JP5852080B2 - Semiconductor device - Google Patents
Semiconductor device Download PDFInfo
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- JP5852080B2 JP5852080B2 JP2013229518A JP2013229518A JP5852080B2 JP 5852080 B2 JP5852080 B2 JP 5852080B2 JP 2013229518 A JP2013229518 A JP 2013229518A JP 2013229518 A JP2013229518 A JP 2013229518A JP 5852080 B2 JP5852080 B2 JP 5852080B2
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- 239000004065 semiconductor Substances 0.000 title claims description 134
- 239000000463 material Substances 0.000 claims description 93
- 238000007747 plating Methods 0.000 claims description 52
- 239000007787 solid Substances 0.000 claims description 40
- 239000002184 metal Substances 0.000 claims description 24
- 229910052751 metal Inorganic materials 0.000 claims description 24
- 238000002844 melting Methods 0.000 claims description 14
- 230000008018 melting Effects 0.000 claims description 14
- 229910045601 alloy Inorganic materials 0.000 claims description 13
- 239000000956 alloy Substances 0.000 claims description 13
- 229910020836 Sn-Ag Inorganic materials 0.000 claims description 8
- 229910020988 Sn—Ag Inorganic materials 0.000 claims description 8
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 229910052709 silver Inorganic materials 0.000 claims description 5
- 229910052737 gold Inorganic materials 0.000 claims description 4
- 229910052718 tin Inorganic materials 0.000 claims description 4
- -1 containing BiSn Substances 0.000 claims 1
- 230000000052 comparative effect Effects 0.000 description 19
- 230000017525 heat dissipation Effects 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000000155 melt Substances 0.000 description 7
- 229920005989 resin Polymers 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 229910052797 bismuth Inorganic materials 0.000 description 4
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229910001316 Ag alloy Inorganic materials 0.000 description 1
- 241000239290 Araneae Species 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- QCEUXSAXTBNJGO-UHFFFAOYSA-N [Ag].[Sn] Chemical compound [Ag].[Sn] QCEUXSAXTBNJGO-UHFFFAOYSA-N 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
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- H—ELECTRICITY
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- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L24/83—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector
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- H01L24/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L24/28—Structure, shape, material or disposition of the layer connectors prior to the connecting process
- H01L24/29—Structure, shape, material or disposition of the layer connectors prior to the connecting process of an individual layer connector
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- H01L2224/02—Bonding areas; Manufacturing methods related thereto
- H01L2224/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
- H01L2224/05—Structure, shape, material or disposition of the bonding areas prior to the connecting process of an individual bonding area
- H01L2224/0554—External layer
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- H01L2224/056—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron [B], silicon [Si], germanium [Ge], arsenic [As], antimony [Sb], tellurium [Te] and polonium [Po], and alloys thereof
- H01L2224/05638—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron [B], silicon [Si], germanium [Ge], arsenic [As], antimony [Sb], tellurium [Te] and polonium [Po], and alloys thereof the principal constituent melting at a temperature of greater than or equal to 950°C and less than 1550°C
- H01L2224/05639—Silver [Ag] as principal constituent
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- H01L2224/291—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron [B], silicon [Si], germanium [Ge], arsenic [As], antimony [Sb], tellurium [Te] and polonium [Po], and alloys thereof
- H01L2224/29101—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron [B], silicon [Si], germanium [Ge], arsenic [As], antimony [Sb], tellurium [Te] and polonium [Po], and alloys thereof the principal constituent melting at a temperature of less than 400°C
- H01L2224/29113—Bismuth [Bi] as principal constituent
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- H01L2224/31—Structure, shape, material or disposition of the layer connectors after the connecting process
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- H01L2224/32151—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/32221—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/32245—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic
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- H01L2224/4809—Loop shape
- H01L2224/48091—Arched
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- H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
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- H01L2224/48247—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic connecting the wire to a bond pad of the item
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- H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
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- H01L2224/8338—Bonding interfaces outside the semiconductor or solid-state body
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- H01L2224/834—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron [B], silicon [Si], germanium [Ge], arsenic [As], antimony [Sb], tellurium [Te] and polonium [Po], and alloys thereof
- H01L2224/83438—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron [B], silicon [Si], germanium [Ge], arsenic [As], antimony [Sb], tellurium [Te] and polonium [Po], and alloys thereof the principal constituent melting at a temperature of greater than or equal to 950°C and less than 1550°C
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Description
本発明は、半導体装置に関する。 The present invention relates to semiconductor equipment.
従来、環境負荷の観点から、半導体装置における鉛の使用量の低減が要求されている。たとえば、2006年7月施行のRoHS(Restriction of Hazardous Substances)指令などによって提唱されている。
半導体装置では、たとえば、SOP(Small Outline Package)、QFP(Quad Flat Package)におけるアウターリードの外装めっき、BGA(Ball Grid Array)における半田ボールなど、装置外部で使用される外部構成材、およびパッケージ内部における半導体チップの接合材など、装置内部で使用される内部構成材に鉛が使用されている。
Conventionally, reduction of the amount of lead used in semiconductor devices has been required from the viewpoint of environmental impact. For example, it has been proposed by the RoHS (Restriction of Hazardous Substances) Directive, which came into effect in July 2006.
In semiconductor devices, for example, external component materials used outside the device, such as outer plating of outer leads in SOP (Small Outline Package), QFP (Quad Flat Package), solder balls in BGA (Ball Grid Array), and the inside of the package Lead is used as an internal constituent material used inside the apparatus, such as a semiconductor chip bonding material.
外部構成材については、鉛の含有量を一定比率以下とする鉛フリー化が、代替材料の研究によってほぼ達成されている。これに対し、内部構成材については、代替に適した材料がない。そのため、たとえば、95Pb−5Sn(鉛含有量95wt%)など、鉛含有率の高い金属が使用されている。 For external components, lead-free material with lead content below a certain ratio has been almost achieved through research on alternative materials. On the other hand, there is no material suitable for substitution for internal components. Therefore, for example, metals with high lead content such as 95Pb-5Sn (lead content 95 wt%) are used.
