WO2014006724A1 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- WO2014006724A1 WO2014006724A1 PCT/JP2012/067219 JP2012067219W WO2014006724A1 WO 2014006724 A1 WO2014006724 A1 WO 2014006724A1 JP 2012067219 W JP2012067219 W JP 2012067219W WO 2014006724 A1 WO2014006724 A1 WO 2014006724A1
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Definitions
- the present invention relates to a resin-sealed semiconductor device sealed with a mold resin.
- the method of providing grooves or protrusions on the metal base plate cannot be applied to a structure in which the shape of the metal base plate is complicated and the metal base plate is not used. Further, in the method of providing the coating film in the entire region, it is necessary to make a correction such as an inspection of the occurrence of an unpainted portion in all the regions or re-application to the unpainted portion. For this reason, there existed a problem that manufacture was difficult.
- the present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a semiconductor device that can prevent peeling, improve reliability, and can be easily manufactured.
- the semiconductor device includes an insulating substrate having first and second main surfaces facing each other, a circuit pattern bonded to the first main surface of the insulating substrate, and the second of the insulating substrate.
- a cooling body bonded to the main surface, a semiconductor element mounted on the circuit pattern, a bonding portion between the insulating substrate and the circuit pattern, and a coating film covering the bonding portion between the insulating substrate and the cooling body;
- the insulating substrate, the circuit pattern, the semiconductor element, the cooling body, and a resin that seals the coating film, the insulating substrate has a higher thermal conductivity than the coating film, the coating film,
- the hardness is lower than that of the resin, the stress applied to the insulating substrate from the resin is relieved, and at least one of the circuit pattern and the cooling body is not covered with the coating film and is not covered with the resin. Characterized in that it has grooves or protrusions to.
- a semiconductor device that can prevent peeling, improve reliability, and can be easily manufactured can be obtained.
- FIG. 1 is a cross-sectional view showing a semiconductor device according to the first embodiment of the present invention.
- FIG. 2 is a plan view showing a structure on a ceramic substrate of the apparatus of FIG.
- the ceramic substrate 1 has an upper surface and a lower surface that face each other.
- a circuit pattern 2 is bonded to the upper surface of the ceramic substrate 1.
- a metal cooling body 3 is bonded to the lower surface of the ceramic substrate 1.
- IGBT4 Insulated Gate Bipolar Transistor
- FWD5 Free Wheeling Diode
- the collector electrode 6 of the IGBT 4 and the cathode electrode 7 of the FWD 5 are joined to the upper surface of the circuit pattern 2 by solder 8.
- the emitter electrode 9 of the IGBT 4 and the anode electrode 10 of the FWD 5 are joined to the high voltage electrode 12 by solder 11.
- the gate electrode 13 of the IGBT 4 is electrically connected to the signal electrode 15 by an aluminum wire 14.
- a control signal is input to the IGBT 4 through the signal electrode 15 from a higher system (not shown).
- the coating film 16 covers the joint between the ceramic substrate 1 and the circuit pattern 2 and the joint between the ceramic substrate 1 and the cooling body 3.
- a mold resin 17 seals the ceramic substrate 1, the circuit pattern 2, the IGBT 4, the FWD 5, the cooling body 3, the coating film 16, and the like.
- etc. Is insulated from the outside.
- the lower surface of the cooling body 3 is exposed from the mold resin 17.
- the IGBT 4 and the FWD 5 are cooled by cooling the lower surface of the cooling body 3 with a heat sink (not shown).
- the ceramic substrate 1 is, for example, AlN, alumina, SiN or the like.
- the coating film 16 is, for example, a polyimide resin (linear expansion coefficient of about 50 ppm, elastic coefficient of about 2.6 GPa).
- the mold resin 17 is, for example, an epoxy resin (linear expansion coefficient of about 16 ppm, elastic coefficient of about 16 GPa).
- the circuit pattern 2, the high voltage electrode 12, and the cooling body 3 are, for example, Cu.
- the ceramic substrate 1 has a higher thermal conductivity than the coating film 16.
- the coating film 16 has a lower hardness than the mold resin 17 and relieves stress applied to the ceramic substrate 1 from the mold resin 17.
