WO2009128206A1 - フリップチップ実装方法とフリップチップ実装装置およびそれに使用されるツール保護シート - Google Patents
フリップチップ実装方法とフリップチップ実装装置およびそれに使用されるツール保護シート Download PDFInfo
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- WO2009128206A1 WO2009128206A1 PCT/JP2009/001432 JP2009001432W WO2009128206A1 WO 2009128206 A1 WO2009128206 A1 WO 2009128206A1 JP 2009001432 W JP2009001432 W JP 2009001432W WO 2009128206 A1 WO2009128206 A1 WO 2009128206A1
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- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
- Y10T428/249954—With chemically effective material or specified gas other than air, N, or carbon dioxide in void-containing component
Definitions
- the present invention relates to a flip chip mounting method and a flip chip mounting apparatus.
- a flip chip type semiconductor device is configured by mounting a semiconductor chip having internal connection terminals such as metal bump electrodes on a wiring board by flip chip connection.
- the wiring board has wiring patterns formed on both sides thereof, and both are electrically connected via vias (through holes) formed in the wiring board.
- One of the wiring patterns is connected to an internal connection terminal of a semiconductor element, and the other is connected to an external connection terminal such as a solder ball.
- a region between the semiconductor element and the wiring board where the internal connection terminals of the semiconductor element are connected to the wiring pattern is filled with a thermosetting resin made of epoxy resin or the like to protect the internal connection terminals.
- the anisotropic conductive adhesive film 103 is placed on the semiconductor chip 102.
- the semiconductor chip 102 is positioned and disposed in a flip chip state.
- an elastomer having a rubber hardness of 40 or more and 80 or less is set as the crimping portion 105.
- the top and side portions of the semiconductor chip 102 are heated and pressed by the thermocompression bonding head 104 via the crimping portion 105, whereby the anisotropic conductive adhesive film 103 is formed in a predetermined manner.
- Pressure curing can be performed with a pressure difference. That is, a sufficient pressure can be applied to the connection portion of the wiring substrate 101 and the semiconductor chip 102, and the fillet portion around the semiconductor chip 102 can be pressurized so that no void is generated.
- thermocompression bonding head 104 since the semiconductor chip 102 is heated and pressurized by the thermocompression bonding head 104 via the elastomer pressure bonding portion 105, the heat conduction from the thermocompression bonding head 104 is poor and it takes time to increase the temperature. It takes more time to cure the anisotropic conductive adhesive film 103 between and the production lead time.
- thermocompression bonding head 104 in order to raise the temperature of the elastomer of the crimping part 105 in advance, the thermocompression bonding head 104 must be maintained in a considerably high temperature state. The thickness varies due to the heat resistance and temperature variation of the elastomer, and the anisotropic conductive adhesive film 103 is not uniformly cured.
- thermocompression bonding head 104 and the semiconductor chip 102 it is difficult to pressurize the thermocompression bonding head 104 and the semiconductor chip 102 in parallel with each other, and it becomes difficult to uniformly control the bump height of the semiconductor chip 102 by the load.
- the semiconductor chip 102 has a large number of pins, it becomes more difficult to control the bump height by controlling the load.
- the present invention provides a flip chip mounting method that has low bump height variation of a semiconductor chip, can be cured for a short time while applying external pressure to the underfill resin between the semiconductor chip and the wiring substrate, and has high productivity with a short lead time.
- An object is to provide a flip chip mounting apparatus.
- the semiconductor chip when the semiconductor chip is flip-chip mounted on the wiring board by interposing a thermosetting underfill resin between the semiconductor chip and the wiring board, the wiring board and the wiring board
- the semiconductor chip positioned and disposed by sandwiching a thermosetting underfill resin between the semiconductor chips is heated at least from above the tool protection sheet having a two-layer film structure of a base film and a pressure film, While the underfill resin under the semiconductor chip is cured, the pressure film is separated from the tool protection sheet other than the pressure part directly above the semiconductor chip, and the separated pressure film is around the semiconductor chip.
- the underfill resin is in contact with the underfill resin while being swelled and cured while being pressurized and heated to the wiring board. Characterized in that to fix the semiconductor chip.
- the flip chip mounting method according to claim 2 of the present invention is the flip chip mounting method according to claim 1, wherein the tool protection sheet is formed by sealing at least one of solid, liquid, and gas between a base film and a pressure film.
- Solid is a foam material, for example, a mixed resin that combines an ether resin, ester urethane resin, or thermally expandable capsule with an adhesive (acrylic resin, rubber resin, silicone adhesive), such as Riva Alpha. Is preferable.
- the liquid is preferably a low-boiling solvent such as ethanol or IPA, which is a volatile expansion material.
- the gas is preferably a gas that easily expands upon heating, such as air (air, dry air), an inert gas such as nitrogen, or hydrogen.
- the semiconductor chip when the semiconductor chip is flip-chip mounted on the wiring board by interposing a thermosetting underfill resin between the semiconductor chip and the wiring board, the wiring board and the wiring board
- the semiconductor chip which is positioned and disposed with a thermosetting underfill resin sandwiched between semiconductor chips, has a three-layer film structure of a base film, a pressure film, and a shield film attached to the pressure film. While pressing and heating from above the tool protection sheet, while curing the underfill resin under the semiconductor chip, the pressure film is separated from the tool protection sheet other than the pressurization part directly above the semiconductor chip, The separated pressurizing film passes through the shield film and the underfill around the semiconductor chip. Cured with heating in contact with pressurized and while bulge fat, together with fixing the semiconductor chip on the wiring board, characterized by bonding the shielding film on the side of the semiconductor chip.
- the flip chip mounting method according to claim 4 of the present invention is the flip chip mounting method according to claim 3, wherein the tool protection sheet is formed by sealing at least one of solid, liquid, and gas between a base film and a pressure film. It is characterized by.