様々な組成の金属材料を、内部構成材の代替材料として評価する過程において、環境負荷の小さいビスマスが、代替材料の選択肢として着目される。ビスマスは、たとえば、装置内部で使用される接合材に要求される融点や接合性、さらには環境負荷の諸特性を満たす。
しかし、ビスマスの熱伝導率(約9W/m・K)は、鉛の熱伝導率(約35W/m・K)に比べて低い。そのため、ビスマスを単に使用したのでは、半導体チップで生じる熱が放散されにくいといった不具合を生じる。
In the process of evaluating metal materials having various compositions as substitute materials for internal components, bismuth with a small environmental load is attracting attention as an alternative material option. Bismuth, for example, satisfies various characteristics such as melting point and bondability required for a bonding material used inside the apparatus, and environmental load.
However, the thermal conductivity of bismuth (about 9 W / m · K) is lower than that of lead (about 35 W / m · K). Therefore, simply using bismuth causes a problem that heat generated in the semiconductor chip is not easily dissipated.
本発明の目的は、半導体チップの放熱性を十分に確保できながら、半導体チップの接合材の鉛フリー化を達成することができる半導体装置を提供することにある。 An object of the present invention is to be sufficient heat dissipation of the semiconductor chip is to provide a semiconductor equipment which can achieve lead-free of the bonding material of the semiconductor chip.
上記目的を達成するための本発明は、半導体チップと、前記半導体チップが接合される固体板と、前記半導体チップと前記固体板との間に介在され、BiSn系材料からなる接合材とを含み、前記接合材は、前記半導体チップと前記固体板との間の熱伝導性を向上させるためのAgからなる熱伝導経路を有しており、前記熱伝導経路は、前記半導体チップにおける前記固体板との対向面に対して垂直方向に延びており、かつ前記半導体チップから前記固体板に達するように形成されている、半導体装置である。 The present invention for achieving the above object includes a semiconductor chip, a solid plate to which the semiconductor chip is bonded, and a bonding material that is interposed between the semiconductor chip and the solid plate and is made of a BiSn-based material. The bonding material has a heat conduction path made of Ag for improving the thermal conductivity between the semiconductor chip and the solid plate, and the heat conduction path is the solid plate in the semiconductor chip. The semiconductor device is formed so as to extend in a direction perpendicular to the facing surface of the semiconductor chip and to reach the solid plate from the semiconductor chip.
この構成によれば、半導体チップと固体板とを接合する接合材がBiSn系材料からなるので、接合材の鉛フリー化を達成することができる。
さらに、半導体チップと固体板との間が、Agからなる熱伝導経路によって熱伝導可能に接続されている。これにより、半導体チップと固体板との間を熱が伝達しやすくなる。そのため、半導体チップで発生する熱を、熱伝導経路を介してAgの熱伝導率で固体板に逃がすことができる。したがって、半導体チップの放熱性を十分に確保することができる。
According to this configuration, since the bonding material for bonding the semiconductor chip and the solid plate is made of the BiSn material, lead-free bonding material can be achieved.
Furthermore, the semiconductor chip and the solid plate are connected so as to be able to conduct heat through a heat conduction path made of Ag. This facilitates heat transfer between the semiconductor chip and the solid plate. Therefore, the heat generated in the semiconductor chip can be released to the solid plate with the thermal conductivity of Ag through the heat conduction path. Therefore, sufficient heat dissipation of the semiconductor chip can be ensured.
また、本発明では、前記接合材における前記半導体チップおよび/または前記固体板との界面近傍には、Sn−Ag合金からなる金属層が形成されていてもよい。
この構成では、接合材における半導体チップおよび/または固体板との界面近傍に、Sn−Ag合金からなる金属層が形成されている。金属に対するSn−Ag合金の濡れ性は、BiSn系材料の濡れ性よりも優れている。そのため、この金属層によって、接合材と、半導体チップおよび/または固体板との接合強度を向上させることができる。
In the present invention, a metal layer made of a Sn—Ag alloy may be formed in the vicinity of the interface between the bonding material and the semiconductor chip and / or the solid plate.
In this configuration, a metal layer made of an Sn—Ag alloy is formed in the vicinity of the interface between the bonding material and the semiconductor chip and / or the solid plate. The wettability of the Sn—Ag alloy with respect to the metal is superior to the wettability of the BiSn-based material. Therefore, the bonding strength between the bonding material and the semiconductor chip and / or the solid plate can be improved by the metal layer.
また、本発明では、前記接合材におけるSnの含有量が、0wt%を超過し、4wt%以下であってもよい。
SnはAgと合金化し易い金属であるが、上記のように、接合材におけるSnの含有量が上記範囲であれば、熱伝導経路の形成に寄与するAgの不要な合金化を抑制することができる。その結果、熱伝導経路を効率よく形成することができる。
Further, in the present invention, the content of Sn in the bonding material, exceed 0 wt%, may I der following 4 wt%.
Sn is a metal that is easily alloyed with Ag. However, as described above, if the Sn content in the bonding material is within the above range, it is possible to suppress unnecessary alloying of Ag that contributes to the formation of the heat conduction path. it can. As a result, the heat conduction path can be efficiently formed.
また、Bi(融点:約270℃)がSn(融点:約232℃)よりも多量に含有されるため、接合材に比較的高い融点を保持させることができる。そのため、半導体装置を実装するときのリフロー時において、優れた耐リフロー性を発揮することができる。
また、本発明では、前記固体板が金属からなるリードフレームのアイランドであってもよい。
Further, since Bi (melting point: about 270 ° C.) is contained in a larger amount than Sn (melting point: about 232 ° C.), the bonding material can maintain a relatively high melting point. Therefore, excellent reflow resistance can be exhibited during reflow when mounting the semiconductor device.
