JPWO2006109506A1 - Semiconductor device manufacturing method and semiconductor device - Google Patents

Semiconductor device manufacturing method and semiconductor device Download PDF

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JPWO2006109506A1
JPWO2006109506A1 JP2007512479A JP2007512479A JPWO2006109506A1 JP WO2006109506 A1 JPWO2006109506 A1 JP WO2006109506A1 JP 2007512479 A JP2007512479 A JP 2007512479A JP 2007512479 A JP2007512479 A JP 2007512479A JP WO2006109506 A1 JPWO2006109506 A1 JP WO2006109506A1
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semiconductor element
adhesive layer
semiconductor
semiconductor device
substrate
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JP4976284B2 (en
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稔 森田
稔 森田
幸二 中村
幸二 中村
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Nippon Steel Chemical and Materials Co Ltd
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Abstract

工程が簡略でかつ低コストのスペーサーレススタックドパッケージタイプの半導体装置の製造方法及び半導体装置に関する。この半導体装置は、基板上にワイヤボンディング方式により金線で基板と接続されたフェイスアップ状態の第１の半導体素子上に第２の半導体素子を積層した構造を有する。この半導体装置は、シリカ含有量が５０〜８０質量％であるエポキシ樹脂組成物を、粘度が１〜６０Pa・sの範囲にある半溶融状態で、１０〜３００μmの厚み範囲で第１の半導体素子と第２の半導体素子の間に介在させて接着層となし、第１の半導体素子と第２の半導体素子とを結合させるとともに、第１の半導体素子に接続される金線の一部を被覆し、その後、接着層を加熱により硬化させることにより製造される。The present invention relates to a manufacturing method and a semiconductor device of a spacerless stacked package type semiconductor device having a simple process and a low cost. This semiconductor device has a structure in which a second semiconductor element is stacked on a first semiconductor element in a face-up state, which is connected to the substrate with a gold wire by a wire bonding method. In this semiconductor device, an epoxy resin composition having a silica content of 50 to 80% by mass is a first semiconductor element in a thickness range of 10 to 300 μm in a semi-molten state having a viscosity of 1 to 60 Pa · s. Between the first semiconductor element and the second semiconductor element to form an adhesive layer, which bonds the first semiconductor element and the second semiconductor element and covers a part of the gold wire connected to the first semiconductor element Then, the adhesive layer is manufactured by curing by heating.

Description

本発明は、複数個の半導体素子を積層させ搭載することにより実装密度を高めたパッケージ構造を有する半導体装置（以下、これをスタックドパッケージと呼ぶことがある。）の製造方法及び半導体装置に関するものである。   The present invention relates to a method of manufacturing a semiconductor device having a package structure in which a mounting density is increased by stacking and mounting a plurality of semiconductor elements (hereinafter sometimes referred to as a stacked package) and a semiconductor device. It is.

近年、単一パッケージ内に複数個の半導体素子を搭載することにより、半導体装置の小型化、高性能化が図られている。例えば、信号の高速処理機能を持った素子をメモリ機能を持つ素子と組み合わせることで携帯電子機器等に搭載されるメモリへ付加価値を付与したり、あるいはメモリ容量を増大させたりすることを狙って、複数個の半導体素子を積層して搭載するスタックドパッケージ等がある。   In recent years, by mounting a plurality of semiconductor elements in a single package, semiconductor devices have been reduced in size and performance. For example, aiming to add value to a memory mounted on a portable electronic device or to increase a memory capacity by combining an element having a high-speed signal processing function with an element having a memory function. There is a stacked package in which a plurality of semiconductor elements are stacked and mounted.

半導体装置は半導体素子と基板とを何らかの手法で電気的に接続する必要がある。現在では、ワイヤボンディング方式により、ワイヤで両者を接続することが主流となっている。
この場合、上側に積層される半導体素子（第２の半導体素子という）が既に基板上に搭載されている半導体素子（第１の半導体素子という）よりも小さいときには、第１の半導体素子のワイヤ部分が積層により損なわれることはないが、同程度又はそれ以上に大きいときには、このワイヤ部分が積層により損なわれる問題がある。A semiconductor device needs to electrically connect a semiconductor element and a substrate by some method. At present, it is the mainstream to connect both with a wire by a wire bonding method.
In this case, when the semiconductor element stacked on the upper side (referred to as the second semiconductor element) is smaller than the semiconductor element already mounted on the substrate (referred to as the first semiconductor element), the wire portion of the first semiconductor element Is not damaged by the lamination, but when it is the same or larger, there is a problem that this wire portion is damaged by the lamination.

この問題を解決するために、半導体素子の積層に関わる構造及びその製造方法として様々なものが提案され、実現されている。
例えば、スペーサー構造を採用した半導体装置がある。第２の半導体素子と第１の半導体素子の間に厚みの大きなスペーサーを挟むことで、第２の半導体素子と第１の半導体素子の間に一定の間隔が確保され、第２の半導体素子の形状及び大きさに関わらず、第１の半導体素子のワイヤ部分が損なわれることなく第２の半導体素子を積層することができる。しかし、その間隔を確保するために、十分な厚みを有するスペーサーを用いる必要があり、パッケージの薄型化には不向きであった。In order to solve this problem, various structures and manufacturing methods related to the stacking of semiconductor elements have been proposed and realized.
For example, there is a semiconductor device that employs a spacer structure. By sandwiching a spacer having a large thickness between the second semiconductor element and the first semiconductor element, a certain distance is secured between the second semiconductor element and the first semiconductor element. Regardless of the shape and size, the second semiconductor element can be stacked without damaging the wire portion of the first semiconductor element. However, it is necessary to use a spacer having a sufficient thickness in order to ensure the interval, which is not suitable for reducing the thickness of the package.

