WO2008035614A1 - Module à semi-conducteur et procédé de fabrication du module à semi-conducteur - Google Patents
Module à semi-conducteur et procédé de fabrication du module à semi-conducteur Download PDFInfo
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- WO2008035614A1 WO2008035614A1 PCT/JP2007/067841 JP2007067841W WO2008035614A1 WO 2008035614 A1 WO2008035614 A1 WO 2008035614A1 JP 2007067841 W JP2007067841 W JP 2007067841W WO 2008035614 A1 WO2008035614 A1 WO 2008035614A1
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- sheet member
- conductive sheet
- semiconductor element
- semiconductor module
- heat
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- H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
- H01L23/367—Cooling facilitated by shape of device
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Definitions
- the present invention relates to a semiconductor module including a semiconductor element and an electronic component, and a method for manufacturing the same.
- a semiconductor power element semiconductor element that generates heat as a result of the operation of the semiconductor power module and becomes a high temperature as a result
- thermal design has been carried out such as bringing the semiconductor power element into contact with the package substrate (cooling medium). Therefore, when configuring a semiconductor power module using a plurality of semiconductor power devices, it must force s contacting the respective semiconductor power device package substrate.
- Semiconductor power modules include a module in which a semiconductor power element and a control circuit that controls the semiconductor power element or a passive element such as a capacitor are mounted on the same package substrate.
- Patent Document 1 discloses a power converter in which a main circuit (semiconductor element) 83 and a control circuit 82 are accommodated in the same package (housing) 81 as shown in FIGS. (Semiconductor module) 80 is disclosed.
- a plate-shaped shielding member 88 is inserted between the main circuit 83 and the control circuit 82, thereby shielding the heat and electromagnetic noise generated by the main circuit 83. Is done.
- the shielding member 188 formed in a U-shape is arranged in the casing 81 so as to divide the casing 81 into two parts.
- the configuration is also disclosed! In this configuration, the shielding member 188 completely covers the main circuit 83 that generates heat. Further, the shielding member 188 has a through hole, and a signal for electrically connecting the control circuit 82 or the passive element and the semiconductor power element existing outside the shielding member 188 to the through hole.
- a line 189 or a signal line 189 for supplying a control signal from the control circuit 82 or the passive element existing outside the shielding member 188 to the semiconductor power element passes.
- Patent Document 1 Japanese Patent Laid-Open No. 2005-235929
- the temperature of each semiconductor power element is sufficiently radiated and the semiconductor power elements are separated from each other and arranged with a gap between them. It is necessary to prevent the rise. Therefore, the mounting surface of the package base material needs to be larger than the area obtained by adding the areas of the lower surfaces of the semiconductor power elements. Therefore, the package becomes very large, and it is difficult to reduce the size of the semiconductor power module.
- the semiconductor power module in which a semiconductor power element and a control circuit or a passive element are mounted on the same package base material, in preparation for a case where the temperature of the mounted component rises due to the operation of the semiconductor power module, It is preferable that all mounted components be operable at the upper limit of the guaranteed temperature range of semiconductor power devices.
- the upper limit is, for example, about 120 ° C, and there are limited control circuits or passive elements that can operate at such high temperatures. Therefore, the selection range of components to be mounted becomes narrow, and the semiconductor power module cannot be freely designed.
- a control circuit or a passive element that can operate even at a high temperature may be expensive, which increases the cost of the semiconductor power module.
- the present invention has been made in view of the force, and the purpose thereof is to keep a capacitor or a control circuit at a low temperature even when the semiconductor element generates heat and becomes high temperature.
- An object of the present invention is to provide a semiconductor module.
- a semiconductor module of the present invention includes a cooling medium having a mounting surface, a semiconductor element mounted on the mounting surface and generating a relatively large amount of heat during operation, and mounted on the mounting surface. And an electronic component that generates relatively little heat during operation, and a heat conductive sheet member that covers a part of the target component that is one of the semiconductor element and the electronic component.
- the thermally conductive sheet member has a lower part that is in contact with the mounting surface and a side part that extends from the lower part and covers the first side surface of the target component, and the surface area of the lower part is 1 of the surface area of the thermally conductive sheet member. / 5 or more. Further, the other part different from the target part is arranged on the opposite side of the target part with the side portion of the heat conductive sheet member interposed therebetween.
- the heat of the cooling medium (cooling heat) is transmitted to the entire heat conductive sheet member via the lower part. Thereby, heat separation can be performed efficiently. Further, when the target component is a semiconductor element, an increase in the temperature of the heat conductive sheet member due to heat generation of the semiconductor element can be suppressed.
- the surface area of the lower part of the heat conductive sheet member is 1/5 or more of the surface area of the heat conductive sheet member, the heat of the cooling medium (cooling heat) is efficiently transmitted to the entire heat conductive sheet member. Achieving power S
- “covering a part of the target part” means that the surface of the target part is merely disposed so as to be in contact with a part of the target part of the heat conductive sheet member force. It also means that they are placed away! /.
- thermal separation means that heat exchange between the semiconductor element and the electronic component is suppressed and shielded. Specifically, the semiconductor element is generated. The transmission of heat to electronic components is small.
- “another part different from the target part” is an electronic part when the target part is a semiconductor element, and is a semiconductor element when the target part is an electronic part.
- the thermal conductivity of the thermally conductive sheet member is 400 W / (m. K) or more is preferred. More preferably, the thermally conductive sheet member is a graph item sheet.
- the thermally conductive sheet member may further have an upper portion extending from the side portion and covering at least a part of the upper surface of the target component.
- the lower part of the heat conductive sheet member is sandwiched between the mounting surface and the lower surface of the target component.
- it further includes an electrode terminal and a conductive thin wire, and the conductive thin wire extends from the target part between the upper part and the lower part of the heat conductive sheet member and out of the heat conductive sheet member. Connected to the electrode terminal!
- the lower portion of the heat conductive sheet member is disposed between the target component and the other component on the mounting surface.
- an electrode terminal and a conductive thin wire are further provided, and the conductive thin wire extends from the target component between the upper portion of the heat conductive sheet member and the mounting surface and out of the heat conductive sheet member.
- the electrode terminal may be connected.
- the semiconductor module of the present invention preferably includes an insulating member interposed between the target component and the heat conductive sheet member. As a result, the force S prevents the short circuit between the target part and the heat conductive sheet member.
- the electronic component may be arranged above the upper surface of the semiconductor element.
- the semiconductor module of the present invention further includes a heat sink arranged between the mounting surface and the lower surface of the semiconductor element.
- the force S can be used to release the heat generated by the semiconductor element.
- the thermally conductive sheet member is mounted such that the first portion having an area of 1/5 or more of the surface area contacts the mounting surface of the cooling medium.
- a step (a) of disposing the target component on the surface, a step (b) of mounting the target component that is one of the semiconductor element and the electronic component on the first portion of the thermal conductive sheet member, and the thermal conductive sheet member The step (c) of bending the heat conductive sheet member so that the second part of the target part covers the first side surface of the target part, and the other part different from the target part to the target part And (d) mounting on the opposite side across the second part of the member.
- the second method for manufacturing a semiconductor module of the present invention includes a step (a) of mounting a target component that is one of a semiconductor element and an electronic component on a mounting surface of a cooling medium,
- the heat conductive sheet member is bent so that the first part having an area of 5 or more is in contact with the mounting surface of the cooling medium and the second part covers the first side surface of the target part.
- the thermally conductive sheet member can be disposed in contact with a part of the cooling medium. A part of the target part can be covered. Therefore, it is possible to provide a semiconductor module that performs heat separation efficiently.
- the heat conductive sheet member is mounted on the mounting surface such that the first portion having an area of 1/5 or more of the surface area contacts the mounting surface of the cooling medium.
- the fourth method for manufacturing a semiconductor module of the present invention includes a step ⁇ of mounting a semiconductor element on a mounting surface of a cooling medium and disposing an electronic component above the upper surface of the semiconductor element, and a surface area of the semiconductor element.
- the heat conductive sheet member is bent so that the first part having an area of 1/5 or more is in contact with the mounting surface of the cooling medium and the second part covers at least part of the upper surface of the semiconductor element. And (b) disposing a conductive sheet member on the cooling medium.
- the heat conductive sheet member can be disposed in contact with a part of the cooling medium. A part of the semiconductor element can be covered. Therefore, it is possible to provide a semiconductor module that efficiently performs heat separation.
- a sheet portion made of a material having a thermal conductivity of 400 W / (m * K) or more is used as the thermally conductive sheet member. It is preferable to use a material.
- the semiconductor element even when a control circuit, a passive element, or the like generates a small amount of heat and an electronic component is mounted on the same cooling medium as the semiconductor element, the semiconductor element generates heat and becomes high temperature. Electronic components can be kept at a relatively low temperature.