In the present invention, the solid plate may be I Oh in the island of a lead frame made of a metal.
この構成では、固体板が金属からなるアイランドなので、Agめっきを容易に施すことができ、そのAgめっきから熱伝導経路を形成することができる。
また、本発明では、前記半導体チップと前記固体板との間は、前記熱伝導経路によって、Agの熱伝導率で熱伝導可能に接続されていてもよい。
In this configuration, since the solid plate is an island made of metal, Ag plating can be easily performed, and a heat conduction path can be formed from the Ag plating.
In the present invention, between the semiconductor chip and the solid plate by the heat conduction path may be thermally conductively connected with the thermal conductivity of Ag.
また、本発明では、前記固体板は、Cuからなっていてもよい。
また、本発明では、前記半導体チップは、300〜400μm厚の四角板状に形成されていてもよい。
また、本発明では、前記接合材は、BiSnを主として含有していてもよい。
In the present invention, the solid plate may have I Cu Tona.
In the present invention, the semiconductor chip may be formed in a square plate shape having a thickness of 300 to 400 μm.
In the present invention, the bonding material may also contain primarily the BiSn.
また、本発明では、前記半導体チップにおける前記接合材との接合面には、Au、Ni、Agを含有する裏面メタルが形成されていてもよい。
また、本発明では、前記裏面メタル上に、Agからなるチップめっき層が形成されていてもよい。
Moreover, in this invention, the back surface metal containing Au, Ni, and Ag may be formed in the joint surface with the said joining material in the said semiconductor chip.
In the present invention, a chip plating layer made of Ag may be formed on the back metal.
また、本発明では、前記チップめっき層の厚さは、0.1〜2.0μmであってもよい。
また、本発明では、前記固体板が、前記半導体チップをダイボンディングするダイパッドであり、前記ダイパッド上には、1.0〜10.0μmの厚さを有するパッドめっき層が形成されていてもよい。
In the present invention, the thickness of the chip plating layer may it 0.1~2.0μm der.
In the present invention, the solid plate, said a die pad of the semiconductor chip is die-bonded, onto the die pad, be formed pad plating layer having a thickness of 1.0~10.0μm Good .
また、本発明では、前記接合材は、SnよりもBiを多く含有していてもよい。
また、本発明では、前記接合材は、Ag、Sn、Co、Cu、Au、Ni、Znの少なくとも一種からなる副成分を含有していてもよい。
In the present invention, the bonding material may contain a large amount of Bi than Sn.
In the present invention, the bonding material, Ag, Sn, Co, Cu , Au, Ni, may contain auxiliary component composed of at least one of Zn.
また、本発明では、前記接合材の融点が、260〜270℃であってもよい。
また、本発明では、前記接合材の融点が、260〜263℃であってもよい。
また、本発明の半導体装置は、半導体チップおよびその半導体チップが接合される固体板を備える半導体装置の製造方法であって、前記半導体チップおよび前記固体板の少なくとも一方における他方との接合面に、Agからなるめっき層を形成する工程と、前記めっき層形成後、前記半導体チップと前記固体板との間に、Snの含有量が0wt%を超過し、4wt%以下であるBiSnからなる接合材を挟む工程と、熱処理により、前記半導体チップと前記固体板とを前記接合材を介して接合することによって、前記半導体チップにおける前記固体板との対向面に対して垂直方向に延びる熱伝導経路を前記接合材内に形成する工程とを含む、半導体装置の製造方法によって製造することができる。
In the present invention, the melting point of the bonding material may be I 260-270 ° C. der.
In the present invention, the melting point of the bonding material may be I 260 to 263 ° C. der.
Further, the semiconductor device of the present invention is a method of manufacturing a semiconductor device comprising a semiconductor chip and a solid plate to which the semiconductor chip is bonded, and a bonding surface with the other of at least one of the semiconductor chip and the solid plate, A step of forming a plating layer made of Ag, and a bonding material made of BiSn having a Sn content exceeding 0 wt% and not more than 4 wt% between the semiconductor chip and the solid plate after the plating layer is formed A heat conduction path extending in a direction perpendicular to the surface of the semiconductor chip facing the solid plate by bonding the semiconductor chip and the solid plate through the bonding material by heat treatment. It can be manufactured by a manufacturing method of a semiconductor device including a step of forming in the bonding material.
この方法によれば、半導体チップにおける接合面および/または固体板における接合面にAgからなるめっき層が形成された後、半導体チップと固体板との間に、Snの含有量が0wt%を超過し、4wt%以下であるBiSnからなる接合材が挟まれ、その後、熱処理される。上記の工程が実行されることによって、めっき層から他方の接合面に達するAgネットワーク(網状組織)を接合材に形成することができる。このAgネットワークによって、半導体チップと固体板との間の熱伝導性を向上させることができる。 According to this method, the Sn content exceeds 0 wt% between the semiconductor chip and the solid plate after the plating layer made of Ag is formed on the bonding surface of the semiconductor chip and / or the bonding surface of the solid plate. Then, a bonding material made of BiSn of 4 wt% or less is sandwiched and then heat-treated. By performing the above steps, an Ag network (network structure) reaching the other joint surface from the plating layer can be formed in the joint material. By this Ag network, the thermal conductivity between the semiconductor chip and the solid plate can be improved.
そして、この製造方法によって得られる半導体装置によれば、接合材がBiSn系材料からなるので、接合材の鉛フリー化を達成することができる。
さらに、半導体チップと固体板との間がAgネットワークによって接続されるため、これらの間を熱が伝達しやすくなる。そのため、半導体チップで発生する熱を、Agネットワークを介してAgの熱伝導率で固体板に逃がすことができる。したがって、半導体チップの放熱性を十分に確保することができる。
According to the semiconductor device obtained by this manufacturing method, since the bonding material is made of a BiSn-based material, lead-free bonding material can be achieved.