このパッケージの薄型化という問題に対して、スペーサーレスのスタックドパッケージが実現されている。特許文献１に示される半導体装置は、第１の半導体素子の素子形成面の縁部がベベルカットによりテーパ状に形成されている。この半導体装置はスペーサーを使用せず、上側半導体素子の接着層が下側半導体素子の配線面上のセンターパッド及びワイヤの一部を被覆し固定化した構造を有しており、スペーサー構造に比べ薄型化が実現されている。   A spacerless stacked package has been realized with respect to the problem of thinning the package. In the semiconductor device disclosed in Patent Document 1, the edge portion of the element formation surface of the first semiconductor element is tapered by bevel cutting. This semiconductor device does not use a spacer, and has a structure in which the adhesive layer of the upper semiconductor element covers and fixes a part of the center pad and wire on the wiring surface of the lower semiconductor element. Thinning is realized.

また、上側半導体素子の樹脂層を多層化することで、半導体素子とワイヤの接触を回避する工夫がなされた例がある。例えば、上側半導体素子と下側半導体素子間に介挿される樹脂層が接着層と絶縁層の２層からなる半導体装置がある（特許文献２参照。）。絶縁層として15〜30μｍの厚みのポリイミドが用いられる。この２層構造の樹脂層により、上側半導体素子と下側半導体素子のワイヤ部分との接触を回避している。
同様な例として、樹脂層が３層からなる半導体装置もあり、中間層に一定の硬度を持ったポリイミドを介挿させ、保護材として機能させている（特許文献３参照。）。
上記のいずれの例においても、従来のスタックドパッケージの製造工程が簡略化され、低コスト化が実現されている。
特開２００４−２８２０５６号公報 特開２００２−２２２９１３号公報 特開２００４−７２００９号公報 In addition, there is an example in which the resin layer of the upper semiconductor element is multilayered so as to avoid contact between the semiconductor element and the wire. For example, there is a semiconductor device in which a resin layer interposed between an upper semiconductor element and a lower semiconductor element is composed of two layers of an adhesive layer and an insulating layer (see Patent Document 2). As the insulating layer, polyimide having a thickness of 15 to 30 μm is used. This two-layer resin layer avoids contact between the upper semiconductor element and the wire portion of the lower semiconductor element.
As a similar example, there is a semiconductor device having three resin layers, and a polyimide having a certain hardness is inserted in an intermediate layer to function as a protective material (see Patent Document 3).
In any of the above examples, the manufacturing process of the conventional stacked package is simplified, and cost reduction is realized.
JP 2004-282056 A JP 2002-222913 A Japanese Patent Laid-Open No. 2004-72009

しかしながら、上記ベベルカット手法により半導体素子端部をテーパ状に形成する場合は、通常の工程に加え、１）ベベルカット手法により第１の半導体素子端部を研削する工程、及び２）接着層の一部を除去する工程が増加し、コストアップが問題となる。また、半導体素子を研削することは、半導体装置の機能低下を招くことに繋がる。
他方、ポリイミドのような硬度の大きなフィルム（絶縁層）を第２の半導体素子と第１の半導体素子の間に介挿させる場合においても、フィルムを接着層と貼り合せ、多層化する工程が必要となり、また、フィルムと接着層を空隙なく貼り合せる技術が求められる。フィルムと接着層の間に発生する空隙は、信頼性試験の吸湿リフロー時に界面剥離、クラック等を生じる原因となる。However, in the case where the semiconductor element end is formed in a tapered shape by the bevel cut technique, in addition to the normal process, 1) the step of grinding the first semiconductor element end by the bevel cut technique, and 2) the adhesive layer The process of removing a part increases and the cost increases. Further, grinding the semiconductor element leads to a decrease in the function of the semiconductor device.
On the other hand, even when a hard film (insulating layer) such as polyimide is interposed between the second semiconductor element and the first semiconductor element, a step of laminating the film with the adhesive layer is required. Moreover, the technique which bonds a film and an adhesive layer without a space | gap is calculated | required. The voids generated between the film and the adhesive layer cause interfacial peeling, cracks, etc. during moisture absorption reflow in the reliability test.

本発明は、上記の課題に鑑みてなされたものであり、工程が簡略でかつ低コストのスペーサーレススタックドパッケージタイプの半導体装置の製造方法及び半導体装置を提供することを目的とする。   The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a spacerless stacked package type semiconductor device manufacturing method and a semiconductor device with simple processes and low costs.

本発明に係る半導体装置の製造方法は、ワイヤボンディング方式により基板と接続されたフェイスアップ状態の第１の半導体素子上に、第２の半導体素子を積層し、基板上に少なくとも２つの積層された半導体素子を構成部品として有する半導体装置の製造方法において、該第１の半導体素子上に該第２の半導体素子を積層するに際し、シリカ、エポキシ樹脂を必須成分とし、シリカ含有量が５０〜８０質量％であるエポキシ樹脂組成物を、粘度が１〜６０Pa・sの範囲にある半溶融状態で、１０〜３００μｍの厚み範囲で該第１の半導体素子と該第２の半導体素子の間に介在させて接着層となし、該接着層により、該第１の半導体素子と該第２の半導体素子とを結合させるとともに、該第１の半導体素子に接続されるワイヤの一部を被覆し、その後、該接着層を加熱により硬化させることを特徴とする。   In the method for manufacturing a semiconductor device according to the present invention, a second semiconductor element is stacked on a first semiconductor element in a face-up state connected to a substrate by a wire bonding method, and at least two layers are stacked on the substrate. In the method of manufacturing a semiconductor device having a semiconductor element as a component, when the second semiconductor element is stacked on the first semiconductor element, silica and epoxy resin are essential components, and the silica content is 50 to 80 mass. % Epoxy resin composition is interposed between the first semiconductor element and the second semiconductor element in a thickness range of 10 to 300 μm in a semi-molten state having a viscosity in the range of 1 to 60 Pa · s. Forming an adhesive layer, and bonding the first semiconductor element and the second semiconductor element with the adhesive layer and covering a part of the wire connected to the first semiconductor element; After, wherein the curing by heating the adhesive layer.