- the tool protection sheet according to claim 5 of the present invention has at least a two-layer film structure of a base film and a pressure film, and when heated, the portion of the pressure film that is not pressurized is separated from the base film. It is configured to swell.
- the tool protection sheet according to claim 6 of the present invention is characterized in that in claim 5, at least one of solid, liquid and gas is sealed between the base film and the pressure film.
- the tool protection sheet according to claim 7 of the present invention has a three-layer film structure of at least a base film, a pressure film, and a shield film attached to the pressure film, and the portion of the portion that is not pressurized when heated.
- the pressurizing film is configured to swell separately from the base film.
- the tool protection sheet according to claim 8 of the present invention is characterized in that in claim 7, at least one of solid, liquid, and gas is sealed between the base film and the pressure film.
- a flip-chip mounting apparatus is a flip-chip mounting apparatus for flip-chip mounting a semiconductor chip on a wiring board by interposing a thermosetting underfill resin between the semiconductor chip and the wiring board. And holding the tool protective sheet of at least a base film and a pressure film in a two-layer film structure or at least a base film, a pressure film, and a shield film in a three-layer film structure attached to the pressure film, The semiconductor chip positioned and disposed with a thermosetting underfill resin sandwiched between the semiconductor chips, a sheet fixing jig that covers the semiconductor chip, and pressing the semiconductor chip while heating the wiring board, The tool between the inner periphery of the sheet fixing jig and the outer periphery of the semiconductor chip The protection sheet, wherein the projection for pressing the peripheral portion of the heat curable underfill resin is provided and formed pressure-heating tool.
- the semiconductor chip is heated and pressurized via the tool protective sheet having a two-layer film structure or a three-layer film structure, and the pressure just above the semiconductor chip is cured while curing the underfill resin under the semiconductor chip.
- the pressure film is separated from the tool protection sheet other than the portion, and the separated pressure film swells against the underfill resin around the semiconductor chip and is cured while being pressurized and heated.
- FIG. 2A, FIG. 2B, and FIG. 3 show Embodiment 1 of the present invention.
- the flip chip mounting method according to the first embodiment is a mounting method using a tool protection sheet, and includes a pre-process shown in FIGS. 1A to 1C for positioning a semiconductor chip with respect to a wiring board, and a pre-process. 2A and 2B and the subsequent steps shown in FIGS. 3A to 3E, which are then performed and press the semiconductor chip through the tool protection sheet.
- bumps 2 are provided on the electrode pads 3 of the semiconductor chip 1.
- the bump 2 may be formed as a stud bump or tear bump by a known wire bonding method, or may be formed by a plating method or a printing method.
- the bump 2 is mainly formed from at least one of gold, copper, palladium, nickel, tin, aluminum, solder and the like. Further, a trace element may be added and contained in the wire for forming the bump 2. In this case, the bump height was about 50 ⁇ m.
- the wiring substrate 6 is a glass epoxy substrate (which may be an aramid substrate, a silicon substrate, or a silicon interposer), has a thickness of 0.2 to 0.4 mm, and the terminal electrode is copper (may be nickel + Au plated). The thickness of 0.15 to 0.2 mm was used.
- the resin of the insulating resin film 5 was an epoxy resin that was cured at 180 ° C. An insulating resin film 5 as an underfill resin that is cut to a size slightly larger than that of the semiconductor chip 1 is attached on the terminal electrode 4 of the wiring board 6 as necessary.
- the semiconductor chip 1 is adsorbed with a tool by the semiconductor chip mounting positioning device 7 and positioned at a desired position of the terminal electrode 4 on the wiring board 6 with a recognition mark or the like as shown in FIG.
- the bumps 2 of the chip 1 are mounted on the corresponding terminal electrodes 4 so as to overlap each other.
- the bump 2 is in a state of being pierced into the insulating resin film 5.
- Some of the bumps 2 penetrate the insulating resin film 5 and are deformed by hitting the terminal electrodes 4.
- the positioning load is about 10 g per bump.
- the semiconductor chip mounting positioning device 7 may be heated by a built-in heater, but the resin must not be cured 100%.
- the semiconductor chip mounting positioning device 7 can be removed after mounting the semiconductor chip 1 as shown in FIG.
- the insulating resin film 5 may be heated in advance at a temperature of about 50 ° C. so that the insulating resin film 5 is adhered and pasted onto the wiring substrate 6. And the tool (not shown) of a sticking apparatus may be heated. The sticking load is 5-10 kgf / cm2. The insulating resin film 5 having a thickness of 50 ⁇ m was used. If the insulating resin film 5 has two layers with a protective separator (not shown), it is peeled off.
- the insulating resin of the insulating resin film 5 is, for example, epoxy resin, phenol resin, polyimide, or insulating thermoplastic resin such as polyphenylene sulfide (PPS), polycarbonate, modified polyphenylene oxide (PPO), or these insulating materials.
- PPS polyphenylene sulfide
- PPO modified polyphenylene oxide
- a mixture of a heat-curable thermosetting resin and an insulating thermoplastic resin can be used.
- the amount of inorganic filler used was 50 wt%. The amount of filler is determined from the stress generated by thermal expansion and warpage between the semiconductor chip 1 and the wiring board 6. Moreover, it determines with the reliability by moisture-resistant adhesiveness by a moisture absorption reflow test, a humidity bias test, etc.
- the insulating resin film 5 preferably has reflow heat resistance (265 ° C. for 10 seconds).
- FIG. 2A the processed product shown in FIG. 1C is conveyed to the pressure heating stage 8, and the back surface of the wiring board 6 is adsorbed to the pressure heating stage 8.