- the circuit pattern 2 and the cooling body 3 have grooves 18 that are not covered with the coating film 16 and are in contact with the mold resin 17.
- Heat dissipation can be ensured by mounting the IGBT 4 and the FWD 5 on the ceramic substrate 1 having high thermal conductivity. Further, by covering the ceramic substrate 1 with the coating film 16 having a hardness lower than that of the mold resin 17, stress applied from the mold resin 17 to the ceramic substrate 1 can be relieved, so that reliability can be improved.
- the coating film 16 does not need to be applied to the entire surface, and only a necessary portion may be applied. Therefore, it is possible to perform processing in which a necessary portion including an unnecessary portion is always applied. Further, even when the occurrence of unpainted portions of the coating film 16 is inspected or reworked, the target area becomes small. As a result, labor can be saved and manufacturing is easy.
- At least one wedge-shaped groove 18 is provided in the circuit pattern 2 and the cooling body 3.
- the mold resin 17 can be prevented from peeling by the mold resin 17 entering the groove 18.
- a wedge-shaped protrusion may be provided instead of the groove 18.
- the present invention is not limited to this, and it is only necessary that at least one of the circuit pattern 2 and the cooling body 3 is provided with a groove or a protrusion.
- FIG. 3 is a cross-sectional view showing a modification of the semiconductor device according to the first embodiment of the present invention.
- the lateral width of the cooling body 3 is equal to or greater than the lateral width of the ceramic substrate 1. Accordingly, the ceramic substrate 1 is entirely contained in the region of the cooling body 3 in plan view. Thereby, since the stress applied to the ceramic substrate 1 can be surely released to the cooling body 3, the reliability can be further improved.
- FIG. FIG. 4 is a plan view showing the structure on the ceramic substrate of the semiconductor device according to the second embodiment of the present invention.
- the coating film 16 surrounds a region where the IGBT 4 and the FWD 5 are mounted on the upper surface of the circuit pattern 2.
- the coating film 16 serves as a resist for positioning when soldering the IGBT 4 and the FWD 5. For this reason, since it is not necessary to form a resist separately from the coating film 16, a manufacturing process can be reduced.
- FIG. 5 is a sectional view showing a semiconductor device according to the third embodiment of the present invention.
- FIG. 6 is a plan view showing a ceramic substrate of the apparatus of FIG.
- the insulating substrate 19 includes an insulating plate 20 disposed immediately below the IGBT 4 and the FWD 5 and its peripheral region, and an insulating resin 21 disposed between the mold resin 17 and the insulating plate 20. Strictly speaking, the insulating plate 20 is disposed in a heat conduction range that extends by 45 degrees from the mounting position of the IGBT 4 and the FWD 5.
- the insulating plate 20 is, for example, AlN, alumina, SiN or the like.
- the insulating resin 21 is, for example, a polyimide resin (linear expansion coefficient of about 50 ppm, elastic coefficient of about 2.6 GPa). Therefore, the insulating plate 20 has a higher thermal conductivity than the insulating resin 21.
- the insulating resin 21 has a lower hardness than the mold resin 17 and relieves stress applied to the insulating plate 20 from the mold resin 17.
- the insulating plate 20 having a high thermal conductivity is disposed immediately below the IGBT 4 and the FWD 5 and in the peripheral region thereof, heat dissipation can be ensured. Further, since the insulating resin 21 having a low hardness is disposed between the mold resin 17 and the insulating plate 20, the stress applied from the mold resin 17 to the insulating plate 20 can be relaxed, and the reliability can be improved.
- the width of the cooling body 3 is equal to or greater than the width of the ceramic substrate 1.
- the IGBT 4 and the FWD 5 are not limited to those formed of silicon, but may be formed of a wide band gap semiconductor having a larger band gap than silicon.
- the wide band gap semiconductor is, for example, silicon carbide, a gallium nitride-based material, or diamond.
- a power semiconductor element formed of such a wide band gap semiconductor can be miniaturized because of its high voltage resistance and allowable current density. By using this miniaturized element, a semiconductor device incorporating this element can also be miniaturized.
