JP2010157683A - 半導体集積回路装置 - Google Patents

半導体集積回路装置 Download PDF

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Publication number
JP2010157683A
JP2010157683A JP2009188913A JP2009188913A JP2010157683A JP 2010157683 A JP2010157683 A JP 2010157683A JP 2009188913 A JP2009188913 A JP 2009188913A JP 2009188913 A JP2009188913 A JP 2009188913A JP 2010157683 A JP2010157683 A JP 2010157683A
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Japan
Prior art keywords
integrated circuit
semiconductor integrated
circuit device
bonding
film
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JP2009188913A
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JP5331610B2 (ja
Inventor
Hiromi Shigihara
宏美 鴫原
Hiroshi Tsukamoto
博 塚本
Akira Yajima
明 矢島
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Renesas Technology Corp
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Renesas Technology Corp
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Priority to JP2009188913A priority Critical patent/JP5331610B2/ja
Priority to US12/628,869 priority patent/US8063489B2/en
Priority to CN200910224397A priority patent/CN101752334A/zh
Priority to CN201310725962.9A priority patent/CN103681595B/zh
Publication of JP2010157683A publication Critical patent/JP2010157683A/ja
Priority to US13/229,887 priority patent/US9466559B2/en
Priority to US13/952,596 priority patent/US20130313708A1/en
Application granted granted Critical
Publication of JP5331610B2 publication Critical patent/JP5331610B2/ja
Priority to US15/264,222 priority patent/US10818620B2/en
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Abstract

【課題】車載用等の半導体集積回路装置においては、一般に、実装上の都合で、金線等によるワイヤ・ボンディングによって半導体チップ上のアルミニウム・パッドと外部とが相互接続されることがある。しかし、これらの半導体集積回路装置は、比較的高温(摂氏150度前後)で長時間使用されるため、アルミニウムと金の相互作用によって、接続不良が発生する。
【解決手段】本願発明は、半導体集積回路装置(半導体装置または電子回路装置)の一部である半導体チップ上のアルミニウム系ボンディング・パッド上に、バリア・メタル膜を介して、電解金メッキ表面膜(金系金属メッキ膜)を設け、それと配線基板等(配線基体)の上に設けられた外部リード間を金ボンディング・ワイヤ(金系ボンディング・ワイヤ)で相互接続したものである。
【選択図】図12

Description

本発明は、半導体集積回路装置(半導体装置または電子回路装置)における半導体チップ上のパッド電極と外部との相互接続技術に適用して有効な技術に関する。
日本特表2004−533711号公報(特許文献1)または米国特許第6534863号公報(特許文献2)には、銅配線構造を有する半導体装置において、表面が酸化されやすいアルミニウム・パッドの代替として、下層からTaN(接着層)/Ta(バリア)/Cu(シード)/Ni(第1電気メッキ層)/Au(第2電気メッキ層)等からなるパッド上に金ワイヤをボンディングする技術が開示されている。
特表2004−533711号公報 米国特許第6534863号公報
車載用等の半導体集積回路装置においては、一般に、実装上の都合で、金線等によるワイヤ・ボンディング等によって半導体チップ上のアルミニウム・パッドと外部とが相互接続されることがある。しかし、これらの半導体集積回路装置は、比較的高温(摂氏150度前後)で長時間使用されるため、アルミニウムと金の相互作用によってカーケンダル・ボイド(Kirkendall Void)等の接続不良が発生する。
本願発明は、これらの課題を解決するためになされたものである。
本発明の目的は、信頼性の高い半導体集積回路装置を提供することにある。
本発明の前記並びにその他の目的と新規な特徴は本明細書の記述及び添付図面から明らかになるであろう。
本願において開示される発明のうち代表的なものの概要を簡単に説明すれば下記の通りである。
すなわち、本願発明は、半導体集積回路装置(半導体装置または電子回路装置)の一部である半導体チップ上のアルミニウム系または銅系のボンディング・パッド上に、バリア・メタル膜を介して、金系表面メタル層を設け、外部との接続のための金系または銅系のボンディング・ワイヤ接合またはボンディング・ボールを設けたものである。
本願において開示される発明のうち代表的なものによって得られる効果を簡単に説明すれば下記のとおりである。
すなわち、金系または銅系のボンディング・ワイヤまたはボンディング・ボールが金系表面膜を介してアルミニウム系または銅系のボンディング・パッド上にボンディングされているので、比較的高温で長時間使用しても、アルミニウム等と金の相互作用によって、接続不良が発生することがない。
本願の一実施の形態の半導体集積回路装置における半導体チップのパッド開口工程完了時点のデバイス縦構造図(図3の破線部分に対応)である。 本願の一実施の形態の半導体集積回路装置の製造工程のうち、パッド開口工程からワイヤ・ボンディングまでの流れを示すプロセス・フロー図である。 本願の一実施の形態の半導体集積回路装置における半導体チップ(図18のX−X’断面に対応)のデバイス断面プロセス・フロー図(パッド開口工程完了時点)である。 本願の一実施の形態の半導体集積回路装置における半導体チップ(図19のX−X’断面に対応)のデバイス断面プロセス・フロー図(バリア膜形成工程)である。 本願の一実施の形態の半導体集積回路装置における半導体チップ(図20のX−X’断面に対応)のデバイス断面プロセス・フロー図(レジスト膜塗布工程)である。 本願の一実施の形態の半導体集積回路装置における半導体チップ(図21のX−X’断面に対応)のデバイス断面プロセス・フロー図(レジスト膜開口工程)である。 本願の一実施の形態の半導体集積回路装置における半導体チップ(図22のX−X’断面に対応)のデバイス断面プロセス・フロー図(金メッキ工程)である。 本願の一実施の形態の半導体集積回路装置における半導体チップ(図23のX−X’断面に対応)のデバイス断面プロセス・フロー図(レジスト除去工程)である。 本願の一実施の形態の半導体集積回路装置における半導体チップ(図24のX−X’断面に対応)のデバイス断面プロセス・フロー図(バリア・メタル除去工程)である。 図9に対応する本願の一実施の形態の半導体集積回路装置における半導体チップの上面図である。 本願の一実施の形態の半導体集積回路装置の上面図である。 図11の破線部分に対応する模式断面図である。 図12において、ワイヤ・ボンディングの順序を入れ替えた例を示す模式断面図である。 図12において、配線基板を配線基板上の他の電子素子に置き換えた例を示す模式断面図である。 図12において、半導体チップのダイ・ボンディング先を配線基板上の他の電子素子(フリップ・チップ・ボンディングされたもの)に置き換えた例を示す模式断面図である。 本願の他の実施の形態(追加のファイナル・パッシベーションとして2層のポリイミド膜を設けた例)の半導体集積回路装置における半導体チップ(図25のX−X’断面に対応)のデバイス断面図(ウエハ工程完了時点)である。 図3に対応する本願の一実施の形態の半導体集積回路装置における半導体チップの上面図である。 図17の破線部の拡大上面図(対応断面は図3に示す)である。 図4に対応する工程における図17の破線部の拡大上面図である。 図5に対応する工程における図17の破線部の拡大上面図である。 図6に対応する工程における図17の破線部の拡大上面図である。 図7に対応する工程における図17の破線部の拡大上面図である。 図8に対応する工程における図17の破線部の拡大上面図である。 図9に対応する工程における図17の破線部の拡大上面図である。 図16に対応する工程における拡大上面図である。 ニッケル表面上における無電界金メッキの問題点を説明するための説明断面図である。 本願の一実施の形態の半導体集積回路装置の製造工程におけるウエハ・プローブ・テスト工程の様子を示すウエハ上面拡大図(第1の例;正方形パッド)である。 