粉砕対象物を粒度100μm以下に粉砕・分級する粉砕・分級工程を有する。
以下、各工程を順番に説明する。
混合工程は、エポキシ樹脂、硬化剤及び無機充填剤を含む原材料を混合する工程であり、従来公知の混合方法を用いることができる。混合方法としては、例えば、ブレンダー法、へンシェル法、パンミル法、パワーミル法、バーチカル法等が挙げられるが、特に限定されるものではない。
また、混合機としては、従来公知のものを特に制限なく用いることができ、例えば、V型混合機、ヘンシェルミキサー、ロッキングミキサー、ナウターミキサー、スーパーミキサーなどが挙げられる。
混練工程は、前記混合工程で得られた混合物を混練して混練物とする工程である。この混練工程は、従来使用されている混練機を用いて、上記混合物を混練するもので、混練機としては、従来公知の二軸混練機、ロール混練機等が挙げられ、特に限定されるものではない。
圧延工程は、前記混練工程で得られた混練物を圧延ロールでシート状組成物に圧延する工程である。ここで、シート状組成物の厚みは1mm以上5mm以下であってもよく、このシート状組成物の冷却効率を上げるためには1mm以上3mm以下であってもよい。
圧延ロール温度は、通常10~60℃であり、10~50℃であってもよい。
冷却工程は、前記圧延工程で得られたシート状組成物を冷却コンベアにて搬送しながら、気体中で冷却する工程である。この冷却工程では、圧延工程で得られたシート状組成物を冷却コンベアにて搬送しながら、低温の気体雰囲気下を通過させながら冷却する。
粉砕工程は、前記冷却工程で冷却されたシート状組成物を粉砕機にて粉砕する工程である。本工程において、シート状組成物は、従来公知の一般的な半導体封止用成形材料の製造方法に使用される粉砕機にて粉砕され粉砕物となる。粉砕機は、例えば粒径5mm以下の大きさに粉砕可能なものであれば特に限定されるものではなく、例えば、カッティングミル、ボールミル、サイクロンミル、ハンマーミル、振動ミル、カッターミル、グラインダーミル、スピードミル等が挙げられる。中でも、粉砕機はスピードミルであってもよい。
粉砕機による粉砕は、例えば、シート状組成物を粗粉砕機などにより比較的粗く粉砕してから、微粉砕機にてさらに細かく粉砕して粉砕物とする2段階以上で行なってもよい。
粉砕・分級工程は、粉砕対象物を粒度100μm以下に粉砕・分級する工程である。
本工程において、粉砕対象物は、10~40μmの粒度範囲となるように粉砕される。粉砕対象物を粒度100μm以下に粉砕することにより、製造工程中で発生した無機充填剤等の凝集物またはゲル状物質がより細かく解砕される。
ここで、本明細書において、粒度とは、例えば、レーザー回折式粒度分布測定装置により測定された粒度分布において積算体積が50%になる粒径(d50)をいう。
寒冷源としては、例えば液化窒素式冷凍機が用いられる。また、寒冷源は回転式のロータを用いた乾式除湿装置(低温度低露点空気発生装置)などを用いてもよい。
篩い分級に用いられる篩目の開きは、60~100μmであってもよく、60~80μmであってもよい。
以下、各工程を順番に説明する。
第二の実施形態における粉砕・分級工程は、第1の粉砕工程の後に行う。これにより、半導体封止用成型材料の大きさを所望のサイズに加工することができる。
粉砕・分級工程では、第1の粉砕工程で得られた粉砕物を粒度100μm以下に粉砕し、次いで粒度100μm以下の粉砕物に分級する。粉砕方法及び分級方法は、第一の実施形態の粉砕・分級工程と同じであるので詳細な説明は省略する。また、粉砕装置及び分級装置は第一の実施形態の(粉砕・分級工程)の項で例示した装置を用いることができる。
第2の圧延工程は、前記粉砕・分級工程で得られた粉砕物を、第1の圧延工程と同様にして、圧延ロールを用いてシート状に圧延する工程である。ここで、シート状組成物の厚みは第1の圧延工程と同様に、1mm以上5mm以下であってもよく、冷却効率を上げる観点から1mm以上3mm以下であってもよい。
また、圧延ロール温度は、通常10~60℃であり、10~50℃であってもよい。
第2の冷却工程は、前記第2の圧延工程で得られたシート状組成物を、第1の冷却工程と同様にして、冷却コンベアにて搬送しながら、気体中で冷却する工程である。
第2の粉砕工程は、第2の冷却工程で冷却されたシート状組成物を、第1の粉砕工程と同様にして、粉砕機にて粉砕する工程である。粉砕装置は、第一の実施形態の(粉砕工程)の項で例示した装置を用いることができる。
本開示の半導体装置は、半導体素子を、前述の半導体封止用成形材料で封止してなる。具体的には、リードフレーム、テープキャリア、配線板、シリコンウエハ等の支持部材に、半導体チップ、トランジスタ、ダイオード、サイリスタ等の能動素子、コンデンサ、抵抗体、コイル等の受動素子等の素子を搭載し、必要な部分を本開示の半導体封止用成形材料で封止した半導体装置が挙げられる。
