WO2022249388A1 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- WO2022249388A1 WO2022249388A1 PCT/JP2021/020165 JP2021020165W WO2022249388A1 WO 2022249388 A1 WO2022249388 A1 WO 2022249388A1 JP 2021020165 W JP2021020165 W JP 2021020165W WO 2022249388 A1 WO2022249388 A1 WO 2022249388A1
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- semiconductor device
- substrate
- dicing
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- thickness
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 104
- 239000004020 conductor Substances 0.000 claims abstract description 98
- 239000000758 substrate Substances 0.000 claims abstract description 59
- 238000000465 moulding Methods 0.000 claims abstract description 35
- 239000011159 matrix material Substances 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract 2
- 239000012778 molding material Substances 0.000 claims description 7
- 230000000903 blocking effect Effects 0.000 claims 1
- 230000017525 heat dissipation Effects 0.000 description 19
- 230000000052 comparative effect Effects 0.000 description 17
- 238000005520 cutting process Methods 0.000 description 17
- 238000001721 transfer moulding Methods 0.000 description 11
- 238000012986 modification Methods 0.000 description 10
- 230000004048 modification Effects 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 230000020169 heat generation Effects 0.000 description 5
- 238000009434 installation Methods 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000010949 copper Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000000567 greater sac Anatomy 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000007261 regionalization Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
- H01L23/367—Cooling facilitated by shape of device
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/12—Mountings, e.g. non-detachable insulating substrates
- H01L23/13—Mountings, e.g. non-detachable insulating substrates characterised by the shape
-
- 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
- H01L23/3107—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape the device being completely enclosed
- H01L23/3121—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape the device being completely enclosed a substrate forming part of the encapsulation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/6835—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2221/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof covered by H01L21/00
- H01L2221/67—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere
- H01L2221/683—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L2221/68304—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
- H01L2221/68345—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support used as a support during the manufacture of self supporting substrates
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2221/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof covered by H01L21/00
- H01L2221/67—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere
- H01L2221/683—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L2221/68304—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
- H01L2221/68359—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support used as a support during manufacture of interconnect decals or build up layers
Definitions
- This application relates to semiconductor devices.
- One method of manufacturing a semiconductor device is mold packaging, in which a large number of semiconductor elements are mounted on a circuit board, sealed together with resin using a molding die, and then divided into desired individual piece sizes by dicing. (See Patent Document 1, for example).
- the present application discloses a technique for solving the above problems, and aims to obtain a semiconductor device that is inexpensive and has high heat dissipation.
- a plurality of cavity structures are formed in a matrix by a substrate in which a plurality of openings are arranged in a matrix and a back conductor arranged on the back side of the substrate, and among the back conductors,
- the back conductor forms a portion that becomes an electrode for electrical connection with the outside corresponding to each of the plurality of cavity structures, and a dicing line that divides each of the cavity structures into individual pieces. and is located at a position closer to the dicing line than the heat sink and the electrode, and functions as a support portion interposed between the molding die and the substrate during integral molding with the molding material.
- the back conductor forms a portion that becomes an electrode for electrical connection with the outside corresponding to each of the plurality of cavity structures, and
- the supporting portion interposed between the substrate and the mold is formed by the back electrode, so that the semiconductor device can be manufactured at low cost and with high heat dissipation. Obtainable.
- FIG. 1A and 1B are an end view and a bottom view, respectively, of a molded product before cutting out individual pieces of the semiconductor device according to the first embodiment.
- 1 is a cross-sectional view of an individual piece of a semiconductor device according to a first embodiment
- FIG. 3A and 3B are cross-sectional views of individual pieces of semiconductor devices according to comparative examples having different thicknesses of backside conductors.
- FIG. 4 is a diagram in the form of a line graph showing the relationship between the thickness of the backside conductor of the semiconductor device and the temperature during operation
- 5A and 5B are a cross-sectional view and a bottom view, respectively, of a molded product before cutting out individual pieces of a semiconductor device according to a comparative example.
- FIG. 6A and 6B are cross-sectional views of the interior of a molding die when producing a molded product of a semiconductor device according to a comparative example using back-surface conductors with different thicknesses.
- 7A and 7B are end views showing states before and during installation in a molding die, respectively, for explaining the arrangement of a back conductor when producing a molded product of a semiconductor device according to a comparative example.