図27に対応する例のワイヤ・ボンディング完了時のウエハ上面拡大図(第1の例;正方形パッド)である。 本願の一実施の形態の半導体集積回路装置の製造工程におけるウエハ・プローブ・テスト工程の様子を示すウエハ上面拡大図(第2の例;正規型長方形パッド)である。 図29に対応する例のワイヤ・ボンディング完了時のウエハ上面拡大図(第2の例;正規型長方形パッド)である。 本願の一実施の形態の半導体集積回路装置の製造工程におけるウエハ・プローブ・テスト工程の様子を示すウエハ上面拡大図(第3の例;変形型長方形パッド)である。 図31に対応する例のワイヤ・ボンディング完了時のウエハ上面拡大図(第3の例;変形型長方形パッド)である。 アルミニウム金接合に現れるカーケンダル・ボイド(Kirkendall Void)を説明するためのアルミニウム・パッドおよびボンディング・ワイヤの局部模式断面図である。 本願の一実施の形態の半導体集積回路装置におけるパッド上のボンディング・ワイヤの接合状態の各種の例(正規モード)を示す局部断面図である。 本願の一実施の形態の半導体集積回路装置におけるパッド上のボンディング・ワイヤの接合状態の各種の例(横ずれモード1)を示す局部断面図である。 本願の一実施の形態の半導体集積回路装置におけるパッド上のボンディング・ワイヤの接合状態の各種の例(横ずれモード2)を示す局部断面図である。 本願の一実施の形態の半導体集積回路装置におけるパッド上のボンディング・ワイヤの接合構造の各種寸法の関係を説明するための局部断面図である。 本願の一実施の形態の半導体集積回路装置(ワイヤ・ボンディング型BGA)のパッケージ工程完成時の全体上面図(見やすいようにレジン封止体を取り払っている)である。 図38の模式断面図である。 本願の一実施の形態の半導体集積回路装置(QFP:Quad Flat Package)のパッケージ工程完成時の全体上面図(見やすいようにレジン封止体の上半部を取り払っている)である。 図40の模式断面図である。 本願の一実施の形態の半導体集積回路装置(フリップ・チップ型BGA)のパッケージ工程完成時の全体上面図である。 図42の模式断面図である。 図43の破線部の拡大断面図である。 本願の一実施の形態の半導体集積回路装置における各種のアンダ・バンプ・メタル構造(2層構造)を説明するためのパッド周辺断面図である。 図45の変形例のパッド周辺断面図である。 本願の一実施の形態の半導体集積回路装置における各種のアンダ・バンプ・メタル構造(3層以上の多層構造)を説明するためのパッド周辺断面図である。
〔実施の形態の概要〕
先ず、本願において開示される発明の代表的な実施の形態について概要を説明する。
1.以下を含む半導体集積回路装置:
(a)半導体チップのデバイス面上に設けられたアルミニウム系または銅系のパッド電極;
(b)前記パッド電極上に設けられたバリア・メタル膜;
(c)前記バリア・メタル膜上に設けられた金を主要な成分とする表面金属膜;
(d)前記表面金属膜上に接合された金または銅を主要な成分とするボンディング・ボールまたはボンディング・ワイヤ。
2.前記1項の半導体集積回路装置において、前記表面金属膜の厚さは、前記バリア・メタル膜の厚さよりも厚い。
3.前記1または2項の半導体集積回路装置において、前記表面金属膜は、電解メッキまたはスパッタリングにより形成されたものである。
4.前記1から3項のいずれか一つの半導体集積回路装置において、前記表面金属膜は、電解メッキにより形成されたものである。
5.前記1から4項のいずれか一つの半導体集積回路装置において、前記表面金属膜の面積は、前記パッド電極上の絶縁膜開口の面積よりも大きい。
6.前記1から5項のいずれか一つの半導体集積回路装置において、前記パッド電極の面積は、前記表面金属膜の面積よりも大きい。
7.前記1から6項のいずれか一つの半導体集積回路装置において、前記パッド電極上の絶縁膜開口は、平面的に言って、前記表面金属膜の内部にある。
8.前記1から7項のいずれか一つの半導体集積回路装置において、前記表面金属膜は、平面的に言って、前記パッド電極の内部にある。
9.前記1から4項のいずれか一つの半導体集積回路装置において、前記表面金属膜は、前記パッド電極のない領域にまで延在している。
10.前記1から9項のいずれか一つの半導体集積回路装置において、前記ボンディング・ボールは、ボンディング・ワイヤのボール部である。
11.前記1から10項のいずれか一つの半導体集積回路装置において、前記ボンディング・ボールは、金を主要な成分とする部材から構成されている。
12.前記1から10項のいずれか一つの半導体集積回路装置において、前記ボンディング・ボールは、銅を主要な成分とする部材から構成されている。
13.前記1から12項のいずれか一つの半導体集積回路装置において、前記パッド電極は、アルミニウム系または銅系のパッド電極である。
14.前記1から13項のいずれか一つの半導体集積回路装置において、前記バリア・メタル膜は、チタンを主要な成分とする。
15.前記1から13項のいずれか一つの半導体集積回路装置において、前記バリア・メタル膜は、チタン、クロム、窒化チタン、および窒化タングステンからなる群から選択された一つを主要な成分とする。
16.前記1から15項のいずれか一つの半導体集積回路装置において、更に以下を含む:
(e)前記バリア・メタル膜と前記表面金属膜の間に設けられたシード・メタル膜。
17.前記16項の半導体集積回路装置において、前記シード・メタル膜は、パラジウムを主要な成分とする。
18.前記16項の半導体集積回路装置において、前記シード・メタル膜は、銅、金、ニッケル、白金、ロジウム、モリブデン、タングステン、クロムおよびタンタルからなる群から選択された一つを主要な成分とする。
19.前記1から18項のいずれか一つの半導体集積回路装置において、前記パッド電極は、平面的に言って、ほぼ正方形形状を呈している。
20.前記1から18項のいずれか一つの半導体集積回路装置において、前記パッド電極は、平面的に言って、ほぼ長方形形状を呈している。
次に、本願において開示される発明のその他の実施の形態について概要を説明する。
1.以下を含む半導体集積回路装置:
(a)配線基板;
(b)前記配線基板上、または前記配線基板上に設置された第1の電子素子上に固定された第1の半導体チップ;
(c)前記第1の半導体チップのデバイス面上に設けられたアルミニウム系または銅系のパッド電極;
(d)前記パッド電極上に設けられたバリア・メタル膜;
(e)前記バリア・メタル膜上に設けられたシード・メタル膜;
(f)前記シード・メタル膜上に設けられた金を主要な成分とする電解メッキによる表面金属膜;
(g)前記第1の半導体チップの外部に設けられた外部メタル電極;
(h)前記表面金属膜と前記外部メタル電極を相互に接続する金を主要な成分とするボンディング・ワイヤ。
2.前記1項の半導体集積回路装置において、前記パッド電極は、アルミニウム系のパッド電極である。
3.前記1または2項の半導体集積回路装置において、前記バリア・メタル膜は、チタンを主要な成分とする。
4.前記1から3項のいずれか一つの半導体集積回路装置において、前記シード・メタル膜は、パラジウムを主要な成分とする。
5.前記1、2、および4項のいずれか一つの半導体集積回路装置において、前記バリア・メタル膜は、チタン、クロム、窒化チタン、および窒化タングステンからなる群から選択された一つを主要な成分とする。
6.前記1から3および5項のいずれか一つの半導体集積回路装置において、前記シード・メタル膜は、銅、金、ニッケル、白金、ロジウム、モリブデン、タングステン、クロムおよびタンタルからなる群から選択された一つを主要な成分とする。
7.前記1から6項のいずれか一つの半導体集積回路装置において、前記第1の半導体チップは、前記配線基板上に固定されている。
8.前記1から6項のいずれか一つの半導体集積回路装置において、前記第1の半導体チップは、前記配線基板上の前記第1の電子素子上に固定されている。
9.前記1から8項のいずれか一つの半導体集積回路装置において、前記外部メタル電極は、前記配線基板上にある。
10.前記1から8項のいずれか一つの半導体集積回路装置において、前記外部メタル電極は、前記配線基板上の前記第1の電子素子上にある。
11.前記1から10項のいずれか一つの半導体集積回路装置において、前記ボンディング・ワイヤは、前記表面金属膜側を第1ボンディング点とする。
12.前記1から10項のいずれか一つの半導体集積回路装置において、前記ボンディング・ワイヤは、前記表面金属膜側を第2ボンディング点とする。
13.前記1から12項のいずれか一つの半導体集積回路装置において、前記外部メタル電極の表面には、金、銀、またはパラジウムを主要な成分とする金属膜が設けられている。
14.(a)配線基板;
(b)前記配線基板上、または前記配線基板上に設置された第1の電子素子上に固定された第1の半導体チップ;
(c)前記第1の半導体チップのデバイス面上に設けられたアルミニウム系または銅系のパッド電極;
(d)前記パッド電極上に設けられたバリア・メタル膜;
(e)前記バリア・メタル膜上に設けられたシード・メタル膜;
(f)前記シード・メタル膜上に設けられた金を主要な成分とする表面金属膜;
(g)前記第1の半導体チップの外部に設けられた外部メタル電極;
(h)前記表面金属膜と前記外部メタル電極を相互に接続する金を主要な成分とするボンディング・ワイヤ
を有する半導体集積回路装置の製造方法であって、以下の工程を含む:
(I)半導体ウエハのほぼ全面に前記シード・メタル膜を形成する工程;
(II)前記シード・メタル膜上に、開口部を有するレジスト膜を形成する工程;
(III)電解メッキにより前記開口部にメッキ層を形成することによって、前記表面金属膜を形成する工程。
次に、本願において開示される発明の更にその他の実施の形態について概要を説明する。
1.以下を含む半導体集積回路装置:
(a)半導体チップのデバイス面上に設けられたアルミニウム系または銅系のパッド電極;
(b)前記パッド電極上に設けられたバリア・メタル膜;
(c)前記バリア・メタル膜上に設けられた金を主要な成分とする電解メッキによる表面金属膜;