ここで、第１の半導体素子が絶縁被覆されたワイヤにより基板と接続されることが好ましい。また、第２の半導体素子の幅が第１の半導体素子の幅の９０〜３００％であることが好ましい。   Here, it is preferable that the first semiconductor element is connected to the substrate by a wire coated with insulation. The width of the second semiconductor element is preferably 90 to 300% of the width of the first semiconductor element.

この半導体装置の製造方法において、基板と第1の半導体素子を接着層により仮圧着し、ついで該接着層を熱により硬化させることが好ましい。また、基板及び第１の半導体素子、ならびに前記第１の半導体素子及び前記第２の半導体素子を、それぞれ実質的に同一組成の接着層により結合させることが好ましい。   In this method of manufacturing a semiconductor device, it is preferable that the substrate and the first semiconductor element are temporarily pressure-bonded with an adhesive layer, and then the adhesive layer is cured by heat. Further, it is preferable that the substrate, the first semiconductor element, and the first semiconductor element and the second semiconductor element are bonded together by an adhesive layer having substantially the same composition.

また、本発明に係る半導体装置は、ワイヤボンディング方式により基板と接続されたフェイスアップ状態の第１の半導体素子上に、第２の半導体素子を積層し、基板上に少なくとも２つ以上の積層された半導体素子を構成部品として有する半導体装置において、該第１の半導体素子と該第２の半導体素子の間に、シリカ、エポキシ樹脂を必須成分とし、シリカ含有量が５０〜８０質量％であるエポキシ樹脂組成物が硬化された接着層を１０〜３００μｍの厚み範囲で形成してなることを特徴とする。   The semiconductor device according to the present invention includes a second semiconductor element stacked on a first semiconductor element in a face-up state connected to a substrate by a wire bonding method, and at least two or more stacked on the substrate. In the semiconductor device having a semiconductor element as a component, an epoxy having silica and an epoxy resin as essential components between the first semiconductor element and the second semiconductor element and having a silica content of 50 to 80% by mass The adhesive layer in which the resin composition is cured is formed in a thickness range of 10 to 300 μm.

前記特許文献１に記載の半導体装置は、図２に示すように接着層1aを介してインターポーザー2に搭載された第１の半導体素子3aの素子形成面の縁部がベベルカットによりテーパ状aに形成されている。この構成により、第１の半導体素子3aのセンターパッド4からインターポーザー2上に延在するボンディングワイヤ5が第１の半導体素子3aの縁部により損傷を受けるおそれを低減することができるとされている。また、この半導体装置は、第２の半導体素子3bと第１の半導体素子3aの間に設けられる接着層1bが第１の半導体素子3aよりも小さく形成され、これにより、第１の半導体素子3aと第２の半導体素子3bとの間に隙間ができるため、ボンディングワイヤ5と第２の半導体素子3bとの干渉を防ぐことができるとされている。   In the semiconductor device described in Patent Document 1, the edge of the element forming surface of the first semiconductor element 3a mounted on the interposer 2 via the adhesive layer 1a is tapered by bevel cutting as shown in FIG. Is formed. With this configuration, it is possible to reduce the possibility that the bonding wire 5 extending from the center pad 4 of the first semiconductor element 3a onto the interposer 2 is damaged by the edge of the first semiconductor element 3a. Yes. Further, in this semiconductor device, an adhesive layer 1b provided between the second semiconductor element 3b and the first semiconductor element 3a is formed smaller than the first semiconductor element 3a, whereby the first semiconductor element 3a is formed. Since a gap is formed between the second semiconductor element 3b and the second semiconductor element 3b, interference between the bonding wire 5 and the second semiconductor element 3b can be prevented.

本発明の半導体装置の一例を、その断面図を示す図１により説明する。
半導体装置10は、基板（配線基板）12上に接着層14を介して搭載され、ワイヤボンディング方式によりワイヤ16で基板12と接続されたフェイスアップ状態の第１の半導体素子18上に、接着層20を介して第２の半導体素子22を積層した構造を有する。ここで、接着層20は、シリカ、エポキシ樹脂を必須成分とし、シリカ含有量が５０〜８０質量％であるエポキシ樹脂組成物からなる。このエポキシ樹脂組成物は熱硬化されることによって、硬化された接着層となる。この接着層の厚みは、１０〜３００μｍの範囲である。An example of the semiconductor device of the present invention will be described with reference to FIG.
The semiconductor device 10 is mounted on a substrate (wiring substrate) 12 via an adhesive layer 14, and on the first semiconductor element 18 in a face-up state connected to the substrate 12 with a wire 16 by a wire bonding method. The second semiconductor element 22 is stacked via 20. Here, the adhesive layer 20 is made of an epoxy resin composition having silica and an epoxy resin as essential components and a silica content of 50 to 80% by mass. This epoxy resin composition becomes a cured adhesive layer by being thermally cured. The thickness of the adhesive layer is in the range of 10 to 300 μm.

