JP2002231972A - 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
- JP2002231972A JP2002231972A JP2001030678A JP2001030678A JP2002231972A JP 2002231972 A JP2002231972 A JP 2002231972A JP 2001030678 A JP2001030678 A JP 2001030678A JP 2001030678 A JP2001030678 A JP 2001030678A JP 2002231972 A JP2002231972 A JP 2002231972A
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- JP
- Japan
- Prior art keywords
- semiconductor
- electrode
- diode
- semiconductor device
- lead
- 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.)
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Abstract
薄型のパッケージを得ると共に、ロスの小さい効率のよ
い半導体装置の製造方法を提供する。 【解決手段】 ダイシングストリートに設けた溝を利用
してダイオードのアノード電極をダイオード側面まで延
在する。段差を設けて変形したリードフレームを直接ダ
イオード側面と底面に固着する。これにより、ダイオー
ドとリードの間の無効部分を低減できるので装置の小型
化が実現する。更にダイオードの高さを抑制でき、薄型
化も可能となる。また、接続にボンディングワイヤを使
用しないのでロスの少ない効率のよい半導体装置の製造
方法を提供できる。
Description
の製造方法に関し、特にダイオードの薄型化・小型化を
実現し、ロスが少なく効率の良い半導体装置およびその
製造方法に関する。
は、ウェハからダイシングして分離した半導体素子をリ
ードフレームに固着し、金、アルミニウム又は銅などの
ワイヤ等で電気的に接続し、金型と樹脂注入によるトラ
ンスファーモールドによって半導体素子を封止し、リー
ドフレームを切断して個々の半導体装置毎に分離すると
いう工程が行われている。
キーバリアダイオードを例に示す。
は、N型半導体基板32表面に酸化膜33を形成し、半
導体素子領域を開口してMo又はTiの金属膜34によ
りショットキー障壁を形成する。その後表面にAl、C
u、Ni、Au、Ag等の金属をスパッタしてアノード
電極35を形成し、裏面にも金属を蒸着してカソード電
極36を形成する。
ダイオード31はカソードリード42のダイ部43上に
半田あるいは銀ペーストよりなるプリフォーム材44で
固着される。ダイオード31の下面は金の裏張り電極
(図示せず)によりカソード電極が形成され、上面には
Al等の蒸着によりアノード電極35が形成される。カ
ソードリード42はダイ部43と連結されているので、
カソード電極と直結され、アノード電極35は金、アル
ミニウム又は銅等のボンディングワイヤ45によりアノ
ードリード46と電気的に接続される。
グワイヤを使用せず、ダイオード31表面にMo又はT
i等の金属膜34を設けた後、Ni等の金属でアノード
電極35を形成し、別の接続用リード49によりアノー
ドリード46と半田接続する方法もある。
フレームをセットして、絶縁性樹脂を注入後、高温・加
圧状態で成形するトランスファモールド等により、ダイ
オード31とボンディングワイヤ45およびカソードリ
ード42、アノードリード46とを樹脂層50で封止す
る。
ドとリードの接続に金、アルミニウム、銅等のワイヤを
使用しているため、ワイヤ自体の抵抗が装置のオン抵抗
に加算され、素子の特性を妨げ、ロスの大きい半導体装
置となってしまう。
の場合、リード下の樹脂厚が0.1mm、リード厚みが0.1m
m、半導体チップ厚みが0.2mm、ボンディングワイヤの金
線アーチが0.2mm、樹脂表面からボンディングワイヤま
での距離をレーザー印刷の深さを考慮して0.1mmとする
と、完成品の半導体装置の高さは0.7mmとなる。ボンデ
ィングワイヤを使用せず別の接続用リードを半導体チッ
プ表面に接合する場合でも0.6mm程度となり、これ以上
の薄膜化が進まない問題があった。
続用リードを使用すると水平方向にその分の距離をあけ
る必要があり、小型化にも限界があった。
に鑑みてなされたものであり、相対向する2主面を有す
る半導体基板と、前記半導体基板の主面から広がる半導
体素子領域と、前記半導体基板の周辺に設けたエッチン
