JP3510039B2 - 半導体装置およびその製造方法 - Google Patents
半導体装置およびその製造方法Info
- Publication number
- JP3510039B2 JP3510039B2 JP05878396A JP5878396A JP3510039B2 JP 3510039 B2 JP3510039 B2 JP 3510039B2 JP 05878396 A JP05878396 A JP 05878396A JP 5878396 A JP5878396 A JP 5878396A JP 3510039 B2 JP3510039 B2 JP 3510039B2
- Authority
- JP
- Japan
- Prior art keywords
- insulating film
- interlayer insulating
- electrode
- bonding
- alloy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000004065 semiconductor Substances 0.000 title claims description 16
- 238000004519 manufacturing process Methods 0.000 title claims description 3
- 239000011229 interlayer Substances 0.000 claims description 39
- 239000000758 substrate Substances 0.000 claims description 23
- 239000000956 alloy Substances 0.000 claims description 15
- 229910045601 alloy Inorganic materials 0.000 claims description 14
- 239000010410 layer Substances 0.000 claims description 13
- 229910052710 silicon Inorganic materials 0.000 claims description 13
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 12
- 239000010703 silicon Substances 0.000 claims description 12
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 229910000676 Si alloy Inorganic materials 0.000 claims description 2
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 claims 1
- 239000010408 film Substances 0.000 description 42
- 239000010419 fine particle Substances 0.000 description 24
- 230000007547 defect Effects 0.000 description 9
- 239000011856 silicon-based particle Substances 0.000 description 8
- 229910021364 Al-Si alloy Inorganic materials 0.000 description 7
- 229910018125 Al-Si Inorganic materials 0.000 description 6
- 229910018520 Al—Si Inorganic materials 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000002950 deficient Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 238000004506 ultrasonic cleaning Methods 0.000 description 2
- 229910018523 Al—S Inorganic materials 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- GDFCWFBWQUEQIJ-UHFFFAOYSA-N [B].[P] Chemical compound [B].[P] GDFCWFBWQUEQIJ-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000001259 photo etching Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000001039 wet etching Methods 0.000 description 1
Classifications
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- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/11—Device type
- H01L2924/13—Discrete devices, e.g. 3 terminal devices
- H01L2924/1304—Transistor
- H01L2924/1306—Field-effect transistor [FET]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/11—Device type
- H01L2924/13—Discrete devices, e.g. 3 terminal devices
- H01L2924/1304—Transistor
- H01L2924/1306—Field-effect transistor [FET]
- H01L2924/13091—Metal-Oxide-Semiconductor Field-Effect Transistor [MOSFET]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/11—Device type
