JP2005175260A - Semiconductor device and manufacturing method thereof - Google Patents
Semiconductor device and manufacturing method thereof Download PDFInfo
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- JP2005175260A JP2005175260A JP2003414649A JP2003414649A JP2005175260A JP 2005175260 A JP2005175260 A JP 2005175260A JP 2003414649 A JP2003414649 A JP 2003414649A JP 2003414649 A JP2003414649 A JP 2003414649A JP 2005175260 A JP2005175260 A JP 2005175260A
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Abstract
Description
本発明は、半導体装置とその製造方法に関し、特に同一サイズの半導体装置を積層して形成するスタックLSIに関する。 The present invention relates to a semiconductor device and a method for manufacturing the same, and more particularly to a stack LSI in which semiconductor devices of the same size are stacked.
半導体チップの実装効率を上げるため、複数の半導体チップを積層して一つのLSIパッケージを構成するスタックLSI技術が普及している。通常、積層された各半導体チップと基板とはワイヤボンディング法によって接続される。ワイヤボン−ディングは通常半導体チップにファーストボンディングされるため、面積の大きい半導体チップ一番下に配置し順にピラミッド状に積層する方式が行われている。 In order to increase the mounting efficiency of a semiconductor chip, a stacked LSI technique in which a plurality of semiconductor chips are stacked to form a single LSI package has become widespread. Usually, each laminated semiconductor chip and the substrate are connected by a wire bonding method. Since wire bonding is usually first-bonded to a semiconductor chip, a method of placing the semiconductor chip at the bottom of a large-sized semiconductor chip and sequentially stacking it in a pyramid shape is used.
一方、同一サイズの半導体チップを積層する場合は、例えば図2に示されたような構成が知られている。まず、第1の半導体チップ120が導体バンプ150を介してフリップチップ接続でインタポーザ基板110に対して接続される。第1の半導体チップ120とインタポーザ基板110の間には接着剤170が形成されている。次に第1の半導体チップ120の上面に、第2の半導体チップ130を接着剤171で接着し、金ワイヤー160によるボールボンディング接続にてインタポーザ基板110と接続する。2枚の半導体チップは周囲を樹脂180で封止される。しかし、この技術で積層できる半導体チップは2枚までである。第3の半導体チップを積層する場合は第1、第2の半導体チップより小さいサイズの半導体チップを用いる必要がある。同一サイズの半導体チップを積層するならば、スペーサを介在させてその上に積層する必要がある。また、図2の構成では、フリップチップ接続が使用できるのは一番下段の半導体チップのみである。
On the other hand, when stacking semiconductor chips of the same size, for example, a configuration as shown in FIG. 2 is known. First, the
さらに別の技術としては、同一サイズの2つの半導体チップであって互いに折り返し対照の位置に電気接続パッドを備えたチップを積層する技術が知られている。これら2つの半導体チップは該電気接続パッドとその間に配置される導体バンプを介して互いに対向して接続する。この半導体装置では、ボンディングワイヤは上記電気接続パッド上に配置された導体バンプにセカンドボンディングされ、基板に対してファーストボンディングされる。電力や信号が基板側からボンディングワイヤを介して両半導体チップに供給される(例えば、特許文献1参照)。 As yet another technique, a technique is known in which two semiconductor chips of the same size and stacked with chips each having an electrical connection pad at a position to be compared with each other are known. These two semiconductor chips are connected to face each other through the electrical connection pads and conductor bumps disposed therebetween. In this semiconductor device, the bonding wires are second-bonded to the conductor bumps disposed on the electrical connection pads and first bonded to the substrate. Electric power and signals are supplied to both semiconductor chips from the substrate side via bonding wires (see, for example, Patent Document 1).
しかし、図2に記載の半導体装置では、同一サイズの半導体チップは2つしか積層できない。同一サイズのチップをさらに積層する場合はスペーサをチップ上に配置しなければならない。さらに、上側の半導体チップ上面にボンディングワイヤをファーストボンディングする構成なので、樹脂モールド後の半導体装置の厚みを薄くすることが困難である。 However, in the semiconductor device shown in FIG. 2, only two semiconductor chips of the same size can be stacked. When further stacking chips of the same size, spacers must be arranged on the chips. Furthermore, since the bonding wire is first bonded to the upper surface of the upper semiconductor chip, it is difficult to reduce the thickness of the semiconductor device after resin molding.