(d)前記表面金属膜上に接合された金または銅を主要な成分とするボンディング・ボールまたはボンディング・ワイヤ。
2.前記1項の半導体集積回路装置において、前記パッド電極は、アルミニウム系のパッド電極である。
3.前記1または2項の半導体集積回路装置において、前記バリア・メタル膜は、チタンを主要な成分とする。
4.前記1から3項のいずれか一つの半導体集積回路装置において、更に以下を含む:
(e)前記バリア・メタル膜と前記表面金属膜の間に設けられたシード・メタル膜。
5.前記4項の半導体集積回路装置において、前記シード・メタル膜は、パラジウムを主要な成分とする。
6.前記1、2、4および5項のいずれか一つの半導体集積回路装置において、前記バリア・メタル膜は、チタン、クロム、窒化チタン、および窒化タングステンからなる群から選択された一つを主要な成分とする。
7.前記4または6項の半導体集積回路装置において、前記シード・メタル膜は、銅、金、ニッケル、白金、ロジウム、モリブデン、タングステン、クロムおよびタンタルからなる群から選択された一つを主要な成分とする。
〔本願における記載形式・基本的用語・用法の説明〕
1.本願において、実施の態様の記載は、必要に応じて、便宜上複数のセクションに分けて記載する場合もあるが、特にそうでない旨明示した場合を除き、これらは相互に独立別個のものではなく、単一の例の各部分、一方が他方の一部詳細または一部または全部の変形例等である。また、原則として、同様の部分は繰り返しを省略する。また、実施の態様における各構成要素は、特にそうでない旨明示した場合、理論的にその数に限定される場合および文脈から明らかにそうでない場合を除き、必須のものではない。
更に、本願において、「半導体集積回路装置」というときは、主に、各種トランジスタ(能動素子)を中心に、抵抗、コンデンサ等を半導体チップ等(たとえば単結晶シリコン基板)上に集積したものをいう。ここで、各種トランジスタの代表的なものとしては、MOSFET(Metal Oxide Semiconductor Field Effect Transistor)に代表されるMISFET(Metal Insulator Semiconductor Field Effect Transistor)を例示することができる。このとき、集積回路構成の代表的なものとしては、Nチャネル型MISFETとPチャネル型MISFETを組み合わせたCMOS(Complemetary Metal Oxide Semiconductor)型集積回路に代表されるCMIS(Complemetary Metal Insulator Semiconductor)型集積回路を例示することができる。
今日の半導体集積回路装置、すなわち、LSI(Large Scale Integration)のウエハ工程は、通常、原材料としてのシリコンウエハの搬入からプリ・メタル(Premetal)工程(M1配線層下端とゲート電極構造の間の層間絶縁膜等の形成、コンタクト・ホール形成、タングステン・プラグ、埋め込み等からなる工程)あたりまでのFEOL(Front End of Line)工程と、M1配線層形成から始まり、アルミニウム系パッド電極上のファイナル・パッシベーション膜へのパッド開口の形成あたりまで(ウエハ・レベル・パッケージ・プロセスにおいては、当該プロセスも含む)のBEOL(Back End of Line)工程に大別できる。FEOL工程の内、ゲート電極パターニング工程、コンタクト・ホール形成工程等は、特に微細な加工が要求される微細加工工程である。一方、BEOL工程においては、ビアおよびトレンチ形成工程、特に、比較的下層のローカル配線(たとえば4層程度の構成の埋め込み配線では、M1からM3あたりまで、10層程度の構成の埋め込み配線では、M1からM5あたりまでの微細埋め込み配線)等において、特に微細加工が要求される。なお、「MN(通常N=1から15程度)」で、下から第N層配線を表す。M1は第1層配線であり、M3は第3層配線である。
2.同様に実施の態様等の記載において、材料、組成等について、「AからなるX」等といっても、特にそうでない旨明示した場合および文脈から明らかにそうでない場合を除き、A以外の要素を主要な構成要素のひとつとするものを排除するものではない。たとえば、成分についていえば、「Aを主要な成分として含むX」等の意味である。たとえば、「シリコン部材」等といっても、純粋なシリコンに限定されるものではなく、SiGe合金やその他シリコンを主要な成分とする多元合金、その他の添加物等を含む部材も含むものであることはいうまでもない。同様に、「酸化シリコン膜」、「酸化シリコン系絶縁膜」等と言っても、比較的純粋な非ドープ酸化シリコン(Undoped Silicon Dioxide)だけでなく、FSG(Fluorosilicate Glass)、TEOSベース酸化シリコン(TEOS-based silicon oxide)、SiOC(Silicon Oxicarbide)またはカーボンドープ酸化シリコン(Carbon-doped Silicon oxide)またはOSG(Organosilicate glass)、PSG(Phosphorus Silicate Glass)、BPSG(Borophosphosilicate Glass)等の熱酸化膜、CVD酸化膜、SOG(Spin ON Glass)、ナノ・クラスタリング・シリカ(Nano-Clustering Silica:NSC)等の塗布系酸化シリコン、これらと同様な部材に空孔を導入したシリカ系Low-k絶縁膜(ポーラス系絶縁膜)、およびこれらを主要な構成要素とする他のシリコン系絶縁膜との複合膜等を含むことは言うまでもない。
また、酸化シリコン系絶縁膜と並んで、半導体分野で常用されているシリコン系絶縁膜としては、窒化シリコン系絶縁膜がある。この系統の属する材料としては、SiN,SiCN,SiNH,SiCNH等がある。ここで、「窒化シリコン」というときは、特にそうでない旨明示したときを除き、SiNおよびSiNHの両方を含む。同様に、「SiCN」というときは、特にそうでない旨明示したときを除き、SiCNおよびSiCNHの両方を含む。
なお、SiCは、SiNと類似の性質を有するが、SiONは、むしろ、酸化シリコン系絶縁膜に分類すべき場合が多い。
窒化シリコン膜は、SAC(Self−Aligned Contact)技術におけるエッチ・ストップ膜として、多用されるほか、SMT(Stress Memorization Technique)における応力付与膜としても使用される。
同様に、「銅配線」、「アルミニウム配線」、「アルミニウム・パッド」、「金バンプ(金表面膜)」等といっても、純粋なものばかりでなく、アルミニウム又は金を主要な成分とするもの、すなわち「銅系配線」、「アルミニウム系配線」、「アルミニウム系パッド」、「金系バンプ(金系表面金属膜)」を指すものとする。また、これらの表現は、当該部分の主要部がそれらの材料からできていることを指すのであって、必ずしも当該部分の全体が、それらの材料からできていることを指すものではないことは言うまでもない。
以上のことは、「バリア・メタル」、「シード・メタル」等についても同じである。
3.同様に、図形、位置、属性等に関して、好適な例示をするが、特にそうでない旨明示した場合および文脈から明らかにそうでない場合を除き、厳密にそれに限定されるものではないことは言うまでもない。
4.さらに、特定の数値、数量に言及したときも、特にそうでない旨明示した場合、理論的にその数に限定される場合および文脈から明らかにそうでない場合を除き、その特定の数値を超える数値であってもよいし、その特定の数値未満の数値でもよい。
5.「ウエハ」というときは、通常は半導体集積回路装置(半導体装置、電子装置も同じ)をその上に形成する単結晶シリコンウエハを指すが、エピタキシャルウエハ、SOI基板、LCDガラス基板等の絶縁基板と半導体層等の複合ウエハ等も含むことは言うまでもない。
6.「ボンディング・パッド」は、本願においては、主にその上に、パッド上メタル多層構造またはバンプ構造(バリア・メタルから表面金属膜まで)を形成するアルミニウム系パッド等を指す。ボンディング・パッドは、アルミニウム系に限らず、銅系でもよい。
7.本願においては、ボンディング・パッド上に形成された電界メッキ等による(直下のバリア・メタル層等と比較して)比較的厚い金等の端子電極(外部接続用電極)、すなわち「表面メタル層」を、本来の直接接続のためのバンプ電極ではないが、形状の類似性を考慮して便宜上、「金バンプ」、「バンプ電極」または「バンプ電極層」等とも呼ぶ場合がある。なお、本来のバンプ電極は通常15マイクロ・メートル程度の厚さを有するが、表面メタル層は通常1から5マイクロ・メートル程度の厚さを有する。但し、表面メタル層としての金層の下に銅やニッケル等の電解メッキ層を比較的厚く付ける例においては、それらの層を表面メタル層の一部と見ると、全体としては15マイクロ・メートル程度の厚さとなる場合もある。
「ボンディング・ボール」というときは、ボール・ボンディングにおいて、第1ボンディング点にできるボール形状の金属塊又はそれが変形したもののほか、スタッド・バンプ(Stud Bump)等のボンディング・ワイヤ起因のボール形状の金属塊又はそれが変形したものを指す。
8.本願において、「配線基板」は、汎用されているガラス・エポキシ等の有機配線基板(単層および多層)の外、フレキシブル配線基板、セラミック配線基板、ガラス配線基板等を含む。また、配線基板上の「電子素子」はパッケージに封入された半導体装置、半導体チップ、その他のチップ状部品(抵抗、コンデンサなど)等を含む。
〔実施の形態の詳細〕
実施の形態について更に詳述する。各図中において、同一または同様の部分は同一または類似の記号または参照番号で示し、説明は原則として繰り返さない。
1.本願の一実施の形態の半導体集積回路装置におけるアルミニウム系パッド上のパッド開口完成時点でのデバイス断面構造の説明(主に図1)
図1は本願発明の実施の形態の半導体集積回路装置の製造方法による65nmテクノロジ・ノードのデバイスの断面構造の一例を示すデバイス断面図(パッド開口完成時点)である。図1に基づいて、本願の実施形態の半導体集積回路装置のデバイス構造の概要を説明する。