封止用成形材料の原料として、エポキシ樹脂 YL-6121H(商品名、三菱化学株式会社製)を5.64質量部、硬化剤として、フェノール樹脂 MEH-7500(商品名、明和化成株式会社製)3.36質量部、無機充填剤として、球状シリカ混合物 FB-105FC(商品名、電気化学工業株式会社製、平均粒径:12μm)89質量部、カルナバワックス 0.3質量部、硬化促進剤として、2MZ-P(商品名、四国化成株式会社製)0.1質量部、シランカップリング剤として、γ-グリシドキシプロピルトリエトキシシラン 0.4質量部、カーボンブラック 0.2質量部、1mm以上2mm以下の球状シリカとカップリング剤の凝集物0.05質量部(封止用成形材料中の含有率505ppm)を準備し、図1に示す各工程により処理し封止用成形材料を得た。
封止用成形材料の原料として、エポキシ樹脂 YL-6121H(商品名、三菱化学株式会社製)を5.64質量部、硬化剤として、フェノール樹脂 MEH-7500(商品名、明和化成株式会社製)3.36質量部、無機充填剤として、球状シリカ混合物 FB-105FC(商品名、電気化学工業株式会社製、平均粒径:12μm)89質量部、カルナバワックス 0.3質量部、硬化促進剤として、2MZ-P(商品名、四国化成株式会社製)0.1質量部、シランカップリング剤として、γ-グリシドキシプロピルトリエトキシシラン 0.4質量部、カーボンブラック 0.2質量部、1mm以上2mm以下の球状シリカとカップリング剤の凝集物0.05質量部(封止用成形材料中の含有率505ppm)を準備し、図2に示す各工程により処理し封止用成形材料を得た。
実施例2において、第1の圧延工程、第1の冷却工程、第1の粉砕工程、粉砕・分級工程を行わなかったこと以外は実施例2と同様にして比較例1の封止用成形材料を得た。
[封止用成形材料中の凝集物及び/又はゲル状物質除去性評価]
実施例1、2及び比較例1で得られた封止用成形材料をそれぞれ150g秤量し、アセトン200ccに分散させ、30分間撹拌した。その後、公称目開き106μmの篩を用いてろ過し、大きさ106μmより大きい凝集物及びゲル状物質の残さの重量を測定し、封止用成形材料中に含まれる大きさ106μm超の凝集物及び/又はゲル状物質の含有率を算出し、下記判定基準により評価した。
A:10ppm以下
B:10ppm超、50ppm以下
C:50ppm超
前記封止用成形材料を用いて、チップ上樹脂厚さが100μmとなるように設定したFBGA(50mm×50mm×0.54mm)を、175℃で、2分間成形した後、成形品表面を目視観察し、下記判定基準により評価した。
A:突起の発生なし
C:突起の発生あり
Claims (5)
- 大きさ100μm超の凝集物及び/又はゲル状物質の含有率が50ppm以下である半導体封止用成形材料。
- エポキシ樹脂、硬化剤及び無機充填剤を含む原材料を混合する混合工程と、
前記混合工程で得られた混合物を混練して混練物とする混練工程と、
前記混練工程で得られた混練物を圧延ロールでシート状組成物に圧延する圧延工程と、
前記圧延工程で圧延したシート状組成物を冷却コンベアにて搬送しながら、気体中で冷却する冷却工程と、
前記冷却工程で冷却したシート状組成物を粉砕機にて粉砕する粉砕工程と、
を有する半導体封止用成形材料の製造方法であって、
さらに粉砕対象物を粒度100μm以下に粉砕・分級する粉砕・分級工程を有することを特徴とする請求項1に記載の半導体封止用成形材料の製造方法。 - エポキシ樹脂、硬化剤及び無機充填剤を含む原材料を混合する混合工程と、
前記混合工程で得られた混合物を混練して混練物とする混練工程と、
前記混練工程で得られた混練物を圧延ロールでシート状組成物に圧延する第1の圧延工程と、
前記第1の圧延工程で圧延したシート状組成物を冷却コンベアにて搬送しながら、気体中で冷却する第1の冷却工程と、
前記第1の冷却工程で冷却したシート状組成物を粉砕機にて粉砕する第1の粉砕工程と、
前記第1の粉砕工程で得られた粉砕物を粒度100μm以下に粉砕・分級する粉砕・分級工程と、
前記粉砕・分級工程で得られた粉砕物を圧延ロールでシート状に圧延する第2の圧延工程と、
前記第2の圧延工程で圧延したシート状組成物を冷却コンベアにて搬送しながら、気体中で冷却する第2の冷却工程と、
前記第2の冷却工程で冷却したシート状組成物を粉砕機にて粉砕する第2の粉砕工程と、を有する請求項1に記載の半導体封止用成形材料の製造方法。 - 前記粉砕・分級工程において、粉砕・分級を10℃以下の低温雰囲気で行う請求項2又は3に記載の半導体封止用成形材料の製造方法。
- 半導体素子を、請求項1に記載の半導体封止用成形材料で封止してなる半導体装置。
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TW202039687A (zh) | 2020-11-01 |
KR20210091238A (ko) | 2021-07-21 |
CN113227217B (zh) | 2024-02-09 |
JPWO2020129885A1 (ja) | 2021-11-04 |
TWI743632B (zh) | 2021-10-21 |
CN113227217A (zh) | 2021-08-06 |
KR102577534B1 (ko) | 2023-09-13 |
JP7270645B2 (ja) | 2023-05-10 |
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