グ溝と、前記半導体基板の前記主面に設け、前記半導体
素子領域と接触し、前記エッチング溝側面まで延在され
た第1電極と、前記半導体基板の裏面に設けた第2電極
とを具備することを特徴とし、半導体素子の表面ではな
く、側面にリードフレームを直接接続することにより、
半導体素子の薄型化を実現するものである。更にボンデ
ィングワイヤまたは接続用リードを使用しないので、接
続に要する余分な領域が省け小型化も実現できる上、ワ
イヤ自体の抵抗が無くなるのでオン抵抗の低減に寄与で
きる半導体装置を提供できる。
成後に半導体素子形成領域を覆う第1の電極を形成する
工程と、半導体ウエファのダイシングストリートをエッ
チングして溝を形成する工程と、溝の側面に第1電極を
延在する工程と、半導体ウエファの裏面に第2電極を形
成後、前記溝の底面をダイシングして個々の半導体素子
に分割する工程とを具備することを特徴とし、小型化・
薄型化を実現し、特性も向上する半導体装置の製造方法
を提供できる。
実施の形態を詳述する。
ードを示す。本発明のダイオード10は、半導体基板1
と、半導体素子領域3と、エッチング溝7と、第1電極
5と、第2電極8と、リード12、16とから構成され
る。
する2主面を有する。
設けた酸化膜又は窒化膜2の一部を開口し、Mo又はT
i等の金属膜4によりショットキー障壁が形成される。
離する前に、ダイシングストリートをエッチングするこ
とにより半導体基板1の周辺に設けられるようにする。
基板1の主面に設け、半導体素子領域3と金属膜4を介
してコンタクトし、エッチング溝7側面まで延在され
る。Cu、Ni、Au、Ag又はAl等の金属で設け
る。
基板1の裏面に設けられる。
接続される。
りアノード電極5に接続される。
オードの側面まで延在したアノード電極に有る。
続用リードを使用せず、アノードリードを直接側面に接
続できるので、薄型化が実現できる。具体的にはボンデ
ィングワイヤの金線アーチの高さ(0.2mm)又は接続
用リードの厚み(0.1mm)分低減ができる。また、ボ
ンディングワイヤ等を引き出す必要も無いので小型化が
実現でき、ワイヤ自体の抵抗も無くなるのでロスの少な
い、効率の良いダイオードを提供できる。
図2から図6に示すように、半導体ウエファに半導体素
子領域形成後に半導体素子形成領域を覆う第1の電極を
形成する工程と、半導体ウエファのダイシングストリー
トをエッチングして溝を形成する工程と、溝の側面に第
1電極を延在する工程と、半導体素子の裏面に第2電極
を形成後、溝の底面をダイシングして個々の半導体素子
に分割する工程とから構成される。
半導体ウエファに半導体素子領域形成後に半導体素子形
成領域を覆う第1の電極を形成することである。
面に酸化膜又は窒化膜2を形成し、半導体素子領域3を
開口する。その後ショットキー障壁を形成するために開
口部を覆い、半導体基板にコンタクトするようMo又は
Tiをスパッタして金属膜4を形成する。その上にC
u、Al、Ni、Au又はAg等をスパッタしてアノー
ド電極5となる第1電極を形成する。
半導体ウエファのダイシングストリートをエッチングし
て溝を形成することである。
6を100μm程度エッチングして溝7を形成し、該溝7
の内壁に酸化膜又は窒化膜2を形成する。これにより、
半導体素子領域3の周囲に設けられた酸化膜又は窒化膜
2が溝7まで延在され、溝7の内壁を覆う形状になる。
溝の側面に第1電極を延在することである。
り、溝7の底面にレジストによるマスクをかけてアノー
ド電極5と同じ金属をスパッタする。これにより、半導
体素子領域3を覆うアノード電極5が、溝7の側面まで
延在された形状となる。この溝7の側面に延在されたア
ノード電極5は、後の工程で個々のダイオードに分離さ
れたとき、ダイオードの側面電極となる。従って、従来
のようにダイオード表面から電極を取り出すのではな
く、ダイオード側面にリードを直接接続できるので、ボ
ンディングワイヤや、接続用のリードを必要としない。
示す如く、半導体ウエファの裏面に第2電極を形成後、
溝の底面をダイシングして個々の半導体素子に分割する
ことである。
てカソード電極8となる第2電極を形成し、溝7の底面
をダイシングして個々のダイオード10に分割する(図
5(A))。これにより、図5(B)に示すようなアノ
ード電極5を素子側面まで延在したダイオード10が形
成される。
段差のできる形状に変形し、カソードリード12をダイ
オード10のカソード電極8に接続し、アノードリード
16をダイオード10側面のアノード電極5にろう材1
9等により固着する。その後、トランスファモールド等
により絶縁性樹脂20で封止してリードを切断する。
ら電極が取り出せるので、ボンディングワイヤであれば
金線アーチの高さ(0.2mm)、接続用リードでもその厚み
(0.1mm)が低減でき、電極を引き出して接続しないの