- FIG. 11 is a bottom view of a molded product before cutting out individual pieces of a semiconductor device according to a comparative example; FIG.
- 11 is a bottom view of a molded product before cutting out individual pieces of a semiconductor device according to a comparative example
- 10A and 10B are a cross-sectional view and a bottom view, respectively, of a dicing line in a mold when producing a molded product of a semiconductor device according to a comparative example
- 11A to 11C are cross-sectional views along a dicing line in a molding die when producing a molded product of a semiconductor device according to a comparative example using back-surface conductors with different thicknesses.
- 12A to 12D are bottom views of a molded product before cutting out individual pieces of the semiconductor device according to the first embodiment having supporting portions with different patterns.
- 13A and 13B are an end view and a bottom view, respectively, of a molded product before cutting out individual pieces of the semiconductor device according to the second embodiment.
- 14A and 14B are an end view and a bottom view, respectively, of a molded product before cutting out individual pieces of a semiconductor device according to a modification of the second embodiment.
- 15A to 15D are bottom views of molded products before individual pieces of the semiconductor device according to the second embodiment having support portions with different patterns are cut out.
- 16A and 16B are a cross-sectional view and a bottom view, respectively, of a molded product before cutting out individual pieces of the semiconductor device according to the third embodiment.
- 17A to 17D are bottom views of a molded product before cutting out individual pieces of a semiconductor device according to the third embodiment having supporting portions with different patterns.
- FIGS. 1A, 1B, and 2 are for explaining the configuration of the semiconductor device according to the first embodiment, and FIG. 1B shows a molded product before cutting out individual pieces of the semiconductor device as viewed from the back conductor side.
- FIG. 1A is an end view corresponding to line AA of FIG. 1B of the molded article.
- FIG. 2 is a cross-sectional view corresponding to the individual piece portion of FIG. 1A of a semiconductor device produced using a back-surface conductor having a thickness necessary to ensure heat dissipation.
- the bottom view including FIG. 1B does not show a cross section, the supporting portion is hatched in order to distinguish between the back conductor and the supporting portion.
- FIGS. 3A and 3B, and FIGS. 4 to 11C are for explaining comparative examples for explaining the effects of the semiconductor device of the present application, and FIGS. 3A and 3B each have a different thickness of the back conductor.
- FIG. 3 is a cross-sectional view corresponding to FIG. 2 , omitting a molding material portion of a semiconductor device according to a comparative example;
- FIG. 4 is a diagram in the form of a line graph showing the relationship between the thickness of the backside conductor and the chip temperature when a semiconductor device including the semiconductor device of the present application is operated.
- FIG. 5B is a bottom view of the molded product before cutting out individual pieces of the semiconductor device shown in FIG. 4, viewed from the back conductor side
- FIG. 5A is a cross-sectional view of the molded product corresponding to line BB in FIG. 5B.
- 6A and 6B show that when a molded product of a semiconductor device according to a comparative example using back-surface conductors with different thicknesses is produced, the molded product is set in a transfer molding die and molded by transfer molding.
- FIG. 7B is a cross-sectional view corresponding to line BB of FIG. 5B showing a state in which a resin is filled
- FIG. 5C is an end view corresponding to the CC line in FIG. 5B showing the state before and during installation in the molding die, respectively, for explaining the arrangement;
- FIG. 8 is a bottom view for explaining the state of the intersections of the dicing lines in the molded product before individual pieces of the semiconductor device according to the comparative example are cut out
- FIG. 9 is a support portion arranged at the intersections of the dicing lines.
- FIG. 11 is a bottom view of a molded product before cutting out individual pieces of a semiconductor device according to a comparative example as described above.
- 10A and 10B show the lateral direction (x direction) and a cross-sectional view along a dicing line. Further, FIGS.
- FIG. 4 is a cross-sectional view taken along a dicing line running in the lateral direction within the molding die;
- a semiconductor device 100 of the present application integrates a substrate 2 having a plurality of openings arranged in a matrix and a back conductor 5 arranged on the back side of the substrate 2 to form a plurality of openings.
- Cavity structures are formed in a matrix in which they are arranged vertically and horizontally.