本発明に係る半導体装置は、第１の半導体素子と第２の半導体素子の間に比較的厚い熱硬化性の接着層を介在させることで、第１の半導体素子と第２の半導体素子間に、第１の半導体素子に接続されるワイヤが第２の半導体素子の裏面に接触しない程の十分な距離を設けることができる。第１の半導体素子と第２の半導体素子の間に設けられる接着層は1層からなり、従来技術のように硬度の高い絶縁層を設ける必要がなくなり、工程の簡略化が実現される。   In the semiconductor device according to the present invention, a relatively thick thermosetting adhesive layer is interposed between the first semiconductor element and the second semiconductor element, so that the first semiconductor element and the second semiconductor element are interposed. A sufficient distance can be provided such that the wire connected to the first semiconductor element does not contact the back surface of the second semiconductor element. The adhesive layer provided between the first semiconductor element and the second semiconductor element is composed of one layer, and it is not necessary to provide an insulating layer with high hardness as in the prior art, thereby simplifying the process.

本発明の半導体装置の製造方法の一例を図３、４及び５を参照して説明する。
本発明の半導体装置の製造方法によれば、ワイヤボンディング方式により基板12と電気的に接続されたフェイスアップ状態の第１の半導体素子18上に、第２の半導体素子22を積層し、基板上に少なくとも２つの積層された半導体素子を構成部品として有する半導体装置が得られる。An example of a method for manufacturing a semiconductor device of the present invention will be described with reference to FIGS.
According to the method for manufacturing a semiconductor device of the present invention, the second semiconductor element 22 is laminated on the first semiconductor element 18 in the face-up state, which is electrically connected to the substrate 12 by the wire bonding method. Thus, a semiconductor device having at least two stacked semiconductor elements as component parts is obtained.

ここで、ワイヤボンディングに用いるワイヤ16は、特に限定するものではないが、好適には、金線である。また、半導体素子を搭載する基板12は、特に限定するものではなく、積層基板であってもよく、また、単一層からなる基板であってもよい。また、半導体素子18、22は、特に限定するものではなく、ダイオード、トランジスタ、ＩＣ等である。   Here, the wire 16 used for wire bonding is not particularly limited, but is preferably a gold wire. In addition, the substrate 12 on which the semiconductor element is mounted is not particularly limited, and may be a laminated substrate or a single layer substrate. The semiconductor elements 18 and 22 are not particularly limited, and are diodes, transistors, ICs, and the like.

第１の半導体素子上に積層される半導体素子は、第２の半導体素子だけに限らず、更に第２の半導体素子の上に第３の半導体素子を積層してもよく、更に第４以降の半導体素子を積層してもよい。これらの半導体素子は、第１の半導体素子の場合と同様にワイヤボンディングにより基板と電気的に接続される構造のものとすることができるが、これに限定するものではない。   The semiconductor element stacked on the first semiconductor element is not limited to the second semiconductor element, and a third semiconductor element may be further stacked on the second semiconductor element. Semiconductor elements may be stacked. These semiconductor elements can be structured to be electrically connected to the substrate by wire bonding as in the case of the first semiconductor element, but are not limited thereto.

第１の半導体素子上に第２の半導体素子を積層するに際し、第１の半導体素子と第２の半導体素子の間に介在する接着層20を設ける。この接着層20は、シリカ、エポキシ樹脂を必須成分とし、シリカ含有量が５０〜８０質量％であるエポキシ樹脂組成物を、粘度が１〜６０Pa・sの範囲にある半溶融状態で、１０〜３００μｍの厚み範囲で第１の半導体素子に接着等して形成する。このエポキシ樹脂組成物は、５０℃以上、好ましくは６０〜１２０℃で溶融又は半溶融し、上記粘度を示すことがよい。そして、１２０℃以上、好ましくは１５０〜２００℃で０．５〜３hr加熱することで硬化することがよい。   When the second semiconductor element is stacked on the first semiconductor element, an adhesive layer 20 is provided to be interposed between the first semiconductor element and the second semiconductor element. This adhesive layer 20 contains silica and an epoxy resin as essential components, and an epoxy resin composition having a silica content of 50 to 80% by mass in a semi-molten state having a viscosity in the range of 1 to 60 Pa · s. It is formed by bonding or the like to the first semiconductor element within a thickness range of 300 μm. The epoxy resin composition should melt or semi-melt at 50 ° C. or higher, preferably 60 to 120 ° C., and exhibit the above viscosity. And it is good to harden by heating at 120 degreeC or more, Preferably it is 150-200 degreeC for 0.5 to 3 hours.

ここで、接着層20は、搭載後の半導体素子の平坦性を示す BLT (Bond line Thickness) の安定を確保するため、フィルム状エポキシ樹脂組成物からなるフィルム状接着剤が好ましい。なお、フィルム状接着剤は、エポキシ樹脂成分の他に、硬化剤を含有することが好ましく、このような熱硬化性のフィルム状接着剤は、硬化後に安定した寸法安定性と耐熱性を有する。具体的には、硬化後の接着層20の線膨張係数は１０〜５０ppm/K、ガラス転移温度は、１５０〜１７０℃、弾性率は７０００〜１７０００ＭＰａの範囲にあることが好ましい。接着層20の厚みは、１０〜３００μｍの範囲であるが、５０〜２００μｍの範囲が好ましい。   Here, the adhesive layer 20 is preferably a film adhesive made of a film epoxy resin composition in order to ensure the stability of BLT (Bond line Thickness) indicating the flatness of the semiconductor element after mounting. In addition, it is preferable that a film adhesive contains a hardening | curing agent other than an epoxy resin component, and such a thermosetting film adhesive has the stable dimensional stability and heat resistance after hardening. Specifically, the adhesive layer 20 after curing preferably has a linear expansion coefficient of 10 to 50 ppm / K, a glass transition temperature of 150 to 170 ° C., and an elastic modulus of 7000 to 17000 MPa. The thickness of the adhesive layer 20 is in the range of 10 to 300 μm, but is preferably in the range of 50 to 200 μm.