- a tool protection sheet 10 having a two-layer film structure is disposed above the semiconductor chip 1, and a pressure heating tool 11 is disposed above the tool protection sheet 10.
- a sheet fixing jig 9 holds the tool protection sheet 10.
- the pressure heating tool 11 side of the tool protection sheet 10 is preferably a base sheet 10a and a heat resistant film.
- the material of the base film 10a is preferably a heat resistant film such as polyimide, polyphenylene sulfide, or fluororesin.
- the base film 10a has a thickness of about 5 to 10 ⁇ m.
- the semiconductor chip 1 side of the tool protection sheet 10 is a pressure film 10b, which is also preferably a film having heat resistance (NCF curing temperature).
- the material of the pressure film 10b is, for example, polyimide, polyphenylene sulfide, fluorine resin, or the like.
- the pressure film 10b has a thickness of about 5 to 10 ⁇ m.
- a solvent 12 as a liquid is sealed between the base film 10a and the pressure film 10b.
- the solvent 12 is preferable because a low-boiling point solvent such as ethanol or IPA, which is a volatile expansion material, is likely to expand.
- the pressure heating tool 11 presses the semiconductor chip 1 while heating it to the wiring substrate 6, and also heats the tool protection sheet 10 between the inner peripheral portion of the sheet fixing jig 9 and the outer peripheral portion of the semiconductor chip 1.
- a protrusion 25 is formed on the outer peripheral portion of the insulating insulating resin film 5 to transmit heat to the semiconductor chip 1 through the tool protection sheet 10, and further, the curing temperature of the insulating resin film 5 is increased to 180 ° C. In order to become, it set to 210 degreeC. Although the constant heat type was used this time, a ceramic high-speed heating type may be used.
- FIG. 2B is a plan view seen from the pressure heating tool 11 side. The tool protection sheet 10 is clamped and fixed by the sheet fixing jig 9.
- protrusions 25 are formed annularly on the outer periphery of the pressure heating tool 11 in this way, the heat of the pressure heating tool 11 can be transferred to the tool protection sheet 10 more quickly.
- the tool protection sheet 10 is lowered by the sheet fixing jig 9 so as to contact the semiconductor chip 1, and at the same time, the tool protection sheet 10 is pressed against the semiconductor chip 1 by the pressure heating tool 11. However, the semiconductor chip 1 is heated under pressure.
- the solvent 12 between the base film 10a and the pressure film 10b in the tool protection sheet 10 is warmed by the heat from the pressure heating tool 11 and vaporizes and expands.
- the solvent 12 between the base film 10a and the pressure film 10b further expands.
- the height of the bump 2 of the semiconductor chip 1 is brought close to a desired value by the pressure heating tool 11.
- the pressurizing film 10b swells in a space surrounded by the pressurizing / heating tool 11, the sheet fixing jig 9, and the wiring board 6, and the insulating resin film 5 protruding from the end of the semiconductor chip 1 is seen from the side of the semiconductor chip 1.
- the insulating resin film 5 is pressed while being pressed against the fillet portion 19 while the internal pressure in the state where the insulating resin film 5 under the semiconductor chip 1 is pressurized and heated is suppressed by the external pressure by the pressure film 10b. It will harden.
- the deformation load at this time is about 50 g per bump.
- the load is controlled according to the size of the bump 2.
- the bump height is set to 25 ⁇ mt.
- the heating and pressurizing stage 8 may be heated or cooled to control the internal pressure applied to the insulating resin film 5 and suppress the generation of voids.
- FIG. 3E shows a flip chip mounting body obtained by releasing the pressure heating tool 11 after the insulating resin film 5 is cured by the external pressure of the pressure film 10b.
- heat can be easily conducted to and around the semiconductor chip 1 by pressurizing and heating using the thin tool protection sheet 10, and the insulating resin film 5 can be cured.
- the semiconductor chip 1 can be uniformly and parallelly pressurized with the pressurizing / heating tool 11 to be hardened in a short lead time.
- the pressure film 10b can be cured while applying external pressure while pressing against the insulating resin film.
- the tool protection sheet 10 is a thin sheet, it can be flexibly bent unlike rubber, and the fillet portion 19 of the peripheral insulating resin film 5 of the semiconductor chip 1 can be made small, and the generation of voids can be suppressed. .
- an anisotropic conductive film may be used, and nickel powder is plated with gold as conductive particles (not shown) included in the anisotropic conductive film.
- the connection resistance value between the terminal electrode 4 and the bump 2 can be lowered, and good connection reliability can be obtained.
- the conductive particles may be particles obtained by applying nickel or gold plating to resin balls.
- fine particles such as solder as the conductive particles, it is possible to obtain an alloy state connection from the contact state connection between the terminal electrode 4 and the bump 2, and further improve the connection reliability. be able to.
- the wiring board 6 is a single-sided, double-sided or multilayer board, and terminal electrodes 4 corresponding to the bumps 2 of the semiconductor chip 1 are formed on the surface.
- the material may be a ceramic substrate, a resin substrate, a resin flexible sheet (such as polyimide flexible), or a silicon substrate.
- the insulating resin film 5 may be a film-like one attached in an epoxy resin B-stage (semi-solid) state.
- a paste-like material may be formed by coating or printing.
- an inorganic (silica) filler may be included. By controlling the amount of filler, it is possible to change the sticking property, thermal expansion, and elastic modulus of the insulating resin film 5, and to obtain mass productivity and reliability. This time, it was 50 wt%.
- the solvent 12 may be formed not only in a liquid state but also mixed with an adhesive.
- the liquid solvent 12 is sealed or mixed with an adhesive between the base film 10a and the pressure film 10b of the tool protection sheet 10 in FIG. 2A.
- the foam 13 is contained between the base film 10a and the pressure film 10b of the tool protection sheet 10 of the second embodiment as shown in FIG. Is different. The rest is the same as in the first embodiment.