- FIG. 1 (a) is a top view showing a configuration of a semiconductor module that exerts a force on the first embodiment of the present invention
- FIG. 1 (b) is a side view thereof.
- Fig. 2 is a perspective view of a thermally conductive sheet member that exerts a force on the first embodiment of the present invention.
- FIGS. 3 (a) to 3 (d) are top views showing a method for manufacturing a semiconductor module, which focuses on the first embodiment of the present invention.
- FIG. 4 is a side view showing a configuration of a semiconductor module that is effective in the first modification of the first embodiment of the present invention.
- FIG. 5 is a side view showing the configuration of a semiconductor module that works in a second modification of the first embodiment of the present invention.
- FIG. 6 is a side view showing the configuration of a semiconductor module that can be applied to the second embodiment of the present invention.
- FIG. 7 (a) is a top view showing a configuration of a semiconductor module that is effective in the third embodiment of the present invention
- FIG. 7 (b) is a side view thereof.
- Fig. 8 is a perspective view of a thermally conductive sheet member that exerts a force on a third embodiment of the present invention.
- FIGS. 9 (a) to 9 (c) are side views showing a method for manufacturing a semiconductor module, which focuses on the third embodiment of the present invention.
- FIG. 10 is a side view showing the configuration of a semiconductor module that is effective in the first modification of the third embodiment of the present invention.
- FIG. 11 is a side view showing a configuration of a semiconductor module according to a second modification of the third embodiment of the present invention.
- FIG. 12 is a side view showing the configuration of a semiconductor module that is effective in the third modification of the third embodiment of the present invention.
- FIG. 13 is a side view showing the configuration of a semiconductor module that is effective in the fourth modification of the third embodiment of the present invention.
- FIG. 14 is a side view showing the configuration of a semiconductor module that is effective in the fourth embodiment of the present invention.
- FIG. 15 is a side view showing the configuration of a semiconductor module that can be applied to the fifth embodiment of the present invention.
- FIG. 16 is a side view showing the configuration of a semiconductor module that is effective in the first modification of the fifth embodiment of the present invention.
- FIG. 17 is a view for explaining the shape of a thermally conductive sheet member.
- FIGS. 18 (a) and 18 (b) are side views showing a method of manufacturing the semiconductor module according to the first modification of the fifth embodiment of the present invention.
- FIG. 19 is a side view showing the configuration of a semiconductor module that is effective in the second modification of the fifth embodiment of the present invention.
- FIG. 20 (a) and FIG. 20 (b) are side views showing a method for manufacturing a semiconductor module according to the second modification of the fifth embodiment of the present invention.
- FIG. 21 is a side view showing the configuration of a semiconductor module that is effective in the third modification of the fifth embodiment of the present invention.
- FIGS. 22 (a) and 22 (b) are side views showing a method for manufacturing a semiconductor module according to a third modification of the fifth embodiment of the present invention.
- FIG. 23 is a side view showing a configuration of a semiconductor module of a reference example.
- FIG. 24 (a) is a cross-sectional view showing the configuration of a conventional semiconductor module
- FIG. 24 (b) is a cross-sectional view showing the configuration of another conventional semiconductor module.
- FIG. 1 is a configuration diagram of a semiconductor module 10 according to the first embodiment
- FIG. 1 (a) is a top view thereof
- FIG. 1 (b) is a side view thereof.
- the conductive thin wires 5, 5, ... are omitted.
- FIG. 2 is a perspective view of the thermally conductive sheet member 4 in the present embodiment.
- the semiconductor module 10 that exerts power on the present embodiment includes the cooling medium 1, the semiconductor element 3, the electronic components 2, 22, the heat conductive sheet member 4, and the conductive thin wires 5, 5,. I have.
- the semiconductor element 3 and the electronic components 2 and 22 are respectively mounted on the mounting surface 11a of the cooling medium 1, and for example, electrode terminals 13 provided on the cooling medium 1 through the conductive thin wires 5, 5,. Is electrically connected.
- the heat conductive sheet member 4 covers a part of the semiconductor element 3.
- illustration of the fine electrode (bus bar) provided in the electrode terminal 13 is abbreviate
- the cooling medium 1 has a substrate 11, and the electrode terminals 13 are provided on the mounting surface 11 a of the substrate 11 via, for example, an insulating member (not shown).
- an insulating member not shown
- a plurality of cooling fins 12, 12, are provided on the surface opposite to the mounting surface 11a.
- the semiconductor element 3 is a component that generates a large amount of heat and becomes a high temperature when the semiconductor module 10 is operated.
- the semiconductor element 3 can be a known semiconductor element without particular limitation.
- a Schottky diode, a pn junction diode, MOSFET (metal ox semiconductor semiconductor field-effect transistor, Mi ⁇ S El (metal semiconductor field-effect transistor), J-FET (junction field effect transistor) or thyristor can be used, and the semiconductor element 3 is preferably a wide band gap semiconductor element as described later.
- “wide band gap semiconductor” means a semiconductor whose energy difference (band gap) between the lower end of the conduction band and the upper end of the valence band is 2.0 eV or more. Is a force S that can include group III nitrides such as silicon carbide (SiC), GaN′AIN, diamond, etc., and silicon carbide is preferred in this embodiment.
- the semiconductor element 3 has four side surfaces.
- the first side surface (first side surface) 3c is the right side surface in FIG.
- the second side surface 3d is adjacent to the first side surface 3c, and is the front side surface of FIG.
- the third side surface 3e is on the opposite side of the first side surface 3c, and is the left side surface in FIG.
- the fourth side surface (not shown) exists on the opposite side of the second side surface 3d and is the back side surface in FIG.
- an insulating member 6 made of, for example, a silicone resin is disposed between the semiconductor element 3 and the heat conductive sheet member (detailed later) 4.
- an electrode is often provided on the upper surface of a semiconductor element.
- the heat conductive sheet member 4 is made of a material having not only heat conductivity but also conductivity! / If the heat conductive sheet member 4 comes into contact with the electrode, a short circuit occurs at the contact point. appear. However, if the insulating member 6 is interposed, the contact between the heat conductive sheet member 4 and the electrode can be avoided, and the occurrence of a short circuit can be prevented.
- Each of the electronic components 2 and 22 generates little heat even when the semiconductor module 10 is operated. Therefore, it is a component that does not become so high, for example, a control element having a control circuit for controlling the semiconductor element 3 or a passive element such as a resistor, a coil, or a capacitor.
- the electronic components 2 and 22 are not limited to electronic components used at high temperatures, and various commercially available electronic components can be used. For example, various commercially available capacitors can be used as the capacitor, from a chip capacitor to a large-capacity electrolytic capacitor or film capacitor.
- the electronic component 2 is mounted on the opposite side of the semiconductor element 3 with a side portion 4c (described later) of the heat conductive sheet member 4 therebetween.
- the electronic component 22 is mounted on the opposite side of the semiconductor element 3 across the electronic component 2! /.
- thermally conductive sheet member 4 will be described in detail. First, the structure of the heat conductive sheet member 4 is shown.
- the heat conductive sheet member 4 that exerts a force on the present embodiment has one end in the longitudinal direction (hereinafter simply referred to as “one end of the heat conductive sheet member”) 41 and the other end in the longitudinal direction (hereinafter simply referred to as “thermal conductivity").
- the other end of the adhesive sheet member ”) is bent so as to be close to the extent that 42 does not contact, and has an upper portion 4a, a lower portion 4b, and a side portion 4c. Since the upper part 4a exists on the other end 42 side and the lower part 4b exists on the one end 41 side, the upper part 4a exists without contacting the lower part 4b. Further, the side portion 4c exists between the upper portion 4a and the lower portion 4b and is a portion formed by bending the heat conductive sheet member 4 as described above. Projecting away from 3c.
- the upper part 4a covers the upper surface 3a of the semiconductor element 3, the lower part 4b is interposed between the lower surface 3b of the semiconductor element 3 and the mounting surface 11a, and the side part 4c is the first part of the semiconductor element 3. 1 Covers side 3c.
- the heat (cooling heat) of the cooling medium 1 is sufficiently transmitted through the lower portion 4b over the entire heat conductive sheet member 4. Therefore, even if the semiconductor element 3 generates heat and becomes high temperature due to the operation of the semiconductor module 10, the temperature of the heat conductive sheet member 4 can be kept relatively low (for example, the temperature of the cooling medium 1).
- the heat generated by the semiconductor element 3 can be prevented from being transmitted to the opposite side across the side portion 4c of the heat conductive sheet member 4, and the temperature rise of the electronic components 2 and 22 can be prevented. .
- the power S is used to efficiently perform heat separation.
