JP2005217071A - マルチチップ半導体装置用チップ及びその製造方法 - Google Patents
マルチチップ半導体装置用チップ及びその製造方法 Download PDFInfo
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- JP2005217071A JP2005217071A JP2004020444A JP2004020444A JP2005217071A JP 2005217071 A JP2005217071 A JP 2005217071A JP 2004020444 A JP2004020444 A JP 2004020444A JP 2004020444 A JP2004020444 A JP 2004020444A JP 2005217071 A JP2005217071 A JP 2005217071A
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Abstract
【解決手段】 一のマルチチップ半導体装置用チップ内に二以上の導電性貫通プラグを有するマルチチップ半導体装置用チップにおいて、前記導電性貫通プラグの一以上をアライメント用マークとし、前記マルチチップ半導体装置用チップの表面及び/又は裏面で前記アライメント用マークが識別できるように構成したことにある。そして、当該導電性貫通プラグの表面及び/又は裏面に絶縁膜を施した。
【選択図】図1
Description
特許文献1に示された方法では、アライメントを行ないながら透過光量を測定することが必須となるので、レーザ等の光源と、その光源からの照射光を受光する受光器と、光源及び受光器をマウントするマウンターが必要となる。アライメント用の貫通孔の直径が小さい場合は、受光器で受光できる受光量が不足し、アライメントができなくなる。逆に、貫通孔の直径が大きい場合は、受光量は十分であるがアライメントの精度が悪くなる。従って、照射光を透過させるための貫通孔の大きさ、光源、受光器の最適化が必要である。しかも、この方法では、光を透過するアライメント用の貫通孔を貫通電極とは別に設けるために専用の追加工程が必要であり、マルチチップモジュールの最上段と最下段の本来貫通孔を設ける必要のないチップにも貫通孔を設けなければならない。
1.フリップチップ、或いはチップ・オン・チップで接合する際に、チップ同士の位置合わせを1μmより高精度で行なうことが可能となる。
2.チップの位置合わせ精度を1μmより高精度で行なうことが可能なので、接合ピッチが狭いチップの位置合わせにも対応できる。
3.チップの接合方法として、フェースダウン、上下撮像、赤外線透過撮像のどの方法でも用いることができる。即ち、チップの接合方法に制約がない。
4.アライメント用マークを形成するための追加工程、例えばチップの裏面にフォトリソグラフィー工程を追加しないで済む。
5.形状や大きさ等の異なるアライメント用マークを有するチップを製作する必要がなく、一貫してアライメント用マークを製作することができる。
6.アライメント用マークを非対称な形状、或いは配置のマークにすることで表面と裏面との検出が可能となる。
7.光透過式のアライメントマークに比べて小さく、またドライエッチングを用いれば貫通孔の径を小さくすることができ、チップ実利用面積を比較的大きくとれる。
(a)基板1の表面のフォトリソグラフィー工程で導電性貫通プラグの貫通孔パターンを露光する。そして、ドライエッチングで貫通孔となるビア2をエッチングする。
(b)作製された深穴のビア2を絶縁膜(図には示されていない。)で被覆し、スパッタによりシード層(図には示されていない。)を形成し、電解メッキによりビア2を導電性物質3により充填する。この場合、充填する金属はCu、Al、Au、W、Ti、Sn、半田等適宜選択することができる。或いは、ビア2の充填に導電性樹脂を用いても良い。
(c)基板1の裏面より研削した後に、ドライエッチ、ドライポリッシュ又はウエットエッチを施して、貫通孔に充填した金属を裏面に露出させ、導電性貫通プラグ6を完成させる。なお、アライメント用マークになる導電性貫通プラグ6’には、メッキバンプ等が付着しても構わないが、絶縁膜を被覆することも可能であって、絶縁膜を被覆した場合には形状精度がさらに正確になって、フォトリソグラフィーの精度を保つことができる。
