JPS6217395B2 - - Google Patents

Info

Publication number
JPS6217395B2
JPS6217395B2 JP54087682A JP8768279A JPS6217395B2 JP S6217395 B2 JPS6217395 B2 JP S6217395B2 JP 54087682 A JP54087682 A JP 54087682A JP 8768279 A JP8768279 A JP 8768279A JP S6217395 B2 JPS6217395 B2 JP S6217395B2
Authority
JP
Japan
Prior art keywords
pellet
conductive layer
layer
bonding pad
electrode
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
Application number
JP54087682A
Other languages
English (en)
Other versions
JPS5612742A (en
Inventor
Hidetake Suzuki
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP8768279A priority Critical patent/JPS5612742A/ja
Publication of JPS5612742A publication Critical patent/JPS5612742A/ja
Publication of JPS6217395B2 publication Critical patent/JPS6217395B2/ja
Granted legal-status Critical Current

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    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
    • H01L24/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L24/02—Bonding areas ; Manufacturing methods related thereto
    • H01L24/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
    • H01L24/05—Structure, shape, material or disposition of the bonding areas prior to the connecting process of an individual bonding area
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    • H01L24/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
    • H01L24/06—Structure, shape, material or disposition of the bonding areas prior to the connecting process of a plurality of bonding areas
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  • Engineering & Computer Science (AREA)
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  • Die Bonding (AREA)
  • Junction Field-Effect Transistors (AREA)