また、上記特許文献1記載の半導体装置では、原理的には同一サイズの半導体チップを3以上積層することが可能である。しかし、対向して接続される半導体チップは折り返し対照の配置で電気接続パッドを形成するため、同一構造の半導体チップを順次フリップチップ接続して積層することができない。 Further, in the semiconductor device described in Patent Document 1, it is possible in principle to stack three or more semiconductor chips of the same size. However, since the semiconductor chips connected to face each other form an electrical connection pad in a folded-back arrangement, semiconductor chips having the same structure cannot be sequentially stacked by flip-chip connection.
本発明は上記課題を解決するため、同一サイズで、同一の電極パッドの配置構造を有する複数の半導体チップを容易にフリップチップ接続により積層でき、かつ樹脂モールド後の厚みを薄くすることができる半導体装置とその製造方法を提供することを目的とする。 In order to solve the above problems, the present invention provides a semiconductor in which a plurality of semiconductor chips having the same size and the same electrode pad arrangement structure can be easily stacked by flip chip connection, and the thickness after resin molding can be reduced. An object is to provide an apparatus and a method for manufacturing the same.
本発明の半導体装置は、複数の半導体チップを基板上に積層して構成し、下面に導電体バンプを備え上面に導体部を備えた半導体チップをフリップチップ接続によって積層した構成を備え、前記導体部と基板部とを接続し該導体上に直接セカンドボンディングされたボンディングワイヤを備える。上記導体部は半導体チップに形成された回路部から独立して形成されることができる。導体部は前記半導体チップ上に絶縁層を介して形成することができる。上記半導体チップは、導体部から所定の距離だけ離れた領域に回路部を有することが望ましい。全体の厚みを薄くするため、最上部の半導体チップの導体部と基板部の間にはボンディングワイヤを配置しないことが望ましい。上記基板と半導体チップとの間、および各半導体チップ間には樹脂層を配置することが望ましい。また導体部は所定の電気回路を構成することができる。また上記半導体チップは同一サイズであることが可能である。 The semiconductor device of the present invention comprises a plurality of semiconductor chips stacked on a substrate, and a structure in which a semiconductor chip having a conductor bump on the lower surface and a conductor on the upper surface is stacked by flip chip connection, and the conductor A bonding wire that connects the board and the board and is second-bonded directly on the conductor. The conductor part can be formed independently of the circuit part formed on the semiconductor chip. The conductor portion can be formed on the semiconductor chip via an insulating layer. The semiconductor chip preferably has a circuit portion in a region separated from the conductor portion by a predetermined distance. In order to reduce the overall thickness, it is desirable not to arrange a bonding wire between the conductor portion of the uppermost semiconductor chip and the substrate portion. It is desirable to dispose a resin layer between the substrate and the semiconductor chip and between the semiconductor chips. The conductor portion can constitute a predetermined electric circuit. The semiconductor chips can be the same size.
本発明の半導体装置の製造方法は、所定の半導体チップの上面に導体部を形成し下面に導電体バンプを形成する工程と、基板上の導体部に半導体チップをフリップチップ接続する工程と、基板の導体部にファーストボンディングし半導体チップ上面の導体部にセカンドボンディングしてボンディングワイヤを形成する工程と、ワイヤボンディングされた半導体チップ上面に半導体チップをフリップチップ接続する工程とを備える。また、基板上の半導体チップ配置領域に接着樹脂層を形成する工程、および半導体チップ上に接着樹脂層を形成する工程、半導体ウェハ上に複数の半導体チップを形成しさらに各半導体チップ上に絶縁層と導体層を形成する工程、および上記基板上に積層された複数の半導体チップを樹脂モールドする工程を備えることができる。 A method of manufacturing a semiconductor device of the present invention includes a step of forming a conductor portion on an upper surface of a predetermined semiconductor chip and forming a conductor bump on the lower surface, a step of flip-chip connecting the semiconductor chip to the conductor portion on the substrate, Forming a bonding wire by first bonding to the conductor portion and second bonding to the conductor portion on the upper surface of the semiconductor chip, and flip-chip connecting the semiconductor chip to the upper surface of the wire-bonded semiconductor chip. Also, a step of forming an adhesive resin layer in a semiconductor chip arrangement region on the substrate, a step of forming an adhesive resin layer on the semiconductor chip, a plurality of semiconductor chips on the semiconductor wafer, and an insulating layer on each semiconductor chip And a step of forming a conductor layer and a step of resin molding a plurality of semiconductor chips stacked on the substrate.