Furthermore, since the semiconductor chip and the solid plate are connected by an Ag network, heat is easily transferred between them. Therefore, the heat generated in the semiconductor chip can be released to the solid plate with the thermal conductivity of Ag via the Ag network. Therefore, sufficient heat dissipation of the semiconductor chip can be ensured.
また、本発明の半導体装置を製造するための方法では、前記めっき層を形成する工程が、前記半導体チップにおける前記接合面および前記固体板における前記接合面の両方に前記めっき層を形成する工程であることが好ましい。
この方法では、半導体チップにおける接合面および固体板における接合面の両方にめっき層が形成される。そのため、いずれか一方の接合面にのみめっき層が形成される場合よりも、Agネットワークの密度を大きくすることができる。その結果、半導体チップの放熱性を向上させることができる。
Moreover, in the method for manufacturing the semiconductor device of the present invention, the step of forming the plating layer is a step of forming the plating layer on both the bonding surface of the semiconductor chip and the bonding surface of the solid plate. Preferably there is.
In this method, plating layers are formed on both the bonding surface of the semiconductor chip and the bonding surface of the solid plate. Therefore, the density of the Ag network can be increased as compared with the case where the plating layer is formed only on one of the joining surfaces. As a result, the heat dissipation of the semiconductor chip can be improved.
以下では、本発明の実施の形態を、添付図面を参照して詳細に説明する。
図1は、本発明の一実施形態に係る半導体装置の模式断面図である。
半導体装置1は、QFPが適用された半導体装置1である。半導体装置1は、半導体チップ2と、半導体チップ2に接合される固体板としてのダイパッド3と、半導体チップ2と電気的に接続される複数のリード4と、これらを封止する樹脂パッケージ5とを備えている。
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a schematic cross-sectional view of a semiconductor device according to an embodiment of the present invention.
The semiconductor device 1 is a semiconductor device 1 to which QFP is applied. The semiconductor device 1 includes a semiconductor chip 2, a die pad 3 as a solid plate bonded to the semiconductor chip 2, a plurality of leads 4 electrically connected to the semiconductor chip 2, and a resin package 5 for sealing them. It has.
半導体チップ2は、その内部に複数の機能素子を搭載している。半導体チップ2は、たとえば、300〜400μm厚の四角板状に形成され、機能素子と電気的に接続された配線パッド(図示せず)が厚さ方向一方面21に露出している。一方、半導体チップ2の他方面22には、たとえば、Au、Ni、Agなどを含有する裏面メタル(図示せず)が形成されている。 The semiconductor chip 2 has a plurality of functional elements mounted therein. For example, the semiconductor chip 2 is formed in a square plate shape having a thickness of 300 to 400 μm, and wiring pads (not shown) electrically connected to the functional elements are exposed on the one surface 21 in the thickness direction. On the other hand, a back metal (not shown) containing, for example, Au, Ni, Ag or the like is formed on the other surface 22 of the semiconductor chip 2.
その裏面メタル上には、Agからなるチップめっき層6が形成されている。チップめっき層6の厚さは、たとえば、0.1〜2.0μmである。
ダイパッド3は、たとえば、0.1〜5.0mm厚のCu薄板からなり、四角状に形成されている。ダイパッド3の厚さ方向一方面31には、Agからなるパッドめっき層7が形成されている。パッドめっき層7の厚さは、たとえば、1.0〜10.0μmである。
A chip plating layer 6 made of Ag is formed on the back metal. The thickness of the chip plating layer 6 is, for example, 0.1 to 2.0 μm.
The die pad 3 is made of, for example, a Cu thin plate having a thickness of 0.1 to 5.0 mm, and is formed in a square shape. A pad plating layer 7 made of Ag is formed on one surface 31 in the thickness direction of the die pad 3. The thickness of the pad plating layer 7 is, for example, 1.0 to 10.0 μm.
そして、半導体チップ2およびダイパッド3は、他方面22および一方面31が接合面として互いに対向した状態で、他方面22と一方面31との間に接合材8が介在することによって、互いに接合されている。すなわち、半導体チップ2は、一方面21を上方に向けた姿勢でダイパッド3に支持される。
接合材8は、BiSn系材料からなる。BiSn系材料は、BiSnを主として含有する材料である。BiSn系材料は、主成分BiSnの他に、たとえば、半導体チップ2ダイパッド3間の熱の伝達、接合材8の機械的物性の向上、接合材8の融点調節および接合材8の濡れ性の向上などといった目的で、Ag、Sn、Co、Cu、Au、Ni、Znなどの副成分を含有することができる。これら副成分は、単独で含有されていてもよいし、複数の金属が合金化した状態で含有されていてもよい。
The semiconductor chip 2 and the die pad 3 are bonded to each other by the bonding material 8 interposed between the other surface 22 and the one surface 31 with the other surface 22 and the one surface 31 facing each other as a bonding surface. ing. That is, the semiconductor chip 2 is supported by the die pad 3 with the one surface 21 facing upward.
The bonding material 8 is made of a BiSn material. A BiSn-based material is a material mainly containing BiSn. In addition to the main component BiSn, for example, the BiSn-based material transfers heat between the semiconductor chip 2 and the die pad 3, improves the mechanical properties of the bonding material 8, adjusts the melting point of the bonding material 8, and improves the wettability of the bonding material 8. For the purpose, it is possible to contain subcomponents such as Ag, Sn, Co, Cu, Au, Ni, and Zn. These subcomponents may be contained alone, or may be contained in a state where a plurality of metals are alloyed.