- FIG. 4A in FIG. 4A, the processed product shown in FIG. 1C is conveyed to the pressure heating stage 8, and the back surface of the wiring board is adsorbed to the pressure heating stage 8.
- a tool protection sheet 10 held by a sheet fixing jig 9 is disposed above the semiconductor chip 1.
- the tool protection sheet 10 has a two-layer film structure of a base film 10a and a pressure film 10b, and a foam 13 as a solid is formed between the base film 10a and the pressure film 10b.
- a mixed resin obtained by combining an ether-based resin, an ester-based urethane resin, or a thermally expandable capsule with an adhesive (acrylic resin, rubber resin, silicone adhesive), or Ribaalpha is preferable.
- the foam 13 has the effect of reducing the adhesion area with the adherend due to the increase in surface roughness through the expansion or foaming of the heat-expandable fine particles by heat treatment, the effect of generating the peeling stress at the adhesion interface due to the surface expansion, and the like. Particles that are expressed and whose adhesion to the adherend decreases or disappears may be included.
- the thermally expandable capsule is a microcapsule in which a foaming agent is encapsulated in an outer shell obtained by copolymerizing a barrier thermoplastic resin, and the outer shell softens when heated and expands due to the vaporization pressure of the foaming agent.
- a microsphere manufactured by Kureha Co., Ltd. can be exemplified. See Japanese Patent No. 2898480. Thermally expandable microcapsules obtained by microencapsulating a volatile expansion agent that becomes gaseous at high temperatures may be used.
- the foam 13 is preferably a thermal release sheet (specifically, such as Thermal-Release-Tape-REVALPHA manufactured by Nitto Denko Corporation) that has adhesive strength at room temperature and expands and peels at low temperature.
- the foam may be liquid, semi-solid or solid.
- the foam 13 may be in close contact with the base film 10a and the pressure film 10b together with the pressure-sensitive adhesive, and the pressure film 10b side is easy to peel off, and a gas is present between the base film 10a and the pressure film 10b.
- a closed space may be formed. It may be mixed with an acrylic, rubber or silicone adhesive.
- the pressure heating tool 11 was set to 210 ° C. in order to transfer heat to the semiconductor chip 1 through the tool protection sheet 10 and further to set the curing temperature of the insulating resin film 5 to 180 ° C.
- the tool protection sheet 10 is lowered while being clamped by the sheet fixing jig 9 so as to contact the semiconductor chip 1, and at the same time, the tool protection sheet 10 is attached to the semiconductor chip 1 by the pressure heating tool 11.
- the semiconductor chip 1 is heated under pressure while being pressed and pinched.
- the tool protection sheet 10 is disposed so as to be inclined to the vicinity of the wiring board 6 by the sheet fixing jig 9. At this time, the outer periphery of the pressurizing / heating tool 11 may be inclined toward the insulating resin film 5 to be the fillet portion 19 around the semiconductor chip 1 as shown in FIG. By providing the slope 26, the heat of the pressure heating tool 11 can be transferred to the tool protection sheet 10 more quickly.
- the foam 13 is heated by the heat from the pressure heating tool 11 and expands and expands.
- the pressure heating tool 11 further descends and the tool protection sheet 10 is heated, so that the foam 13 further expands.
- the tool protection sheet 10 is clamped and fixed by the sheet fixing jig 9.
- the height of the bump 2 of the semiconductor chip 1 is brought close to a desired value by the pressure heating tool 11.
- the foam film 13 expands into a space surrounded by the pressure heating tool 11, the sheet fixing jig 9, and the wiring board 6, so that the pressure film 10b expands, and the fillet portion 19 protrudes from the end of the semiconductor chip 1.
- the insulating resin film 5 is cured while applying pressure from the side surface direction, and the internal pressure when the insulating resin film 5 under the semiconductor chip 1 is heated under pressure is suppressed by the external pressure by the pressure film 10b. However, the curing of the insulating resin film 5 proceeds.
- the deformation load of the bump 2 is about 50 g per bump. The load is controlled according to the size of the bump 2. In this case, the bump height is set to 25 ⁇ mt in consideration of reliability. Further, if necessary, the heating and pressurizing stage 8 may be heated or cooled to control the internal pressure applied to the insulating resin film 5 and suppress the generation of voids.
- FIG. 4 (d) shows a flip chip mounting body obtained by releasing the pressure heating tool 11 after the insulating resin film 5 is cured by the external pressure of the pressure film 10b.
- the insulating resin film 5 can be cured.
- the semiconductor chip 1 can be uniformly pressed in parallel with the pressure heating tool 11 and pressurized. It can be cured with a short lead time.
- the foam 13 can be cured by applying external pressure while the pressure film 10 b is pressed against the insulating resin film 5 by vaporizing and expanding.
- the tool protection sheet 10 is a thin sheet, it can be bent flexibly unlike rubber, and the fillet portion 19 of the peripheral insulating resin film 5 of the semiconductor chip 1 can be reduced, thereby suppressing the generation of voids. Can do.
- the liquid solvent 12 is sealed or mixed with an adhesive between the base film 10a and the pressure film 10b of the tool protection sheet 10 in FIG. 2A. 5 (a) and 5 (b), a gas is interposed between the base film 10a and the pressure film 10b of the tool protection sheet 10 according to the third embodiment instead of the solvent 12.
- the tool protection sheet 10 in which the closed space 14 is formed is different. The rest is the same as in the first embodiment.
- the gas that forms the closed space 14 of the tool protection sheet 10 may be any gas that easily expands when heated, such as general air, dry air, inert gas such as nitrogen, hydrogen, and the like.