- a part of the heat of the cooling medium 1 is transmitted to the semiconductor element 3 through the lower part 4b. Therefore, the temperature rise of the semiconductor element 3 can be suppressed.
- the surface area of the lower part 4b is 1/5 or more of the surface area of the heat conductive sheet member 4 as will be described later, the heat of the cooling medium (cooling heat) can be efficiently transferred to the entire heat conductive sheet member 4. Can do.
- the heat conductive sheet member 4 is bent so that the other end 42 does not come into contact with the end 41, so that the semiconductor element is formed between the upper portion 4a and the lower portion 4b from 4d. You can see 3, the second side surface 3d, the third side surface 3e and the fourth side surface.
- This region 4d is a region existing between the upper part 4a and the lower part 4b when bent close enough to the other end 42 not to contact the one end 41 of the heat conductive sheet member 4, and the heat conductive sheet member 4 It is not an area formed by perforating.
- the through holes for passing the conductive thin wires 5, 5, can be provided between the upper portion 4a and the lower portion 4b without being formed on the heat conductive sheet member 4.
- the upper portion 4a of the heat conductive sheet member 4 is not in contact with the lower portion 4b on the front side, the rear side, and the left side in FIG. 1 (b).
- the upper portion 4a of the heat conductive sheet member 4 is formed of the conductive thin wires 5, 5,.
- it may be in contact with the lower part 4b.
- the thermal conductive sheet member 4 is bent so that it does not contact the conductive thin wires 5, 5, ...!
- thermal conductivity thermal conductivity, thermal diffusivity, etc.
- the thermal conductivity of the thermally conductive sheet member 4 is 400 W / (m'K) or more in the plane direction of the sheet.
- the force S is preferably 800 W / (m'K) or more.
- the force S is most preferable, and it is 8 W / (m'K) or more and 15 W / (m-) or less in the thickness direction of the sheet. preferable.
- the thermal conductivity has a large anisotropy.
- the thermal conductivity in the thickness direction of the sheet is 1 / of the thermal conductivity in the plane direction of the sheet. It is preferably 20 or less.
- thermal diffusivity thickness of the thermally-conductive sheet member 4 is less than 0.025 mm or 0.3 mm is at 3 X 10- 4 m 2 / s or more 10 X 10- 4 m / s is preferred.
- thermal conductivity of 390 W / (m. K) is about
- thermal diffusivity is approximately 1.4 X 10- 4 m / s.
- the aluminum the thermal conductivity of 230 W / (m * K) about a thermal diffusivity Chiritsu force S0.9 X 10- 4 m 2 / s approximately. Therefore, the thermal conductivity in the planar direction of the thermal conductive sheet member 4 is larger than the thermal conductivity of copper or aluminum, and the thermal diffusivity of the thermal conductive sheet member 4 is larger than the thermal diffusivity of copper or aluminum.
- the heat conductive sheet member 4 is used as a partition member that divides the temperature region, and the cooling medium 1 that conveys the temperature of the cooling medium 1 that is not used to dissipate the heat generating element (semiconductor element 3) is cold. Used as a heat separation sheet member. Therefore, the use of the heat conductive sheet member 4 in the present invention is completely different from the conventional use.
- the thermal conductivity in the plane direction of the sheet is 400 W / (m-K), and the thermal conductivity in the thickness direction of the sheet is 20 W / (m 'K).
- the amount of heat transmitted through the thermally conductive sheet member W is the heat of the sheet member.
- the conductivity is TC (W / mK)
- the cross-sectional area of the sheet member in the direction perpendicular to the heat conduction direction is S (m 2 )
- the temperature difference is K (° ⁇ )
- the length is LL (m).
- W2 is 5 times W1.
- the heat conductive sheet member 4 can transmit a heat amount 5 times as large as that in the plane direction of the sheet in the thickness direction of the sheet.
- the area in the thickness direction of the sheet is the plane direction of the sheet. 1/5 of the area is sufficient.
- the heat (cooling heat) of the cooling medium 1 is first transmitted to the lower part 4b as described above, and then from the lower part 4b to the side part 4c and the upper part 4a. Are transmitted in order. That is, the heat of the cooling medium 1 is first transferred in the thickness direction of the heat conductive sheet member 4 (transfer to the lower part 4b) and then transferred in the plane direction of the heat conductive sheet member 4 (from the lower part 4b to the side part). 4c and transmission to upper 4a).
- the area in the thickness direction of the sheet should be 1/5 of the area in the plane direction of the sheet, so the surface area of the lower part 4b is the surface area of the heat conductive sheet member 4. If it is about 1/5, the heat of the cooling medium 1 can be transmitted to the whole heat conductive sheet member 4.
- the surface area of the lower part 4b is preferably 1/5 of the surface area of the heat conductive sheet member 4, but considering the heat contact, it is 1/4 or more of the surface area of the heat conductive sheet member 4. More preferably, it is 1/3 or more of the surface area of the preferred heat conductive sheet member 4.
- the surface area of the lower portion 4b is small. Based on the above, taking into account the requirements for the heat transfer efficiency of cooling medium 1 (cooling efficiency of cooling medium 1), the demand for miniaturization of semiconductor module 10, and the usage situation, 1/5 is used as the reference value. It is preferable to determine the ratio of the surface area.
- the surface area of the lower part 4b is necessarily the total surface area of the thermally conductive sheet member 4. It is thought that it will be more than 1/5.
- the heat conductive sheet member 4 is preferably made of a material having the above heat conductivity. Most preferably, it consists of a 1S graphite sheet.
- the graphite sheet has excellent thermal conductivity and conductivity! /. Therefore, if the graphite sheet is used as the thermal conductive sheet member 4, the semiconductor element 3 can only block the heat generated by the semiconductor element 3. This is because the noise of electromagnetic waves generated by this switching can be absorbed, and as a result, the noise generated by the semiconductor element 3 can be reduced.
- the thermal conductivity in the plane direction of the sheet and the thermal conductivity in the thickness direction of the sheet are within the above range, that is, the thermal conductivity in the plane direction of the sheet is 400 W. / (m'K) or more, usually about 800 W / (m'K), and about 1600 W / (m'K) for the best graphite sheet.
- the rate is 8 W / (m′K) or more and 15 W / (m′K) or less, so the thermal conductivity anisotropy of the graphite sheet is large.
- FIGS. 3A to 3D are top views showing a method for manufacturing the semiconductor module 10.
- the heat conductive sheet member 4 is disposed on the mounting surface 11a of the cooling medium 1 (step (a)). Then, the one end 41 side of the heat conductive sheet member 4 (to be precise, the portion (first portion) having an area of 1/5 or more of the surface area of the heat conductive sheet member 4 in the one end 41 side) is cooled. Adhere to the mounting surface 11a of medium 1.
- the graphite sheet is bonded to the mounting surface via a carbonized metal.
- a metal such as Ti, Mo, or W is vapor-deposited on the lower surface of the graphite sheet, and the interface between the deposited metal and the graphite sheet is heated and carbonized.
- the metal layer is formed on the lower surface of the graph sheet via the carbonized layer.
- a graph eye sheet is disposed so that the metal layer is in contact with the mounting surface 11a, and is crimped to the mounting surface 11a. As a result, the graphite sheet can be securely bonded to the mounting surface.
- solder may be used instead of pressure bonding. Specifically, first, a metal layer made of a metal that is compatible with solder (for example, A1 or Cu) and a metal that can form a carbide layer (for example, Ti, Co, etc.) are deposited on the lower surface of the graphite sheet, A carbonized layer is formed by carbonizing the interface between the deposited metal and the graphite sheet. Thereafter, a solder layer may be provided on the upper surface of the metal layer, and the graph sheet may be arranged so that the solder layer contacts the mounting surface 11a.
- solder for example, A1 or Cu
- the semiconductor element 3 is mounted on the first portion of the heat conductive sheet member 4 (step (b)). At this time, the semiconductor element 3 is mounted such that the third side surface 3e is disposed closer to the one end 41 side of the heat conductive sheet member 4 than the first side surface 3c.
- the semiconductor element 3 and the electrode terminal 13 provided in the cooling medium 1 are electrically connected using the conductive thin wires 5, 5,.
- the conductive thin wires 5, 5,... are disposed across the portions 4i, 4i around the second and fourth side surfaces of the heat conductive sheet member 4, respectively.
- the insulating member 6 is injected into the upper surface 3a of the semiconductor element 3 to cover the upper surface 3a. At this time, it is preferable to inject the insulating member 6 so as to cover not only the upper surface 3a of the semiconductor element 3 but also the conductive thin wires 5, 5,.
- the other end 42 of the heat conductive sheet member 4 is lifted, and the heat conductive sheet member 4 is placed so that the other end 42 is located above the end 41. Bend (process (c)). At this time, it is preferable that the other end 42 of the heat conductive sheet member 4 is not in contact with the one end 41.