上記のように、接合材8にはSnが必ず含有され、BiSn成分におけるSnの含有量は、たとえば、0wt%を超過し、4wt%以下、好ましくは、1〜3wt%、さらに好ましくは、1.5〜2.5wt%である。
上記した副成分として、接合材8は、チップめっき層6およびパッドめっき層7の両方に接触する熱伝導経路としてのAgネットワーク9を有している。Agネットワーク9は、多数のAg細線が蜘蛛の巣状に広がってなり、接合材8のほぼ全域に達している。このAgネットワーク9によって、半導体チップ2とダイパッド3との間は理想的には、Agの熱伝導率(約425W/m・K)で熱伝導可能に接続されている。
As described above, the bonding material 8 always contains Sn, and the content of Sn in the BiSn component is, for example, more than 0 wt% and not more than 4 wt%, preferably 1 to 3 wt%, more preferably 1 .5 to 2.5 wt%.
As the above-described subcomponent, the bonding material 8 has an Ag network 9 as a heat conduction path that contacts both the chip plating layer 6 and the pad plating layer 7. In the Ag network 9, a large number of Ag thin lines spread in a spider web shape and reach almost the entire area of the bonding material 8. By the Ag network 9, the semiconductor chip 2 and the die pad 3 are ideally connected so as to be able to conduct heat at a thermal conductivity of Ag (about 425 W / m · K).
また、接合材8は、副成分として、チップめっき層6およびパッドめっき層7との界面近傍にSn−Ag合金からなる合金層10を有している。合金層10は、チップめっき層6およびパッドめっき層7の両方との界面近傍全域にわたって形成されていてもよいし、部分的に形成されていてもよい。
そして、上記のような接合材8の融点は、たとえば、260〜270℃、好ましくは、260〜263℃である。
Further, the bonding material 8 has an alloy layer 10 made of an Sn—Ag alloy in the vicinity of the interface between the chip plating layer 6 and the pad plating layer 7 as a subcomponent. The alloy layer 10 may be formed over the entire vicinity of the interface with both the chip plating layer 6 and the pad plating layer 7 or may be partially formed.
And the melting | fusing point of the above joining materials 8 is 260-270 degreeC, for example, Preferably, it is 260-263 degreeC.
リード4は、ダイパッド3と同じCu薄板(たとえば、0.1〜5.0mm厚)からなり、ダイパッド3の各側面と直交する各方向における両側に、それぞれ同数ずつ設けられている。ダイパッド3の各側面に対向するリード4は、その対向する側面と平行な方向に等間隔に配置されている。各リード4は、樹脂パッケージ5によって封止されたインナーリード41と、樹脂パッケージ5から露出したアウターリード42とを一体的に備えている。 The leads 4 are made of the same Cu thin plate (for example, 0.1 to 5.0 mm thick) as the die pad 3, and the same number is provided on both sides in each direction orthogonal to each side surface of the die pad 3. The leads 4 facing each side surface of the die pad 3 are arranged at equal intervals in a direction parallel to the facing side surface. Each lead 4 is integrally provided with an inner lead 41 sealed with a resin package 5 and an outer lead 42 exposed from the resin package 5.
インナーリード41は、ダイパッド3と同一平面上に配置され、ダイパッド3との対向方向に長尺な矩形状に形成されている。インナーリード41は、金属ワイヤ11を介して半導体チップ2の配線パッドと電気的に接続されている。
アウターリード42は、下方へ屈曲する屈曲部を有する略クランク形状に形成されている。アウターリード42は、半導体装置1をプリント配線基板に実装するときの外部接続部として機能する。
The inner lead 41 is disposed on the same plane as the die pad 3 and is formed in a rectangular shape that is long in the direction facing the die pad 3. The inner lead 41 is electrically connected to the wiring pad of the semiconductor chip 2 through the metal wire 11.
The outer lead 42 is formed in a substantially crank shape having a bent portion bent downward. The outer lead 42 functions as an external connection portion when the semiconductor device 1 is mounted on the printed wiring board.
樹脂パッケージ5としては、エポキシ樹脂など公知の材料を適用することができる。
上記のような半導体装置1は、その許容損失が、たとえば、1〜10W、好ましくは、4〜10Wである。許容損失は、半導体装置1の放熱性の指標とされる。また、半導体装置1は、プリント配線基板のランドにアウターリード42がはんだ接合され、たとえば、240〜260℃でリフローすることによって、実装することができる。
A known material such as an epoxy resin can be applied as the resin package 5.
The semiconductor device 1 as described above has an allowable loss of, for example, 1 to 10 W, preferably 4 to 10 W. The allowable loss is used as an index of heat dissipation of the semiconductor device 1. Further, the semiconductor device 1 can be mounted by soldering the outer leads 42 to the lands of the printed wiring board and performing reflow at 240 to 260 ° C., for example.
図2は、図1に示す半導体装置1の製造方法を工程順に示す図である。
半導体装置1の製造工程では、図2(a)に示すように、半導体チップ2およびリードフレーム12が用意される。
リードフレーム12は、Cu薄板を加工することにより形成される。このリードフレーム12は、格子状のフレーム部(図示せず)と、フレーム部に取り囲まれる各矩形領域内に配置されるアイランドとしてのダイパッド3と、ダイパッド3の周囲に配置される複数のリード4と、フレーム部とダイパッド3との間に架設された吊りリード(図示せず)とを一体的に備えている。
FIG. 2 is a diagram showing a method of manufacturing the semiconductor device 1 shown in FIG.
In the manufacturing process of the semiconductor device 1, as shown in FIG. 2A, the semiconductor chip 2 and the lead frame 12 are prepared.
The lead frame 12 is formed by processing a Cu thin plate. The lead frame 12 includes a lattice-shaped frame portion (not shown), a die pad 3 as an island disposed in each rectangular region surrounded by the frame portion, and a plurality of leads 4 disposed around the die pad 3. And a suspension lead (not shown) provided between the frame portion and the die pad 3 are integrally provided.