- the method of closing the long side of the base film 10a and the pressure film 10b only needs to maintain the bag state during heating, such as laminating and fusing by heat equal to or higher than the process temperature, or a heat-resistant adhesive.
- the processed product shown in FIG. 1 (c) is conveyed to the pressure heating stage 8, and the back surface of the wiring board is adsorbed to the pressure heating stage 8.
- a tool protection sheet 10 held by a sheet fixing jig 9 is disposed above the semiconductor chip 1. Further, a pressure heating tool 11 is disposed above the tool protection sheet 10.
- the tool protection sheet 10 is lowered while being clamped by the sheet fixing jig 9 so as to be in contact with the semiconductor chip 1, and at the same time, the tool protection sheet 10 is pressed against the semiconductor chip 1 by the pressure heating tool 11. While sandwiching, the semiconductor chip 1 is heated under pressure.
- the closed space 14 sandwiched between the base film 10 a and the pressure film 10 b of the tool protection sheet 10 is crushed by the pressure heating tool 11 and bulges around the semiconductor chip 1.
- the tool protection sheet 10 is disposed so as to be inclined to the vicinity of the wiring board 6 by the sheet fixing jig 9.
- the outer periphery of the pressurizing / heating tool 11 may be inclined toward the insulating resin film 5 to be the fillet portion 19 around the semiconductor chip 1 as shown in FIG.
- the heat of the pressure heating tool 11 can be transferred to the tool protection sheet 10 more quickly.
- the closed space 14 is heated by the heat from the pressure heating tool 11 and expands.
- the pressurizing and heating tool 11 is further lowered and the tool protection sheet 10 is heated, so that the closed space 14 is further thermally expanded.
- the tool protection sheet 10 is clamped and fixed by the sheet fixing jig 9, and the height of the bump 2 of the semiconductor chip 1 is brought close to a desired value by the pressure heating tool 11.
- the closed space 14 expands into a space surrounded by the pressure heating tool 11, the sheet fixing jig 9 and the wiring substrate 6, whereby the pressure film 10 b expands, and the fillet portion 19 protrudes from the end of the semiconductor chip 1.
- the insulating resin film 5 is cured while applying pressure from the side direction, and the internal pressure when the insulating resin film 5 under the semiconductor chip 1 is heated under pressure is the external pressure by the pressure film 10b. While suppressing, the curing of the insulating resin film 5 proceeds.
- the deformation load of the bump 2 is about 50 g per bump. The load is controlled according to the size of the bump 2. In this case, the bump height is set to 25 ⁇ mt in consideration of reliability. Further, if necessary, the heating and pressurizing stage 8 may be heated or cooled to control the internal pressure applied to the insulating resin film 5 and suppress the generation of voids.
- FIG. 6D shows a flip chip mounting body obtained by releasing after the insulating resin film 5 is cured by the external pressure of the pressure film 10b.
- the insulating resin film 5 can be cured.
- the semiconductor chip 1 can be uniformly pressurized from above and pressurized by the pressure heating tool 11. Moreover, it can be cured with a short lead time. Furthermore, when the closed space 14 is vaporized and expanded, the pressure film 10b can be cured while applying external pressure while being pressed against the insulating resin film 5. As a result, since the tool protection sheet 10 is a thin sheet, it can be bent flexibly unlike rubber, and the fillet portion 19 of the peripheral insulating resin film 5 of the semiconductor chip 1 can be reduced, thereby suppressing the generation of voids. Can do.
- a liquid solvent 12 is sealed or mixed with an adhesive between the base film 10a and the pressure film 10b of the tool protection sheet 10.
- the base film 10a and the pressurizing film instead of the solvent 12 are interposed between the base film 10a and the pressurizing film 10b of the tool protection sheet 10 of the fourth embodiment.
- a UV curable adhesive 15 is formed between the films 10b.
- the base film 10a a UV-shielding light-shielding film is used, and the tool protection sheet 10 is configured such that only the used portion is exposed from the guide.
- the UV light 17 is applied in a state where the light shielding mask 16 is arranged so that UV does not enter the portion in contact with the back surface of the semiconductor chip 1 from the side of the pressure film 10b in contact with the back surface of the semiconductor chip 1.
- the pressure film 10b is irradiated.
- the UV curable adhesive 15 is partially cured, the adhesive strength of the portion is reduced, and the pressure film 10b is easily peeled from the base film 10a.
- the pressure film 10b is partially peeled from the base film 10a by rotating the roller 27 which hits the pressure film 10b side of the sheet fixing jig 9 inward and winding the pressure film 10b.
- the film is slackened toward the center of the tool protection sheet.
- the pressure film 10b is preferably a light transmissive film so that the UV curable adhesive can be easily peeled off. Note that the adhesive thickness and adhesive strength of the UV curable adhesive may be selected and controlled so that the closed space can be easily formed by the film peeling operation of the sheet fixing jig.
- the processed product shown in FIG. 1C is conveyed to the pressure heating stage 8, and the back surface of the wiring board is adsorbed to the pressure heating stage 8.
- a tool protection sheet 10 in which the UV curable adhesive 15 shown in FIG. 7C is peeled and a closed space 14 is formed, and further applied above the tool protection sheet 10.
- a pressure heating tool 11 is disposed.
- the tool protection sheet 10 is lowered while being clamped by the sheet fixing jig 9 so as to contact the semiconductor chip 1, and at the same time, the tool protection sheet 10 is pressed against the semiconductor chip 1 by the pressure heating tool 11. While sandwiching, the semiconductor chip 1 is heated under pressure. The slack of the pressure film 10b is formed as a bulge around the semiconductor chip 1. By applying a load with the pressure heating tool 11, all the bumps 2 break through the insulating resin film 5, and deform while contacting the terminal electrodes 4 of the wiring substrate 6.