- the second portion (in this embodiment, the side portion 4c) of the heat conductive sheet member 4 covers the first side surface 3c of the semiconductor element 3.
- the electronic component 2 is mounted on the opposite side of the semiconductor element 3 with the side portion 4c of the thermally conductive sheet member 4 being separated (step (d)).
- the electronic component 22 is mounted on the opposite side of the semiconductor element 3 with the electronic component 2 therebetween. Then, the electronic components 2, 22 and the electrode terminal 13 provided on the cooling medium 1 are electrically connected using the conductive thin wires 5, 5,. Thereby, it is possible to produce the semiconductor module 10 shown in FIG.
- thermally conductive sheet member is provided! /, NA! /, A conventional semiconductor module and a figure.
- semiconductor module 10 that is effective in the present embodiment will be described in comparison with the semiconductor module 70 shown in FIG. 23 (hereinafter referred to as “semiconductor module of reference example”) 70. Also, with semiconductor elements The difference between using a Si device and using a wide bandgap semiconductor device will be described. First, the advantages of the semiconductor module 10 that are effective in the present embodiment will be described.
- the heat generated by the semiconductor element is diffused and transmitted around the semiconductor element. For this reason, when electronic components are mounted around the semiconductor element, the temperature of the electronic components increases. In order to prevent the temperature of the electronic component from rising, it is conceivable that the electronic component is arranged at a position sufficiently away from the semiconductor element so that the heat generated by the semiconductor element is not transmitted. However, if the electronic components are arranged in this way, the semiconductor module is increased in size. Also, when electrically connecting a semiconductor element and an electronic component using a conductive thin wire, if the electronic component is placed at a position sufficiently away from the semiconductor device, the conductive thin wire becomes long and cannot be ignored! / A large resistance is generated in the conductive thin wire. As a result, a loss occurs in the conductive thin wire.
- the heat conductive sheet member 74 is provided only between the mounting surface 11 a of the cooling medium 1 and the lower surface 3 b of the semiconductor element 3. In this case, since heat from the cooling medium 1 (cooling heat) is transmitted to the semiconductor element 3, the surface area of the heat conductive sheet member 74 is sufficiently large compared to the area of the lower surface 3b of the semiconductor element 3! / The temperature rise due to heat generated from the semiconductor element 3 can be reduced. However, as in the conventional semiconductor module, the heat generated by the semiconductor element 3 is diffused and transmitted.
- the temperature of the electronic components arranged around the semiconductor element is increased, and in order to avoid the temperature increase, the large size of the semiconductor module is required. In addition to incurring higher costs and higher costs, it also incurs losses in long conductive wires.
- the heat conductive sheet member 4 efficiently performs the heat separation, so that the temperature rise around the semiconductor element 3 is suppressed.
- the thermal conductivity of Si does not show such a large value
- the semiconductor module when a Si element is used as a semiconductor element, the semiconductor module generates heat generated by passing a current through the Si element during operation. It is preferable that the thermal design is performed so that the heat generated by the Si element is efficiently released.
- the temperature of the Si element exceeds S150 ° C, the semiconductor characteristics will be weakened, and it will not function as a current control element, so there is a danger.
- the heat density is preferable so that the density is high! / And the temperature at the part does not exceed 150 ° C.
- the current density inside the Si element during operation is 10 X 10 4 A / m 2 or more
- heat generation from the Si element becomes remarkable, and the above-described thermal design is essential.
- the Si element when a Si element is used as a semiconductor element, a heat release path must be considered in the thermal design, and the Si element must be brought into contact with a cooling medium serving as a heat release path.
- the Si element is directly bonded to the package substrate by solder or the like using a method called die bonding.
- the plurality of Si elements are two-dimensionally arranged on the mounting surface 11a of the package substrate so as not to overlap each other. Therefore, the area of the mounting surface 11a of the package base material becomes large, leading to an increase in the size of the semiconductor module.
- Si element is used as a semiconductor element, it is not only Si-MOSFET but also Si-IGBT (Insulated Gate Bipolar Transistor) in the operation at a current density of 50 X 10 4 A / m 2 or more. Since heat generation due to loss increases, it is difficult to keep the semiconductor module operating while maintaining the allowable temperature of the Si element at around 150 ° C.
- Si-MOSFET is a MOSFET formed using Si as a semiconductor material
- SHGBT is an IGBT formed using Si as a semiconductor material.
- SHGBT can reduce the electrical resistance by an order of magnitude or more compared to S-MOSFET.
- IGBT electrical resistance of IGBT decreases with increasing temperature. For this reason, if the IGBT is operated at a constant voltage, the amount of current flowing through the semiconductor element increases, leading to a further increase in the amount of heat generated in the IGBT, and thermal runaway may cause destruction of the IGBT in some cases. This is observed as a breakdown due to current concentration inside one SHGBT, or as a breakdown due to current concentration on one of multiple SHGBTs connected in parallel.
- the present invention is particularly effective when the wideband gap semiconductor element is miniaturized.
- the wide band gap semiconductor element when the wide band gap semiconductor element is downsized, the amount of heat generated from the wide band gap semiconductor element increases.
- the electronic component In the conventional semiconductor module, when the wide band gap semiconductor element is miniaturized, the electronic component must be arranged further away from the wide band gap semiconductor element. The heat from the wide band gap semiconductor element is transferred to the electronic component. As described above, in the conventional semiconductor module, the size of the wide band gap semiconductor element is reduced in order to reduce the size of the semiconductor module, but the size of the module is increased.
- the semiconductor module according to the present embodiment when the wide band gap semiconductor element is downsized, the heat from the wide band gap semiconductor element is obtained even if the electronic component is mounted near the wide band gap semiconductor element. Is not transmitted to electronic components.
- the electronic component can be mounted close to the semiconductor element, so that the semiconductor module can be downsized. Can do.
- the thermal conductivity of silicon carbide (SiC) is 49. It is about 0 W / (m ′ K), and the thermal conductivity of diamond is about 2000 W / (m ⁇ ).
- SiC silicon carbide
- the thermal conductivity of diamond is high, the efficiency of heat release from the semiconductor element is increased, and as a result, an increase in temperature at a high current density portion in the semiconductor element can be suppressed.
- a MOSFET formed using a Si element as the semiconductor element is used with the same breakdown voltage.
- a loss of half or less can be realized. Such low loss can be expected to reduce the amount of heat generated by the semiconductor element.
- MOSFET composed of a wide bandgap semiconductor element when MOSFET composed of a wide bandgap semiconductor element is used as a semiconductor element, high breakdown voltage and low loss can be achieved that surpasses the case where an IGBT composed of a Si element is used as the semiconductor element. Therefore, the high-speed performance of the MOSFET can be used for high-voltage, large-current control. In other words, if a MOSFET composed of a wide band gap semiconductor element is used as the semiconductor element, switching loss that occurs when the response speed of the semiconductor element is slower than the switching time of the semiconductor element can be reduced.
- a MOSFET is formed using a wide band gap semiconductor element as a semiconductor element, the ability to suppress heat generation of the semiconductor element even when a current density of 50 X 10 4 A / m 2 or more flows. As a result, the semiconductor module can be operated satisfactorily. Therefore, in a semiconductor module, it is preferable that at least one active region of a plurality of semiconductor elements is constituted by a wide band gap semiconductor element. Such a semiconductor module has a capacity of 50 ⁇ 10 4 A / m 2 or more. It is preferable to apply when a current having a current density flows.
- the present inventors have confirmed the following. That is, when a MOSFET is formed using a wide band gap semiconductor element as the semiconductor element, the force S when the wide band gap semiconductor element is kept at a high temperature by operating at a current density of 50 X 10 4 A / m or more, Wide bandgap than when keeping wide band gap semiconductor elements at low temperatures
- the electrical resistance of the semiconductor device increases.
- M0SFETs are often operated at a constant voltage! /, So when the electrical resistance increases as a result of the wide bandgap semiconductor element becoming hot, the amount of current flowing through the wide bandgap semiconductor element decreases. The Therefore, the amount of heat generated in the MOSFET is reduced.
- the inventor of the present application has found that if the semiconductor element is a semiconductor element made of silicon carbide (4H-SiC among them), compared with other wide bandgap semiconductor elements, low loss, stability and It has been confirmed that it is excellent in terms of reliability. The present inventor believes that this is due to the fact that low defect density wafers are supplied and that problems such as dielectric breakdown due to defects in the crystal are unlikely to occur! /!
- the semiconductor module 10 that is effective in this embodiment can efficiently perform heat separation
- the electronic component 2 can be mounted closer to the semiconductor element 3 than the conventional module. Therefore, it is possible to reduce the size of the module, and further, it is possible to reduce the cost of the module and improve the productivity.