図1に示すように、たとえば、STI(Shallow Trench Isolation)型の素子分離フィールド絶縁膜2で分離されたP型単結晶シリコン基板1のデバイス面上には、PチャネルMOSFETまたはNチャネルMOSFETのゲート電極8が形成されている。それらの上には、エッチ・ストップ膜である窒化シリコン・ライナー膜4(たとえば約30nm)が形成されている。その上には、窒化シリコン・ライナー膜4よりもずっと厚く、下層の熱CVD法によるオゾンTEOS酸化シリコン膜(たとえば約200nm)および上層のプラズマTEOS酸化シリコン膜(たとえば約270nm)等からなるプリ・メタル(Premetal)層間絶縁膜5が形成されている。また、これらのプリ・メタル絶縁膜を貫通して、タングステン・プラグ3が形成されている。ここまでがプリ・メタル領域PMである。
その上の第1配線層M1は、下層のSiCN膜(たとえば約50nm)等の絶縁性バリア膜14および主層間絶縁膜であるプラズマシリコン酸化膜15(たとえば約150nm)等およびそれらに形成された配線溝に埋め込まれた銅配線13等から構成されている。
その上の第2配線層から第6配線層M2,M3,M4,M5,M6は、相互にほぼ同様の構造をしている。各層は、下層のSiCO膜(たとえば約30nm)/SiCN膜(たとえば約30nm)等からなる複合絶縁性バリア膜(ライナー膜)24、34,44、54,64、および上層のほとんどの領域を占める主層間絶縁膜25,35,45,55,65等から構成されている。この主層間絶縁膜25,35,45,55,65は、下層よりカーボン・ドープ酸化シリコン膜、すなわち、SiOC膜(たとえば約350nm)とキャップ膜であるプラズマTEOSシリコン酸化膜(たとえば約80nm)等からなる。これらの層間絶縁膜を貫通して、銅プラグおよび銅配線を含む銅埋め込み配線23,33,43,53,63が形成されている。
その上の第7配線層から第8配線層M7,M8は、相互にほぼ同様の構造をしている。各層は、下層のSiCN膜(たとえば約70nm)等の絶縁性バリア膜74,84および上層の主層間絶縁膜75,85等から構成されている。この主層間絶縁膜75,85は、下層よりプラズマTEOSシリコン酸化膜(たとえば約250nm)、FSG膜(たとえば約300nm)、およびキャップ膜であるUSG膜(たとえば約200nm)等からなる。これらの層間絶縁膜を貫通して、銅プラグおよび銅配線を含む銅埋め込み配線73,83が形成されている。
その上の第9配線層から第10配線層M9,M10は、相互にほぼ同様の構造をしている。各層は下層の層間と上層の層内に分かれている。層間絶縁膜は、下層のSiCN膜(たとえば約70nm)等の絶縁性バリア膜94b,104bおよび上層の主層間絶縁膜等から構成されている。主層間絶縁膜は下層のFSG膜95b,105b(たとえば約800nm)及び上層のキャップ膜であるUSG膜96b,106b(たとえば約100nm)等から構成されている。また、層内絶縁膜は、下層のSiCN膜(たとえば約50nm)等の絶縁性バリア膜94a,104aおよび上層の主層間絶縁膜等から構成されている。主層内絶縁膜は下層のFSG膜95a,105a(たとえば約1200nm)及び上層のキャップ膜であるUSG膜96a,106a(たとえば約100nm)等から構成されている。これらの層間絶縁膜および層内絶縁膜等を貫通して、銅プラグおよび銅配線を含む銅埋め込み配線93,103が形成されている。
その上の最上層配線層(パッド層)APは、下層のSiCN膜114(たとえば約100nm)等の絶縁性バリア膜、中間のUSG膜117(たとえば約900nm)等の主層間絶縁膜、および、最外部のプラズマSiN119(たとえば約600nm)等のファイナル・パッシベーション膜等から構成されている。また、これらの層間絶縁膜を貫通して、タングステン・プラグ113が設けられており、USG膜117上にはアルミニウム系のボンディング・パッド118(たとえば約1000nm)が設けられている。このアルミニウム系のボンディング・パッド118とタングステン・プラグ113には、必要に応じて、下層のチタン接着層151(たとえば約10nm)および上層の窒化チタン・バリアメタル層152(たとえば約30nm)が設けられている。また、ボンディング・パッド118上には、窒化チタン層153(たとえば約70nm)が形成されており、この膜とプラズマSiN119に開口が形成され、ボンディング・パッド開口163となっている。
なお、アルミニウム系のボンディング・パッド118の代わりに、銅系のボンディング・パッドにしてもよい。
2.本願の一実施の形態の半導体集積回路装置の製造方法におけるボンディング・パッド開口の後のプロセス等の説明(主に図2、図3から図9、図16、図17から図24および図25)
次に、図3から図9、図17から図24等に基づいて、本願発明の一実施の形態の半導体集積回路装置の製造方法におけるボンディング・パッド上メタル層構造(表面メタル層または金バンプ等)の形成プロセスを説明する。
図2は本願の一実施の形態の半導体集積回路装置の製造工程のうち、パッド開口工程からワイヤ・ボンディングまでの流れを示すプロセス・フロー図である。図3は本願の一実施の形態の半導体集積回路装置における半導体チップ(図18のX−X’断面に対応)のデバイス断面プロセス・フロー図(パッド開口工程完了時点)である。図4は本願の一実施の形態の半導体集積回路装置における半導体チップ(図19のX−X’断面に対応)のデバイス断面プロセス・フロー図(バリア膜形成工程)である。図5は本願の一実施の形態の半導体集積回路装置における半導体チップ(図20のX−X’断面に対応)のデバイス断面プロセス・フロー図(レジスト膜塗布工程)である。図6は本願の一実施の形態の半導体集積回路装置における半導体チップ(図21のX−X’断面に対応)のデバイス断面プロセス・フロー図(レジスト膜開口工程)である。図7は本願の一実施の形態の半導体集積回路装置における半導体チップ(図22のX−X’断面に対応)のデバイス断面プロセス・フロー図(金メッキ工程)である。図8は本願の一実施の形態の半導体集積回路装置における半導体チップ(図23のX−X’断面に対応)のデバイス断面プロセス・フロー図(レジスト除去工程)である。図9は本願の一実施の形態の半導体集積回路装置における半導体チップ(図24のX−X’断面に対応)のデバイス断面プロセス・フロー図(バリア・メタル除去工程)である。図16は本願の他の実施の形態(追加のファイナル・パッシベーションとして2層のポリイミド膜を設けた例)の半導体集積回路装置における半導体チップ(図25のX−X’断面に対応)のデバイス断面図(ウエハ工程完了時点)である。図17は図3に対応する本願の一実施の形態の半導体集積回路装置における半導体チップの上面図である。図18は図17の破線部の拡大上面図(対応断面は図3に示す)である。図19は図4に対応する工程における図17の破線部の拡大上面図である。図20は図5に対応する工程における図17の破線部の拡大上面図である。図21は図6に対応する工程における図17の破線部の拡大上面図である。図22は図7に対応する工程における図17の破線部の拡大上面図である。図23は図8に対応する工程における図17の破線部の拡大上面図である。図24は図9に対応する工程における図17の破線部の拡大上面図である。図25は図16に対応する工程における拡大上面図である。
まず、図3、図17、および図18に示すように多数のデバイスや配線(酸化シリコン膜や種々のメタル層で形成されている)が形成されたパッド下の配線を含むウエハ101の主面上にたとえばシリコン・ナイトライド等(無機系のみでなく有機系の膜でもよい)のファイナル・パッシベーション膜119(図16に示すように、更にその上にポリイミド系樹脂層120を形成することもある)が形成されており、そのアルミニウム・パッド118に対応する部分には、パッド開口163(ファイナル・パッシベーション膜119にあけられた開口)が設けられている(図2のパッド開口工程201で形成)。
次に図3の状態で、ボンディング・パッド118表面の自然酸化膜を除去するために、アルゴンを主要な成分とする雰囲気中でスパッタリング・エッチを実行する(図2のスパッタ・エッチ202)。
次に図4及び図19に示すようにスパッタリング成膜により、バリア&シード・メタル層(アンダー・バンプ・メタル膜)67が形成される。下層のバリア・メタル膜121としては、たとえば厚さ175マイクロ・メータ程度(150から200マイクロ・メータ程度が好適な範囲として例示することができる)のチタン膜を例示することができる(図2のTiスパッタ工程203)。また、上層のシード・メタル膜122としては、たとえば厚さ175マイクロ・メータ程度(150から200マイクロ・メータ程度が好適な範囲として例示することができる)のパラジウム膜を例示することができる(図2のPdスパッタ工程204)。
次に、図5及び図20に示すように、その上に、塗布システム等を用いて、たとえば4マイクロ・メートル程度(2から6マイクロ・メータ程度が好適な範囲として例示することができる)の厚さのポジ型レジスト膜12(必要に応じてネガ型でもよい)が形成される(図2のレジスト塗布工程205)。
次に、図6および図21に示すように、レジストを露光(たとえばi線光露光)、現像(たとえばアルカリ現像)することで開口66を形成する(図2の露光工程206および現像工程207)。続いて、開口66の底の有機汚染を除去する等のために、酸素アッシャー処理(酸素プラズマ処理)を実施(たとえば常温で120秒程度の時間)する(図2のOアッシング工程208)。
次に、図7および図22に示すように、開口66に電気メッキで、たとえば2マイクロ・メータ程度(好適な範囲としては1から5マイクロ・メータ程度)の厚さの表面メタル層(バンプ電極)115となる金層を埋め込む(図2の電解メッキ工程209)。メッキ条件としては、たとえば300φウエハについて言えば、亜硫酸金ナトリウム・メッキ液を使用し、液温は摂氏55度、電流値は0.1から1A/dm、メッキ時間20分程度を例示することができる。