- H01L2924/14—Integrated circuits
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
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- H01L2924/1901—Structure
- H01L2924/1904—Component type
- H01L2924/19041—Component type being a capacitor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/19—Details of hybrid assemblies other than the semiconductor or other solid state devices to be connected
- H01L2924/1901—Structure
- H01L2924/1904—Component type
- H01L2924/19043—Component type being a resistor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/20—Parameters
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- Manufacturing & Machinery (AREA)
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Description
成された層間絶縁膜上にシリコン微粒子(以下Si微粒
子と称す)を含む金属材料よりなる電極を有する半導体
装置およびその製造方法に関するものである。
Cチップという)は、半導体基板1に抵抗・トランジス
タ・コンデンサ等の素子が形成され、それら素子上に
は、これら素子を保護するとともに、素子間の絶縁性を
保持するために、層間絶縁膜3が形成されている。さら
に、この層間絶縁膜3上には、上記ICチップと外部回
路とを電気的に接続するための金属材料としてアルミニ
ウム(以下Alと称す)等の薄膜から成る電極5が形成
されている。しかし、この電極に不純物を含まないAl
(以下純Alという)を用いた場合には、図4に示した
ように、Si半導体基板を構成するSi基板1と電極5
中に含有されるAlが直接接触するコンタクト部7にS
iがAl中に溶解することで生じたアロイスパイク9と
よばれるAlの突き抜けが発生する。このアロイスパイ
ク9がSi基板1に発生するとPN接合を破壊し素子の
特性に大きな影響を与える。
らかじめSiを1〜2wt%程度含ませた合金(以下A
l- Si合金という)を使用することで、この現象を防
いでいた。
電極5には過剰のSiが含有されているため、図5に示
すようにAl結晶粒界などにSi微粒子10が必ず析出
して問題が生じる。この問題を図6を用いて説明する。
即ち、半導体基板にAlワイヤ12を超音波接合させよ
うとする場合において、この電極5上にワイヤボンディ
ングを施すこととなる。
がトランジスタセル14上で行われた場合には、層間絶
縁膜3上に析出したSi微粒子10が、ボンディングの
際の振動のエネルギーAを受け、層間絶縁膜3にクラッ
ク16を生じさせる。そして、このクラック16がトラ
ンジスタセル14を破壊し、その結果リークを生じ、I
Cチップを不良とさせてしまうという問題が生じるので
ある。
されたものであり、その目的とするところは、アロイス
パイクの発生を抑制すると同時に層間絶縁膜上に析出し
たSi微粒子によるボンディング時の不良をなくした半
導体装置を提供することである。
の原因に対して鋭意研究した結果、以下のような新規な
知見を見いだした。即ち、従来においては、Si微粒子
10が析出した層間絶縁膜3上にワイヤボンディングな
どを行っても必ずしもICチップ不良とはならない。
ところ、我々発明者らはボンディング用電極における層
間絶縁膜のクラック発生メカニズムが以下のようなもの
であることを見いだしたのである。この研究成果とし
て、図7に示すようにSi微粒子10の析出位置が層間
絶縁膜3上にあり、そのSi微粒子10と層間絶縁膜3
との接触界面に反応接合層18を生じている場合におい
てワイヤボンディング時に不良となることを見出し、以
下のように新規なボンディング電極を提供するに至った
のである。
ワイヤとによって挟まれた部分の電極の成分として、主
成分がアルミニウムであって、さらにシリコン微粒子が
0.1〜0.6wt%含有されている電極とすることに
よって、ワイヤ接合時において、ボンディング用電極に
大きな超音波パワーや大きな荷重等を作用させたとき、
下地の層間絶縁膜に直接パワーを伝えることがなく、ク
ラックなどのダメージが生じ難くすることができる。即
ち、本発明のボンディング用電極が形成されたICチッ
プなどのデバイスにおいては、ボンディング不良が低減
され、かつアロイスパイクの発生を抑えた信頼性の高い
ものとすることができる。
子が0.1〜0.6wt%よりなるターゲットを用い
て、前記層間絶縁膜上に電極を形成することにより、ボ
ンディング不良が低減され、かつアロイスパイクの発生
を抑えた信頼性の高い半導体装置を得ることができる。
基づいて説明する。図1は本発明に係る半導体装置を構
成するボンディング用電極におけるSi微粒子の発生状
態を示した断面模式図である。図1において、半導体基
板であるSi基板1には、その内部或いは上部に公知の
パワーMOSやIGBT等によって形成された、図に示
されないトランジスタ・抵抗・コンデンサなどの素子が
形成されている。また、上記Si基板1上には、CVD
法などにより層間絶縁膜3が形成されている。この層間
絶縁膜3は、例えば、BPSG(Boron-Phosphorus S
ilicate Glass)膜やPSG(Phosphorus Silicate
Glass)膜などから成る。そして、この上にスパッタリ
ング法によりボンディング用電極となるAl−Si合金
材料から成るAl−Si膜である電極5を堆積する。
ワー7.2kw、ガス圧6mTorr、基板加熱温度1
50℃にて、0.5wt%のSiを含有するAl−Si
合金から成るターゲットを用いた。又、基板加熱は半導
体基板をチャックするステージのヒーターにより加熱さ
れたArガスを基板裏面に吹き付けることにより行い、
温度はヒーターに通電する電流量により制御した。
り所定のパターンにパターニングする。この後、450
℃で30分のシンタリングを施す。このシンタリングに