(d)アライメント用マークにする貫通孔は、その上面及び/又は裏面をカバー絶縁膜4(絶縁膜:SiO2、SiON、SiN等)で覆うことにより、アライメント用マーク5を完成させる。なお、アライメント用マーク5をカバー絶縁膜4で覆うことは必ずしも必須の要件ではなく、カバー膜で覆った場合には、メッキバンプの形成工程に入ってもメッキが付くことはなく、俯瞰して見た場合の形状精度がフォトリソグラフィーの解像度に保たれるという作用を有する。
以上のようにして、マルチチップ半導体装置用チップを得ることができる。
なお、通常の導電性貫通プラグ6にはメッキバンプを形成する必要があるので、カバー絶縁膜4に開口部を設ける。
上述した第一、第二及び第三の実施の形態において、アライメント用マークとした導電性貫通プラグは、その断面形状が他の導電性貫通プラグの最小幅以下としても良い。導電性貫通プラグの充填条件は一般に幅によって異なるが、上記のようにすると他の導電性貫通プラグと同一の工程、同一の条件でアライメント用マークを形成できる。従って、製造工程への負荷を低減できる。
なお、本願発明のアライメント用マークを使用して、チップ間の位置合わせができることを述べてきたが、導電性貫通プラグ上に形成されたメッキバンプを相互接続する配線を形成するためのリソグラフィーのアライメントマークとして、本願発明のアライメント用マークを使用することも可能である。本願発明のアライメント用マークをフォトリソグラフィー用の目合わせマークとして使う場合には、目合わせ精度を考慮して、その最小幅が他の導電性貫通プラグの最小幅以下であり、且つ最小幅が1μm以下であることが望ましい。
(1)ダイマウント
上チップ39及び下チップ40を共にダイシングしておき、ダイシングされた下チップ40はステージの上に、ダイシングされた上チップ39はボンディング装置33のマウントヘッド34に搭載する(S1)。このとき、少なくともどちらかのチップは導電性貫通プラグを有し、裏面のアライメント用マークが見えていることとする。
(2)アライメント用マーク撮像
下チップ40の上面を上側から、上チップ39の下面を下側から、それぞれ別のカメラ36、37で撮像する(S2)。これらのカメラは、次の画像処理が可能であれば、特に種類等は問わない。
(3)画像処理
アライメント用マークを含むチップの一部分を、一チップ上で少なくとも二箇所に亘り画像処理を行ない、チップの中心位置を求める(S3)。図6(a)は、チップの座標(中心位置)を求め終えた状態を示す。
(4)移動
マウンタヘッド34或いはステージ38のXY軸を精密に移動させ、両チップ39、40の位置を正確に一致させる(S4)。図6(b)は、チップを接合位置へ移動した状態を示す。
(5)接合
マウンタヘッド34を垂直に降ろして、上側のチップ39を下側のチップ40に接合する(S5)。このとき、バンプに印加される加重は精密に制御できるように構成されている。図6(c)は、そのように接合した状態を示す。
(6)加熱/圧着/超音波接合
用いるバンプやマウンターの構成によって決まる最適な方法を用いてバンプをチップの間で密着させる(S6)。
(7)マウンタヘッド分離
図6には記載していないが、マウンタヘッド34を上昇させ、分離する(S7)。
この後、さらにチップの積層を続けるときはS1に戻り、3層以上の積層を行なう。チップの積層が終わったら、モジュールをパッケージングする(インタポーザに搭載する)等の一次実装工程に進む。
2 ビア
3 導電性物質
4 ガバー絶縁膜
5 アライメント用マーク
6 導電性貫通プラグ
6’ アライメント用マークになる導電性貫通プラグ
7 マルチチップ半導体装置用チップ
8 導電性貫通プラグ
9 アライメント用マーク(白抜き十字型)
10 アライメント用マーク(十字型)
11 アライメント用マーク(エル・ドット)
12 アライメント用マーク(円形)
13 マルチチップ半導体装置用チップ
14〜16 導電性貫通プラグ
17、18 アライメント用マーク
19、21、23、25、27、29、31 導電性貫通プラグ
20、22、24、26、28、30、32 アライメント用マーク
33 マルチチップ半導体装置用チップのボンディング装置
34 マウントヘッド
35 マウンター
36、37 カメラ
38 ステージ
39 上チップ
40 下チップ
41、42 マルチチップ半導体装置用チップ
43 アライメント用マーク
44 導電性貫通プラグ
45 ウエハ
46 マルチチップ半導体装置用チップ
45〜48 マルチチップ半導体装置用チップ
49〜52 活性面
53 導電性貫通プラグ
54 アライメント用マーク
55 バンプ
56、57 マルチチップ半導体装置用チップ
58 貫通電極スペーサー
59 導電性貫通プラグ
60 アライメント用マーク
61 バンプ