次に図8および図23に示すように、レジスト膜12を除去する(図2のレジスト除去工程210)。続いて、有機汚染を除去する等のために、酸素アッシャー処理(酸素プラズマ処理)を実施(たとえば常温で120秒程度の時間)する(図2のOアッシング工程211)
最後に図9および図24に示すように、表面メタル層(金バンプ電極)115をマスクにしてウエット・エッチングで不要なバリア&シード・メタル層67(UBM膜)を順次選択除去する(図2のPdウエット・エッチング工程212およびTiウエット・エッチング工程213)。シード・メタル膜122のエッチング液としては、ヨウ素系のエッチング液を、バリア膜121のエッチング液としては、アンモニアと過酸化水素の混合液等を例示することができる。続いて、有機汚染を除去する等のために、酸素アッシャー処理(酸素プラズマ処理)を実施(たとえば常温で120秒程度の時間)する(図2のOアッシング工程214)。
これで表面メタル層(バンプ電極)が一応完成したことになる。表面メタル層(金バンプ電極)115は、通常、比較的純粋な金材料から構成されている。しかし、基本的には、金を主要な成分とする金系合金で構成することができる。セクション3においては、図9の破線部分のその後の工程等を説明する。
なお、前記バリア・メタル膜は、チタン、クロム、窒化チタン、および窒化タングステンからなる群から選択された一つを主要な成分とするものとすることができる。バリア・メタル膜には、スパッタ成膜可能性と十分な対金バリア性が要求される。
更に、シード・メタル膜は、銅、金、ニッケル、白金、ロジウム、モリブデン、タングステン、クロムおよびタンタルからなる群から選択された一つを主要な成分とするものとすることができる。シード・メタル膜には、バリア・メタル膜と反応しないこと、金と脆弱な反応層を形成しないこと、および、電解金層が成長できる程度に低抵抗材料であることが要求される。
図16は、図3から図9等に説明した構造に対する変形例である。図16および図25の例では、プラズマSiN(パッド上の無機ファイナル・パッシベーション)119をパターニングした上に、有機系パッシベーション膜であるポリイミド膜120を形成およびパターニング(ポリイミド膜開口123)したものである。この例は、加工及び構造は複雑になるが信頼性の向上の点では有利である。また、この構造の代わりに、又は、この構造に加えて、無機ファイナル・パッシベーション119を下層の無機系絶縁膜と上層のポリイミド膜とすることもできる。
3.本願の一実施の形態の半導体集積回路装置の製造方法における組み立てプロセスおよびデバイス構造の説明(図10から図12、合わせて図2および図9等を参照)
このセクションでは、セクション2で説明したプロセスに続き、図2のO2アッシング工程214からワイヤ・ボンディング工程219(スタッド・バンプを使用する場合は、スタッド・バンプ形成)までを説明する。
図10は図9に対応する本願の一実施の形態の半導体集積回路装置における半導体チップの上面図である。図11は本願の一実施の形態の半導体集積回路装置の上面図である。図12は図11の破線部分に対応する模式断面図である。
図2に示すように、図9(図16)で説明したO2アッシング工程214(図2)の後、ウエハ101に対して、プローブ・テスト215(ウエハ検査)が実行される。その後、ウエハ101の裏面を研削して所定の厚さにするバック・グラインディングすなわちBG工程216が実行される。続いて、レーザ、回転ブレード、又はその両方を用いて、ウエハ101を個々のチップ101に分割するダイシング工程217を実行する。このチップ101に分割された状態を次に示す。
図10は、図9(または図16)に対応する本願の一実施の形態の半導体集積回路装置における半導体チップ101の上面全体図である。同図において、半導体チップ101のほぼ全面は、ファイナル・パッシベーション119(120)に覆われており、周辺部の各パッド上には、表面メタル層115が設けられている。
次に、図11および図12(図11の破線部分の拡大断面)に示すように、たとえば有機多層配線基板等(単層配線基板でもよい)の配線基板133(セラミック基板やフレキシブル配線基板等でもよい)上に、接着材層130(ダイ・アタッチ・フィルム、ペースト等)を介して、半導体チップ101をダイ・ボンディングする(図2のダイ・ボンディング工程218)。
次に、図12に示すように、金を主要な成分とするボンディング・ワイヤ132およびボンディング・キャピラリ171を用いて、チップ101(ダイ)上のボンディング・パッド118上の表面メタル層115(表面金層)とチップ101の外部のリード部131(この場合は、配線基板133上)間を接続する(図2のワイヤ・ボンディング工程219であり、ボンディング温度は、たとえば摂氏150程度である)。この場合は、表面メタル層115側がボール134を伴うボール・ボンディング(1次ボンディング部135)で、リード部131側がウエッジ・ボンディング(2次ボンディング部136)である(両方をセットとして「ボール・ボンディング」、「ボール・ウエッジ・ボンディング」、「ネイル・ヘッド・ボンディング」等という)。ボンディングの方式としては、低温化の要請から、サーモ・ソニック・ボンディング(加熱と超音波エネルギーの組み合わせによる)が好適である。このようにチップ側にボール134を用いてボンディングするもの(チップ側が2次ボンディング部となるもの)を、次セクションの図14のような「逆方向ボンディング」と区別して、特に「順方向ボンディング」という。
本実施の形態においては、特性的に微妙な半導体チップ側のアルミニウム系(銅系でも同じ)ボンディング・パッド上にバリア・メタル等の中間メタル層を介して、金を主要な成分とする表面金属層が形成されているので、金を主要な成分とする(たとえばパラジウムその他の添加物を許容する)金系ボンディング・ワイヤで、配線基板等との相互接続をとった場合でも、高温長時間使用による不所望な反応の進行を回避することができる。
なお、リード部131の表面は、信頼性の観点から、いわゆるボンディング金属膜(金、銀、パラジウムまたはこれらの合金等を主要な成分とする金属膜)となっていることが望ましい。
4.本願の一実施の形態の半導体集積回路装置の製造方法における組み立てプロセスおよびデバイス構造の変形例の説明(図13から図15)
ここでは、セクション3で説明した組み立てプロセスおよび組み立て構造に対する種々の変形例について説明する。
図13は図12において、ワイヤ・ボンディングの順序を入れ替えた例を示す模式断面図である。図14は図12において、配線基板を配線基板上の他の電子素子に置き換えた例を示す模式断面図である。図15は図12において、半導体チップのダイ・ボンディング先を配線基板上の他の電子素子(フリップ・チップ・ボンディングされたもの)に置き換えた例を示す模式断面図である。
(1)逆順ボンディング方式(逆方向ボンディング)の説明(図13)
図13に示すように、図12のワイヤ・ボンディングの順序を逆転させてもよい。すなわち、逆方向ボンディングである。この場合は、表面メタル層115側が、2次ボンディング部136となるので、ワイヤ・ループが低くなるメリットがある。通常のアルミニウム系ボンディング・パッド118への直接接続では、デバイスへの衝撃の問題があるが、この例では、比較的厚い表面金層115があるので、当該問題の影響は比較的小さい。
なお、セクション3と同様に、リード部131の表面は、信頼性の観点から、いわゆるボンディング金属膜(金、銀、パラジウムまたはこれらの合金等を主要な成分とする金属膜)となっていることが望ましい。
(2)2チップ間ワイヤ・ボンディング方式の説明(図14)
この例は、図14に示すように、図12及び図13と異なり、半導体チップ101が配線基板133に直接ではなく、配線基板133上の他の半導体チップ101b(より広くはデバイス・チップ)すなわち下地チップ(下地電子素子以下同じ)上にダイ・ボンディングされている。ここで、ボンディング・ワイヤ132で、半導体チップ101上の表面メタル層115と下地チップ101b上の表面メタル層115とを相互接続する場合において、他の半導体チップ101bが半導体チップ101と同様なパッド上メタル多層構造を有する場合は、両ボンディング部が信頼性の高い構造となる。
なお、逆方向ボンディングを適用することもできる。
(3)フリップ・チップ上ダイ・ボンディング方式の説明(図15)
図15に示すように、半導体チップ101のダイ・ボンディングは、配線基板133上にフリップ・チップ・ボンディング(配線基板133上の半田バンプ用ランド電極138への半田バンプ137による接続)された他の半導体チップ101bすなわち下地チップ上に実行してもよい。この場合は、ボンディング・ワイヤ132による相互接続は、半導体チップ101上の表面メタル層115と前記下地チップ101b以外のデバイス・チップ上の電極(リード部)または配線基板133上のリード部131となる。
なお、セクション3と同様に、リード部131の表面は、信頼性の観点から、いわゆるボンディング金属膜(金、銀、パラジウムまたはこれらの合金等を主要な成分とする金属膜)となっていることが望ましい。
また、逆方向ボンディングを適用することもできる。
5.本願の一実施の形態の半導体集積回路装置の各種パッケージ形態の説明(主に図38から図44)
このセクションでは、本願の一実施の形態の半導体集積回路装置(他の実施の形態でも同じ)の各種パッケージ形態について説明する。
図38は本願の一実施の形態の半導体集積回路装置(ワイヤ・ボンディング型BGA)のパッケージ工程完成時の全体上面図(見やすいようにレジン封止体を取り払っている)である。図39は図38の模式断面図である。図40は本願の一実施の形態の半導体集積回路装置(QFP:Quad Flat Package)のパッケージ工程完成時の全体上面図(見やすいようにレジン封止体の上半部を取り払っている)である。図41は図40の模式断面図である。図42は本願の一実施の形態の半導体集積回路装置(フリップ・チップ型BGA)のパッケージ工程完成時の全体上面図である。図43は図42の模式断面図である。図44は図43の破線部の拡大断面図である。