- the heat resistance of the element is high, the heat dissipating fins of the heat sink can be reduced in size and the water cooling part can be cooled in the air, so that the semiconductor device can be further reduced in size.
- the semiconductor device since the power loss of the element is low and the efficiency is high, the semiconductor device can be highly efficient.
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Abstract
Description
図1は、本発明の実施の形態1に係る半導体装置を示す断面図である。図2は、図1の装置のセラミック基板上の構造を示す平面図である。セラミック基板1は互いに対向する上面及び下面を持つ。回路パターン2がセラミック基板1の上面に接合されている。金属製の冷却体3がセラミック基板1の下面に接合されている。
図4は、本発明の実施の形態2に係る半導体装置のセラミック基板上の構造を示す平面図である。コーティング膜16は、回路パターン2の上面においてIGBT4とFWD5が実装される領域の周囲を囲っている。これにより、コーティング膜16はIGBT4とFWD5の半田付け時の位置決めのためのレジストの役割を持つ。このため、コーティング膜16とは別個にレジストを形成する必要がないため、製造工程を削減することができる。
図5は、本発明の実施の形態3に係る半導体装置を示す断面図である。図6は、図5の装置のセラミック基板を示す平面図である。絶縁基板19は、IGBT4とFWD5の直下及びその周辺領域に配置された絶縁板20と、モールド樹脂17と絶縁板20の間に配置された絶縁樹脂21とを有する。厳密に言うと、絶縁板20は、IGBT4とFWD5の実装位置から45度角で広がる熱伝導範囲に配置されている。
2 回路パターン
3 冷却体
4 IGBT(半導体素子)
5 FWD(半導体素子)
6 コレクタ電極(下面電極)
7 カソード電極(下面電極)
8 半田
16 コーティング膜
17 モールド樹脂
18 溝
20 絶縁板(第1の部分)
21 絶縁樹脂(第2の部分)
Claims (4)
- 互いに対向する第1及び第2の主面を持つ絶縁基板と、
前記絶縁基板の前記第1の主面に接合された回路パターンと、
前記絶縁基板の前記第2の主面に接合された冷却体と、
前記回路パターン上に実装された半導体素子と、
前記絶縁基板と前記回路パターンの接合部、及び前記絶縁基板と前記冷却体の接合部を覆うコーティング膜と、
前記絶縁基板、前記回路パターン、前記半導体素子、前記冷却体、及び前記コーティング膜を封止する樹脂とを備え、
前記絶縁基板は前記コーティング膜より熱伝導率が高く、
前記コーティング膜は、前記樹脂よりも硬度が低く、前記樹脂から前記絶縁基板にかかる応力を緩和し、
前記回路パターンと前記冷却体の少なくとも一方は、前記コーティング膜で覆われず前記樹脂に接する溝又は突起を有することを特徴とする半導体装置。 - 前記半導体素子の下面電極は前記回路パターンの上面に半田により接合され、
前記コーティング膜は、前記回路パターンの前記上面において前記半導体素子が実装される領域の周囲を囲うことを特徴とする請求項1に記載の半導体装置。 - 互いに対向する第1及び第2の主面を持つ絶縁基板と、
前記絶縁基板の前記第1の主面に接合された回路パターンと、
前記絶縁基板の前記第2の主面に接合された冷却体と、
前記回路パターン上に実装された半導体素子と、
前記絶縁基板、前記回路パターン、前記半導体素子、及び前記冷却体を封止する樹脂とを備え、
前記回路パターンと前記冷却体の少なくとも一方は、前記樹脂に接する溝又は突起を有し、
前記絶縁基板は、前記半導体素子の直下及びその周辺領域に配置された第1の部分と、前記樹脂と前記第1の部分の間に配置された第2の部分とを有し、
前記第1の部分は前記第2の部分より熱伝導率が高く、
前記第2の部分は、前記樹脂よりも硬度が低く、前記樹脂から前記第1の部分にかかる応力を緩和することを特徴とする半導体装置。 - 前記冷却体の横幅は前記絶縁基板の横幅以上であることを特徴とする請求項1~3の何れか1項に記載の半導体装置。
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