- the tool protection sheet 10 is disposed so as to be inclined near the wiring board 6 by the sheet fixing jig 9. At this time, it is preferable to provide the protrusion 25 on the outer periphery of the pressurizing / heating tool 11 and to provide the inclined 26 on the side of the insulating resin film 5 that becomes the fillet portion 19 around the semiconductor chip 1. By providing the slope 26, the heat of the pressure heating tool 11 can be transferred to the tool protection sheet 10 more quickly.
- the pressurizing and heating tool 11 further descends and the tool protection sheet 10 is heated, so that the closed space 14 between the base film 10a and the pressurizing film 10b is further thermally expanded.
- the tool protection sheet 10 is clamped and fixed by the sheet fixing jig 9, and the height of the bump 2 of the semiconductor chip 1 is brought close to a desired value by the pressure heating tool 11.
- the closed space 14 expands into a space surrounded by the pressure heating tool 11, the sheet fixing jig 9 and the wiring substrate 6, whereby the pressure film 10 b expands, and the fillet portion 19 protrudes from the end of the semiconductor chip 1.
- the insulating resin film 5 is cured while applying pressure from the side direction, and the internal pressure when the insulating resin film 5 under the semiconductor chip 1 is heated under pressure is the external pressure by the pressure film 10b. While suppressing, the curing of the insulating resin film 5 proceeds.
- the deformation load of the bump 2 is about 50 g per bump. The load is controlled according to the size of the bump 2. In this case, the bump height is set to 25 ⁇ mt in consideration of reliability. Further, if necessary, the heating / pressurizing stage 8 may be heated or cooled to control the internal pressure applied to the insulating resin film 5 to suppress the generation of voids.
- FIG. 8D shows a flip chip mounting body obtained by releasing after the insulating resin film 5 is cured by the external pressure of the pressure film 10b.
- FIG. 7B is executed to irradiate the tool protection sheet 10 with UV light 17, and then the processed product shown in FIG. 1C is conveyed to the pressure heating stage 8 to be pressurized and heated.
- sucks to the pressurization heating stage 8 and the irradiation process of the UV light 17 to the tool protection sheet 10 are performed in parallel
- the manufacturing tact can be shortened.
- the insulating resin film 5 can be cured.
- the semiconductor chip 1 can be uniformly pressurized from above and pressurized by the pressure heating tool 11. Moreover, it can be cured with a short lead time. Furthermore, when the closed space 14 is vaporized and expanded, the pressure film 10b can be cured while applying external pressure while being pressed against the insulating resin film 5. As a result, since the tool protection sheet 10 is a thin sheet, it can be bent flexibly unlike rubber, the fillet portion 19 of the insulating resin film 5 around the semiconductor chip 1 can be reduced, and generation of voids can be suppressed. it can.
- the tool protection sheet 10 has a two-layer film structure of a base film 10a and a pressure film 10b, and a UV curable adhesive 15 is formed between the base film 10a and the pressure film 10b.
- 10a was a light-shielding film
- the pressure film 10b was a UV-transmitting film.
- the tool protection sheet 10 of the fifth embodiment shown in FIGS. 9 and 10 (a) and 10 (b) is a base film 10a.
- the pressure film 10b and the shield film 18 have a three-layer film structure, and a UV curable adhesive 15 is formed between the base film 10a and the pressure film 10b.
- the separated shield film 18 is bonded with the weak adhesive layer 24.
- the shield film 18 may be formed by depositing a metal such as aluminum on a heat resistant resin film such as polyimide that can withstand the maximum temperature during the process.
- the base film 10a is composed of a UV transmissive film.
- Such a tool protection sheet 10 is held by a sheet fixing jig 9.
- FIG. 10A is a plan view of the tool protection sheet 10 viewed from the base film 10a side, and FIG. 10B is a side view of FIG. 10A.
- a light shielding mask 16 is disposed on a portion of the tool protection sheet 10 where the semiconductor chip 1 on the base film 10 a side is substantially heated and pressed, and UV light 17 is irradiated from the base film 10 side to add to the base film 10 a. Adhesion with the pressure film 10b is lowered. As the pressure film 10b, a light-shielding film that is UV-cut on the pressure film 10b side may be used so as not to be exposed to light.
- the tool protection sheet 10 is configured such that only the portion used for thermal pressing is exposed from a guide (not shown) supplied to the sheet fixing jig.
- FIG. 11A the processed product shown in FIG. 1C is conveyed to the pressure heating stage 8 and the back surface of the wiring board is adsorbed to the pressure heating stage 8.
- the tool protection sheet 10 including the shield film 18 shown in FIG. 9 is positioned and disposed above the semiconductor chip 1.
- the pressure film 10b side of the tool protection sheet 10 is peeled off by the sheet fixing jig 9, and the pressure film 10b is bent.
- the pressure film 10b is easily peeled off from the base film 10a whose adhesive strength is reduced by the irradiation of the UV light 17, and the roller 27 of the sheet fixing jig 9 is rotated to the semiconductor chip 1 side.
- the film is loosened toward the center portion of the tool protection sheet 10 by peeling the film with the pressure film.
- the thickness and adhesive strength of the UV curable adhesive may be selected and controlled so that the closed space is easily formed by the film peeling operation of the sheet fixing jig 9.
- FIG. 11B shows a plan view of FIG. 11A.
- four rollers 27 of the sheet fixing jig 9 are arranged so as to surround the outer periphery of the semiconductor chip 1. This also applies to the roller 27 of the sheet fixing jig 9 in the fourth embodiment.
- the tool protection sheet 10 is lowered while being clamped by the sheet fixing jig 9 so as to be in contact with the semiconductor chip 1, and at the same time, the tool protection sheet 10 is pressed against the semiconductor chip 1 with the pressure heating tool 11.