- thermally conductive sheet member 4 has a lower portion 4b, a semiconductor module
- the heat conductive sheet member 4 can be kept at substantially the same temperature as the cooling medium 1. Since the heat conductive sheet member 4 has the side portions 4c, the transfer of heat to the electronic components 2 and 22 can be suppressed. Since the heat conductive sheet member 4 has the upper part 4a, not only heat separation but also electromagnetic wave noise can be absorbed. In other words, heat separation can be performed even if the heat conductive sheet member 4 does not have the upper part 4a, but the heat conductive sheet member 4 has the upper part 4a! / Can be performed more efficiently and electromagnetic noise can be absorbed. Therefore, the heat conductive sheet member 4 may have a shape shown in first and second modifications described later.
- the conductive thin wires 5, 5 are passed through 4d. ,... Can be provided, so that the conductive thin wires 5, 5,.
- the manufacturing time of the semiconductor module 10 can be shortened and the manufacturing cost can be reduced.
- the heat conductive sheet member only needs to be bent so as to approach a certain part (first part) 1S and the other part (second part).
- first part first part
- second part second part
- it may be bent so that the other end in the short direction approaches one end in the short direction, or may be bent so that one end in the long direction approaches one part in the middle in the longitudinal direction.
- FIG. 4 is a side view showing the configuration of the semiconductor module 110 that is effective in the first modification of the first embodiment. In the figure, conductive thin wires are omitted.
- the heat conductive sheet member 114 has a lower portion 114b and a side portion 114c, V, and has an upper portion! /, N! / ,. In this way, the heat conductive sheet member 114 has the upper part! /, And since it has at least the side part 114c, the transfer of heat to the electronic components 2 and 22 can be suppressed. It is possible to fiel heat separation.
- the manufacturing method of the semiconductor module 110 which is effective in this modification, is substantially the same as the manufacturing method described in the first embodiment. However, in the process of bending the thermally conductive sheet member 114, the one end 41 side becomes the lower portion 114b and the other end. The heat conductive sheet member 114 is bent so that the 42 side becomes the side portion 114c.
- FIG. 5 is a side view showing the configuration of the semiconductor module 210 that is effective in the second modification of the first embodiment. In the figure, conductive thin wires are omitted.
- the thermally conductive sheet member 214 has the force S having the upper part 214a, the lower part 214b, and the side part 214c as described in the first embodiment, and the upper part 214a It does not cover the entire upper surface 3a.
- heat separation can be performed even if the heat conductive sheet member 214 does not cover the entire upper surface 3a of the semiconductor element 3, heat separation can be performed.
- the manufacturing method of the semiconductor module 210 which is the force of this modification, is substantially the same as the manufacturing method described in the first embodiment. However, in the process of bending the thermally conductive sheet member 214, one end side becomes the lower portion 214b, and the like. The heat conductive sheet member 214 is bent so that the end side becomes the upper part 214a.
- FIG. 6 is a side view showing the configuration of the semiconductor module 20 according to the second embodiment. In the figure, the conductive thin wires are omitted.
- the target component is the electronic component 2 and the other component different from the target component is the semiconductor element 3. That is, the heat conductive sheet member 4 covers a part of the electronic component 2 instead of the semiconductor element 3. This is specifically shown below.
- the thermally conductive sheet member 4 has an upper portion 4a, a lower portion 4b, and a side portion 4c as in the first embodiment.
- the upper portion 4a covers the upper surface 2a of the electronic component 2.
- the lower part 4b is sandwiched between the lower surface 2b of the electronic component 2 and the mounting surface 11a, and its surface area is 1/5 or more of the surface area of the heat conductive sheet member 4 as in the first embodiment.
- the side portion 4c covers the first side surface (first side surface) 2c of the electronic component 2.
- the semiconductor element 3 is mounted on the opposite side of the electronic component 2 across the side portion 4c of the heat conductive sheet member 4, and the electronic component 22 is mounted on the electronic component 2 with respect to the semiconductor element 3. It is mounted on the opposite side across 2.
- the semiconductor element 3 since the semiconductor element 3 is not covered by the heat conductive sheet member 4, the heat generated by the semiconductor element 3 is diffused and transmitted to the surroundings. However, a part of the electronic component 2 is covered with the heat conductive sheet member 4, and the surface area of the lower part 4b is 1/5 or more of the surface area of the heat conductive sheet member 4 as in the first embodiment. It is possible to efficiently transfer the heat (cooling heat) of the medium to the entire heat conductive sheet member 4. Therefore, the heat generated by the semiconductor element 3 can be prevented from being transmitted to the electronic component 2. Furthermore, since the electronic component 22 is mounted on the opposite side of the semiconductor element 3 with the electronic component 2 therebetween, the heat generated by the semiconductor element 3 can also be prevented from being transmitted to the electronic component 22. In other words, even the semiconductor module 20 that is the power of this embodiment can be measured by the power of efficiently performing heat separation.
- the manufacturing method of the semiconductor module 20 that is effective in the present embodiment is substantially the same as the manufacturing method of the semiconductor module 10 described in the first embodiment, but the process shown in FIG. 3 (b) of the first embodiment. Then, not the semiconductor element 3 but the electronic component 2 is arranged on the one end 41 side of the heat conductive sheet member 4, and no insulating member is provided in the step shown in FIG. 3 (c). In the process shown in Fig. 3 (d), The heat conductive sheet member 4 is bent so that the other end 42 is placed on the end 41, and then the semiconductor element 3 is separated from the electronic component 2 by the side 4c of the heat conductive sheet member 4. Mount on the opposite side.
- the semiconductor module 20 that is effective in the present embodiment is the same as the above embodiment.
- this embodiment may have the following configuration.
- the cooling medium 1 may not have a very good cooling capacity.
- the cooling medium 1 uses a metal cooling medium that preferably has an excellent cooling capacity. It is preferable to have a high thermal conductivity.
- the semiconductor module according to the present embodiment may not include an insulating member as shown in FIG. This is because, in many cases, electrodes are not provided on the upper surface of the electronic component, so even if a part of the heat conductive sheet member contacts the upper surface of the electronic component, there is a risk that a short circuit will occur at the contact point. This is because it is extremely low.
- an insulating member may be interposed as in the first embodiment.
- the heat conductive sheet member does not have to have an upper portion as shown in Fig. 4 in the first embodiment, and a part of the upper surface of the electronic component as shown in Fig. 5 in the same embodiment. May be covered.
- FIG. 7 is a configuration diagram of the semiconductor module 30 according to the third embodiment, FIG. 7 (a) is a top view thereof, and FIG. 7 (b) is a side view thereof. In the figure, conductive thin wires are omitted.
- FIG. 8 is a perspective view of the thermally conductive sheet member 4 in the present embodiment.
- the heat conductive sheet member 4 covers not only the first side surface 3c but also the third side surface 3e of the semiconductor element 3 as in the first embodiment. Yes. Below, the heat conductive sheet member 4 in this embodiment is shown concretely.
- the thermally conductive sheet member 4 in this embodiment is covered from above the semiconductor element 3 so that one end 41 side and the other end 42 side thereof are in contact with the mounting surface 11a. 4b, lower part 4b, side part 4c, and second side part 4e.
- the upper portion 4a exists in the center in the longitudinal direction of the heat conductive sheet member 4, and covers the upper surface 3a of the semiconductor element 3 as in the first embodiment.
- the lower part 4b and the lower part 4b are respectively arranged outside the semiconductor element 3 on the mounting surface, and are present on the one end 41 side and the other end 42 side of the thermally conductive sheet member 4, respectively.
- the side part 4c and the second side part 4e are respectively present between a part of the upper part 4a and the lower part 4b and the lower part 4b, as in the first embodiment, and the side part 4c is the first side surface of the semiconductor element 3. 3c is covered, and the second side portion 4e covers the third side surface 3e of the semiconductor element 3.
- the heat of the cooling medium 1 (cooling heat) is first transmitted to the lower part 4b and the lower part 4b, then to the side part 4c and the second side part 4e, respectively, and then to the upper part 4a.
- the heat of the cooling medium 1 is transmitted from the one end 41 and the other end 42 of the heat conductive sheet member 4 to the center in the longitudinal direction.
- the total surface area of the two lower parts 4b and 4b is the total surface area of the heat conductive sheet member 4 as described in the first embodiment. It is preferably 1/5 or more.
- the upper part 4a exists away from the mounting surface 11, and the conductive thin wires 5, 5, ... are provided between the upper part 4a and the mounting surface 11 through 4d. Therefore, the conductive thin wires 5, 5,... Can be provided without providing holes in the heat conductive sheet member 4 as in the first embodiment.