このとき、接着層20を、第１の半導体素子に接続されるワイヤ16の一部、言い換えれば第１の半導体素子上に配置されるワイヤの部分を被覆するように設ける。そして、接着層を加熱により硬化させる。更に、ワイヤボンディングによって第２の半導体素子を基板と電気的に接続する。第２の半導体素子上に更に半導体素子を積層する場合は、以下、同様の工程が繰り返される。   At this time, the adhesive layer 20 is provided so as to cover a part of the wire 16 connected to the first semiconductor element, in other words, a part of the wire arranged on the first semiconductor element. Then, the adhesive layer is cured by heating. Further, the second semiconductor element is electrically connected to the substrate by wire bonding. In the case where a semiconductor element is further stacked on the second semiconductor element, the same process is repeated thereafter.

この接着層20は、シリカ高充填でありながら、溶融粘度が低いため、高温の半溶融状態で第１の半導体素子に接着することでワイヤに負荷がかかることなくワイヤの一部を被覆することができる。このように容易に半導体装置の絶縁性を確保できるため、複数個の半導体素子からなるスタックドパッケージの製造も容易となる。   Since this adhesive layer 20 is highly filled with silica and has a low melt viscosity, it adheres to the first semiconductor element in a semi-molten state at a high temperature to cover a part of the wire without applying a load to the wire Can do. As described above, since the insulation of the semiconductor device can be easily secured, it is easy to manufacture a stacked package including a plurality of semiconductor elements.

本発明に係る半導体装置の製造方法において、第１の半導体素子が少なくとも一部が絶縁被覆されたワイヤにより基板と接続されることが好ましい。なお、第２の半導体素子をはじめとする第３以降の半導体素子に接続されるワイヤについて同様の構成とすることが好ましい。
ここで、絶縁被覆は、第１の半導体素子に接続されるワイヤの一部、言い換えれば第１の半導体素子上に配置されるワイヤ部分のみに設けてもよいが、第１の半導体素子と基板とを接続するワイヤ全体に設けると、より好適である。In the method of manufacturing a semiconductor device according to the present invention, it is preferable that the first semiconductor element is connected to the substrate by a wire that is at least partially covered with an insulating coating. It is preferable that the wires connected to the third and subsequent semiconductor elements including the second semiconductor element have the same configuration.
Here, the insulating coating may be provided only on a part of the wire connected to the first semiconductor element, in other words, only on the wire part arranged on the first semiconductor element. It is more preferable to provide the entire wire connecting them.

絶縁被覆材料は、例えば、ポリウレタン樹脂、ポリエステル樹脂、ポリイミド樹脂、エステルアミド樹脂、エステルイミド樹脂、エポキシ樹脂などのような絶縁性樹脂を好適に用いることができるが、これに限定するものではない。絶縁被覆の厚みは、ワイヤの条件にもよるが、例えば、５〜４０μｍ程度とする。
これにより、ワイヤと第２の半導体素子間の接触を回避することができ、第1の半導体素子と第２の半導体素子の間に介在される接着層の厚みも更に薄くでき、半導体装置の薄型化を実現することができる。As the insulating coating material, for example, an insulating resin such as a polyurethane resin, a polyester resin, a polyimide resin, an ester amide resin, an ester imide resin, or an epoxy resin can be suitably used, but the insulating coating material is not limited thereto. The thickness of the insulation coating is, for example, about 5 to 40 μm although it depends on the wire conditions.
Thereby, the contact between the wire and the second semiconductor element can be avoided, the thickness of the adhesive layer interposed between the first semiconductor element and the second semiconductor element can be further reduced, and the semiconductor device can be made thin. Can be realized.

そして、第２の半導体素子の幅が前記第１の半導体素子の幅の９０〜３００％であることが好ましい。半導体素子は、通常ある厚みを有する四辺形状であるが、この場合の幅とは縦又は横の長さをいう。ここで、縦及び横の幅のいずれか一方、好ましくは両方が上記数値を満足することがよい。これにより、配線面の大きさの自由度が拡大し、特に広範囲に確保され、半導体装置の高機能化にも繋がる。   The width of the second semiconductor element is preferably 90 to 300% of the width of the first semiconductor element. A semiconductor element usually has a quadrilateral shape having a certain thickness. In this case, the width refers to a vertical or horizontal length. Here, it is preferable that either one of the vertical and horizontal widths, preferably both satisfy the above numerical values. As a result, the degree of freedom of the size of the wiring surface is expanded, particularly in a wide range, leading to higher functionality of the semiconductor device.