- a semiconductor chip semiconductor element 4 is mounted using the back surface conductor 5 exposed from the substrate 2 as a recess when viewed from the front side of the substrate 2 as a heat sink 5h.
- the electronic component 3 mounted on the substrate 2 is electrically connected to the bonding wire 7 or the like, and the mold material 1 that seals the mounting surface of the semiconductor element 4 is integrally molded. It is a product.
- the back conductor 5 also has a portion functioning as an electrode 5e exposed on the back side for electrical connection with the electronic component 3, the semiconductor element 4, etc. inside and electrically connected to the outside. formed.
- the feature of the semiconductor device 100 of the present application is that, as a molded product before being cut into individual pieces 10, the supporting portion is separated from the back conductor 5 by pattern formation and is arranged at a position closer to the dicing line Ld than the back conductor 5. 6 is provided.
- the back conductor 5 including the supporting portion 6 has a thickness t5 of 50 ⁇ m or more (more preferably 100 ⁇ m or more).
- a general semiconductor device having a matrix-shaped cavity structure will be described using a comparative example. It should be noted that it is the individual piece 10 after being cut out corresponding to each cavity structure that is distributed for mounting in electronic equipment, and in general, the individual piece 10 can be called a semiconductor device. many.
- the semiconductor device 100 refers to an integrally molded product in which a plurality of cavity structures are formed in a matrix before the individual pieces 10 are separated.
- semiconductor devices having different thicknesses t5 of the back conductor 5 are set as shown in FIGS. 3A and 3B. did.
- the semiconductor devices in the comparative example parts corresponding to the semiconductor device of the present application but having specifications different from those of the semiconductor device of the present application are distinguished by adding "C" to the end of the reference numeral.
- the thickness t5 of the back conductor 5 was used as a parameter, the relationship between the thickness t5 and the chip temperature Tc, which is determined by the balance between heat generation and heat dissipation during operation, was obtained by simulation. The results are shown in FIG. Note that the temperature on the vertical axis in FIG. 4 is on a linear scale.
- the chip temperature Tc decreases as the thickness t5 increases, and that the chip temperature Tc can be suppressed to the first threshold value Th1 or less by increasing the thickness t5 to 50 ⁇ m or more. Furthermore, by setting the thickness t5 to 100 ⁇ m or more, the chip temperature Tc can be suppressed to the second threshold Th2 or less, which is lower than the first threshold Th1, and even if there are variations in the element characteristics, the chip temperature Tc can be appropriately increased. It was found to be within a certain range.
- circuit boards with high-density wiring use copper (Cu) as a conductor, and the thickness is often around 30 ⁇ m.
- Cu copper
- the heat cannot be spread sufficiently, so the heat radiation performance is limited, and it is difficult to suppress the chip temperature Tc to the first threshold value Th1 or lower as described above.
- it is considered effective to set the thickness t5 of the back conductor 5 constituting the heat sink 5h to 50 ⁇ m or more, preferably 100 ⁇ m or more, in order to ensure the heat dissipation performance and follow the increase in heat generation of the semiconductor element. .
- the semiconductor device 100 (individual piece 10) having high heat dissipation performance as shown in FIG. can be made.
- a molded product (semiconductor device 100C) is divided by dicing along dicing lines Ld to obtain individual pieces 10C of a desired size. can be processed into
- the interval D5 between the backside conductors 5 at the portion sandwiching the dicing line Ld is wider than at other portions.
- a molding pressure of approximately 10 MPa is generally applied. This molding pressure may cause the substrate 2 to deform. Even if stress is applied to the substrate 2 by the molding pressure, the area where the back conductors 5 are arranged or the area where the spacing is narrow does not deform because the back conductors 5 support the substrate 2 from below. On the other hand, in the area where the back conductor 5 is not arranged, there is no structure to support the substrate 2 from below, so there is a possibility that the substrate 2 may be deformed or damaged by the stress due to the molding pressure.
- the substrate 2 since the substrate 2 cannot be supported from below at the portion where the interval D5 between the backside conductors 5 sandwiching the dicing line Ld is large, the substrate 2 is easily pressed by the molding pressure Pm as indicated by the dashed line in FIG. 7B. It transforms into On the other hand, as shown in FIG. 6A, when the thickness t5 is as thin as usual, even if the substrate 2 is deformed during the transfer molding process, it immediately hits the molding die 80, and further deformation is suppressed. The amount of deformation was slight, and there was no noticeable effect on quality. However, if the thickness t5 is large, the amount of deformation of the substrate increases during the transfer molding process, which causes problems such as cracking of the substrate.
