JPH02285638A - 半導体装置 - Google Patents

半導体装置

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Publication number
JPH02285638A
JPH02285638A JP1105912A JP10591289A JPH02285638A JP H02285638 A JPH02285638 A JP H02285638A JP 1105912 A JP1105912 A JP 1105912A JP 10591289 A JP10591289 A JP 10591289A JP H02285638 A JPH02285638 A JP H02285638A
Authority
JP
Japan
Prior art keywords
film
layer
polysilicon
bonding pad
semiconductor device
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.)
Pending
Application number
JP1105912A
Other languages
English (en)
Inventor
Seiichi Mori
誠一 森
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP1105912A priority Critical patent/JPH02285638A/ja
Priority to US07/513,973 priority patent/US5036383A/en
Priority to DE69033229T priority patent/DE69033229T2/de
Priority to EP90107998A priority patent/EP0395072B1/en
Priority to KR1019900005982A priority patent/KR930010981B1/ko
Publication of JPH02285638A publication Critical patent/JPH02285638A/ja
Pending legal-status Critical Current

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    • H01L24/04Structure, shape, material or disposition of the bonding areas prior to the connecting process
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    • H01L21/18Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
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Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。

Description

【発明の詳細な説明】 [発明の目的] (産業上の利用分野) 本発明は半導体装置に係り、特にボンディングパッドの
構造に関するものである。
(従来の技術) 一般に、半導体基板内に形成された素子の電気的特性を
外部に取り出すため、素子同士を結線している電極配線
に金属線をボンディングさせる部分をボンディングパッ
ドと称す。
以下図面を参照してボンディングパッドの構造を説明す
る。
第2図は従来のボンディングパッドの構造を示す断面図
である。
第2図に示すようにSi基板(201)上に形成された
絶縁酸化膜(フィールド酸化膜) (202)の上にボ
ンディングパッドを形成する。
ボンディングパッドは通常配線構造と同じであるためバ
リアメタル層(203)及び金属電極(204)により
構成され、そのまわりにパッシベーション膜(205)
が形成されている。このボンディングパッドにワイヤー
(20’B)をボンディングする。この場合バリアメタ
ル層(203>には例えばTi層を用い金属電極(20
4)にはA4またはAA金合金A4Si−Cu等)を用
いる。
しかしながら上記のような構造ではボンディングパッド
(203,204)とシリコン基板(201>との間に
存在する絶縁酸化膜(202)の機械的強度不足のため
ワイヤーボンディングの際この絶縁酸化膜(202)に
クラック(207)が生じ半導体装置を動作させるため
ボンディングパッドに外部より電圧を印加した際ボンデ
ィングパッド(203,204) トシ’)コン基板(
201)との間にリーク電流が生じる恐れがあった。
(発明が解決しようとする課題) 上記のような従来の半導体装置のボンディングパッド構
造ではボンディングパッドと半導体基板との間に存在す
る膜の機械的強度が低いためワイヤーボンディングの際
クラックが発生することによりリーク電流が発生し半導
体装置の信頼性が低下するという問題があった。
本発明は上述した問題を考慮してなされたものでその目
的はボンディングパッド部の電気的耐圧性を向上させ信
頼性の高い半導体装置を提供することにある。
[発明の構成] (課題を解決するための手段) 上記目的を達成するために本発明は請求項第1記載の半
導体装置においては、 半導体基板と、この半導体基板上に形成されたポリシリ
コン膜と、 このポリシリコン膜上に形成された酸化膜及び窒化膜に
より構成される複合膜と、 この複合膜上に形成されたアルミニウム及びアルミニウ
ム合金のうちどちらか一方より構成され金属電極層と、
を有する。
又、本発明は請求項第2記載の半導体装置においては、 半導体基板と、この半導体基板上に形成された酸化膜及
び窒化膜により構成される複合膜と、この複合膜上に形
成されたポリシリコン膜、高融点金属層及び高融点金属
シリサイド層のうちいずれか一つよりなる層と、 このポリシリコン膜、高融点金属層及び高融点金属シリ
サイド層のうちいずれか一つよりなる層上に形成され、
ボンディングパッドとして用いられる金属電極層と、を
有する。
(作 用) 本発明のボンディングパッドの構造では、半導体基板と
、金属電極層との間に酸化膜及び窒化膜により構成され
る電気的耐圧性の高い硬質の複合膜と、軟質のポリシリ
コン膜を設けることにより機械的強度が向上される。
(実施例) 以下図面を参照して本発明の実施例を詳細に説明する。
第1図(a)は本発明の第1の実施例によるボンディン
グパッド部の構造を示す断面図である。
第1図に示すように、本発明の第1の実施例のボンディ
ングパッド部は、例えばEFROM(Electric
ally Programmable Read 0n
ly Memory:電気的にプログラム可能な読み出
し専用メモリ)のような2層ゲート構造デバイスの場合
であり、シリコン基板(101)の上に絶縁酸化膜(フ
ィールド酸化膜) (102)が例えば5000人程度
形成されており、その上部にEPROMのフローティン