続いて、めっき法によって、半導体チップ2の他方面22(裏面メタル)およびダイパッド3の一方面31の両方にAgめっきが施される。これにより、チップめっき層6およびパッドめっき層7が形成される。なお、これらのめっき工程は、同じ工程で行なってもよいし、別工程で行なってもよい。
次いで、図2(b)に示すように、BiSnからなる接合材8をパッドめっき層7上に塗布し、その接合材8に対してチップめっき層6を対向させた姿勢で、半導体チップ2およびダイパッド3によって接合材8を挟み込む。
Subsequently, Ag plating is performed on both the other surface 22 (back surface metal) of the semiconductor chip 2 and the one surface 31 of the die pad 3 by plating. Thereby, the chip plating layer 6 and the pad plating layer 7 are formed. These plating steps may be performed in the same step or in separate steps.
Next, as shown in FIG. 2B, the bonding material 8 made of BiSn is applied onto the pad plating layer 7, and the semiconductor chip 2 and the chip plating layer 6 are opposed to the bonding material 8. The bonding material 8 is sandwiched between the die pads 3.
次いで、図2(c)に示すように、たとえば、280〜300℃でリフロー(熱処理)が行なわれる。これによって、接合材8にAgネットワーク9および合金層10が形成されて、半導体チップ2とダイパッド3とが接合される。
次いで、図2(d)に示すように、金属ワイヤ11の一端が半導体チップ2の配線パッドに接続され、金属ワイヤ11の他端がリード4のインナーリード41に接続される。
Next, as shown in FIG. 2C, reflow (heat treatment) is performed at 280 to 300 ° C., for example. Thereby, the Ag network 9 and the alloy layer 10 are formed on the bonding material 8, and the semiconductor chip 2 and the die pad 3 are bonded.
Next, as shown in FIG. 2D, one end of the metal wire 11 is connected to the wiring pad of the semiconductor chip 2, and the other end of the metal wire 11 is connected to the inner lead 41 of the lead 4.
続いて、リードフレーム12が成形金型にセットされ、半導体チップ2、ダイパッド3、インナーリード41、金属ワイヤ11および吊りリードの一部が、樹脂パッケージ5によって封止される。
その後、リードフレーム12の不要部分(たとえば、吊りリードにおける樹脂パッケージ5から露出する部分など)が切断される。こうして、図1に示す構造の半導体装置1の個片が得られる。
Subsequently, the lead frame 12 is set in a molding die, and the semiconductor chip 2, the die pad 3, the inner lead 41, the metal wire 11 and a part of the suspension lead are sealed with the resin package 5.
Thereafter, unnecessary portions of the lead frame 12 (for example, portions exposed from the resin package 5 in the suspension leads) are cut. In this way, individual pieces of the semiconductor device 1 having the structure shown in FIG. 1 are obtained.
上記の方法によれば、半導体チップ2の他方面22およびダイパッド3の一方面31の両方にAgめっき層(チップめっき層6およびパッドめっき層7)が形成された後、半導体チップ2とダイパッド3との間にBiSnからなる接合材8が挟まれ、その後、リフローされる。上記の工程が実行されることによって、各めっき層6,7から他方のめっき層6,7に達するAgネットワーク9を接合材8に形成することができる。このAgネットワーク9によって、半導体チップ2とダイパッド3との間の熱伝導性をさらに向上させることができる。 According to the above method, after the Ag plating layer (chip plating layer 6 and pad plating layer 7) is formed on both the other surface 22 of the semiconductor chip 2 and the one surface 31 of the die pad 3, the semiconductor chip 2 and the die pad 3 are formed. The bonding material 8 made of BiSn is sandwiched between the two and then reflowed. By performing the above steps, an Ag network 9 reaching the other plating layers 6 and 7 from each plating layer 6 and 7 can be formed in the bonding material 8. By this Ag network 9, the thermal conductivity between the semiconductor chip 2 and the die pad 3 can be further improved.
そして、得られる半導体装置1によれば、接合材8がBiSn系材料からなるので、接合材8の鉛フリー化を達成することができる。
さらに、半導体チップ2とダイパッド3との間がAgネットワーク9によって接続されるため、これらの間を熱が伝達可能となる。そのため、半導体チップ2で発生する熱を、Agネットワーク9を介して、理想的にはAgの熱伝導率(約425W/m・K)でダイパッド3に逃がすことができる。したがって、半導体チップ2の放熱性を十分に確保することができる。
And according to the obtained semiconductor device 1, since the bonding material 8 is made of a BiSn-based material, the lead-free bonding material 8 can be achieved.
Furthermore, since the semiconductor chip 2 and the die pad 3 are connected by the Ag network 9, heat can be transferred between them. Therefore, the heat generated in the semiconductor chip 2 can be released to the die pad 3 through the Ag network 9 ideally with the thermal conductivity of Ag (about 425 W / m · K). Therefore, sufficient heat dissipation of the semiconductor chip 2 can be ensured.
また、半導体チップ2の他方面22およびダイパッド3の一方面31の両方にAgからなるめっき層(チップめっき層6およびパッドめっき層7)が形成され、各めっき層6,7のAgによって蜘蛛の巣状のAgネットワーク9が形成される。そのため、いずれか一方の接合面(他方面22もしくは一方面31)にのみめっき層が形成される場合よりも、Agネットワーク9の密度を大きくすることができる。その結果、半導体チップ2の放熱性を向上させることができる。 Further, a plating layer made of Ag (chip plating layer 6 and pad plating layer 7) is formed on both the other surface 22 of the semiconductor chip 2 and one surface 31 of the die pad 3, and the plating layers 6 and 7 make Ag A nest-like Ag network 9 is formed. Therefore, the density of the Ag network 9 can be increased as compared with the case where the plating layer is formed only on one of the joining surfaces (the other surface 22 or the one surface 31). As a result, the heat dissipation of the semiconductor chip 2 can be improved.