- the back conductor 5 is additionally arranged as the support portion 6C in a location where the interval D5 between the back conductors 5 is wide, such as the region including the intersection point Px of the dicing line Ld. Therefore, a method of narrowing the interval D5 can be considered.
- the load on the dicing blade becomes very large. As a result, there is a concern that the dicing blade will wear out rapidly and that the dicing blade will eventually break, so it is difficult to dispose the support portion 6C at the intersection point Px of the dicing lines Ld.
- FIGS. 10A and 10B for example, a method of preventing deformation of the substrate 2 by providing support pins 80p in the molding die 80 to support the circuit substrate can be considered.
- the cost of the mold increases because special processing is required for the molding mold.
- the support pins 80p must be arranged according to the product piece size, it is necessary to create a new mold with a different installation region Rp (region corresponding to the intersection point Px) for each piece size. There is the problem of cost.
- the thickness t5 of the back conductor is subject to manufacturing variations, the height of the support pin 80p is constant, so it is not possible to follow the variation in the thickness of the back conductor.
- a gap Gp (in the z direction) is generated between the support pin 80p and the substrate 2 for a finished circuit board having a thickness t5 larger than the height of the support pin 80p. Since the substrate 2 is not supported by the support, a sufficient effect of preventing deformation of the substrate 2 cannot be obtained.
- the gap Gp between the substrate 2 and the mold 80 is formed by the support pins 80p. is generated and floats, increasing the deformation of the substrate.
- the height of the support pins 80p is adjusted to the finished thickness t5 of the thin backside conductor. Then, as shown in FIG. 11C, the support pins 80p cannot support the substrate 2 when the back conductor thickness is the design center thickness t5.
- the back conductor 5 was patterned so that the support portion 6 was arranged. That is, among the back conductors, other than the back conductor 5 functioning as a semiconductor device (piece 10) such as the heat sink 5h and the electrode 5e, a region closer to the dicing line Ld than the back conductor 5 and not overlapping the dicing line Ld. A support 6 is placed.
- the support portion 6 narrows the distance D5, and even if the back conductor 5 having a thickness t5 of 50 ⁇ m or more, which is excellent in heat dissipation, is used, deformation of the substrate 2 due to the molding pressure Pm during transfer molding is prevented. can do.
- a double dicing line Ld is formed in one division, which increases the number of dicing operations.
- the load applied to the dicing blade is lighter when cutting the portion where the back conductor 5 or the supporting portion 6 is not arranged twice than when cutting the thick back conductor once.
- the portion 90 between the dicing lines Ld formed in duplicate is not used as a product and is discarded. Increased profits outweigh.
- the die processing cost can be suppressed.
- the support portion 6 is formed by dividing the back conductor 5 in a pattern, even if there are variations in thickness between products, the back conductor 5 and the support portion can be formed within one product. Since 6 has the same thickness t5, there is no gap with the molding die 80. In other words, it is possible to solve both the cost problem and the technical problem of the support pin method at the same time.
- FIG. 12A to 12D are bottom views of a molded product before individual pieces of the semiconductor device according to the modification of the first embodiment having supporting portions with different patterns are cut out.
- the shape, size, division number, division shape, and division direction of the support portion 6 are arbitrary. That is, the above-described effect can be obtained by arranging a plurality of rectangular support portions 6 divided along the dicing lines Ld as shown in FIG. 12A in the area surrounded by the dicing lines Ld. can.
- rectangular support portions 6 divided in the direction perpendicular to the dicing line Ld may be arranged.
- a plurality of circular supporting portions 6 divided along the dicing lines Ld may be arranged in the area surrounded by the dicing lines Ld.
- a support portion 6 having a missing portion on the inner side in the plane (xy plane) direction may be arranged.
- a plurality of shapes, a plurality of sizes, a plurality of division numbers, a plurality of division shapes, and division directions may be used in combination.