より、コンタクト7ではSi基板1と電極5とが電気的
に良好に接続されるのである。得られた半導体装置は、
アルミニウムを主成分とし、平均粒径1μmのSi微粒
子が0.5wt%含有された電極を有している。本実施
例においては、電極として、Si微粒子の低い含有量と
することによって、不良がなく良好なボンディング構造
を有した半導体素子とすることができた。
微粒子量としては、0.1〜0.6wt%が良い。その
理由を以下詳述する。ここで、図2において、ボンディ
ング用電極における層間絶縁膜上のSi微粒子と層間絶
縁膜との間に形成された反応接合層の数とAl−Si合
金ターゲット中のSi含有量の関係を示す。
絶縁膜の間に形成された反応接合層の数は、ボンディン
グ用電極を塩酸等によりウェットエッチングし、更に、
超音波洗浄によってSi微粒子を完全除去した後、SE
M等によりその表面を観察し、Si微粒子により生じた
くぼみの数(個/2000μm2 )によって確認した。
これは、ボンディングにより不良を生じたサンプルの
Si微粒子と層間絶縁膜の界面を実験分析により詳細に
観察したところ、図7に示す反応接合層18ができてい
ることが観察さるので、層間絶縁膜上のSi微粒子と層
間絶縁膜の間に反応接合層が生じていれば超音波洗浄に
よるSi微粒子の除去がされたとき、反応接合層ととも
に除去されるために層間絶縁膜上にくぼみが生じること
となり、結合の数を数えることが可能となることを利用
したものである。
Si含有量を0.6wt%以下とすることによって、層
間絶縁膜上のSi微粒子と層間絶縁膜の間に形成された
反応接合層の数が低減することがわかる。図3はボンデ
ィング用電極に対してAlワイヤ径400μm ×6本、
荷重500〜600gf、超音波パワー90〜110でワ
イヤボンディングを実施した場合の不良率とAl−Si
合金ターゲット中のSi含有量の関係を示した特性図で
ある。
Si含有量を0.6wt%以下とすることによって、不
良率を大幅に低減させることができることがわかる。即
ち、図2と図3を照らし合わせると、層間絶縁膜上のS
i微粒子と層間絶縁膜の結合界面の反応接合層を低減す
れば、不良率が低減することは明白であり、反応接合層
の低減も、Al−Si合金ターゲット中のSi含有量を
0.6wt%以下とすることによって、達成することが
できることがわかる。
i合金を電極に用いた時の、アロイスパイクの深さを測
定したところその深さは0.2〜0.5μmであり、パ
ワー素子などのデバイスで用いる場合、特に問題の生じ
ない深さであることが確認された。ここで、Al−Si
合金ターゲット中のSi含有量とこのターゲットから得
られる電極の成分とはほぼ相関関係があり、例えば、S
iが0.5wt%含有されたAl−Si合金ターゲット
を用いた場合には、それから得られた電極もSiがほぼ
0.5wt%含有された電極とすることができることが
確認されている。
は、Al−Si合金中のSi含有量を0.1〜0.6w
t%の間の極微量で正確に調整されたターゲットを用い
ることにより成膜される。そのため、成膜時に発生する
Si微粒子は非常に小さく、膜中に均一に分散されてい
る。 さらに、その後の熱処理においてSi微粒子は、
固溶限界まで膜中に溶解する。そして冷却過程で再析出
する際、Si含有量を0.1〜0.6wt%と極微量に
抑えてあるため、層間絶縁膜上の成長核は非常に少なく
なっており、層間絶縁膜上でのSi微粒子の成長は抑制
される。そして、Si微粒子の成長が抑制されているこ
とにより、Si微粒子と層間絶縁膜の間に発生する応力
が小さいため接触界面の反応接合層は形成されないこと
となる。
発生しても、Si微粒子と層間絶縁膜の接合界面に反応
接合層が形成されないため、ワイヤボンディングなどに
おいて層間絶縁膜のクラック発生を極めて少なくでき
る。また、電極中にSiが最低でも0.1wt%含まれ
ているため、Si基板から溶出するSiを抑えることが
可能となり、アロイスパイクの発生も抑制できる。
用いることにより、ボンディングにおける品質を極めて
安定したものとすることができると同時にデバイスの信
頼性も安定したものとすることができる。尚、上述の実
施例においては、Al−Si膜上にワイヤボンディング
する際について述べたが、この他、バンプ等にAl−S
i膜上から超音波・荷重が作用し、下地にクラックなど
のダメージが生じる場合にも本発明を適用してダメージ
を緩和することができる。
として平均粒径1μmのものを採用したが、Si微粒子
が0.1〜3.5μmであっても、本願発明の作用・効
果を有することができる。
す関係図。
図。
Claims (2)
- 【請求項1】 パワー素子デバイスが形成されたシリコ
ン基板と、該シリコン基板上に設けられた層間絶縁膜
と、該層間絶縁膜上に形成され、前記シリコン基板とコ
ンタクト部にて電気的に接続する電極と、該電極上に接
合されたワイヤとからなる半導体装置であって、 前記電極の成分は、主成分がアルミニウムでシリコンが
含有されたものであって、前記層間絶縁膜上のシリコン
微粒子と層間絶縁膜との間の反応接合層を低減させるべ
くシリコンの含有量が0.1〜0.6wt%とされてお
り、 前記パワー素子デバイスは、0.2〜0.5μmの深さ
のアロイスパイクで前記コンタクト部のPN接合が破壊
されないことを特徴とする半導体装置。 - 【請求項2】 シリコン基板に0.2〜0.5μmの深
さのアロイスパイクでコンタクト部のPN接合が破壊さ
れないパワー素子デバイスを形成し、 該シリコン基板上に層間絶縁膜を形成し、 シリコン含有量が0.1〜0.6wt%の間で調整され
たアルミニウム−シリコン合金ターゲットを用いて、前
記コンタクト部にて前記シリコン基板に電気的に接続す
る電極を前記層間絶縁膜上に形成し、 前記層間絶縁膜上に、前記電極を介してワイヤを超音波
振動によって接合することを特徴とする半導体装置の製
造方法。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP05878396A JP3510039B2 (ja) | 1996-03-15 | 1996-03-15 | 半導体装置およびその製造方法 |
DE19709764A DE19709764B4 (de) | 1996-03-15 | 1997-03-10 | Halbleitervorrichtung mit Elektrode aus Aluminium und feinkörnigem Silizium und ihr Herstellungsverfahren |