先ず始めに、図38及び図39に基づいて、配線基板133(たとえば、有機系多層配線基板)を用いたワイヤ・ボンディング型BGAについて説明する。図38及び図39に示すように、配線基板133上に接着剤層130(たとえばダイ・アタッチ・フィルムやダイ・ボンド・ペースト等)を介してデバイス・チップ101(半導体チップ)がダイ・ボンディングされている。デバイス・チップ101の上面には複数の表面メタル層115(ボンディング・パッド上)が設けられており、配線基板133の上面に設けられた複数の外部リード131との間は、ボンディング・ワイヤ132によって、接続されている。この例では、表面メタル層115側にボンディング・ボール134が作られている。配線基板133の上面側は封止レジン181によって封止されている。一方、配線基板133の下面側には、複数の半田バンプ137が設けられている。
次に、図40及び図41に基づいて、ワイヤ・ボンディング型QFP(リードフレームを用いたレジン・パッケージ)について説明する。図40及び図41に示すように、4本のダイ・パッド・サポート・バー146に保持されたダイ・パッド145上には、接着剤層130(たとえばダイ・アタッチ・フィルムやダイ・ボンド・ペースト等)を介してデバイス・チップ101(半導体チップ)がダイ・ボンディングされている。デバイス・チップ101の上面には複数の表面メタル層115(ボンディング・パッド上)が設けられており、複数のリード131との間は、ボンディング・ワイヤ132によって、接続されている。この例では、表面メタル層115側にボンディング・ボール134が作られている。リード131の内側、ダイ・パッド・サポート・バー146、ダイ・パッド145、デバイス・チップ101、およびボンディング・ワイヤ132は、レジン封止体181(封止レジン)によって封止されている。
次に図42から図44に基づいて、フリップ・チップ型BGA(たとえば、金系スタッド・バンプによるフリップ・チップ接続)について説明する。図42から図44に示すように、配線基板133上には、複数のランド・パッド155が設けられており、このランド・パッド155とデバイス・チップ101の下面の複数の表面メタル層115(ボンディング・パッド下)下の金系スタッド・バンプ157(銅系でもよい)とが、半田層156(たとえば、銀3.5重量%、残りは錫からなる鉛フリー半田等)を介して、相互に接続されている。この接続は、アンダ・フィル・レジン148(たとえば、シリカ粉末入りのエポキシ系レジン等)によって補強されている。配線基板133の下面には、外部接続用の半田バンプ137(たとえば、銀3.5重量%、銅0.5重量%、残りは錫からなる鉛フリー半田等)が設けられている。
6.本願の一実施の形態の半導体集積回路装置の製造方法におけるウエハ・プローブ検査等の説明(主に図27から図32)
このセクションでは、セクション3の図2で説明したプローブ・テスト215およびワイヤ・ボンディング工程219について更に説明する。
図27は本願の一実施の形態の半導体集積回路装置の製造工程におけるウエハ・プローブ・テスト工程の様子を示すウエハ上面拡大図(第1の例;正方形パッド)である。図28は図27に対応する例のワイヤ・ボンディング完了時のウエハ上面拡大図(第1の例;正方形パッド)である。図29は本願の一実施の形態の半導体集積回路装置の製造工程におけるウエハ・プローブ・テスト工程の様子を示すウエハ上面拡大図(第2の例;正規型長方形パッド)である。図30は図29に対応する例のワイヤ・ボンディング完了時のウエハ上面拡大図(第2の例;正規型長方形パッド)である。図31は本願の一実施の形態の半導体集積回路装置の製造工程におけるウエハ・プローブ・テスト工程の様子を示すウエハ上面拡大図(第3の例;変形型長方形パッド)である。図32は図31に対応する例のワイヤ・ボンディング完了時のウエハ上面拡大図(第3の例;変形型長方形パッド)である。これらに基づいて、ボンディング・パッドおよび表面メタル層の形状(配向も含む)とプローブ針ならびにボンディング・ワイヤとの関係等を説明する。
まず、図27に基づいて、正方形パッドによるプローブ・テスト215(図2)について説明する。図27に示すように、平面的に言うと、表面メタル層115とボンディング・パッド118は、ほぼ相似形(この場合はボンディング・パッド118が若干大きい)をした同心配置(中心をほぼ共有する)となっている。ここで、表面メタル層115とボンディング・パッド118以外の部分は、ほとんどプラズマSiN119(パッド上の無機ファイナル・パッシベーション)等によって被覆されている。プローブ・テスト215の際には、複数のプローブ針221を対応する複数の表面メタル層115にコンタクトさせる。表面メタル層115が金系メタル材料(高純度金または金を主要な成分とするメタル)であるときは、コンタクト性に優れている。これは、金系メタル材料は、表面に自然酸化膜をほとんど生成しないことによる。従って、必然的にコンタクト・ダメージも小さい(コンタクト荷重およびオーバ・ドライブ量も比較的小さい値とすることができる)。このことは、例えばパッド下の配線層間絶縁膜に機械的に脆弱なLow−k層膜等を用いた場合において有効である。
次に、図28に基づいて、正方形パッドによるワイヤ・ボンディング工程219について説明する。図28に示すように、この場合は、プローブ・テスト215の際にプローブ針221がコンタクトしたのと同じ場所で、ボンディング・ワイヤ132(ボンディング・ボール134)との接合を形成することになるが、表面メタル層115の存在により、Alパッドの表面がめくれて、コンタクト痕が残るような場合と違って、コンタクト・ダメージが小さい(ほとんどコンタクト痕が残らない)ので、ボンディング特性に悪影響を及ぼさないメリットがある。
次に、図29および図30に基づいて、正規型長方形パッドによるプローブ・テスト215およびワイヤ・ボンディング工程219(図2)について説明する。図29および図30に示すように、平面的に言うと、表面メタル層115とボンディング・パッド118は、ほぼ相似形(この場合はボンディング・パッド118が若干大きい)をした同心配置(中心をほぼ共有する)となっている。しかし、この例では、表面メタル層115とボンディング・パッド118が長方形を呈しているので、プローブ針221がコンタクトした部分と異なる場所に、ワイヤ・ボンディングを実行することができる。このため、各種のプローブ・テストにおいて、例えば検査の繰り返し(再検査)等が実施され、コンタクト・ダメージが比較的大きくなるような場合においても、そのワイヤ・ボンディングへの影響を回避することができる。
次に、図31および図32に基づいて、変形型長方形パッドによるプローブ・テスト215およびワイヤ・ボンディング工程219(図2)について説明する。図31および図32に示すように、平面的に言うと、表面メタル層115は長方形を呈しており、ボンディング・パッド118の方は、ほぼ正方形を呈している。また、配向又は位置関係については、一部重なっているが、相互にずれて配置されている。ボンディング・パッド118のない部分等では、表面メタル層115は、アンダ・バンプ・メタル層(バリア&シード・メタル層)67を介して、プラズマSiN(パッド上の無機ファイナル・パッシベーション)119上に形成されている。従って、前述の正規型長方形パッドと同様のメリットを得ることができる。通常、プローブする部分の下方には、ボンディング・パッド118のようなクッション材(衝撃緩和層)が存在することが望ましいが、表面メタル層115が金系メタル材料である場合は硬度を確保でき、コンタクト・ダメージを比較的小さくできる場合が多いので、図31のような下にボンディング・パッド118がない部分で、プローブ針221をコンタクトさせても、下層のプラズマSiN(パッド上の無機ファイナル・パッシベーション)119へ与えるダメージを小さくすることができる。なお、ワイヤ・ボンディング点は、表面メタル層115上のボンディング可能な位置に設定可能であるが、図32に示すように、ボンディング・パッド118がある部分に設定することにより、ダメージが発生する確率を低減することができる。
7.本願の一実施の形態の半導体集積回路装置の各種の表面メタル層下メタル層構造(またはアンダ・バンプ・メタル構造)の説明(主に図45から図47)
ここでは、以上説明した各種の表面メタル層下メタル層構造について更に説明する。
図45は本願の一実施の形態の半導体集積回路装置における各種のアンダ・バンプ・メタル構造(2層構造)を説明するためのパッド周辺断面図である。図46は図45の変形例のパッド周辺断面図である。図47は、本願の一実施の形態の半導体集積回路装置における各種のアンダ・バンプ・メタル構造(3層以上の多層構造)を説明するためのパッド周辺断面図である。
まず、図45に基づいて、本願の一実施の形態の半導体集積回路装置の基本的表面メタル層下メタル層構造について説明する。この場合は、図45に示すように、たとえば、アルミニウム系ボンディング・パッド118上にチタンを主要な成分とするバリア・メタル膜121(スパッタリング成膜により、厚さは、たとえば、0.175マイクロ・メートル程度)、その上に、パラジウムを主要な成分とするシード・メタル膜122(スパッタリング成膜により、厚さは、たとえば、0.175マイクロ・メートル程度)、および更にその上に金を主要な成分とする電解メッキ金系バンプ電極115(金バンプ、表面メタル層、またはオーバ・パッド・メタル)を積層している(厚さは、たとえば、2.8マイクロ・メートル程度、範囲としては、たとえば、1マイクロ・メートルから3マイクロ・メートル程度)。ここで、チタン膜121は、アルミニウムおよび金に対する相互拡散バリアである。パラジウム膜122は電解メッキ金系表面メタル層115の形成のためのシード膜である。