- Embodiment 2 In the first embodiment, an example has been described in which the dicing line at each boundary between adjacent individual pieces is doubled and a supporting portion is provided between them. In the second embodiment, an example will be described in which only the dicing line at the boundary in one direction among the boundaries between adjacent individual pieces is doubled, and a supporting portion is provided between the dicing lines.
- FIGS. 13A and 13B are for explaining the configuration of the semiconductor device according to the second embodiment, and FIG. 13B is a bottom view of the molded product before cutting out individual pieces of the semiconductor device as viewed from the back conductor side; FIG. 13A is an end view of the molded article corresponding to line DD of FIG. 13B.
- FIGS. 14A and 14B are for explaining the configuration of the semiconductor device according to the modification of the second embodiment
- FIG. 14A is an end view of the molded article corresponding to line EE of FIG. 14B. Except for the arrangement of the supporting portions and the setting of the dicing lines, the configuration is the same as that described in the first embodiment, so description of the same portions is omitted and FIG. 2 is used.
- the substrate 2 and the patterned back conductor 5 are integrated to form a cavity structure, as shown in FIGS. 13A and 13B. is used as a heat sink 5h, and the semiconductor element 4 is mounted thereon.
- the electronic component 3 mounted on the substrate 2 is electrically connected to the bonding wire 7 or the like, and sealed with the molding material 1 .
- the back conductor 5 also has a portion functioning as an electrode 5e that is electrically connected to the electronic component 3, the semiconductor element 4, etc., and is exposed for electrical connection to the outside. ing.
- the thickness t5 of the back conductor 5 constituting the heat sink 5h is set to 50 ⁇ m or more, preferably 100 ⁇ m or more, in order to ensure the heat radiation performance and follow the increase in heat generation of the semiconductor element. .
- the back conductors other than the back conductor 5 functioning as the semiconductor device (piece 10) are closer to the dicing line Ld than the back conductor 5 and do not overlap the dicing line Ld.
- a support 6 is arranged in the region.
- the dicing lines Ld are doubled only in either the vertical or horizontal direction, and the support portion 6 is arranged between them.
- the dicing line Ld is doubled with respect to the boundary in the horizontal (x) direction, and the supporting portion 6 is arranged therebetween.
- the dicing line Ld may be doubled with respect to the boundary in the vertical (y) direction, and the support portion 6 may be arranged between them.
- the distance D5 in either the vertical direction or the horizontal direction of the supporting portion 6 is narrowed, and even if the back conductor 5 having a thickness t5 of 50 ⁇ m or more, which is excellent in heat dissipation, is used, transfer molding is possible. Deformation of the substrate 2 due to the molding pressure Pm at the time of molding can be prevented. Furthermore, in addition to the effects of the first embodiment, since the supporting portions 6 are not provided along the vertical or horizontal direction, the intervals between the individual pieces 10 can be reduced. As a result, the number of pieces that can be obtained from one substrate can be increased, so that the manufacturing cost can be reduced.
- warping in one direction occurs after transfer molding. may be greater than the remaining one-way warpage.
- the warp is caused by stress due to the difference in coefficient of linear expansion between the molding material 1 , the substrate 2 , and the back conductor 5 .
- the stress caused by the difference in the coefficient of linear expansion is reduced, and the warpage is suppressed and reduced. be able to.
- the stress caused by the difference in coefficient of linear expansion can be reduced, and the warpage can be suppressed and reduced.
- the number of times of dicing can be reduced, and the ratio of unnecessary portions 90 can be reduced as compared with the case where the support portions 6 are provided along the boundaries in both the vertical and horizontal directions.
- 15A to 15D are bottom views of molded products before individual pieces of semiconductor devices according to modifications of the second embodiment having support portions with different patterns are cut out. Although each modification shows an example in which the supporting portions are arranged along the dicing lines running in the horizontal direction (x direction), they may be arranged along the dicing lines running in the vertical direction.
- the shape, size, division number, division shape, and division direction of the support portion 6 are arbitrary. That is, the above-described effect can be obtained by arranging a plurality of rectangular support portions 6 divided along the dicing lines Ld as shown in FIG. 15A in the region surrounded by the dicing lines Ld. can. Alternatively, as shown in FIG. 15B, the width may be made wider or narrower than that shown in FIG. 13B.
- a plurality of circular supporting portions 6 divided along the dicing lines Ld may be arranged in the area surrounded by the dicing lines Ld.