半導体装置の製造方法において、基板と第1の半導体素子を接着層14により仮圧着し、ついで、別工程で接着層を熱により硬化させることが好ましい。これにより、接着層を仮圧着（ダイマウント工程）で基板に対しボイドなく搭載し、その後キュア工程を経ることで、接着層の高弾性率が達成され、積層される第１の半導体素子は強固な土台となり、第２の半導体素子を積層する際に必要な所定の荷重にも耐えることができる。   In the method for manufacturing a semiconductor device, it is preferable that the substrate and the first semiconductor element are temporarily pressure-bonded by the adhesive layer 14, and then the adhesive layer is cured by heat in a separate step. As a result, the adhesive layer is mounted on the substrate without a void by provisional pressure bonding (die mounting process), and then the curing process is performed, whereby the high elastic modulus of the adhesive layer is achieved and the first semiconductor element to be stacked is strong. And can withstand a predetermined load required when the second semiconductor element is stacked.

基板と第1の半導体素子を結合させる接着層14に使用される接着剤は、接着層2 0に使用されるエポキシ樹脂組成物からなる接着剤と実質的に同一組成であることがよい。この場合も、フィルム状とされた接着剤を使用することがよいが、厚みは接着層20に使用されるフィルム状接着剤により薄くすることがよい。好ましくはその１０〜７０％の厚みとする。エポキシ樹脂組成物からなる接着剤は、硬化前は粘着性を示すため、仮圧着が可能であるが、熱硬化後は固着する。これにより、ウエハから第１の半導体素子及び第２の半導体素子を作製する工程を簡略化できる。   The adhesive used for the adhesive layer 14 for bonding the substrate and the first semiconductor element may have substantially the same composition as the adhesive made of the epoxy resin composition used for the adhesive layer 20. In this case as well, it is preferable to use a film-like adhesive, but the thickness is preferably reduced by the film-like adhesive used for the adhesive layer 20. Preferably, the thickness is 10 to 70%. Since the adhesive made of the epoxy resin composition exhibits tackiness before curing, it can be temporarily crimped, but is fixed after thermosetting. Thereby, the process of manufacturing the first semiconductor element and the second semiconductor element from the wafer can be simplified.

本発明の半導体装置の断面図である。It is sectional drawing of the semiconductor device of this invention. 従来の半導体装置の断面図である。It is sectional drawing of the conventional semiconductor device. 本発明の半導体装置の製造方法の各工程を説明するための図である。It is a figure for demonstrating each process of the manufacturing method of the semiconductor device of this invention. 本発明の半導体装置の製造方法の各工程を説明するための図である。It is a figure for demonstrating each process of the manufacturing method of the semiconductor device of this invention. 本発明の半導体装置の製造方法の各工程を説明するための図である。It is a figure for demonstrating each process of the manufacturing method of the semiconductor device of this invention. 本発明の他の一例を示す半導体装置の断面図である。It is sectional drawing of the semiconductor device which shows another example of this invention.

符号の説明Explanation of symbols

10、10a；半導体装置： 12；基板： 14、20、20a；接着層： 16、16a；ワイヤ： 18；第１の半導体素子： 22；第２の半導体素子： 24；ワイヤボンディング電極パターン   Semiconductor device: 12; Substrate: 14, 20, 20a; Adhesion layer: 16, 16a; Wire: 18; First semiconductor element: 22; Second semiconductor element: 24; Wire bonding electrode pattern

実施例を挙げて、本発明を更に説明する。なお、本発明は、以下に説明する実施例に限定されるものではない。   The present invention will be further described with reference to examples. In addition, this invention is not limited to the Example demonstrated below.

本発明の半導体装置の製造方法により製造される半導体装置の断面図を図１に示す。
半導体装置10は、基板（配線基板）12上に接着層（熱硬化性接着層）14を介して搭載され、ワイヤボンディング方式により金線16で基板12と接続されたフェイスアップ状態の第１の半導体素子18上に、接着層（熱硬化性接着層）20を介して第２の半導体素子22を積層した構造を有する。図１中、参照符号24は、基板12等の表面に形成されるワイヤボンディング電極パターンを示す。
接着層20は、エポキシ樹脂、シリカフィラーを主成分とし、シリカフィラーが高充填された熱硬化性フィルム状接着剤である。なお、接着層14は、接着層20と同様の構成であってもよく、また、他の構成としてもよい。本実施例では、シリカフィラーを７０質量％含有するエポキシ樹脂組成物を厚さ９０μｍの熱硬化性フィルム状接着剤として使用した。なお、この熱硬化性フィルム状接着剤は、硬化後、線膨張係数が２０ppm/K、ガラス転移温度が１７０℃、弾性率が１６０００MPaであった。接着層２０の厚みは、用いたワイヤループの高さにより異なるが、ここでは、９０μｍとした。A cross-sectional view of a semiconductor device manufactured by the method for manufacturing a semiconductor device of the present invention is shown in FIG.
The semiconductor device 10 is mounted on a substrate (wiring substrate) 12 via an adhesive layer (thermosetting adhesive layer) 14 and is face-up-first connected to the substrate 12 by a gold wire 16 by a wire bonding method. It has a structure in which a second semiconductor element 22 is laminated on a semiconductor element 18 via an adhesive layer (thermosetting adhesive layer) 20. In FIG. 1, reference numeral 24 denotes a wire bonding electrode pattern formed on the surface of the substrate 12 or the like.
The adhesive layer 20 is a thermosetting film-like adhesive mainly composed of an epoxy resin and a silica filler and highly filled with the silica filler. The adhesive layer 14 may have a configuration similar to that of the adhesive layer 20, or may have another configuration. In this example, an epoxy resin composition containing 70% by mass of silica filler was used as a thermosetting film adhesive having a thickness of 90 μm. The thermosetting film adhesive had a linear expansion coefficient of 20 ppm / K, a glass transition temperature of 170 ° C., and an elastic modulus of 16000 MPa after curing. Although the thickness of the adhesive layer 20 varies depending on the height of the wire loop used, it is 90 μm here.