- the semiconductor chip 1 is heated under pressure.
- the slack of the pressure film 10b is formed as a bulge around the semiconductor chip 1.
- the tool protection sheet 10 is disposed so as to be inclined to the vicinity of the wiring board 6 by the sheet fixing jig 9.
- the outer periphery of the pressurizing / heating tool 11 is inclined toward the insulating resin film 5 which becomes the fillet portion 19 around the semiconductor chip 1 as shown in FIG. 12A.
- the heat of the pressure heating tool 11 can be transmitted to the tool protection sheet 10 more quickly.
- the closed space 14 between the base film 10a and the pressure film 10b is heated and expanded by the heat from the pressure heating tool 11. Then, the shield film 18 is pressed against the fillet portion 19 to be in close contact therewith.
- the pressure film 10b swells in a space surrounded by the pressure heating tool 11, the sheet fixing jig 9, and the wiring board 6,
- the insulating resin film 5 protruding from the end of the semiconductor chip 1 is formed while pressing the fillet portion 19 of the semiconductor chip 1 with a shield film 18 from the side surface while applying pressure to the insulating resin film 1 below the semiconductor chip 1.
- the insulating resin film 5 is cured while suppressing the internal pressure of the state in which the pressure 5 is heated by the external pressure of the pressure film.
- 12B is a plan view of FIG. 12A.
- the pressurizing and heating tool 11 is further lowered and the tool protection sheet 10 is heated, so that the closed space 14 between the base film 10a and the pressurizing film 10b is further thermally expanded.
- the tool protection sheet 10 is clamped and fixed by the sheet fixing jig 9, and the height of the bump 2 of the semiconductor chip 1 is brought close to a desired value by the pressure heating tool 11.
- the closed space 14 expands into the space surrounded by the pressure heating tool 11, the sheet fixing jig 9, and the wiring substrate 6, the pressure film 10b expands, and the shield film 18 protrudes from the end of the semiconductor chip 1. While pressing against the fillet portion 19 and being partially embedded in the insulating resin film 5, it is pressed and brought into close contact with pressure from the side surface direction.
- the insulating resin film 5 is cured while suppressing the internal pressure when the insulating resin film 5 under the semiconductor chip 1 is heated under pressure by the external pressure by the pressure film 10b.
- the deformation load of the bump 2 is about 50 g per bump.
- the load is controlled according to the size of the bump 2. In this case, the bump height is set to 25 ⁇ mt in consideration of reliability.
- the heating and pressurizing stage 8 may be heated or cooled to control the internal pressure applied to the insulating resin film 5 and suppress the generation of voids.
- FIG. 13B is a cross-sectional view showing a flip chip mounting body in which a semiconductor chip obtained by curing and releasing the insulating resin film 5 with an external pressure by the pressure film 10 b is covered with a shield film 18.
- FIG.13 (c) is a top view of FIG.13 (b).
- the insulating resin film 5 can be cured.
- the semiconductor chip 1 can be uniformly pressurized from above and pressurized by the pressure heating tool 11. Moreover, it can be cured with a short lead time. Furthermore, when the closed space 14 is vaporized and expanded, the pressure film 10b can be cured while applying external pressure while being pressed against the insulating resin film 5. As a result, since the tool protection sheet 10 is a thin sheet, it can be bent flexibly unlike rubber, and the fillet portion 19 of the peripheral insulating resin film 5 of the semiconductor chip 1 can be reduced, thereby suppressing the generation of voids. Can do.
- the shield film 18 has a metal coating, it can block electromagnetic waves and the like, and if it is a resin, the flip chip mounting structure is highly reliable against external forces and adverse environments including the top and side surfaces of the semiconductor chip. be able to.
- the base film 10a is preferably a heat resistant film.
- a heat resistant film for example, polyimide, polyphenylene sulfide, fluorine resin and the like.
- the pressure film 10b a film having heat resistance (NCF curing temperature or higher) is also desirable.
- NCF curing temperature or higher for example, polyimide, polyphenylene sulfide, fluorine resin and the like.
- the base film 10a and the pressure film 10b have a thickness of about 5 to 10 ⁇ m.
- the shield film 18 may be an insulating metal thin film or a conductive metal thin film that has been insulation coated. Further, in addition to electrical shielding, a resin film having insulating properties, heat resistance, low water absorption, and gas barrier properties may be used depending on reliability applications. By using this resin film, it is possible to improve the reliability of mechanical and moisture resistance due to heat and stress in addition to the adhesion between the semiconductor chip 1 and the insulating resin film 5.
- the pressure film 10b is partially peeled in FIG. 11A.
- the process is performed in a step before the step of transporting the processed product to the pressure heating stage 8 and adsorbing the workpiece to the pressure heating stage 8. This is preferable because the process tact time is shortened.
- the UV curable adhesive 15 is provided between the base film 10a and the pressure film 10b.
- a slightly tacky adhesive may be provided instead of the UV curable adhesive 15. .
- the shield film 18 is bonded to the pressure film 10b with the weak adhesive layer 24.
- the shield film 18 may be adhered to the pressure film 10b by static electricity.
- the material enclosed therein in the process of forming the closed space, was only thermally expanded, but the material enclosed therein was thermally expanded, and forcibly.
- the size and growth of the closed space may be controlled by injecting gas.
- the shield film 18 is attached to the tool protection sheet 10 side, and the shield film 18 is moved to the semiconductor chip 1.
- the shield film 18 is pasted on the semiconductor chip 1 via a slightly adhesive resin, and then the semiconductor chip 1 is mounted on the first to fourth embodiments. It can also be realized by heat pressing with the tool protection sheet 10 as described above.
- the present invention can be used for a small and thin semiconductor device in which a semiconductor element is flip-chip mounted on a multilayer circuit board.