- the upper portion 4a of the heat conductive sheet member 4 is not in contact with the mounting surface 11a on both the near side and the far side in FIG. 7 (b). However, for example, when the conductive thin wires 5, 5, 5,... Are provided only on the front side in FIG. 7 (b), the upper part 4a of the heat conductive sheet member 4 contacts the mounting surface 11a on the back side in the figure. It may be. The heat conductive sheet member 4 only needs to be bent so as not to contact the conductive thin wires 5, 5,.
- FIGS. 9A to 9C are top views showing a method for manufacturing the semiconductor module 30 according to the present embodiment.
- the semiconductor element 3 is fixed to the mounting surface 11a of the cooling medium 1 using a conductive adhesive (not shown) such as solder (step (a)). . Thereafter, the electrode terminals (not shown) provided on the cooling medium 1 are electrically connected to the semiconductor element 3 using conductive thin wires (not shown). Connect.
- a conductive adhesive such as solder
- the insulating member 6 is injected into the upper surface 3a of the semiconductor element 3 to cover the upper surface 3a and the conductive thin wire. Thereafter, the thermally conductive sheet member 4 is brought closer from the direction of the arrow shown in the figure, and the thermally conductive sheet member 4 is placed on the insulating member 6 (step (b)).
- one end 41 side and the other end 42 side of the thermal conductive sheet member 4 are brought into contact with the mounting surface 11a, while the entire thermal conductive sheet member 4 is not brought into contact with the conductive thin wire (not shown). Do it. Note that it is preferable that the one end 41 side and the other end 42 side of the heat conductive sheet member 4 are bonded to the mounting surface 11a using the bonding method described in the first embodiment.
- the area of the portion (first portion) in contact with the mounting surface 11a of the heat conductive sheet member 4 is equal to the surface area of the heat conductive sheet member 4.
- the heat conductive sheet member 4 is placed on the insulating member 6 so that it becomes 1/5 or more.
- the electronic component 2 is mounted on the opposite side of the semiconductor element 3 with the side portion 4c of the thermally conductive sheet member 4 being separated (step (c)).
- the electronic component 22 is mounted on the opposite side of the semiconductor element 3 with the electronic component 2 therebetween.
- the electronic components 2 and 22 and the electrode terminals (not shown) provided on the cooling medium 1 are electrically connected to each other using conductive thin wires (not shown). Thereby, it is possible to manufacture the semiconductor module 30 shown in FIG.
- the semiconductor module can efficiently perform heat separation even if the heat conductive sheet member does not have an upper portion. Therefore, the structure shown in the following modified examples may be sufficient as a heat conductive sheet member.
- FIG. 10 is a side view showing the configuration of the semiconductor module 130 that is effective in the first modification of the third embodiment. In the figure, conductive thin wires are omitted.
- the heat conductive sheet member 134 has a lower portion 134b and side portions 134c.
- the side part 134c covers the first side surface 3c of the semiconductor element 3, and the lower part 134b extends from the side part 134c.
- the electronic component 2 is mounted on the opposite side of the semiconductor element 3 with the side portion 134c therebetween.
- the manufacturing method of the semiconductor module 130 which is the power of this modification, is substantially the same as the manufacturing method described in the third embodiment. However, in the process of bending the thermally conductive sheet member 134, one end becomes the lower portion 134b and the other end is The heat conductive sheet member 134 is bent so as to be the side part 134c.
- FIG. 11 is a side view showing the configuration of the semiconductor module 230 that is effective in the second modification of the third embodiment. In the figure, conductive thin wires are omitted.
- the thermally conductive sheet member 234 has an upper part 234a, one lower part 234b, and a side part 234c.
- the upper part 234a covers the entire upper surface 3a of the semiconductor element 3.
- the side portion 234c extends from the upper portion 234a and covers the first side surface 3c of the semiconductor element 3.
- the lower portion 234b extends from the side portion 234c and contacts the mounting surface 11a.
- the manufacturing method of the semiconductor module 230 which is the force of this modification, is substantially the same as the manufacturing method described in the third embodiment. However, in the process of bending the heat conductive sheet member 234, one end becomes the lower portion 234b and the other end The heat conductive sheet member 234 is bent so as to be the upper part 234a.
- FIG. 12 is a side view showing the configuration of the semiconductor module 330 that is effective in the third modification of the third embodiment. In the figure, conductive thin wires are omitted.
- the heat conductive sheet member 334 has an upper part 334a, one lower part 334b, a side part 334c, and a second side part 334e.
- the upper part 334a covers the entire upper surface 3a of the semiconductor element 3.
- the side portion 334c extends from the upper portion 334a so as to cover the first side surface 3c of the semiconductor element 3, and the second side portion 334e extends from the upper portion 33 4a so as to cover the third side surface 3e of the semiconductor element 3. Yes.
- the lower part 334b is connected to the mounting surface 11a from the second side part 334e. It extends.
- the heat conductive sheet member 334 does not have a lower portion extending from the side portion 334c. Even in such a case, if the surface area of the lower portion 334b is 1/5 or more of the surface area of the heat conductive sheet member 334, the cooling heat of the cooling medium 1 can be transmitted to the heat conductive sheet member 334. Therefore, heat separation can be performed efficiently.
- the manufacturing method of the semiconductor module 330 which focuses on this modification, is substantially the same as the manufacturing method described in the third embodiment. However, in the step of bending the heat conductive sheet member 334, one end becomes the side portion 334c. The heat conductive sheet member 234 is bent so that becomes the lower part 334b.
- FIG. 13 is a side view showing the configuration of the semiconductor module 40 that is effective in the fourth modification of the third embodiment.
- the target component is the electronic component 2.
- the semiconductor module 40 is an embodiment
- the shape of the heat conductive sheet member 4 is the first to third modifications of the third embodiment.
- the shape shown in the example may be used.
- FIG. 14 is a configuration diagram of a semiconductor module 50 according to the fourth embodiment. In the figure, conductive thin wires are omitted.
- the semiconductor module 50 that has the power of this embodiment includes a heat sink 7. This is specifically shown below.
- the heat sink 7 in the present embodiment is, for example, a plate made of GaN or Al 2 O force,
- the heat conductive sheet member 4 is a force contacting the mounting surface 11a of the cooling medium 1 and the lower surface 7b of the heat sink 7 Semiconductor element 3 There is no direct contact. Therefore, as compared with the case where the heat conductive sheet member 4 is in direct contact with the semiconductor element 3 as in the first or third embodiment, the heat conductive sheet member 4 has a smaller cooling capacity than the cooling medium 1. Temperature rise can be prevented.
- the heat sink 7 is made of an insulating material (eg, GaN or Al 2 O 3), a semiconductor
- the semiconductor module 50 which is effective in the present embodiment, can exhibit not only a heat shielding effect but also a noise shielding effect.
- the manufacturing method of the semiconductor module 50 which is the power of the present embodiment, is substantially the same as the manufacturing method of the semiconductor module 10 of the first embodiment.
- the present embodiment may have the following configuration.
- the heat sink 7 may be provided in the semiconductor module 30 according to the third embodiment.
- the heat sink 7 may be interposed between the lower surface 3b of the semiconductor element 3 and the mounting surface 11a. preferable. Thereby, as described above, the force S that diffuses the heat generated by the semiconductor element 3 in the heat radiating plate 7 can be diffused, and the temperature rise of the semiconductor element 3 can be suppressed.
- the heat sink 7 is mounted on the lower surface 3b of the semiconductor element 3 even when the target component is the electronic component 2 as in the fourth modification of the second embodiment and the third embodiment. It may be interposed between the surface 11a. As a result, the heat generated by the semiconductor element 3 can be diffused in the heat radiating plate 7, so that when the heat radiating plate 7 is not provided as in the second variation and the fourth modification of the third embodiment. In comparison, the temperature of the semiconductor element 3 can be prevented from rising.
- the heat conductive sheet member does not need to have an upper portion as shown in the first modification of the first embodiment (Fig. 4) (second modification of the same embodiment ( As shown in Fig. 5), the upper part may cover a part of the upper surface of the semiconductor element. Further, the heat conductive sheet member may have the shape shown in the third embodiment and its modification.
- FIG. 15 is a configuration diagram of a semiconductor module 60 according to the fifth embodiment. In the figure, conductive thin wires are omitted.
- the semiconductor module 60 according to the present embodiment differs in the relative positional relationship between the force electronic component 2 and the semiconductor element 3 that are substantially the same as those of the semiconductor module 50 according to the fourth embodiment. This is specifically shown below.
- the support pillar 61 is provided on the mounting surface 11a of the cooling medium 1, and the second substrate 62 is the substrate 1 of the cooling medium 1 on the support 61. It is fixed to be approximately parallel to 1.
- the electronic component 2 is mounted on the second substrate 62.