グゲート(第1層のゲート材料)に用いられるポリシリ
コン膜(103)が例えば2000人程度形成されてい
る。
さらにその上部にポリシリコン層間膜として酸化膜−窒
化膜一酸化膜(Oxide −N 1tride −O
xide)の3層絶縁膜(以下ONO絶縁膜と称す’)
 (104)があり、その上部にEFROMのコントロ
ールゲート(第2層のゲート材料)として用いられるポ
リシリコン(1052)及びM o S i膜(105
2)とからなるポリサイド膜(105)が5000人形
成されている。
このポリサイド膜(105)上にコンタクトホールを設
けTiからなるバリアメタル層(10B)が500人程
変形成され。さらに八4からなる金属電極層(107)
が8000人程度形成された2層金属配線構造となって
いる。ボンディングパッドは、このバリアメタル層(1
0[i)及び金属電極層(107)により構成される。
このボンディングバッドヲトリ囲むように層間絶縁膜(
10g) 、パッシベーション膜(109)が設けられ
ており、このボンディングパッドにワイヤー(120)
が接続されている。層間絶縁膜(108)には例えばP
SG膜又はBPSG膜等が用いられパッシベーション膜
(109)にはPSG膜又はSiN膜が用いられている
この実施例のボンディングパッド構造によれば2層のポ
リシリコン層(103,105+ )間に用いたONO
絶縁膜(104)は硬質の膜であり、軟質のポリシリコ
ン膜と組み合わせることによってボンディングパッド(
106,107)と基板(101)間の機械的強度をよ
り高めることができこれによりクラックが発生する危険
性を抑えリーク電流を防止できる。
また、ONO絶縁膜(104)は極めて絶縁耐圧の高い
膜であり、たとえクラックが下地の酸化膜に発生しても
ONO膜(104)にはクラックが入らなければONO
絶縁膜(104)で絶縁性を確保できる。
よって信頼性の高い半導体装置が得られる。
また、ボンディングパッド(106,107)の下に2
層のポリシリコン層(103,105+ )を積層する
ことにより膜厚を厚くし機械的強度を増してワイヤーボ
ンディング時のクラックの発生を防止するとともにクラ
ックへの水分や可動イオン等の不純物の侵入を防止する
ことができる。
また第1図(b)は、本発明節2の実施例によるボンデ
ィングパッド部の構造を示す断面図である。
第1図(b)に示すように、本発明節2の実施例による
ボンディングパッド部は、第1の実施例のボンディング
パッド部の機械的強度をさらに増大させたもので、シリ
コン基板(101)上に順次積層された絶縁酸化膜(フ
ィールド酸化膜) (102)。
ポリシリコン膜(103) 、 ON O絶縁膜(10
4) 。
M o S iポリサイド膜(105)までは第1の実
施例における構造と同様であり、さらにその上部にPS
G膜又はBPSG膜からなる層間絶縁膜(108)が形
成されている。この層間絶縁膜(10g)の上部に第3
層の材料として例えばポリシリコン層(110)が10
00人程度形成されその上にTiからなるバリアメタル
層(10B>及びAJからなる金属電極層(107)の
2層金属配線層が形成された構造となっている。
本発明の第2の実施例では第1の実施例と同様に2層の
軟質のポリシリコン層(103,105+ )間に用い
た硬質のONO絶縁膜(104)の組み合わせによりボ
ンディングパッド(lOEi、107)と基板(101
)間の機械的強度を高めることができ、クラック発生の
危険性を抑えリーク電流を防止できる。また、電気的耐
圧性の高い膜であるONO絶縁膜(104)により、絶
縁性を確保できる。よって信頼性の高い半導体装置が得
られる。
また、ボンディングパッドの下に2層のポリシリコン層
(103,105+ )の積層と、さらに層間絶縁膜(
108)と、この上部のポリシリコン層(110)とが
設けられていることにより、膜厚をより厚くし、機械的
強度を、より高めることができ、ワイヤボンディング時
のクラックの発生を防止することができる。
ここで本発明節1.第2の実施例及び従来例において超
音波ボンディングを行なった際のボンディングパッドと
半導体基板との間に存在する膜におけるクラック発生頻
度及びボンディングパッドに電圧を印加した際、ボンデ
ィングパッドと半導体基板との間で生じる電気的リーク
の発生頻度の相対比較を第3図に示す。
縦軸はクラック発生及び電気的リーク発生の頻度を示し
ており従来例をともに1とする。第1の実施例の場合、
クラック発生頻度は約0.5となり従来例の半分に減り
、電気的リーク発生頻度は0である。第2の実施例の場
合では、クラック発生頻度及び電気的リーク発生頻度と
もにOとなっている。
このことより本発明の実施例によると従来例に比ベボン
ディングバソド部の電気的耐圧性が高くなることがわか
る。特に第2の実施例では、より電気的耐圧性が高くな
ることがわかる。この第2の実施例によるボンディング
パッド構造では前記第1の実施例に比べ層間絶縁膜(1
10)と、第3層の材料ポリシリコン膜(111)が設
けられているこにより膜厚が増し、より電気的耐圧性を
高められ、信頼性の高い半導体装置を得ることができる
尚、上記第1.第2の実施例はEPROMを例にとって
説明しているが、他の半導体装置でも同様である。また
前述の実施例では第1層、第2層ゲート材料及び第3層
の材料がポリシリコン又はポリサイドの場合について示
したが本発明はこれに限定されないことは言うまでもな
い。さらに第1層、第2層、第3層の材料がポリサイド
構造のように2種類以上の層の積層構造になっていても
良いことも言うまでもない。また2層ゲート間の絶縁膜
として実施例においては、ONO膜を用いているが他の
組合わせ、例えばNOや0NON等でも上記実施例同様
の効果を得ることができる。
[発明の効果] 以上詳述したように本発明のボンディングパッド構造に
よればボンディングパッドと基板との電気的耐圧性を高
め信頼性の高い半導体装置を得ることができる。
【図面の簡単な説明】
第1図(a)は本発明の第1の実施例におけるボンディ
ングパッド部の構造を示す断面図、第1図(b)は本発
明の第2の実施例におけるボンディングパッド部の構造
を示す断面図、第2図は本発明第1.第2の実施例及び
従来例において超音波ボンディングを行なった際のクラ
ック発生頻度及び電気的リーク発生頻度の相対比較図、 第3図は従来のボンディングパッドの構造を示す断面図
である。 101.201・・・シリコン基板、 102.202・・・フィールド酸化膜、103・・・
ポリシリコン膜(第1層のゲート材料)、104・・・
ONO絶縁膜、 1051・・・ポリシリコン膜、 1052・・・M o S i膜(第2層のゲート材料
)、108.203・・・バリアメタル層、107.2
04・・・金属電極層、 108・・・層間絶縁膜、 109.205・・・パッシベーション膜、110・・
・ポリシリコン膜(第3層の材料)、120.206・
・・ボンディングワイヤー出願代理人 則近憲佑 同 l  竹花喜久男 ν庭丁産41.・4乙 (ト  00 哨り寸 re)N OO()()O()O