US08/818,729 US5801445A (en) | 1996-03-15 | 1997-03-14 | Semiconductor device and method of manufacturing same |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP05878396A JP3510039B2 (ja) | 1996-03-15 | 1996-03-15 | 半導体装置およびその製造方法 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH09252019A JPH09252019A (ja) | 1997-09-22 |
JP3510039B2 true JP3510039B2 (ja) | 2004-03-22 |
Family
ID=13094178
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP05878396A Expired - Fee Related JP3510039B2 (ja) | 1996-03-15 | 1996-03-15 | 半導体装置およびその製造方法 |
Country Status (3)
Country | Link |
---|---|
US (1) | US5801445A (ja) |
JP (1) | JP3510039B2 (ja) |
DE (1) | DE19709764B4 (ja) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000106401A (ja) * | 1998-09-29 | 2000-04-11 | Sony Corp | メモリ素子およびその製造方法ならびに集積回路 |
US6693350B2 (en) | 1999-11-24 | 2004-02-17 | Denso Corporation | Semiconductor device having radiation structure and method for manufacturing semiconductor device having radiation structure |
US6703707B1 (en) * | 1999-11-24 | 2004-03-09 | Denso Corporation | Semiconductor device having radiation structure |
JP4479121B2 (ja) * | 2001-04-25 | 2010-06-09 | 株式会社デンソー | 半導体装置の製造方法 |
US6650010B2 (en) * | 2002-02-15 | 2003-11-18 | International Business Machines Corporation | Unique feature design enabling structural integrity for advanced low K semiconductor chips |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4546374A (en) * | 1981-03-23 | 1985-10-08 | Motorola Inc. | Semiconductor device including plateless package |
US4558345A (en) * | 1983-10-27 | 1985-12-10 | Rca Corporation | Multiple connection bond pad for an integrated circuit device and method of making same |
JPS6095947A (ja) * | 1983-10-31 | 1985-05-29 | Tanaka Denshi Kogyo Kk | 半導体素子のボンデイング用Al線 |
JPS63283040A (ja) * | 1987-05-15 | 1988-11-18 | Toshiba Corp | 半導体装置 |
US5260604A (en) * | 1988-09-27 | 1993-11-09 | Mitsubishi Denki Kabushiki Kaisha | Semiconductor device with improved immunity to contact and conductor defects |
US5229646A (en) * | 1989-01-13 | 1993-07-20 | Mitsubishi Denki Kabushiki Kaisha | Semiconductor device with a copper wires ball bonded to aluminum electrodes |
JPH06132508A (ja) * | 1992-10-20 | 1994-05-13 | Sony Corp | 固体撮像素子とその製造方法 |
JP3371504B2 (ja) * | 1993-01-25 | 2003-01-27 | 株式会社デンソー | 合金電極にワイヤボンディングされた半導体装置及び合金電極の製造方法 |
JPH0845874A (ja) * | 1994-07-30 | 1996-02-16 | Mitsumi Electric Co Ltd | 半導体装置 |
-
1996
- 1996-03-15 JP JP05878396A patent/JP3510039B2/ja not_active Expired - Fee Related
-
1997
- 1997-03-10 DE DE19709764A patent/DE19709764B4/de not_active Expired - Fee Related
- 1997-03-14 US US08/818,729 patent/US5801445A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE19709764A1 (de) | 1997-11-06 |
JPH09252019A (ja) | 1997-09-22 |
US5801445A (en) | 1998-09-01 |
DE19709764B4 (de) | 2007-08-30 |
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