- the support 61 and the second substrate 62 may be made of substantially the same material (metal) as the cooling medium 1 or may be made of a material different from the cooling medium 1 (for example, resin). This is because the electronic component 2 is provided on the second substrate 62, so that the support 61 and the second substrate 62 do not have to have a cooling function.
- the thermally conductive sheet member 4 in the present embodiment covers a part of the semiconductor element 3 as described in the first and fourth embodiments. Therefore, heat separation can be performed efficiently, so that heat transfer to the electronic component 2 can be suppressed even if the electronic component 2 is disposed above the semiconductor element 3 as shown in FIG.
- the semiconductor module 60 according to the present embodiment can be manufactured according to the manufacturing method described in the first embodiment.
- the semiconductor module may not include the heat sink 7 as described in the first to third embodiments. Further, the semiconductor module may have a configuration shown in the following modified example.
- FIG. 16 is a side view showing the configuration of the semiconductor module 160 that is effective in the first modification of the fifth embodiment.
- FIG. 17 is a view for explaining the shape of the upper part 164a of the heat conductive sheet member 164.
- the conductive thin wires are omitted.
- the insulating member, the heat radiating member, and the cooling fins for the cooling medium 1 are omitted for the sake of clarity.
- the upper portion 164a of the thermally conductive sheet member 164 is different from that in the fifth embodiment.
- the entire upper surface 3a of the conductor element 3 is not covered. This is specifically shown below.
- the upper collar 164a exists in a third area 163 (shaded area shown in FIG. 17) sandwiched between the first area 161 and the second area 162.
- the first region 161 is a region formed by connecting the first side surface (first side surface) 3c of the semiconductor element 3 and the first side surface (first side surface) 2c of the electronic component 2 to the second side 161.
- the region 162 is a region formed by connecting the third side surface (second side surface) 3e of the semiconductor element 3 and the third side surface (second side surface) 2e of the electronic component 2.
- the first side surface 3c of the semiconductor element 3 is a side surface covered with the side portion 164c of the heat conductive sheet member 164, and
- the third side surface 3e is a side surface opposite to the first side surface 3c.
- the first side surface 2c of the electronic component 2 is a side surface that is disposed in front when the first side surface 3c of the semiconductor element 3 is viewed from the front of the side surfaces of the electronic component 2.
- the third side surface 2e of the electronic component 2 is the side surface opposite to the first side surface 2c.
- FIGS. 18 (a) and 18 (b) are side views showing a method for manufacturing the semiconductor module 160, which focuses on the present modification.
- a main body in which the support 61 and the second substrate 62 are attached to the mounting surface 11a of the cooling medium 1 is prepared.
- the heat conductive sheet member 164 is arranged on the mounting surface 11a so that the other end 42 side is closer to the support 61 than the one end 41 side.
- the portion (first portion) having an area of 1/5 or more of the surface area of the heat conductive sheet member 4 on the one end 41 side
- the semiconductor element 3 is mounted so that the side surface 3c is closer to the support 61 than the third side surface 3e.
- the semiconductor element 3 and an electrode terminal (not shown) provided on the cooling medium 1 are electrically connected using a conductive thin wire (not shown), and the insulating member 6 is injected into the upper surface 3a of the semiconductor element 3. Cover the upper surface 3a and its conductive wires.
- the power is applied to the second substrate 62 such that the first side surface 2c is closer to the support 61 than the third side surface 2e.
- the subcomponent 2 is mounted (step (b)), and the electronic component 2 and the electrode terminal (not shown) provided on the second substrate 62 are electrically connected using a conductive thin wire (not shown). .
- the heat conductive sheet member 164 is bent so that the other end 42 of the heat conductive sheet member 164 exists in the third region 1 63 (process). (c)).
- the second portion of the heat conductive sheet member 164 in this variation, the side portion 164c of the heat conductive sheet member 164) is disposed so as to cover the first side surface 3c of the semiconductor element 3, and this variation
- the semiconductor module 160 according to the above can be manufactured.
- the electronic component may be disposed immediately above the semiconductor element.
- the heat conductive sheet member may be bent as described in the fifth embodiment, which may be bent as in the present modification.
- FIG. 19 is a side view showing the configuration of the semiconductor module 260 that is effective in the second modification of the fifth embodiment.
- the thermal conductive sheet member 164 has an upper part 164a, a lower part 164b, and a side part 164c, as in the first modification example of the fifth embodiment.
- the side portion 164c exists on the opposite side of the support 61 from the semiconductor element 3.
- the semiconductor element 3 is supported by the support as compared with the first modification of the fifth embodiment.
- the semiconductor element 3 is mounted such that the first side surface 3c is closer to the support 61 than the third side surface 3e.
- the third side surface 3e is mounted so as to be closer to the support 61 than the first side surface 3c.
- the first side surface of the semiconductor element is defined as the side surface covered with the side portion of the thermally conductive sheet member.
- the electronic component 2 is mounted such that the first side surface 2c is closer to the support 61 than the third side surface 2e.
- the third side surface 2e is more than the first side surface 2c. It is mounted so as to be closer to the column 61.
- this means that the first side surface of the electronic component is the electronic part disposed on the front side when the first side surface of the semiconductor element is viewed from the front side. This is because it is defined as the aspect of the product.
- FIGS. 20 (a) and 20 (b) are side views showing a method for manufacturing the semiconductor module 260, which focuses on the present modification. In the following description, differences from the manufacturing method according to the first modification of Embodiment 5 are mainly shown.
- the thermally conductive sheet member 164 is mounted so that the one end 41 side is closer to the support 61 than the other end 42 side. Place on face 11a.
- the thermal conductivity is such that the other end 42 of the thermal conductive sheet member 164 is present in the third region 163 as in the step shown in FIG. 18 (b).
- the sheet member 164 is bent (step (c)).
- the semiconductor module 260 can be manufactured which is effective in this modification.
- FIG. 21 is a side view showing the configuration of the semiconductor module 360 that is effective in the third modification of the fifth embodiment. In the figure, conductive thin wires are omitted.
- the heat conductive sheet member 364 has an upper part 364a, a lower part 364b, and a side part 364c.
- the upper part 364a exists in the third region 163 that is the same as the upper part 164a described in the first modification of the fifth embodiment.
- the lower part 364b exists on the mounting surface 1 la as in the third embodiment, and exists outside the semiconductor element 3! /. Even in such a case, thermal separation can be performed.
- FIGS. 22 (a) and 22 (b) are diagrams showing a method for manufacturing a semiconductor module that is effective in this modification.
- the support 61 and the second substrate are mounted on the mounting surface 11a of the cooling medium 1.
- the semiconductor element 3 is mounted on the mounting surface 11a, and the electronic component 2 is mounted on the second substrate 62 (step (a)).
- the conductive element (not shown) is used to electrically connect the semiconductor element 3 and the electrode terminal (not shown) provided on the cooling medium 1.
- an insulating member 6 is injected into the upper surface 3a of the semiconductor element 3 to cover the upper surface 3a and its conductive thin wires (not shown).
- the electronic component 2 and the electrode terminal (not shown) provided on the second substrate 62 are electrically connected using a conductive thin wire.
- the first side surface 3 c of the semiconductor element 3 is covered with a heat conductive sheet member 364.
- one end 41 side of the heat conductive sheet member 364 is brought into contact with the mounting surface 11a of the cooling medium 1, and heat conduction is performed so that the other end 42 of the heat conductive sheet member 364 exists in the third region 163.
- the flexible sheet member 364 is bent (step (b)).
- the heat conductive sheet member 364 has a heat conductive sheet member 364 so that the area of the portion in contact with the mounting surface 11a is 1/5 or more of the surface area of the heat conductive sheet member 364. 364 is preferably provided. This makes it possible to manufacture the semiconductor module 360, which is powerful in this modification.
- the shape of the heat conductive sheet member may be the shape shown in the third embodiment (Fig. 7) or the second and third modifications of the third embodiment (Figs. 11 and 12). Good. Further, the heat conductive sheet member may be bent so that the side portion exists on the opposite side of the support member with the semiconductor element being separated.
- Embodiments 1 to 5 may be configured as follows.
- the cooling medium may have a cooling path for cooling the substrate instead of having the cooling fins.
- liquid such as water or oil or air may be used.
- the cooling medium may have a configuration in which the cooling path is embedded in the substrate.
- the semiconductor module which may be sealed by a package a known one can be used without particular limitation, for example, a resin-sealed package, a ceramic package, a metal package, a glass package, or the like. Is mentioned.
- a hole may be opened in the lower part. If the hole is formed in the lower part, the hole can be filled with a conductive adhesive such as solder, and the target component can be fixed to the cooling medium via the conductive adhesive. As described in Embodiment 1 above, the holes The surface area of the lower part where the is formed is preferably 1/5 or more of the total surface area.