Claims (2)

    【特許請求の範囲】
  1. (1)半導体基板と、この半導体基板上に形成されたポ
    リシリコン膜と、 このポリシリコン膜上に形成された酸化膜及び窒化膜に
    より構成される複合膜と、 この複合膜上に形成され、ボンディングパッドとして用
    いられる金属電極層と、を具備することを特徴とする半
    導体装置。
  2. (2)半導体基板と、この半導体基板上に形成された酸
    化膜及び窒化膜により構成される複合膜と、この複合膜
    上に形成されたポリシリコン膜、高融点金属層及び高融
    点金属シリサイド層のうちいずれか一つよりなる層と、 このポリシリコン膜、高融点金属層及び高融点金属シリ
    サイド層のうちいずれか一つよりなる層上に形成され、
    ボンディングパッドとして用いられる金属電極層と、を
    具備することを特徴とする半導体装置。
JP1105912A 1989-04-27 1989-04-27 半導体装置 Pending JPH02285638A (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP1105912A JPH02285638A (ja) 1989-04-27 1989-04-27 半導体装置
US07/513,973 US5036383A (en) 1989-04-27 1990-04-24 Semiconductor device having an improved bonding pad
DE69033229T DE69033229T2 (de) 1989-04-27 1990-04-26 Anschlussfläche für Halbleiteranordnung
EP90107998A EP0395072B1 (en) 1989-04-27 1990-04-26 Bonding pad used in semiconductor device
KR1019900005982A KR930010981B1 (ko) 1989-04-27 1990-04-27 반도체장치

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1105912A JPH02285638A (ja) 1989-04-27 1989-04-27 半導体装置

Publications (1)

Publication Number Publication Date
JPH02285638A true JPH02285638A (ja) 1990-11-22

Family

ID=14420077

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Country Status (5)

Country Link
US (1) US5036383A (ja)
EP (1) EP0395072B1 (ja)
JP (1) JPH02285638A (ja)
KR (1) KR930010981B1 (ja)
DE (1) DE69033229T2 (ja)

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Also Published As

Publication number Publication date
EP0395072A2 (en) 1990-10-31
EP0395072B1 (en) 1999-08-04
DE69033229D1 (de) 1999-09-09
KR900017136A (ko) 1990-11-15
DE69033229T2 (de) 1999-12-16
KR930010981B1 (ko) 1993-11-18
EP0395072A3 (en) 1991-07-17
US5036383A (en) 1991-07-30

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