- a support portion 6 having a missing portion on the inner side in the plane (xy plane) direction may be arranged.
- a plurality of shapes, a plurality of sizes, a plurality of division numbers, a plurality of division shapes, and division directions may be used in combination.
- Embodiment 3 In Embodiment 1 or 2 above, an example in which the supporting portion is provided between the doubled dicing lines has been described, but the present invention is not limited to this.
- the third embodiment an example will be described in which a supporting portion is arranged at a position where a dicing line is interposed and remains in the divided individual pieces.
- 16A and 16B are for explaining the configuration of the semiconductor device according to the third embodiment, and FIG. 16B is a bottom view of the molded product before cutting out individual pieces of the semiconductor device as viewed from the back conductor side; FIG. 16A is a cross-sectional view of the molded article corresponding to line FF of FIG. 16B. It should be noted that, except for the arrangement of the support portion, it is the same as that described in Embodiment 1 or 2, and the description of the same portion will be omitted.
- the substrate 2 and the patterned back conductor 5 are integrated to form a cavity structure, A semiconductor element 4 is mounted using the conductor 5 as a heat sink 5h.
- the electronic component 3 mounted on the substrate 2 is electrically connected to the bonding wire 7 or the like, and sealed with the molding material 1 .
- the back conductor 5 also has a portion functioning as an electrode 5e that is electrically connected to the electronic component 3, the semiconductor element 4, etc., and is exposed for electrical connection to the outside. ing.
- the thickness t5 of the back conductor 5 constituting the heat sink 5h is set to 50 ⁇ m or more, preferably 100 ⁇ m or more, in order to ensure the heat dissipation performance and follow the increase in heat generation of the semiconductor element. set.
- the back conductors other than the back conductor 5 functioning as the semiconductor device (piece 10) are closer to the dicing line Ld than the back conductor 5 and do not overlap the dicing line Ld.
- a support 6 is arranged in the region.
- the support portions 6 are arranged within the area of the individual piece 10 so as to sandwich the vertical and horizontal boundaries separating the individual pieces 10 . That is, one dicing line Ld is set for one boundary and arranged so as to sandwich the dicing line Ld, particularly at four locations where the vertical and horizontal dicing lines Ld intersect. As in Embodiments 1 and 2, the support portion 6 is pattern-formed at the same time as the backside conductor 5, and is structured so as to remain in each individual piece 10 when divided into individual pieces 10. However, vias and through holes It is not electrically connected, and does not function as a semiconductor device.
- the supporting portion 6 is arranged at a position closer to the dicing line Ld than the back conductor 5, the interval D5 is narrowed.
- the back conductor 5 having a thickness t5 of 50 ⁇ m or more, which is excellent in heat dissipation, is used, deformation of the substrate 2 due to the molding pressure Pm during transfer molding can be prevented.
- the dicing line Ld is not doubled, the intervals between the pieces 10 can be reduced, and the number of pieces obtained per substrate can be increased. , the manufacturing cost can be reduced.
- the shape, size, division number, division shape, and division direction of the support portion 6 arranged in the individual piece 10 are arbitrary. That is, as shown in FIG. 17A, the L-shaped support portions 6 are arranged at the intersections of the dicing lines Ld so as to sandwich the dicing lines Ld. Alternatively, as shown in FIG. 17B, support portions 6 divided along one of the dicing lines Ld may be arranged at intersections of the dicing lines Ld.
- the annular support portions 6 are arranged. good too. Furthermore, a plurality of shapes, a plurality of sizes, a plurality of division numbers, a plurality of division shapes, and division directions may be used in combination.
- the thickness t5 of the back conductor 5 is 50 ⁇ m or more, preferably 100 ⁇ m or more.
- a thickness of 30 ⁇ m or less does not significantly affect the quality.
- the thickness is thin, as long as the cavity structure is used, the heat dissipation is improved, and the portion where the distance D5 is wide is deformed according to the thickness. Shortening is effective for quality improvement.
- the substrate 2 having a plurality of openings arranged in a matrix and the back surface conductor 5 arranged on the back side of the substrate 2 form a plurality of cavity structures in a matrix.