で小型化も実現できる。さらに、ボンディングワイヤあ
るいは接続用リード分の抵抗成分を低減できるので、ロ
スの小さい、効率の良い製品を製造することができる。
ば、第1に、ボンディングワイヤを必要としないのでそ
の抵抗が低減され、ロスの少ない効率の良い半導体装置
を製造できる。
側面まで延在して形成することにより、図6に示すよう
に横方向からアノードリード16を接続することができ
る。これにより、ボンディングワイヤまたは接続用リー
ドを引き出す長さが縮小できるのでパッケージの小型化
が実現できる。
型にできる。具体的には、半導体装置表面にワイヤボン
ディングした場合に比べて0.2mm、半導体装置表面に直
接別のリードを接続した場合と比較しても0.1mmの低減
となり、高さ制限が必要な製品には大変有効となる。
はショットキーバリアダイオードであるが、これに限ら
ず、一般のダイオード又はトランジスタについても同様
に実施できる。
Claims (4)
- 【請求項1】 相対向する2主面を有する半導体基板
と、 前記半導体基板の主面から広がる半導体素子領域と、 前記半導体基板の周辺に設けたエッチング溝と、 前記半導体基板の前記主面に設け、前記半導体素子領域
と接触し、前記エッチング溝側面まで延在された第1電
極と、 前記半導体基板の裏面に設けた第2電極とを具備するこ
とを特徴とする半導体装置。 - 【請求項2】 前記半導体基板と前記第1電極の界面に
ショットキーバリアが形成されることを特徴とする請求
項1に記載の半導体装置。 - 【請求項3】 半導体ウエファに半導体素子領域形成
後、半導体素子形成領域を覆う第1の電極を形成する工
程と、 前記半導体ウエファのダイシングストリートをエッチン
グして溝を形成する工程と、 前記溝の側面に第1電極を延在する工程と、 前記半導体ウエファの裏面に第2電極を形成後、前記溝
の底面をダイシングして個々の半導体素子に分割する工
程とを具備することを特徴とする半導体装置の製造方
法。 - 【請求項4】 前記半導体素子領域と前記第1電極の
界面にショットキーバリアが形成されることを特徴とす
る請求項3に記載の半導体装置の製造方法。
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10351028A1 (de) * | 2003-10-31 | 2005-06-09 | Infineon Technologies Ag | Halbleiter-Bauteil sowie dafür geeignetes Herstellungs-/Montageverfahren |
WO2013011548A1 (ja) * | 2011-07-15 | 2013-01-24 | 富士電機株式会社 | 半導体装置の製造方法 |
-
2001
- 2001-02-07 JP JP2001030678A patent/JP2002231972A/ja active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10351028A1 (de) * | 2003-10-31 | 2005-06-09 | Infineon Technologies Ag | Halbleiter-Bauteil sowie dafür geeignetes Herstellungs-/Montageverfahren |
DE10351028B4 (de) * | 2003-10-31 | 2005-09-08 | Infineon Technologies Ag | Halbleiter-Bauteil sowie dafür geeignetes Herstellungs-/Montageverfahren |
US7378741B2 (en) | 2003-10-31 | 2008-05-27 | Infineon Technologies Ag | Semiconductor component and corresponding fabrication/mounting method |
WO2013011548A1 (ja) * | 2011-07-15 | 2013-01-24 | 富士電機株式会社 | 半導体装置の製造方法 |
JPWO2013011548A1 (ja) * | 2011-07-15 | 2015-02-23 | 富士電機株式会社 | 半導体装置の製造方法 |
US9240456B2 (en) | 2011-07-15 | 2016-01-19 | Fuji Electric Co., Ltd. | Method for manufacturing semiconductor device |
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