本発明の半導体装置とその製造方法では、同一サイズで、同一の電極パッド配置構造を有する複数の半導体チップを容易にフリップチップ接続により積層でき、かつ樹脂モールド後の厚みを薄くすることができる。 In the semiconductor device of the present invention and the manufacturing method thereof, a plurality of semiconductor chips having the same size and the same electrode pad arrangement structure can be easily stacked by flip chip connection, and the thickness after resin molding can be reduced.
図1は、本発明の半導体装置の具体例を示す断面図である。インタポーザ基板10上に、第1の半導体チップ20と第2の半導体チップ30の2枚の半導体チップが積層されている。インタポーザ基板10下面の各電極パッドには、マザーボードとの接続に用いるハンダバンプ60が形成されている。第1の半導体チップ20は、その下面に電極パッドを備え、該電極パッド上に金バンプ21を備える。この金バンプ21により、第1の半導体チップ20はインタポーザ基板10上へフリップチップ接続される。第1の半導体チップ20が配置されるインタポーザ基板10の領域には、予め接着フィルム22が形成されている。該接着フィルム22は半導体チップ20を固定し、また半導体チップ20と基板10との隙間を埋める。第1の半導体チップ20の上面側には、まずポリイミド層(絶縁層)23が形成され、この上に銅の導電層24が積層されている。銅の導電層24は第1の半導体チップ20に形成される回路とは独立に配置されている。これら2つの層23、24は配線層25を構成する。この配線層25は、第2の半導体チップ30の金バンプ31によるフリップチップ接続と、ボンディングワイヤ26によるボンディングを共に考慮した所定のパターンに形成される。配線層25の電極パッド部とインタポーザ基板10の電極部との間が金のボンディングワイヤ26でボールボンディングされている。金のボンディングワイヤ26は、インタポーザ基板10にファーストボンディングされ、配線層25の電極パッドに直接セカンドボンディングされている。上記配線層には簡単な抵抗やコイルを形成することも可能である。
FIG. 1 is a cross-sectional view showing a specific example of the semiconductor device of the present invention. Two semiconductor chips, a
半導体チップに形成される回路部は、上記セカンドボンディングの与える影響を少なくするため、このボンディングされる電極パッド部の直下には形成されず、また該電極パッド部から所定の距離だけ離れた領域に形成される。第1の半導体チップ20上面の電極上には狭い間隔で第2の半導体チップ30がフリップチップ接続される。なお第1の半導体チップ20と第2の半導体チップ30との間には接着フィルム32が配置される。ワイヤ26が配線層25に直接セカンドボンディングされているので、次に積層される第2の半導体チップとの間隙を小さくすることができる。この構成において、第2の半導体チップは、第1の半導体チップとは独立にインタポーザ基板10と接続しうる。第2の半導体チップは第1の半導体チップと同一サイズ、同一構造を有する。従って第2の半導体チップ30の上面には上記と同様の配線層25が形成されている。しかし、最上部の半導体チップ(図1の例では第2の半導体チップ)とインタポーザ基板10との間にはボンディングワイヤが形成されない。図1には示されないが、さらに半導体チップを積層する場合、上述と同様の構造が繰り返される。積層される半導体チップは後述するように半導体ウェハから複数形成された同一サイズ、同一構造を有する場合が現実的である。しかし、異なる機能を有する半導体チップ同士の積層も可能であり、また積層に支障を生じなければ半導体チップの金バンプ形成位置、セカンドボンディング位置、または配線層25の構成が半導体チップ間で相違していてもよい。
In order to reduce the influence of the second bonding, the circuit portion formed on the semiconductor chip is not formed immediately below the electrode pad portion to be bonded, and in a region separated from the electrode pad portion by a predetermined distance. It is formed. The
次に上記半導体装置の製造方法について説明する。公知の半導体製造技術によって、半導体ウェハに複数の半導体チップに対応する電気回路を形成する。このウェハを各半導体チップごとに切断する前に、ウェハのままでポリイミド層23を形成し、この上の配線層不要部分にレジストをパターニングする。次に所定形状の銅パターンをメッキ形成する。レジストを除去して銅パターンを形成する。表面絶縁層としてポリイミドをパターニング塗布する。またウェハ下面に電極パッドを形成する。この後、各半導体チップに切断する。切断された各チップの下面に金バンプを形成する。次に、予め用意したインタポーザ基板10上で上記半導体チップが設置される領域に接着フィルム22を形成する。接着フィルム22は例えばスクリーン印刷によって形成することができ、あるいは所定形状のフィルムを貼り付けることができる。この接着フィルム22上に第1の半導体チップ20をフリップチップ接続する。
Next, a method for manufacturing the semiconductor device will be described. Electric circuits corresponding to a plurality of semiconductor chips are formed on a semiconductor wafer by a known semiconductor manufacturing technique. Before the wafer is cut for each semiconductor chip, the