また、チップめっき層6およびパッドめっき層7との界面近傍に、Sn−Ag合金からなる合金層10が形成される。チップめっき層6およびパッドめっき層7に対するSn−Ag合金の濡れ性は、BiSnの濡れ性よりも優れる。そのため、この合金層10によって、接合材8と、半導体チップ2およびダイパッド3との接合強度を向上させることができる。 Further, an alloy layer 10 made of an Sn—Ag alloy is formed in the vicinity of the interface between the chip plating layer 6 and the pad plating layer 7. The wettability of the Sn—Ag alloy with respect to the chip plating layer 6 and the pad plating layer 7 is superior to the wettability of BiSn. Therefore, the bonding strength between the bonding material 8 and the semiconductor chip 2 and the die pad 3 can be improved by the alloy layer 10.
また、SnはAgと合金化し易い金属であるが、接合材8におけるSnの含有量が0wt%を超過し、4wt%以下であれば、Agネットワーク9の形成に寄与するAgの不要な合金化を抑制することができる。その結果、各めっき層6,7のAgを有効活用できるので、Agネットワーク9を効率よく形成することができる。
また、Bi(融点:約270℃)がSn(融点:約232℃)よりも多量に含有されるため、接合材8に比較的高い融点(たとえば、260〜270℃)を保持させることができる。そのため、半導体装置1を実装するときのリフロー時において、優れた耐リフロー性を発揮することができる。
Sn is a metal that is easily alloyed with Ag, but if the Sn content in the bonding material 8 exceeds 0 wt% and is 4 wt% or less, unnecessary alloying of Ag that contributes to the formation of the Ag network 9 is achieved. Can be suppressed. As a result, the Ag of each of the plating layers 6 and 7 can be effectively utilized, so that the Ag network 9 can be formed efficiently.
In addition, since Bi (melting point: about 270 ° C.) is contained in a larger amount than Sn (melting point: about 232 ° C.), the bonding material 8 can have a relatively high melting point (for example, 260 to 270 ° C.). . Therefore, excellent reflow resistance can be exhibited during reflow when the semiconductor device 1 is mounted.
以上、本発明の実施形態について説明したが、本発明は他の形態で実施することもできる。
たとえば、QFPが適用された半導体装置1を取り上げたが、本発明は、たとえば、図3に示すようなQFNが適用された半導体装置51(図3において、52および53は、たとえば、錫(Sn)、錫−銀合金(Sn−Ag)などの金属からなるめっき層)、その他には、BGA、SOPなどといった他の種類のパッケージが適用された半導体装置に適用することもできる。
As mentioned above, although embodiment of this invention was described, this invention can also be implemented with another form.
For example, the semiconductor device 1 to which QFP is applied has been taken up. However, the present invention, for example, includes a semiconductor device 51 to which QFN as shown in FIG. 3 is applied (in FIG. 3, 52 and 53 are, for example, tin (Sn ), A plating layer made of a metal such as a tin-silver alloy (Sn—Ag)), and in addition, it can also be applied to a semiconductor device to which other types of packages such as BGA and SOP are applied.
その他、特許請求の範囲に記載された事項の範囲で種々の設計変更を施すことが可能である。 In addition, various design changes can be made within the scope of matters described in the claims.
次に、本発明を実施例および比較例に基づいて説明するが、この発明は下記の実施例によって限定されるものではない。
実施例1〜4および比較例1〜3
上述した製造方法に基づき、図1に示した構造の半導体装置を作製した。ただし、各実施例および比較例における接合材の組成は、以下の通りに設計した。なお、下記の組成において、Snの直前に記載される数字は、接合材におけるSnの含有量(wt%)を表わしている。
(接合材の組成)
実施例1:Bi−1Sn 実施例2:Bi−2Sn 実施例3:Bi−3Sn
実施例4:Bi−4Sn 比較例1:Bi−5Sn 比較例2:Bi−6Sn
比較例3:Bi−10Sn
評価試験
(1)SEM画像の撮影
実施例1〜4および比較例1〜3で得られた半導体装置の接合材に対して、走査型電子顕微鏡(SEM)を用いて電子ビームを照射し、それによって作り出される像を撮影した。撮影された写真を図4〜図10に示す。
Next, although this invention is demonstrated based on an Example and a comparative example, this invention is not limited by the following Example.
Examples 1-4 and Comparative Examples 1-3
Based on the manufacturing method described above, the semiconductor device having the structure shown in FIG. 1 was manufactured. However, the composition of the bonding material in each example and comparative example was designed as follows. In the following composition, the number described immediately before Sn represents the Sn content (wt%) in the bonding material.
(Composition of bonding material)
Example 1: Bi-1Sn Example 2: Bi-2Sn Example 3: Bi-3Sn
Example 4: Bi-4Sn Comparative Example 1: Bi-5Sn Comparative Example 2: Bi-6Sn
Comparative Example 3: Bi-10Sn
Evaluation Test (1) SEM Image Shooting The semiconductor device bonding materials obtained in Examples 1 to 4 and Comparative Examples 1 to 3 were irradiated with an electron beam using a scanning electron microscope (SEM). Photographed the image produced by. Photographs taken are shown in FIGS.
図4〜図10によると、Snの含有量が1〜4wt%(実施例1〜4)の接合材には、半導体チップとダイパッドとを接続するAgネットワークが形成されていることが確認できた。それに対し、Snの含有量が4wt%を超える(比較例1〜3)接合材には、Agネットワークが形成されず、SnがBi中に分散していることが確認された。
(2)融点の測定
実施例1〜4および比較例1〜3で得られた半導体装置の接合材に対して、示差走査型熱量計(セイコーインスツルメンツ社製 DSC6200)を用いて融点測定した。なお、測定条件は、昇温速度:5℃/分、温度範囲:115〜300℃とした。これにより、各接合材について、以下のことが確認された。
4 to 10, it was confirmed that an Ag network for connecting the semiconductor chip and the die pad was formed in the bonding material having the Sn content of 1 to 4 wt% (Examples 1 to 4). . On the other hand, it was confirmed that no Sn network was formed in the bonding material in which the Sn content exceeded 4 wt% (Comparative Examples 1 to 3), and Sn was dispersed in Bi.
