JP4800585B2 - 貫通電極の製造方法、シリコンスペーサーの製造方法 - Google Patents
貫通電極の製造方法、シリコンスペーサーの製造方法 Download PDFInfo
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Description
H.Yonemura他4名、「Time−Modulated Cu−Plating Technique for Fabricating High−Aspect−Ratio Vias for Three−Dimensional Stacked LSI System」、2002年、Proceedings of the International Interconnect Technology Conference p.75−77
さらに本発明によれば、貫通電極を形成する前記工程は、前記シリコン基板の一方の面に孔を設ける工程と、前記面および前記孔の内壁を覆う絶縁膜を形成する工程と、前記孔を埋め込むように導電膜を形成する工程と、前記導電膜を研磨またはエッチバックし、前記孔の外部に形成された前記導電膜を除去して前記絶縁膜を露出させるとともに前記孔に埋め込まれた前記導電膜の表面を前記面よりも前記シリコン基板の内部側に後退させて、導電プラグおよびリセス部を形成する工程と、前記導電プラグの後退面から金属膜を成長させ、前記リセス部を埋設するとともに前記孔の外部において拡径した形状のバンプを形成する工程と、前記シリコン基板の他方の面を研磨して前記導電プラグを露出させ、貫通電極を形成する工程と、を含み、前記導電プラグおよびリセス部を形成する工程において、前記導電膜の表面を前記シリコン基板の表面の内部まで後退させ、バンプを形成する前記工程は、前記導電プラグの表面および前記リセス部の側面にバリアメタル膜を形成し、前記バリアメタル膜を起点として前記金属膜を成長させる工程を有している。
シリコンスペーサー100では、シリコン基板101の貫通孔に充填された貫通プラグ107の表面がシリコン基板101と絶縁性厚膜103との界面よりも貫通孔内部側に位置し、第一のバンプ111および絶縁性厚膜103の接触面と貫通プラグ107の上面との間に段差113が形成されている。また、第一のバンプ111の一部が貫通孔の内部に埋設されている。そして、第一のバンプ111は貫通孔の外部において拡径し、庇状に張り出した形状を有する。
本実施例では、図1に示したシリコンスペーサー100を図2(a)〜図2(c)、図3(d)〜図3(f)、図4(g)〜図4(h)、および図5(i)を用いて前述したプロセスにより作製した。なお、絶縁性厚膜103は、厚さ300nmのSiO2膜とした。また、SiN膜105は、厚さ50nmの膜とした。貫通プラグ107はCu膜とした。また、裏面研削後のシリコン基板101の厚さは200μmとした。貫通電極102を有するシリコンスペーサー100は製造安定性が高く、良好な歩留まりで得ることができた。
本比較例では、通常行われるプロセスにより貫通電極を有するシリコンスペーサーを作製した。図8は、本比較例で作製したシリコンスペーサーの構成を模式的に示す断面図である。また、図9(a)〜図9(c)、図10(d)〜図10(f)、および図11(g)〜図11(h)は、図8に示したシリコンスペーサー200の製造工程を説明する断面図である。以下、実施例と異なる点を中心に本比較例で作製したシリコンスペーサーの作製手順を説明する。
11 スペーサー
60 半導体装置
61 基板
65 ボンディングワイヤ
67 ボンディングワイヤ
71 チップ
72 チップ
73 チップ
100 シリコンスペーサー
101 シリコン基板
102 貫通電極
103 絶縁性厚膜
105 SiN膜
107 貫通プラグ
109 アンダーバンプメタル膜
111 第一のバンプ
113 段差
115 第二のバンプ
117 開口部
119 Cu膜
120 接着材
121 レジスト膜
122 剥離層
123 開口部
125 支持体
131 凹部
200 シリコンスペーサー
201 シリコン基板
203 絶縁膜
204 絶縁膜
205 SiN膜
206 絶縁膜
207 貫通プラグ
210 Cuポスト
211 バンプ
215 バンプ
219 Cu膜
225 支持体
Claims (5)
- シリコン基板の一方の面に孔を設ける工程と、
前記面および前記孔の内壁を覆う絶縁膜を形成する工程と、
前記孔を埋め込むように導電膜を形成する工程と、
前記導電膜を研磨またはエッチバックし、前記孔の外部に形成された前記導電膜を除去して前記絶縁膜を露出させるとともに前記孔に埋め込まれた前記導電膜の表面を前記面よりも前記シリコン基板の内部側に後退させて、導電プラグおよびリセス部を形成する工程と、