次に第1の半導体チップ20の上面には接着フィルム32を上記方法によって形成する。その後のボンディングワイヤ26を配置する工程では、まず金ワイヤをインタポーザ基板の所定の電極パッドにファーストボンディングし、続けて半導体チップ20上面の銅パターンの所定位置にセカンドボンディングする。次に上記ワイヤがセカンドボンディングされた第1の半導体チップ20の電極パッド上に第2の半導体チップをフリップチップボンディングする。第2の半導体チップの金バンプはセカンドボンディングされたワイヤ上に接続される場合と、セカンドボンディングされる銅パターン上に接続される場合がある。さらに3以上の半導体チップを積層するときは、同様の工程を繰り返す。所望の数の半導体チップの積層とワイヤの形成が完了したのち、インタポーザ基板10を樹脂50で封止する。
Next, the
10 インタポーザ基板
20 第1の半導体チップ
22、32 接着フィルム
26 ボンディングワイヤ
30 第2の半導体チップ
DESCRIPTION OF
Claims (14)
所定の半導体チップの上面に導体部を形成し下面に導電体バンプを形成する工程と、
基板上の導体部に前記半導体チップをフリップチップ接続する工程と、
前記基板の導体部にファーストボンディングし前記半導体チップ上面の導体部にセカンドボンディングしてボンディングワイヤを形成する工程と、
前記ワイヤボンディングされた半導体チップ上面に前記半導体チップをフリップチップ接続する工程と、
を備えることを特徴とする半導体装置の製造方法。 A method for manufacturing a semiconductor device, comprising:
Forming a conductor portion on the upper surface of a predetermined semiconductor chip and forming a conductor bump on the lower surface;
Flip chip connecting the semiconductor chip to a conductor on a substrate;
Forming a bonding wire by first bonding to the conductor portion of the substrate and second bonding to the conductor portion of the upper surface of the semiconductor chip;
Flip chip connecting the semiconductor chip to the upper surface of the wire bonded semiconductor chip;
A method for manufacturing a semiconductor device, comprising:
The semiconductor manufacturing method according to claim 11, further comprising resin-molding a plurality of semiconductor chips stacked on the substrate.
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WO2011129272A1 (en) * | 2010-04-13 | 2011-10-20 | 積水化学工業株式会社 | Attachment material for semiconductor chip bonding, attachment film for semiconductor chip bonding, semiconductor device manufacturing method, and semiconductor device |
US8384200B2 (en) | 2006-02-20 | 2013-02-26 | Micron Technology, Inc. | Semiconductor device assemblies including face-to-face semiconductor dice and systems including such assemblies |
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US8384200B2 (en) | 2006-02-20 | 2013-02-26 | Micron Technology, Inc. | Semiconductor device assemblies including face-to-face semiconductor dice and systems including such assemblies |
US8927332B2 (en) | 2006-02-20 | 2015-01-06 | Micron Technology, Inc. | Methods of manufacturing semiconductor device assemblies including face-to-face semiconductor dice |
US9269695B2 (en) | 2006-02-20 | 2016-02-23 | Micron Technology, Inc. | Semiconductor device assemblies including face-to-face semiconductor dice and related methods |
WO2011129272A1 (en) * | 2010-04-13 | 2011-10-20 | 積水化学工業株式会社 | Attachment material for semiconductor chip bonding, attachment film for semiconductor chip bonding, semiconductor device manufacturing method, and semiconductor device |
JP4922474B2 (en) * | 2010-04-13 | 2012-04-25 | 積水化学工業株式会社 | Semiconductor device |
CN102834907A (en) * | 2010-04-13 | 2012-12-19 | 积水化学工业株式会社 | Attachment material for semiconductor chip bonding, attachment film for semiconductor chip bonding, semiconductor device manufacturing method, and semiconductor device |
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