次に、図46に基づいて、図45の例の変形例を説明する。図46に示すように、この構造は、シード・メタル膜122と電解メッキ金系表面メタル層115の間に、電解ニッケル・メッキ層127(厚さは、たとえば、2マイクロ・メートル程度)を介在させたものである。ニッケルは金等に比べて硬いのでワイヤ・ボンディングによるダメージの低減に有効である。
次に、図47に基づいて、3層以上の多層構造を有するアンダ・バンプ・メタル構造の一例を説明する。この場合は、図47に示すように、たとえば、アルミニウム系ボンディング・パッド118上にクロムを主要な成分とするバリア・メタル膜124(スパッタリング成膜により、厚さは、たとえば、0.075マイクロ・メートル程度)、その上に、銅を主要な成分とするシード・メタル膜125(スパッタリング成膜により、厚さは、たとえば、0.25マイクロ・メートル程度)、更にその上に、銅を主要な成分とする電解銅メッキ層126(厚さは、たとえば、2マイクロ・メートル程度、範囲としては、必要に応じて、たとえば、1マイクロ・メートルから10マイクロ・メートル程度)、更にその上に、ニッケルを主要な成分とする電解ニッケル・メッキ層127(厚さは、たとえば、2マイクロ・メートル程度)、および更にその上に金を主要な成分とする電解メッキ金系バンプ電極115(金バンプ、表面メタル層、またはオーバ・パッド・メタル)を積層している(厚さは、たとえば、2.8マイクロ・メートル程度、範囲としては、たとえば、1マイクロ・メートルから3マイクロ・メートル程度)。ここで、クロム膜124は、アルミニウムおよび銅に対する相互拡散バリアである。銅膜125は銅電解メッキ膜126の形成のためのシード膜である。
この構造の特徴は、電解メッキ金系バンプ電極115の下に、比較的厚く、かつ、硬いニッケル層および銅層があるので、ワイヤ・ボンディングによるダメージの低減に有効であるほか、ニッケル層および銅層からなる高信頼性の再配線(低抵抗再配線)としての活用も可能である。また、外部端子の低抵抗化においても有効である。
8.各種実施形態に関する考察(主に図26および図33から図37)
このセクションでは、各実施の形態に共通な、または、各実施の形態に固有な特徴、技術的効果等の説明または、その他の補足的説明を行う。
図26はニッケル表面上における無電界金メッキの問題点を説明するための説明断面図である。図33はアルミニウム金接合に現れるカーケンダル・ボイド(Kirkendall Void)を説明するためのアルミニウム・パッドおよびボンディング・ワイヤの局部模式断面図である。図34は本願の一実施の形態の半導体集積回路装置におけるパッド上のボンディング・ワイヤの接合状態の各種の例(正規モード)を示す局部断面図である。図35は本願の一実施の形態の半導体集積回路装置におけるパッド上のボンディング・ワイヤの接合状態の各種の例(横ずれモード1)を示す局部断面図である。図36は本願の一実施の形態の半導体集積回路装置におけるパッド上のボンディング・ワイヤの接合状態の各種の例(横ずれモード2)を示す局部断面図である。図37は本願の一実施の形態の半導体集積回路装置におけるパッド上のボンディング・ワイヤの接合構造の各種寸法の関係を説明するための局部断面図である。
まず、図26に基づいて、電解金メッキの代わりに無電界金メッキ(金に限らず、銅、ニッケルについてもほぼ同じ)を用いた場合の問題点を、ニッケル表面301上に無電界金メッキ(置換金メッキ)する場合を例に説明する。図26に示すように、無電界金メッキは、下地金属であるニッケルが抜けた303の部分に金部材302が付着することにより形成される。金メッキ領域302は、表面を覆った段階でメッキ反応が停止するため、金メッキ領域302自体はポーラス(多孔)な状態である。そのため、このポーラス部分からニッケルが析出し易く、析出したニッケルは酸化され、酸化ニッケル(NiO)が形成される。この酸化ニッケルが金メッキ領域302上に存在すると、ボンディング・ワイヤが付きづらく、例え付いたとしても剥がれ易くなる。また、金メッキ領域302が一旦表面を覆った段階でメッキ反応は停止するため、一般に100nm程度(0.1マイクロ・メートル程度)以上のメッキ厚を確保することは困難である。更に、ニッケル表面301と金メッキ領域302との界面には、ボイドが形成されているため十分な接着(密着)が確保できず、金層の剥がれ(界面剥離)が起きやすい。
これに対して、電解メッキでは、メッキ反応は外部からの電界により進行するので、緻密なメッキ膜を形成することが可能であり、無電解金メッキより厚い膜厚を形成することも容易である。このことは、下地がニッケルである場合に限られたものではないことは言うまでもない。
次に、図33に基づいて、アルミニウム系パッド上に金系などの表面メタル層115を介在させることなく、直接、金系等のボンディング・ワイヤ(またはボンディング・ボール)を接合したときの問題点について説明する。アルミニウム系パッド上に直接、金系等のボンディング・ワイヤを接合した状態で、長時間比較的降温状態(たとえば、摂氏150度程度)に保持すると、図33に示すように、アルミニウムと金の界面近傍に、Au−Al系金属間化合物層140、141、142、143(たとえば、AuAl層140,AuAl層141,AuAl層142,AuAl層143)が出現する。それに伴って、ボンディング・ボール134側にボイド139(カーケンダル・ボイド)が形成され、接合の破断の原因となる。これは、Au−Al系金属間化合物層140、141、142、143中における金の拡散速度が、Au−Al系金属間化合物層140、141、142、143中におけるアルミニウムの拡散速度に比較して、はるかに速いことに起因している。すなわち、金イオンが高速でアルミニウム系パッド118側へ移動する結果、その後に空孔(Vacancy)が多数生成し、徐々に凝集してボイドとなったものである。
これに対して、アルミニウム系パッド118上に、バリア層を挟んで金系などの表面メタル層115を介在させることにより、ボンディング特性を確保しつつ、ボイドの発生を有効に防止することができる。
次に、図34から図36に基づいて、金系などの表面メタル層115への金系(または銅系)ボンディング・ワイヤ132(またはボンディング・ボール134)の接合の各種モードについて説明する。図34には、正常モードを示す。すなわち、ここにおいては、ボンディング・ボール134が、表面メタル層115の上面内に収まっている。図35の例は、ずれモードの一つであり、ボンディング・ボール134の主要接合部(ボールの中心部)が表面メタル層115の上面内に収まっているので、特性的には問題のないものである。図36の例は、ずれモードの他の一つであり、ボンディング・ボール134の主要接合部(ボールの中心部)が表面メタル層115の上面内に収まっているものの、ボール134自体が変形もしくはボール134が表面メタル層115の端部を変形させて、ボール134の下端がプラズマSiN(パッド上の無機ファイナル・パッシベーション)119の表面に達しているものである。この場合も、表面メタル層115の衝撃吸収力のために、プラズマSiN(パッド上の無機ファイナル・パッシベーション)119等にクラック等が発生することは稀であり、製品特性としても問題が発生する場合は少ない。このように、これまで説明してきた主な特徴は、図34から図36に示すような場合においても適用可能であり、言い換えると、図34から図36に示すような場合は、総じてワイヤ・ボンディング部の主要部が、ボンディング・パッドのほぼ直上領域にあるということができる。
次に、図37(図28、図30、図32および図45から図47を参照)に基づいて、本願の各実施の形態の半導体集積回路装置におけるパッド上のボンディング・ワイヤの接合構造、すなわち、オーバ・パッド・メタル(Over Pad Metal)構造の各種寸法の関係を説明する。図37に示すように、標準的なレイアウト(正規構造)では、パッドの幅LPが全方位において最も広く、パッド開口の幅LWが全方位において最も狭く、表面メタル層の幅LBは全方位においてそれらの中間である。従って、平面的に言って、表面メタル層115がボンディング・パッド118の内部に含まれ(表面メタル層115の方が面積的に小さい)、同様に、ボンディング・パッド開口163は表面メタル層115の内部に含まれる(ボンディング・パッド開口163の方が面積的に小さい)。
しかし、図32のような不正規構造では、横方向の特定の方位について、このような大小関係および包含関係を満たすに過ぎない。縦方向では、このような関係を全て満たすわけではない。
同様に、図37に示すように、標準的な構造においては、表面メタル層の厚さ(又は、それに等価な厚さ)TBは、バリア・メタル層の厚さTU(通常は、バリア・メタル膜121の厚さ)よりも厚い。このように表面メタル層115が、比較的厚いのは、実質的なボンディング・パッドとしての特性を確保するためである。しかし、周辺のパラメータの変更等により、表面メタル層の厚さTBとバリア・メタル層の厚さTUが同程度となる場合も、当然考えられ、また、両者の関係が逆転する場合も考えられる。従って、表面メタル層は、電解メッキばかりでなく、たとえば、薄い場合または一部分のみの場合は、スパッタリング成膜や無電界メッキによって形成することもできる。特に、スパッタリング成膜は、ウエハのほぼ全体に成膜した後にフォト・エッチする加工方法となるので、無駄な(捨てる)部分が発生してしまうことや、膜の内部ストレスが強くウエハの反りの原因となる場合が多い、といったデメリットはあるが、メッキ膜に比べて非常に清浄な膜を形成できるメリットがある。
なお、図46および図47のように、バリア・メタル層121(またはバリア&シード・メタル層67)上の電解メッキ層が複数存在するときは、表面メタル層の厚さTBとしては、それらの電解メッキ層全体の厚さをとった方が理論的に整合する。また、シード・メタル層(たとえば、銅)と上層の電解メッキ層(たとえば、銅)のように、同質の層である場合は、シード・メタル層は、電解メッキ層の厚さの一部を構成するとした方が実際上妥当である。