半導体装置10の製造方法について、図３〜図５を参照して説明する。
まず、周知の方法により、ウエハに接着層14を貼付け、これをダイシングテープ へ貼付けた後、 ダイシングし個片化により第1の半導体素子18を作製した。
裏面に接着層14を貼付けた第1の半導体素子18は、図３に示すように、基板12にダイマウントにより仮圧着し、１５０℃〜１８０℃で１時間、接着層14を硬化させた。
この際、接着層14の厚みは半導体パッケージの薄型化のために、できる限り薄くすることが望ましい。A method for manufacturing the semiconductor device 10 will be described with reference to FIGS.
First, an adhesive layer 14 was attached to a wafer by a well-known method, and this was attached to a dicing tape. Then, the first semiconductor element 18 was produced by dicing and dicing.
As shown in FIG. 3, the first semiconductor element 18 having the adhesive layer 14 attached to the back surface was temporarily pressure-bonded to the substrate 12 by a die mount, and the adhesive layer 14 was cured at 150 ° C. to 180 ° C. for 1 hour.
At this time, the thickness of the adhesive layer 14 is desirably as thin as possible in order to reduce the thickness of the semiconductor package.

ついで、図４に示すように、第１の半導体素子18の配線面上のワイヤボンディング電極パターン24bと基板12の表面のワイヤボンディング電極パターン24aをワイヤボンディングにより金線16で接続した。   Next, as shown in FIG. 4, the wire bonding electrode pattern 24b on the wiring surface of the first semiconductor element 18 and the wire bonding electrode pattern 24a on the surface of the substrate 12 were connected by a gold wire 16 by wire bonding.

ついで、図５に示すように、第1の半導体素子18と同様の方法で作製した裏面に接着層20を貼付けた第２の半導体素子22を、８０℃〜２００℃で１０秒程度熱処理し、接着層の粘度が１〜６００Pa・sの範囲にある状態で第１の半導体素子18に仮圧着し、硬化させた。高温状態で接着層20は液状化し、第1の半導体素子の配線面上の金線に負荷をかけることなく被覆することができる。仮圧着後、１５０℃〜１８０℃で１時間、接着層20を硬化させる。   Next, as shown in FIG. 5, the second semiconductor element 22 having the adhesive layer 20 pasted on the back surface produced by the same method as the first semiconductor element 18 is heat-treated at 80 ° C. to 200 ° C. for about 10 seconds, In a state where the viscosity of the adhesive layer is in the range of 1 to 600 Pa · s, the first semiconductor element 18 was temporarily pressed and cured. The adhesive layer 20 liquefies at a high temperature, and can be coated without applying a load to the gold wire on the wiring surface of the first semiconductor element. After the temporary pressure bonding, the adhesive layer 20 is cured at 150 ° C. to 180 ° C. for 1 hour.

最後に、第２の半導体素子22の表面に形成されているワイヤボンディング電極パターン24と基板12の表面のワイヤボンディング電極パターン24をワイヤボンディングにより金線16で接続することにより、図１に示した半導体装置10を得た。なお、半導体装置10は、必要に応じて、更に樹脂封止等が行われ、各半導体素子が保護される。   Finally, the wire bonding electrode pattern 24 formed on the surface of the second semiconductor element 22 and the wire bonding electrode pattern 24 on the surface of the substrate 12 are connected by the gold wire 16 by wire bonding, as shown in FIG. A semiconductor device 10 was obtained. Note that the semiconductor device 10 is further sealed with resin or the like as necessary to protect each semiconductor element.

上記の工程中、接着層14及び接着層20とされるエポキシ熱硬化性フィルム状接着剤はエポキシ樹脂、シリカフィラーを主成分とし、例えば特開2001-49220号公報に示しているように3本ロールでシリカフィラーを高分散化させ製造する。この際、シリカ含有量が５０質量%未満では、フィルムのタック性、線膨張係数の増大が問題となり好ましくない。また、８０質量%を超えるとバインダーとして働く樹脂成分が不足するため組成物の粘度上昇が観察され、脆いフィルムとなってしまう。そのため、含有するシリカフィラーは５０質量%〜８０質量%であることが望ましい。また、シリカフィラーの含有率、エポキシ配合量により溶融粘度も調整することができる。   In the above process, the epoxy thermosetting film adhesive used as the adhesive layer 14 and the adhesive layer 20 is mainly composed of an epoxy resin and a silica filler, for example, three as shown in JP-A-2001-49220. The silica filler is made highly dispersed with a roll. At this time, if the silica content is less than 50% by mass, the tackiness of the film and the increase of the linear expansion coefficient become problems, which is not preferable. On the other hand, if it exceeds 80% by mass, the resin component acting as a binder is insufficient, so that an increase in the viscosity of the composition is observed, resulting in a brittle film. Therefore, it is desirable that the silica filler contained is 50% by mass to 80% by mass. Moreover, melt viscosity can also be adjusted with the content rate of a silica filler, and an epoxy compounding quantity.