- the portion that closes each of the plurality of openings from the back side functions as a heat sink 5h for mounting the semiconductor element 4, and is integrally molded with the molding material 1 that seals the front side of the substrate 2 including the semiconductor element 4.
- the back conductor 5 forms a portion that becomes an electrode 5e for electrical connection with the outside in addition to the heat sink 5h corresponding to each of the plurality of cavity structures, and each of the cavity structures is disposed away from the dicing line Ld for dividing into individual pieces and at a position closer to the dicing line Ld than the heat sink 5h and the electrode 5e. Since a part functioning as a supporting part 6 interposed therebetween is formed, even if the molding pressure Pm in transfer molding is applied to the substrate 2, the supporting part 6 supports the substrate 2 and prevents deformation. Therefore, it is possible to obtain the semiconductor device 100 that is inexpensive and has high heat dissipation, and thus the piece 10 .
- the supporting portion 6 remains on the piece 10 so as to be placed between the double dicing lines Ld drawn with a space between adjacent pieces. Therefore, the piece 10 can be made compact.
- the double dicing lines Ld are drawn in either the vertical direction (y direction) or the horizontal direction (x direction), compared to the case where both the vertical and horizontal directions are doubled,
- the interval between the individual pieces 10 can be narrowed, and the number of pieces that can be obtained from one substrate can be increased. Also, the number of times of dicing can be reduced.
- the stress caused by the difference in coefficient of linear expansion between the members can be reduced and the warpage can be prevented. Suppression can be reduced.
- the supporting portion 6 is arranged at a position inside the dicing line Ld on each of the individual pieces 10, the distance between the individual pieces 10 can be reduced to the maximum. Since the yield can be increased, manufacturing costs can be reduced. Also, the number of times of dicing can be reduced.
- the thickness t5 of the back conductor 5 (and the support portion 6) is 50 ⁇ m or more, the rise in the chip temperature Tc can be suppressed within an appropriate range.
- the thickness t5 of the backside conductor 5 (and the support portion 6) is 100 ⁇ m or more, the rise in the chip temperature Tc can be reliably suppressed within an appropriate range even if there is variation in the performance of the device.
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Abstract
Description
図1Aと図1B、および図2は、実施の形態1にかかる半導体装置の構成について説明するためのものであり、図1Bは半導体装置の個片を切り出す前の成型品を裏面導体側から見た底面図、図1Aは成形品の図1BのA-A線に対応する端面図である。そして、図2は放熱性を確保するのに必要な厚みを有する裏面導体を用いて作成した半導体装置の図1Aの個片部分に対応する断面図である。なお、図1Bを含めた底面図は、断面を示すものではないが、裏面導体と支持部を区別するため、支持部に対してはハッチングを付している。