Description

【発明の詳細な説明】 本発明は半導体装置の改良に関し、特に接地電
極の接続構造に関するものである。
半導体装置、例えばマイクロ波用のガリウム砒
素（GaAs）FETなどにおいて、ペレツト上の一
部をなす活性領域は、半絶縁性のGaAs基板上に
同じく半絶縁性のGaAsバツフア層を、例えばエ
ピタキシヤル技術によつて約５μｍの厚さにまで
積み上げた上で所定の導電型を有する不純物ドー
プ層をさらに0.3μｍ程度成長させ、第１図ａの
斜視図中に示した断面１を有する該不純物ドープ
層を所定の幅Ｌだけ残すように、その両側のお
よびなる領域の不純物ドープ層をメサ・エツチ
ングで除去することにより、同図中のの領域と
して形成される。このエツチングによつて同図中
の，の部分には不活性領域としての半絶縁性
バツフア層上面がそれぞれ露呈するから、前記活
性領域の中央部に導電層１７を被着してドレイ
ン電極となし、上記半絶縁性の不活性領域の面
上に該電極の延長部１６をボンデイング・パツド
として設けうる。また該ドレイン電極１７を、内
側から外側に向かつて順に囲むごとく、２重に配
設されたコの字型の各導電層の活性領域上の部
分はゲート電極およびソース電極となり、不活性
領域上の各延長部６および５の部分は、それぞ
れゲート・ボンデイング・パツドならびに接地用
ソース導電層となる。
このようなペレツト１００の裏面には、例えば
金（Au）蒸着層３が形成されており、ペレツト
１００はこの蒸着層３を第１図ｂに見られるパツ
ケージ中のヘツダ４の上面に、例えば金・錫
（Au・Sn）合金でろう付けすることによつて固着
される。但し、第１図ｂ中のペレツト断面図は第
１図ａ中に図示したペレツトの２点Ａ―A′間に
おけるものである。この際、ペレツト１００上面
の周辺導電層５（ソース電極の延長部）を接地接
続するに当つては、通常は該導電層５を下面蒸着
層３に接続して接地をとる次のような方法がとら
れる。即ち、基板層２およびバツフア層１５の２
ａおよび１５ａで示した側面を溶融状態のろう材
面に接触せしめてろうを塗布すれば該ろうはAu
蒸着層の３ａの部分ならびにソース導電層の５ａ
の部分にも同時に付着するために上記接続が完了
する。この方法は半絶縁性の基板ならびにバツフ
ア層上にあるソース導電層５をAuワイヤなどを
用いずに接地できるため、接地インダクタンスが
少なくなり、特に超高周波帯における半導体装置
の特性を充分に発揮させるための重要な技術の一
つとなつている。
しかるに上記したペレツト側面のろう材塗布の
際には、該ろう材がバツフア層１５の表面露呈部
１５ｂの面にまでしみ込んでソース導電層５ａと
ゲート・ボンデイング・パツド６とを橋絡せしめ
ることがあり、このために該半導体装置を破壊に
おとし入れることがしばしばにして起こる。加え
て、前記ろう材はソース導電層５ａ上に第２図ｂ
に見られるごとき盛り上がり部分２０を形成して
しまい、これは同図中に示された絶縁性支持台７
ａ上の外部リード端子８ａと、前記ペレツト１０
０上のボンデイング・パツド６との間にAuワイ
ヤを渡し、それぞれの部分を接続するに際して、
該ワイヤ９ａが前記したろうの盛り上がり項部２
０と接触せぬよう充分なたるみを持たせる必要性
を生じる。しかるに高周波信号の入力経路たるこ
のワイヤ９ａがそれだけ長くなれば、その結果は
信号入力端子に直列な寄生インダクタンスの増加
となつて現れ、高周波特性の顕著なる低下をもた
らす不都合がある。なお９ｂは他の絶縁性支持台
７ｂ上の外部リード端子８ｂの前記ペレツト１０
０上のドレイン・ボンデイング・パツド１６との
間に張り渡されるAuワイヤであつて、該ボンデ
イング・パツド１６側のペレツト上面には上記の
ようなろうの盛り上がり部分はないために、上記
Auワイヤ９ｂには特にたるみを持たせる必要は
ない。
本発明はこうした不都合に鑑みてなされたもの
で、ろう材の有害な侵入による電極間橋絡やAu
ワイヤの不必要なたるみを生ぜしめずに済む半導
体装置の構造を提供することを目的とするもので
ある。
本発明によれば、上記目的は半導体ペレツトの
基体上に部分的に形成された不純物ドープ層と、
該不純物ドープ層上に形成された第１及び第２の
電極と、該第１の電極に接続され該基体表面に被
着形成された第１の導電層からなるボンデイン
グ・パツドと、該ボンデイング・パツドが形成さ
れた領域の外側のペレツト端縁部分に形成され該
領域より低い段差部と、該段差部に形成され前記
第２の電極に接続された第２の導電層と、該第２
の導電層上から延在して被着形成され接地接続を
なす接地接続用導体とを有してなることにより達
成される。以下図面を用いて本発明の実施例に関
して詳述する。
第２図ａおよびｂは本発明に係る半導体装置の
構造の好ましい一実施例を示したものであつて、
前記第１図ａおよびｂと同一部位には同一記号を
付して示してある。
まず第２図ａから容易に理解されるごとく、ペ
レツト１００の不活性領域およびの端縁部に
は堀り下げ段差部口が設けられている。この堀り
下げ段差部口は２本の点線イよりも内側の活性領
域を含む所要の部分を例えばレジストで覆つた
上で、例えば硫酸（H2SO4）、過酸化水素
（H2O2）、ならびに水（H2O）からなるエツチン
グ液で、電極付け前のペレツトをエツチングする
ことによつて設けうる。
こうした堀り下げ段差部口が設けられたペレツ
トの上面にドレインおよびゲートの各電極が配設
される点は前記第１図と変るところはないが、接
地用ソース導電層は該ペレツト１００の上面部分
から前記の段差づけによつて露出した半絶縁性
GaAs基板上面２ｃにかけて連続するように形成
されている。このような形状のペレツトの裏面金
蒸着層３とソース導電層とをつなぐには、ペレツ
ト上面に配設された導電層５にはろう付けを行わ
ず、前記ペレツト端縁部の堀り下げ段差部口に形
成された導電層部分５ｂを該基板２の側面部２ａ
と共にろうでぬらすことによつて行われる。かく
てこのペレツト１００は第２図ｂに示したごと
く、やはりヘツダ４上面にろう付けによつて固着
されるのであるが、ろうの付着最上面は前記の段
差づけがなされた２ｃの部分における導電層５ｂ
上に止まることとなる。ただし第２図ｂ中のペレ
ツト断面図は第２図ａ中の２点Ｂ―B′間における
ものである。
このゆえに該ろう材がバツフア層１５の上面に
まで達してゲート・ボンデイング・パツド６とソ
ース導電層の５の部分を橋絡する事故が起こるこ
とはないし、更に好都合なことには絶縁性支持台
７ａ上の外部リード端子８ａとペレツト１００上
面のボンデイング・パツド６との間に張り渡され
るべきAuワイヤに対して、不必要なたるみを持
たせてろうの盛り上がり頂部との接触を避けると
いうような不都合もなくなり、このためAuワイ
ヤ９ａの張り渡しは最短距離をもつて実行しうる
ようになる。なおまたドレイン・ボンデイング・
パツドに近い端縁部における堀り下げ段差部２ｅ
は、作業者のミスにより誤つて前記２ａのペレツ
ト側面と反対側の側面２ｄをろうでぬらしてしま
つた場合に、該ろうの到達を上記堀り下げ段差部
２ｅ面上にてくい止めて、上記ドレイン・ボンデ
イング・パツド１６とヘツダ４の上面とがろうに
よつて橋絡されるという不詳事を未然に防ぎうる
効果を有する。
以上に述べた本発明に係るペレツト構造によれ
ば配設すべきAuワイヤに必要以上のたるみをも
たせる必要がなくなり、したがつてマイクロ波帯
における信号入力端子の有害なインダクタンス成
分を大幅に減少せしめ得て、この半導体装置が本
来有する特性を充分に発揮せしめうるので、実用
上極めて顕著な効果が期待できる。
【図面の簡単な説明】
第１図ａは従来構造の半導体装置のペレツトを
示す斜視図、また同図ｂは該ペレツトがヘツダ上
に固着され、金ワイヤ・ボンデイングがなされた
状態を示す側面図である。第２図ａは本発明に係
る新しい半導体装置のペレツト構造を示す斜視
図、さらに同図ｂはこの新しい半導体装置のペレ
ツトがヘツダ上に固着された状態を示す図であ
る。 １：活性領域の断面、２：半絶縁性のGaAs
基板、３：ペレツト裏面の金蒸着層、４：ヘツ
ダ、５：半絶縁性バツフア層上面のソース導電
層、６：ゲート・ボンデイング・パツド、７ａ，
７ｂ：絶縁性支持台、８ａ，８ｂ：外部リード端
子、９ａ，９ｂ：金ワイヤ、１５：バツフア層断
面、１６：ドレイン・ボンデイング・パツド、１
７：ドレイン電極、，：不活性領域、：活
性領域。