本発明に係る別の構造の半導体装置を、その断面図を示す図６により説明する。
半導体装置10aは、ワイヤボンディングに用いる金線16、16aが例えば絶縁性のポリウレタン樹脂からなる絶縁被覆層26で被覆されたものである。半導体装置10aは、半導体素子22と金線16aとの接触を懸念する必要がないため、接着層20aの厚みは、より薄くでき、例えば100μｍ以下とすることができる。A semiconductor device having another structure according to the present invention will be described with reference to FIG.
In the semiconductor device 10a, gold wires 16 and 16a used for wire bonding are covered with an insulating coating layer 26 made of, for example, an insulating polyurethane resin. Since the semiconductor device 10a does not need to worry about the contact between the semiconductor element 22 and the gold wire 16a, the thickness of the adhesive layer 20a can be made thinner, for example, 100 μm or less.

産業上の利用の可能性Industrial applicability

本発明の半導体装置の製造方法及び本発明の半導体装置は、接着層を第１の半導体素子と第２の半導体素子の間に介在させるため、第１の半導体素子に接続されるワイヤが第２の半導体素子の裏面に接触しないだけの十分な距離を設けることができる。これにより、半導体装置の製造工程が簡略化され、低コスト化を実現することができる。また、本発明の半導体装置の製造方法は、接着層を半溶融状態で第１の半導体素子上に積層するため、ワイヤに加わる負荷を軽減することができる。   In the method for manufacturing a semiconductor device of the present invention and the semiconductor device of the present invention, since the adhesive layer is interposed between the first semiconductor element and the second semiconductor element, the wire connected to the first semiconductor element is the second. It is possible to provide a sufficient distance so as not to contact the back surface of the semiconductor element. Thereby, the manufacturing process of a semiconductor device is simplified and cost reduction can be realized. Further, in the method for manufacturing a semiconductor device of the present invention, since the adhesive layer is laminated on the first semiconductor element in a semi-molten state, the load applied to the wire can be reduced.

Claims (6)

ワイヤボンディング方式により基板と接続されたフェイスアップ状態の第１の半導体素子上に、第２の半導体素子を積層し、基板上に少なくとも２つの積層された半導体素子を構成部品として有する半導体装置の製造方法において、
該第１の半導体素子上に該第２の半導体素子を積層するに際し、シリカ含有量が５０〜８０質量％であるエポキシ樹脂組成物を、粘度が１〜６０Pa・ｓの範囲にある半溶融状態で、１０〜３００μｍの厚み範囲で該第１の半導体素子と該第２の半導体素子の間に介在させて接着層となし、該接着層により、該第１の半導体素子と該第２の半導体素子とを結合させるとともに、該第１の半導体素子に接続されるワイヤの一部を被覆し、その後、該接着層を加熱により硬化させることを特徴とする半導体装置の製造方法。Manufacturing of a semiconductor device having a second semiconductor element stacked on a first semiconductor element in a face-up state connected to a substrate by a wire bonding method, and having at least two stacked semiconductor elements as a component on the substrate In the method
In laminating the second semiconductor element on the first semiconductor element, the epoxy resin composition having a silica content of 50 to 80% by mass is in a semi-molten state having a viscosity in the range of 1 to 60 Pa · s. Thus, an adhesive layer is formed between the first semiconductor element and the second semiconductor element within a thickness range of 10 to 300 μm, and the first semiconductor element and the second semiconductor are formed by the adhesive layer. A method for manufacturing a semiconductor device, comprising: bonding an element; covering a part of a wire connected to the first semiconductor element; and thereafter curing the adhesive layer by heating. 第１の半導体素子が、絶縁被覆されたワイヤにより基板と接続される請求項１記載の半導体装置の製造方法。   The method for manufacturing a semiconductor device according to claim 1, wherein the first semiconductor element is connected to the substrate by a wire coated with insulation. 第２の半導体素子の幅が、第１の半導体素子の幅の９０〜３００％である請求項１又は２に記載の半導体装置の製造方法。   The method for manufacturing a semiconductor device according to claim 1, wherein the width of the second semiconductor element is 90 to 300% of the width of the first semiconductor element. 基板と第1の半導体素子を接着層により仮圧着し、ついで該接着層を熱により硬化させることを特徴とする請求項１〜３のいずれか１項に記載の半導体装置の製造方法。   The method for manufacturing a semiconductor device according to claim 1, wherein the substrate and the first semiconductor element are temporarily pressure-bonded with an adhesive layer, and then the adhesive layer is cured by heat. 基板及び第１の半導体素子、ならびに第１の半導体素子及び第２の半導体素子を、それぞれ実質的に同一組成の接着層により結合させることを特徴とする請求項１〜４のいずれか１項に記載の半導体装置の製造方法。   5. The substrate according to claim 1, wherein the substrate, the first semiconductor element, and the first semiconductor element and the second semiconductor element are bonded together by an adhesive layer having substantially the same composition. The manufacturing method of the semiconductor device of description. ワイヤボンディング方式により基板と接続されたフェイスアップ状態の第１の半導体素子上に、第２の半導体素子を積層し、基板上に少なくとも２つ以上の積層された半導体素子を構成部品として有する半導体装置において、
該第１の半導体素子と該第２の半導体素子の間に、シリカ含有量が５０〜８０質量％であるエポキシ樹脂組成物の硬化物からなる接着層を１０〜３００μｍの厚み範囲で形成してなることを特徴とする半導体装置。A semiconductor device in which a second semiconductor element is stacked on a first semiconductor element in a face-up state connected to a substrate by a wire bonding method, and at least two or more stacked semiconductor elements are formed as components on the substrate In
An adhesive layer made of a cured product of an epoxy resin composition having a silica content of 50 to 80% by mass is formed in a thickness range of 10 to 300 μm between the first semiconductor element and the second semiconductor element. A semiconductor device comprising:
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