なお、ダイシングラインLdを避けて、裏面導体5よりもダイシングラインLd、または隣接する個片10どうしの境界に近い位置への支持部6の配置は、図1Bで説明したパターンに限ることはない。図12A~図12Dは、それぞれパターンが異なる支持部を有する実施の形態1の変形例にかかる半導体装置の個片を切り出す前の成形品の底面図である。
上記実施の形態1においては、隣接する個片同士の各境界のダイシングラインを二重化し、その間に支持部を設けた例について説明した。本実施の形態2では、隣接する個片同士の境界のうち、一方向の境界のダイシングラインのみ二重化し、その間に支持部を設けた例について説明する。図13Aと図13Bは、実施の形態2にかかる半導体装置の構成について説明するためのものであり、図13Bは半導体装置の個片を切り出す前の成型品を裏面導体側から見た底面図、図13Aは成形品の図13BのD-D線に対応する端面図である。
なお、縦、横の一方のダイシングラインLdを二重化して、裏面導体5よりもダイシングラインLd、または隣接する個片10どうしの境界に近い位置への支持部6の配置は、図13B、図14Bで説明したパターンに限ることはない。図15A~図15Dは、それぞれパターンが異なる支持部を有する実施の形態2の変形例にかかる半導体装置の個片を切り出す前の成形品の底面図である。なお、各変形例は横方向(x方向)に走るダイシングラインに沿って支持部を配置した例を示すが、縦方向に沿って走るダイシングラインに沿って配置してもよい。
上記実施の形態1または2においては、二重化したダイシングラインの間に支持部を設ける例について説明したが、これに限ることはない。本実施の形態3においては、ダイシングラインを挟み、分割した個片に残る位置に支持部を配置した例について説明する。図16Aと図16Bは、実施の形態3にかかる半導体装置の構成について説明するためのものであり、図16Bは半導体装置の個片を切り出す前の成型品を裏面導体側から見た底面図、図16Aは成形品の図16BのF-F線に対応する断面図である。なお、支持部の配置以外については、実施の形態1、あるいは2で説明したのと同様であり、同様部分の説明を省略する。
なお、縦横のダイシングラインLdを挟み、ダイシングラインLdを避けた裏面導体5よりもダイシングラインLdに近い位置への支持部6の配置は、図16Bで説明したパターンに限ることはない。図17A~図17Dは、それぞれパターンが異なる支持部を有する実施の形態3の変形例にかかる半導体装置の個片を切り出す前の成形品の底面図である。
Claims (7)
- 複数の開口がマトリクス状に配置された基板と前記基板の裏側に配置された裏面導体とでマトリクス状に複数のキャビティ構造が形成され、前記裏面導体のうち、前記複数の開口それぞれを前記裏側から塞ぐ部分が半導体素子を搭載するヒートシンクとして機能し、前記半導体素子を含む前記基板の表側を封止するモールド材との一体成型品の半導体装置であって、
前記裏面導体は、前記複数のキャビティ構造のそれぞれに対応して、前記ヒートシンクに加え、外部と電気接続するための電極となる部分を形成するとともに、前記キャビティ構造のそれぞれを個片に分割するダイシングラインから離れ、かつ、前記ヒートシンクと前記電極よりも前記ダイシングラインに近い位置に配置され、前記モールド材との一体成型の際に成型金型と前記基板との間に介在する支持部として機能する部分を形成していることを特徴とする半導体装置。 - 前記支持部は、隣接する個片同士の間に間隔をあけて引かれた二重のダイシングラインの間に配置されていることを特徴とする請求項1に記載の半導体装置。
- 前記二重のダイシングラインは、縦方向、横方向のいずれか一方に引かれていることを特徴とする請求項2に記載の半導体装置。
- 前記二重のダイシングラインは、当該半導体装置の短辺に平行な方向に引かれていることを特徴とする請求項3に記載の半導体装置。
- 前記支持部は前記個片それぞれにおける前記ダイシングラインよりも内側の位置に配置されていることを特徴とする請求項1に記載の半導体装置。
- 前記裏面導体の厚みが50μm以上であることを特徴とする請求項1から5のいずれか1項に記載の半導体装置。
- 前記裏面導体の厚みが100μm以上であることを特徴とする請求項6に記載の半導体装置。
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH07193168A (ja) * | 1993-12-27 | 1995-07-28 | Mitsubishi Electric Corp | パッケージ部品の製造方法、ヒートスプレッダの形成方法、及び無電解めっき膜の形成方法 |
JP2001110830A (ja) * | 1999-10-08 | 2001-04-20 | Denso Corp | 樹脂封止型半導体装置およびその製造方法 |
JP2002118213A (ja) * | 2000-10-05 | 2002-04-19 | Sanyo Electric Co Ltd | 半導体装置および半導体モジュール |
WO2019198199A1 (ja) * | 2018-04-12 | 2019-10-17 | 三菱電機株式会社 | 半導体装置 |
WO2020012598A1 (ja) * | 2018-07-12 | 2020-01-16 | 三菱電機株式会社 | 半導体装置 |
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH07193168A (ja) * | 1993-12-27 | 1995-07-28 | Mitsubishi Electric Corp | パッケージ部品の製造方法、ヒートスプレッダの形成方法、及び無電解めっき膜の形成方法 |
JP2001110830A (ja) * | 1999-10-08 | 2001-04-20 | Denso Corp | 樹脂封止型半導体装置およびその製造方法 |
JP2002118213A (ja) * | 2000-10-05 | 2002-04-19 | Sanyo Electric Co Ltd | 半導体装置および半導体モジュール |
WO2019198199A1 (ja) * | 2018-04-12 | 2019-10-17 | 三菱電機株式会社 | 半導体装置 |
WO2020012598A1 (ja) * | 2018-07-12 | 2020-01-16 | 三菱電機株式会社 | 半導体装置 |
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