- the number of semiconductor elements and electronic components in the semiconductor module is not limited to the above description. In either case, a part of the semiconductor element or the electronic component may be covered with a heat conductive sheet member so that heat separation can be performed between the semiconductor element and the electronic component.
- the heat conductive sheet member may have a force S that a single sheet is bent, and a plurality of sheet members.
- the upper part, the lower part and the side part are made of different sheet parts, and these sheet members are connected to each other! /.
- the timing for mounting the electronic component is not limited to the above timing.
- Example 1 a semiconductor module that is substantially the same as the semiconductor module according to Embodiment 1 (hereinafter referred to as “semiconductor module of this example”) was used.
- semiconductor module of the reference example shown in Fig. 23 was used.
- the semiconductor module of this example was manufactured according to the method described in the first embodiment. At this time, a hole is formed in the heat conductive sheet member prepared in the step shown in FIG. 3 (a). In the step shown in FIG. 3 (b), the hole is filled with solder and the semiconductor is covered with the hole. An element was set up.
- the distance between the semiconductor element and the electronic component was set to be substantially the same as the distance between the semiconductor element and the electronic component in the semiconductor module of this example. That is, in the semiconductor module of the reference example used in this example, the distance was shorter than that shown in FIG.
- the temperature of the cooling medium was set to 85 ° C, and the semiconductor module of this example and the semiconductor module of the reference example were operated. After the operation was completed, the temperatures of the semiconductor elements and electronic components in each module were measured. Then, in the semiconductor module of this example However, the temperature of the semiconductor device was about 120 ° C, and the temperature of the electronic components was kept below 90 ° C. On the other hand, in the semiconductor module of the reference example, the temperature of the electronic component was about 110 ° C.
- a semiconductor module and a semiconductor module of this example are prepared by arranging a heat conductive sheet member! /, And a semiconductor element of each module is switched at 100 kHz.
- the electronic noise was measured at a position 5 cm away from the semiconductor module. As a result, the electronic noise could be reduced by an order of magnitude or more by arranging the heat conductive sheet member.
- Example 2 the semiconductor module according to Embodiment 2 was used. That is, the semiconductor module shown in FIG. 6 was used.
- the temperature of the cooling medium was set to 85 ° C, and the semiconductor module was operated.
- the temperature of the semiconductor elements was about 120 ° C, and the temperature of the electronic parts was kept below 90 ° C!
- Example 3 two semiconductor modules according to the third embodiment, that is, the semiconductor module shown in FIG. 7 and the semiconductor module shown in FIG. 13 were used.
- the temperature of the cooling medium was set to 85 ° C., and the semiconductor module was operated. .
- the temperature of the semiconductor elements and electronic components was measured after the operation was completed, the temperature of the semiconductor elements in the semiconductor module shown in FIG. 7 was about 120 ° C, and the temperature of the electronic components was kept below 90 ° C. .
- the temperature of the semiconductor element was about 120 ° C, and the temperature of the electronic component was 90 ° C or less.
- Example 4 a semiconductor module substantially the same as the semiconductor module according to Embodiment 4 was used. That is, the semiconductor module shown in FIG. 14 was used.
- the semiconductor module according to Embodiment 4 was manufactured.
- the above implementation As described in Example 1, a hole was formed in the thermally conductive sheet member, and a semiconductor element was arranged so that the hole was filled with solder and the hole was covered.
- the temperature of the cooling medium was set to 85 ° C and each semiconductor module was operated.
- the temperature of the semiconductor elements and electronic components was measured after the operation was completed, the temperature of the semiconductor elements was about 120 ° C, and the temperature of the electronic components was kept below 90 ° C!
- a semiconductor element and an electronic component can be integrated, and a low loss, small size, and low cost semiconductor module can be provided.
- the semiconductor module of the present invention is preferably used for a semiconductor module provided with a semiconductor element composed of a wide band gap semiconductor element such as silicon carbide, GaN, diamond or the like.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US12/373,024 US8030758B2 (en) | 2006-09-20 | 2007-09-13 | Semiconductor module and method for fabricating semiconductor module |
CN2007800254612A CN101484990B (zh) | 2006-09-20 | 2007-09-13 | 半导体模块及半导体模块的制造方法 |
JP2008506882A JP4146888B2 (ja) | 2006-09-20 | 2007-09-13 | 半導体モジュールと半導体モジュールの製造方法 |
Applications Claiming Priority (2)
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JP2006254173 | 2006-09-20 | ||
JP2006-254173 | 2006-09-20 |
Publications (1)
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WO2008035614A1 true WO2008035614A1 (fr) | 2008-03-27 |
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ID=39200441
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2007/067841 WO2008035614A1 (fr) | 2006-09-20 | 2007-09-13 | Module à semi-conducteur et procédé de fabrication du module à semi-conducteur |
Country Status (4)
Country | Link |
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US (1) | US8030758B2 (ja) |
JP (1) | JP4146888B2 (ja) |
CN (1) | CN101484990B (ja) |
WO (1) | WO2008035614A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2012070289A1 (ja) * | 2010-11-26 | 2012-05-31 | 三菱電機株式会社 | 熱伝導性シート及びパワーモジュール |
Families Citing this family (6)
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KR101292643B1 (ko) * | 2011-10-26 | 2013-08-02 | 성균관대학교산학협력단 | 그래핀을 포함하는 전자파 감쇄 및 방열용 필름 및 이를 포함하는 전자기 소자 |
US8811015B2 (en) * | 2012-02-16 | 2014-08-19 | Mission Motor Company | Motor control device |
US9390998B2 (en) * | 2012-02-17 | 2016-07-12 | Invensas Corporation | Heat spreading substrate |
US9521738B1 (en) * | 2013-12-23 | 2016-12-13 | Flextronics Ap, Llc | Graphite sheet to protect SMT components from thermal exposure |
US9789572B1 (en) | 2014-01-09 | 2017-10-17 | Flextronics Ap, Llc | Universal automation line |
DE102015113873B3 (de) * | 2015-08-21 | 2016-07-14 | Semikron Elektronik Gmbh & Co. Kg | Leistungselektronische Baugruppe mit Kondensatoreinrichtung |
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JP2005251994A (ja) * | 2004-03-04 | 2005-09-15 | Hitachi Cable Ltd | 光モジュールの放熱構造 |
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US4103737A (en) * | 1976-12-16 | 1978-08-01 | Marantz Company, Inc. | Heat exchanger structure for electronic apparatus |
US4508163A (en) * | 1983-01-18 | 1985-04-02 | Aavid Engineering, Inc. | Heat sinks for integrated circuit modules |
JP2656416B2 (ja) * | 1991-12-16 | 1997-09-24 | 三菱電機株式会社 | 半導体装置および半導体装置の製造方法、並びに半導体装置に用いられる複合基板および複合基板の製造方法 |
JP2000077580A (ja) * | 1998-08-28 | 2000-03-14 | Nissan Motor Co Ltd | 温度制御型半導体装置 |
US6538892B2 (en) * | 2001-05-02 | 2003-03-25 | Graftech Inc. | Radial finned heat sink |
JP4113442B2 (ja) * | 2002-05-09 | 2008-07-09 | ローム株式会社 | 半導体レーザ、その製法および光ピックアップ装置 |
JP2005235929A (ja) | 2004-02-18 | 2005-09-02 | Mitsubishi Electric Corp | 電力変換器 |
US7291869B2 (en) * | 2006-02-06 | 2007-11-06 | Infieon Technologies A.G. | Electronic module with stacked semiconductors |
-
2007
- 2007-09-13 WO PCT/JP2007/067841 patent/WO2008035614A1/ja active Application Filing
- 2007-09-13 CN CN2007800254612A patent/CN101484990B/zh not_active Expired - Fee Related
- 2007-09-13 US US12/373,024 patent/US8030758B2/en not_active Expired - Fee Related
- 2007-09-13 JP JP2008506882A patent/JP4146888B2/ja not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2005251994A (ja) * | 2004-03-04 | 2005-09-15 | Hitachi Cable Ltd | 光モジュールの放熱構造 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2012070289A1 (ja) * | 2010-11-26 | 2012-05-31 | 三菱電機株式会社 | 熱伝導性シート及びパワーモジュール |
JPWO2012070289A1 (ja) * | 2010-11-26 | 2014-05-19 | 三菱電機株式会社 | 熱伝導性シート及びパワーモジュール |
Also Published As
Publication number | Publication date |
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CN101484990B (zh) | 2011-07-20 |
CN101484990A (zh) | 2009-07-15 |
JP4146888B2 (ja) | 2008-09-10 |
US8030758B2 (en) | 2011-10-04 |
US20090309215A1 (en) | 2009-12-17 |
JPWO2008035614A1 (ja) | 2010-01-28 |
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