(2) Melting | fusing point measurement With respect to the bonding | jointing material of the semiconductor device obtained in Examples 1-4 and Comparative Examples 1-3, melting | fusing point measurement was performed using the differential scanning calorimeter (Seiko Instruments company make DSC6200). The measurement conditions were a temperature increase rate of 5 ° C./min and a temperature range of 115 to 300 ° C. Thereby, the following was confirmed about each joining material.
実施例1(Bi−1Sn):接合材の全てが263℃で溶融する。
実施例2(Bi−2Sn):接合材の全てが264.1℃で溶融する。
実施例3(Bi−3Sn):接合材の全体積中13.2%が139℃で溶融する。
実施例4(Bi−4Sn):接合材の全体積中48.0%が139℃で溶融する。
比較例1(Bi−5Sn):接合材の全体積中81.7%が139℃で溶融する。
Example 1 (Bi-1Sn): All of the bonding material melts at 263 ° C.
Example 2 (Bi-2Sn): All of the bonding material melts at 264.1 ° C.
Example 3 (Bi-3Sn): 13.2% of the total volume of the bonding material melts at 139 ° C.
Example 4 (Bi-4Sn): 48.0% of the total volume of the bonding material melts at 139 ° C.
Comparative Example 1 (Bi-5Sn): 81.7% of the total volume of the bonding material melts at 139 ° C.
比較例2(Bi−6Sn):接合材の全体積中93.2%が139℃で溶融する。
比較例3(Bi−10Sn):接合材の全てが139℃で溶融する。
実施例5および比較例4〜5
JEDEC標準基板(114.3×76.2×1.6mm3)上に、表1に示す組成の接合材を用いてトランジスタを搭載した半導体装置を実装した。ただし、JEDEC標準基板は、74.2mm角の銅箔を3層重ねることによって、全体として4層構造とした。また、各銅箔間は、サーマルビアで接続されている。
評価試験
(1)許容損失の測定
実施例5および比較例4〜5の半導体装置について、桑野電機社製TH−156を用いて許容損失を測定した。結果を表1に示す。
Comparative Example 2 (Bi-6Sn): 93.2% of the total volume of the bonding material melts at 139 ° C.
Comparative Example 3 (Bi-10Sn): All of the bonding material melts at 139 ° C.
Example 5 and Comparative Examples 4-5
A semiconductor device having a transistor mounted thereon was mounted on a JEDEC standard substrate (114.3 × 76.2 × 1.6 mm 3) using a bonding material having the composition shown in Table 1. However, the JEDEC standard substrate has a four-layer structure as a whole by stacking three layers of 74.2 mm square copper foil. Moreover, between each copper foil, it connects with the thermal via.
Evaluation Test (1) Measurement of Allowable Loss For the semiconductor devices of Example 5 and Comparative Examples 4 to 5, the allowable loss was measured using TH-156 manufactured by Kuwano Electric Co., Ltd. The results are shown in Table 1.
表1によると、接合材にBi−2Snを用いた実施例5の許容損失は、Pb含有接合材を用いた比較例4に及ばないものの、理想的ではないが、Agペーストを用いた比較例5よりも高いことが確認された。これにより、実施例5が十分な放熱性を確保していることが確認された。 According to Table 1, the allowable loss of Example 5 using Bi-2Sn as the bonding material is not ideal, but it is not ideal, but the comparative example using Ag paste was compared with Comparative Example 4 using the Pb-containing bonding material. It was confirmed that it was higher than 5. Thereby, it was confirmed that Example 5 ensured sufficient heat dissipation.
1 半導体装置
2 半導体チップ
3 ダイパッド
6 チップめっき層
7 パッドめっき層
8 接合材
9 Agネットワーク
10 合金層
12 リードフレーム
22 他方面
31 一方面
DESCRIPTION OF SYMBOLS 1 Semiconductor device 2 Semiconductor chip 3 Die pad 6 Chip plating layer 7 Pad plating layer 8 Bonding material 9 Ag network 10 Alloy layer 12 Lead frame 22 Other side 31 One side
Claims (13)
前記半導体チップが接合される固体板と、
前記半導体チップと前記固体板との間に介在され、BiSn系材料からなる接合材とを含み、
前記接合材は、前記半導体チップと前記固体板との間の熱伝導性を向上させるためのAgからなる熱伝導経路を有しており、
前記熱伝導経路は、前記半導体チップにおける前記固体板との対向面に対して垂直方向に延びており、かつ前記半導体チップから前記固体板に達するように形成されており、
前記接合材におけるSnの含有量が、0wt%を超過し、1wt%以下であり、
前記接合材の融点が、260〜263℃である、半導体装置。 A semiconductor chip;
A solid plate to which the semiconductor chip is bonded;
Including a bonding material interposed between the semiconductor chip and the solid plate and made of a BiSn-based material;
The bonding material has a heat conduction path made of Ag for improving the heat conductivity between the semiconductor chip and the solid plate,
The heat conduction path extends in a direction perpendicular to the surface of the semiconductor chip facing the solid plate, and is formed so as to reach the solid plate from the semiconductor chip ,
The content of Sn in the bonding material is more than 0 wt% and not more than 1 wt%,
The semiconductor device whose melting | fusing point of the said joining material is 260-263 degreeC .
前記ダイパッド上には、1.0〜10.0μmの厚さを有するパッドめっき層が形成されている、請求項1〜10のいずれか一項に記載の半導体装置。 The solid plate is a die pad for die-bonding the semiconductor chip;
On the die pad, the pad plating layer having a thickness of 1.0~10.0μm is formed, the semiconductor device according to any one of claims 1-10.
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