Claims (1)

  1. 【特許請求の範囲】 １ 半導体ペレツトの基体上に部分的に形成され
    た不純物ドープ層と、 該不純物ドープ層上に形成された第１及び第２
    の電極と、 該第１の電極に接続され該基体表面に被着形成
    された第１の導電層からなるボンデイング・パツ
    ドと、 該ボンデイング・パツドが形成された領域の外
    側のペレツト端縁部分に形成され該領域より低い
    段差部と、 該段差部に形成され前記第２の電極に接続され
    た第２の導電層と、 該第２の導電層上から延在して被着形成され接
    地接続をなす接地接続用導体とを有してなること
    を特徴とする半導体装置。
JP8768279A 1979-07-11 1979-07-11 Semiconductor device Granted JPS5612742A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8768279A JPS5612742A (en) 1979-07-11 1979-07-11 Semiconductor device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8768279A JPS5612742A (en) 1979-07-11 1979-07-11 Semiconductor device

Publications (2)

Publication Number Publication Date
JPS5612742A JPS5612742A (en) 1981-02-07
JPS6217395B2 true JPS6217395B2 (ja) 1987-04-17

Family

ID=13921695

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8768279A Granted JPS5612742A (en) 1979-07-11 1979-07-11 Semiconductor device

Country Status (1)

Country Link
JP (1) JPS5612742A (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02207894A (ja) * 1989-02-08 1990-08-17 Chubu Electric Power Co Inc 包括固定化微生物を用いる硝化方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5341173A (en) * 1976-09-28 1978-04-14 Nec Corp Manufacture of semiconductor device
JPS5367374A (en) * 1976-11-27 1978-06-15 Nec Corp Manufacture of schottky barrier field effect transistor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5341173A (en) * 1976-09-28 1978-04-14 Nec Corp Manufacture of semiconductor device
JPS5367374A (en) * 1976-11-27 1978-06-15 Nec Corp Manufacture of schottky barrier field effect transistor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02207894A (ja) * 1989-02-08 1990-08-17 Chubu Electric Power Co Inc 包括固定化微生物を用いる硝化方法

Also Published As

Publication number Publication date
JPS5612742A (en) 1981-02-07

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