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Abstract
Description
図1,図2A,図2B,図3は本発明の実施の形態1を示す。
図1と図4は本発明の実施の形態2を示す。
図1と図5および図6は本発明の実施の形態3を示す。
図1と図7および図8は本発明の実施の形態4を示す。
図1と図9,図10,図11A,図11B,図12A,図12B,図13は本発明の実施の形態5を示す。
Claims (9)
- 熱硬化性のアンダーフィル樹脂を半導体チップと配線基板の間に介在させて半導体チップを配線基板にフリップチップ実装するに際し、
前記配線基板と前記半導体チップの間に熱硬化性のアンダーフィル樹脂を挟んで位置決め配設された前記半導体チップを、少なくともベースフィルムと加圧フィルムの2層フィルム構造からなるツール保護シートの上から加圧加熱し、前記半導体チップ下の前記アンダーフィル樹脂を硬化させながら、前記半導体チップの直上の加圧部以外の前記ツール保護シートから前記加圧フィルムを分離させ、前記分離した加圧フィルムが前記半導体チップの周囲の前記アンダーフィル樹脂に膨らみながら当接し加圧加熱しながら硬化させて、前記配線基板に前記半導体チップを固定させる
フリップチップ実装方法。 - 前記ツール保護シートは、ベースフィルムと加圧フィルムの間に、固体、液体、気体の少なくともひとつ以上を密封してなる
請求項1に記載のフリップチップ実装方法。 - 熱硬化性のアンダーフィル樹脂を半導体チップと配線基板の間に介在させて半導体チップを配線基板にフリップチップ実装するに際し、
前記配線基板と前記半導体チップの間に熱硬化性のアンダーフィル樹脂を挟んで位置決め配設された前記半導体チップを、ベースフィルムと加圧フィルムと前記加圧フィルムに貼り付けられたシールドフィルムの3層フィルム構造からなるツール保護シートの上から加圧加熱し、前記半導体チップ下の前記アンダーフィル樹脂を硬化させながら、前記半導体チップの直上の加圧部以外の前記ツール保護シートから前記加圧フィルムを分離させ、前記分離した加圧フィルムが前記シールドフィルムを介して前記半導体チップの周囲の前記アンダーフィル樹脂に膨らみながら当接し加圧加熱しながら硬化させて、前記配線基板に前記半導体チップを固定させるとともに、前記シールドフィルムを前記半導体チップの側に接着する
フリップチップ実装方法。 - 前記ツール保護シートは、ベースフィルムと加圧フィルムの間に、固体、液体、気体の少なくともひとつ以上を密封してなる
請求項3に記載のフリップチップ実装方法。 - 少なくともベースフィルムと加圧フィルムの2層フィルム構造からなり、加熱すると加圧されていない部分の前記加圧フィルムが前記ベースフィルムから分離して膨らむように構成した
ツール保護シート。 - 前記ベースフィルムと加圧フィルムの間に、固体、液体、気体の少なくともひとつ以上を密封してなる
請求項5に記載のツール保護シート。 - 少なくともベースフィルムと加圧フィルムと前記加圧フィルムに貼り付けられたシールドフィルムの3層フィルム構造からなり、加熱すると加圧されていない部分の前記加圧フィルムが前記ベースフィルムから分離して膨らむように構成した
ツール保護シート。 - 前記ベースフィルムと加圧フィルムの間に、固体、液体、気体の少なくともひとつ以上を密封してなる
請求項7に記載のツール保護シート。 - 熱硬化性のアンダーフィル樹脂を半導体チップと配線基板の間に介在させて半導体チップを配線基板にフリップチップ実装するフリップチップ実装装置であって、
少なくともベースフィルムと加圧フィルムの2層フィルム構造または少なくともベースフィルムと加圧フィルムと前記加圧フィルムに貼り付けられたシールドフィルムの3層フィルム構造のツール保護シートを保持して前記配線基板と前記半導体チップの間に熱硬化性のアンダーフィル樹脂を挟んで位置決め配設された前記半導体チップとその周囲に被せるシート固定治具と、
前記半導体チップを前記配線基板に加熱しながら押圧するとともに、前記シート固定治具の内周部と前記半導体チップの外周部分の間の前記ツール保護シートを、前記熱硬化性のアンダーフィル樹脂の外周部分に押圧する突部が形成された加圧加熱ツールと
を設けた
フリップチップ実装装置。
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US12/933,819 US8163599B2 (en) | 2008-04-18 | 2009-03-30 | Flip-chip mounting method, flip-chip mounting apparatus and tool protection sheet used in flip-chip mounting apparatus |
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KR102459794B1 (ko) * | 2020-05-25 | 2022-10-28 | 이주호 | 반도체 패키지의 전자파 차폐막 형성 방법 |
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KR102619955B1 (ko) | 2020-07-16 | 2024-01-02 | 가부시키가이샤 신가와 | 실장 장치 |
US11978717B2 (en) | 2021-03-12 | 2024-05-07 | Kioxia Corporation | Semiconductor manufacturing apparatus |
WO2023062671A1 (ja) * | 2021-10-11 | 2023-04-20 | 株式会社レゾナック | 電子部品装置の製造方法、電子部品の実装方法及び緩衝シート |
CN116631917B (zh) * | 2023-07-19 | 2023-12-19 | 江苏快克芯装备科技有限公司 | 气压膜压接装置 |
Also Published As
Publication number | Publication date |
---|---|
US20110020983A1 (en) | 2011-01-27 |
US8163599B2 (en) | 2012-04-24 |
JP5208205B2 (ja) | 2013-06-12 |
JPWO2009128206A1 (ja) | 2011-08-04 |
CN101960578B (zh) | 2013-01-02 |
CN101960578A (zh) | 2011-01-26 |
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