前記導電プラグの後退面から金属膜を成長させ、前記リセス部を埋設するとともに前記孔の外部において拡径した形状のバンプを形成する工程と、
前記シリコン基板の他方の面を研磨して前記導電プラグを露出させ、貫通電極を形成する工程と、
を含み、
前記導電プラグおよびリセス部を形成する工程において、前記導電膜の表面を前記シリコン基板の表面の内部まで後退させ、
前記バンプを形成する前記工程は、前記導電プラグの表面および前記リセス部の側面にバリアメタル膜を形成し、前記バリアメタル膜を起点として前記金属膜を成長させる工程を有することを特徴とする貫通電極の製造方法。 - 請求項1に記載の貫通電極の製造方法において、
導電プラグを形成する前記工程の後、
前記一方の面の反対側の前記他方の面から前記シリコン基板を選択的に除去し、前記導電プラグの表面を露出させる工程と、
露出した前記導電プラグの表面から別の金属膜を成長させ、裏面側バンプを形成する工程と、
を含むことを特徴とする貫通電極の製造方法。 - 請求項1または2に記載の貫通電極の製造方法において、絶縁膜を形成する前記工程は、前記シリコン基板の前記一方の面にシリコン酸化膜を形成する工程を含むことを特徴とする貫通電極の製造方法。
- 請求項1乃至3のいずれか一項に記載の貫通電極の製造方法において、絶縁膜を形成する前記工程の後、導電膜を形成する前記工程の前に、前記孔の設けられた前記シリコン基板の前記一方の面にバリア膜を形成する工程を含むことを特徴とする貫通電極の製造方法。
- シリコン基板に、請求項1乃至4いずれか一項に記載の貫通電極の製造方法により貫通電極を形成する工程を含むことを特徴とするシリコンスペーサーの製造方法。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004099681A JP4800585B2 (ja) | 2004-03-30 | 2004-03-30 | 貫通電極の製造方法、シリコンスペーサーの製造方法 |
| CNB2005100625051A CN100468712C (zh) | 2004-03-30 | 2005-03-30 | 穿通电极、设有穿通电极的隔片及其制造方法 |
| US11/092,703 US20050218497A1 (en) | 2004-03-30 | 2005-03-30 | Through electrode, spacer provided with the through electrode, and method of manufacturing the same |
| US11/765,696 US7994048B2 (en) | 2004-03-30 | 2007-06-20 | Method of manufacturing a through electrode |
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| JP2004099681A JP4800585B2 (ja) | 2004-03-30 | 2004-03-30 | 貫通電極の製造方法、シリコンスペーサーの製造方法 |
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| JP2005286184A JP2005286184A (ja) | 2005-10-13 |
| JP4800585B2 true JP4800585B2 (ja) | 2011-10-26 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI254995B (en) * | 2004-01-30 | 2006-05-11 | Phoenix Prec Technology Corp | Presolder structure formed on semiconductor package substrate and method for fabricating the same |
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| US7994048B2 (en) | 2011-08-09 |
| US20050218497A1 (en) | 2005-10-06 |
| US20070243706A1 (en) | 2007-10-18 |
| CN100468712C (zh) | 2009-03-11 |
| JP2005286184A (ja) | 2005-10-13 |
| CN1677659A (zh) | 2005-10-05 |
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