また、図37において、図32のように一定の方位または方向において、表面メタル層の幅LBをパッドの幅LPよりも広くすることができる。そのようにすることで、ボンディング・ポイント(ワイヤ・ボンディングする場所)の自由度を増大させることができる。同様に、全方位又は方向において、表面メタル層の幅LBをパッドの幅LPよりも広くすることも可能である。更に、一定の方位または方向(あるいは全方位又は方向)において、表面メタル層の幅LBをパッド開口の幅LWよりも小さくすることができる。そのようにすることで、金の消費量を低減することができるほか、種々のレイアウト自由度が増加するメリットがある。
9.サマリ
以上本発明者によってなされた発明を実施形態に基づいて具体的に説明したが、本発明はそれに限定されるものではなく、その要旨を逸脱しない範囲において種々変更可能であることは言うまでもない。
例えば、前記実施の形態では、銅ダマシン配線等のダマシン配線(銅、銀等を主要な配線要素とする埋め込み配線)を有する半導体チップについて、具体的に説明したが、本願発明はそれに限定されるものではなく、アルミニウム系通常配線(非埋め込み配線)を有する半導体チップを用いたものにも適用できることは言うまでもない。
なお、前記実施の形態では、ボンディング・ワイヤまたはボンディング・ボール(スタッド・バンプを含む)の材料となるボンディング・ワイヤとしては主に、金系ワイヤを例にとり説明したが、ボンディング・ワイヤとしては、金系ワイヤ(高純度金または、それに各種の添加物を添加したもの)のほか、銅系ワイヤ(高純度銅、無酸素銅、または、それに各種の添加物を添加したもの)、パラジウム系ワイヤ(パラジウムを主要な成分とする金属材料)等も、同様に適用できることは言うまでもない。
1 半導体基板部(P型単結晶シリコン基板)
2 素子分離フィールド絶縁膜
3 タングステン・プラグ
4 窒化シリコン・ライナー膜
5 プリ・メタル層間絶縁膜
8 ゲート電極
12 レジスト膜
13 銅配線
14 絶縁性バリア膜
15 プラズマシリコン酸化膜
23 銅埋め込み配線
24 複合絶縁性バリア膜
25 主層間絶縁膜
33 銅埋め込み配線
34 複合絶縁性バリア膜
35 主層間絶縁膜
43 銅埋め込み配線
44 複合絶縁性バリア膜
45 主層間絶縁膜
53 銅埋め込み配線
54 複合絶縁性バリア膜
55 主層間絶縁膜
63 銅埋め込み配線
64 複合絶縁性バリア膜
65 主層間絶縁膜
66 レジスト開口
67 アンダ・バンプ・メタル層(バリア&シード・メタル層)
73 銅埋め込み配線
74 絶縁性バリア膜
75 主層間絶縁膜
83 銅埋め込み配線
84 絶縁性バリア膜
85 主層間絶縁膜
93 銅埋め込み配線
94a、94b 絶縁性バリア膜
95a、95b FSG膜
96a、96b USG膜
101 (パッド下の配線を含む)半導体基板、デバイス・チップ、または半導体ウエハ
101b 他のデバイス・チップ
103 銅埋め込み配線
104a、104b 絶縁性バリア膜
105a、105b FSG膜
106a、106b USG膜
113 タングステン・プラグ
114 SiCN膜
115 金系バンプ電極(金バンプ、表面メタル層、またはオーバ・パッド・メタル)
117 USG膜
118 ボンディング・パッド
119 プラズマSiN(パッド上の無機ファイナル・パッシベーション)
120 ポリイミド塗布膜
121 チタン・バリア膜(バリア・メタル膜)
122 パラジュウム・シード膜(シード・メタル膜)
123 ポリイミド膜開口
124 クロム・バリア膜
125 銅シード膜
126 銅電解メッキ膜
127 ニッケル電解メッキ膜
130 接着剤層(ダイ・アタッチ・フィルム)
131 外部リード(リード)
132 ボンディング・ワイヤ
133 配線基板
134 ボンディング・ボール
135 1次ボンディング部
136 2次ボンディング部
137 半田バンプ
138 半田バンプ用ランド電極
139 ボイド(カーケンダル・ボイド)
140、141、142、143 Au−Al系金属間化合物層
145 ダイ・パッド
146 ダイ・パッド・サポート・バー
148 アンダ・フィル・レジン
151 チタン接着層
152 窒化チタン・バリアメタル層
153 窒化チタン層
155 ランド・パッド
156 半田層
157 金系スタッド・バンプ(金ボンディング・ボール)
163 ボンディング・パッド開口(ボンディング・パッド直上の絶縁膜開口)
171 ボンディング・キャピラリ
181 レジン封止体(封止レジン)
201 パッド開口
202 スパッタ・エッチ
203 チタン・スパッタ
204 Pdスパッタ
205 レジスト塗布
206 露光
207 現像
208 Oアッシング
209 金電解メッキ
210 レジスト除去
211 Oアッシング
212 Pdウエット・エッチ
213 チタン・ウエット・エッチ
214 Oアッシング
215 プローブ検査(ウエハ検査)
216 BG(バック・グラインディング)
217 ダイシング(ペレタイズ)
218 ダイ・ボンディング
219 ワイヤ・ボンディング
221 プローブ針
301 ニッケル層
302 金メッキ領域
303 ニッケル露出領域
AP 最上層配線層(パッド層)
LB 表面メタル層の幅
LP パッドの幅
LW パッド開口の幅
M1 第1配線層
M2 第2配線層
M3 第3配線層
M4 第4配線層
M5 第5配線層
M6 第6配線層
M7 第7配線層
M8 第8配線層
M9 第9配線層
M10 第10配線層
TB 表面メタル層の厚さ
TU バリア・メタル層の厚さ

Claims (20)

  1. 以下を含む半導体集積回路装置:
    (a)半導体チップのデバイス面上に設けられたアルミニウム系または銅系のパッド電極;
    (b)前記パッド電極上に設けられたバリア・メタル膜;
    (c)前記バリア・メタル膜上に設けられた金を主要な成分とする表面金属膜;
    (d)前記表面金属膜上に接合された金または銅を主要な成分とするボンディング・ボールまたはボンディング・ワイヤ。
  2. 前記1項の半導体集積回路装置において、前記表面金属膜の厚さは、前記バリア・メタル膜の厚さよりも厚い。
  3. 前記1項の半導体集積回路装置において、前記表面金属膜は、電解メッキまたはスパッタリングにより形成されたものである。
  4. 前記1項の半導体集積回路装置において、前記表面金属膜は、電解メッキにより形成されたものである。
  5. 前記1項の半導体集積回路装置において、前記表面金属膜の面積は、前記パッド電極上の絶縁膜開口の面積よりも大きい。
  6. 前記5項の半導体集積回路装置において、前記パッド電極の面積は、前記表面金属膜の面積よりも大きい。
  7. 前記1項の半導体集積回路装置において、前記パッド電極上の絶縁膜開口は、平面的に言って、前記表面金属膜の内部にある。
  8. 前記7項の半導体集積回路装置において、前記表面金属膜は、平面的に言って、前記パッド電極の内部にある。
  9. 前記1項の半導体集積回路装置において、前記表面金属膜は、前記パッド電極のない領域にまで延在している。
  10. 前記1項の半導体集積回路装置において、前記ボンディング・ボールは、ボンディング・ワイヤのボール部である。
  11. 前記1項の半導体集積回路装置において、前記ボンディング・ボールは、金を主要な成分とする部材から構成されている。
  12. 前記1項の半導体集積回路装置において、前記ボンディング・ボールは、銅を主要な成分とする部材から構成されている。
  13. 前記1項の半導体集積回路装置において、前記パッド電極は、アルミニウム系のパッド電極である。
  14. 前記1項の半導体集積回路装置において、前記バリア・メタル膜は、チタンを主要な成分とする。
  15. 前記1項の半導体集積回路装置において、前記バリア・メタル膜は、チタン、クロム、窒化チタン、および窒化タングステンからなる群から選択された一つを主要な成分とする。
  16. 前記1項の半導体集積回路装置において、更に以下を含む:
    (e)前記バリア・メタル膜と前記表面金属膜の間に設けられたシード・メタル膜。
  17. 前記16項の半導体集積回路装置において、前記シード・メタル膜は、パラジウムを主要な成分とする。
  18. 前記16項の半導体集積回路装置において、前記シード・メタル膜は、銅、金、ニッケル、白金、ロジウム、モリブデン、タングステン、クロムおよびタンタルからなる群から選択された一つを主要な成分とする。
  19. 前記1項の半導体集積回路装置において、前記パッド電極は、平面的に言って、ほぼ正方形形状を呈している。
  20. 前記1項の半導体集積回路装置において、前記パッド電極は、平面的に言って、ほぼ長方形形状を呈している。
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JP2009188913A JP5331610B2 (ja) 2008-12-03 2009-08-18 半導体集積回路装置
US12/628,869 US8063489B2 (en) 2008-12-03 2009-12-01 Semiconductor integrated circuit device
CN201310725962.9A CN103681595B (zh) 2008-12-03 2009-12-02 半导体集成电路器件
CN200910224397A CN101752334A (zh) 2008-12-03 2009-12-02 半导体集成电路器件
US13/229,887 US9466559B2 (en) 2008-12-03 2011-09-12 Semiconductor integrated circuit device
US13/952,596 US20130313708A1 (en) 2008-12-03 2013-07-27 Semiconductor integrated circuit device
US15/264,222 US10818620B2 (en) 2008-12-03 2016-09-13 Semiconductor integrated circuit device

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