62、63 活性面
64 オプティカルデバイスを搭載するチップ
65 マルチチップ半導体装置用チップ
66 活性面
67 受光・発光素子面
68 導電性貫通電極
69 アライメント用マーク
70 バンプ
71〜73 マルチチップ半導体装置用チップ
74 FCBGA基板
75 半田ボール
76〜78 活性面
79 導電性貫通プラグ
80 アライメント用マーク
81 バンプ
Claims (16)
- 一のマルチチップ半導体装置用チップ内に二以上の導電性貫通プラグを有するマルチチップ半導体装置用チップにおいて、前記導電性貫通プラグの一以上をアライメント用マークとし、前記マルチチップ半導体装置用チップの表面及び/又は裏面で前記アライメント用マークが識別できるように構成して成ることを特徴とするマルチチップ半導体装置用チップ。
- 前記アライメント用マークは、当該アライメント用マークの形状によって識別できるように構成して成ることを特徴とする請求項1記載のマルチチップ半導体装置用チップ。
- 前記アライメント用マークは、当該アライメント用マークが配置される位置と前記導電性プラグが配置される位置との相対関係によって識別できるように構成して成ることを特徴とする請求項1又は請求項2記載のマルチチップ半導体装置用チップ。
- 前記アライメント用マークは、前記マルチチップ半導体装置用チップの表面及び裏面で同形状に設けられていることを特徴とする請求項1乃至請求項3の何れかに記載のマルチチップ半導体装置用チップ。
- 前記アライメント用マークの形状或いはその配列は、非対称であることを特徴とする請求項1乃至請求項4の何れかに記載のマルチチップ半導体装置用チップ。
- 前記アライメント用マークとした導電性貫通プラグは、その断面形状の最小幅が他の導電性貫通プラグの最小幅以下であることを特徴とする請求項1乃至請求項5の何れかに記載のマルチチップ半導体装置用チップ。
- 前記アライメント用マークとした導電性貫通プラグは、その表面及び/又は裏面が絶縁材料で覆われていることを特徴とする請求項1乃至請求項6の何れかに記載のマルチチップ半導体装置用チップ。
- 前記アライメント用マークは、実装用アライメントマークであることを特徴とする請求項1乃至請求項7の何れかに記載のマルチチップ半導体装置用チップ。
- 前記アライメント用マークは、フォトリソグラフィー用の目合わせマークであることを特徴とする請求項1乃至請求項7の何れかに記載のマルチチップ半導体装置用チップ。
- 前記フォトリソグラフィー用の目合わせマークは、その断面形状の最小幅が他の導電性貫通プラグの最小幅以下であり、且つ最小幅が1μm以下であることを特徴とする請求項9記載のマルチチップ半導体装置用チップ。
- 前記アライメント用マークとした導電性貫通プラグの少なくとも1部の電位は固定されていることを特徴とする請求項1乃至請求項10の何れかに記載のマルチチップ半導体装置用チップ。
- 一のマルチチップ半導体装置用チップ内に二以上の導電性貫通プラグを有し且つ前記導電性貫通プラグの一以上をアライメント用マークとしたマルチチップ半導体装置用チップをボンディング装置で積層する際に、前記アライメント用マークにより前記マルチチップ半導体装置用チップの位置を算出するように構成して成ることを特徴とするマルチチップ半導体装置用チップのボンディング装置。
- 一のマルチチップ半導体装置用チップ内に二以上の導電性貫通プラグを有し且つ前記導電性貫通プラグの一以上をアライメント用マークとしたマルチチップ半導体装置用チップをアライメントして積層する際に、前記アライメント用マークにより前記マルチチップ半導体装置用チップのアライメントを行なうことを特徴とするマルチチップ半導体装置用チップのアライメント方法。
- 一のマルチチップ半導体装置用チップに二以上のビアをエッチングする工程と、前記二以上のビアをエッチングする工程で製作された二以上のビアに導電性物質を埋め込む工程と、前記導電性物質を埋め込む工程で導電性物質が埋め込まれた前記マルチチップ半導体装置用チップの裏面を後退させて前記導電性物質を露出させる工程とを含むマルチチップ半導体装置用チップの製造方法であって、前記導電性物質を埋め込んだ導電性貫通プラグの一以上をアライメント用マークとし、前記マルチチップ半導体装置用チップの表面及び/又は裏面で前記アライメント用マークが識別できるようにしたことを特徴とするマルチチップ半導体装置用チップの製造方法。
- 前記導電性物質を埋め込む工程以降に、前記導電性物質を埋め込んだ導電性貫通ビアの一以上の表面及び/又は裏面に絶縁膜を施す工程が含まれることを特徴とする請求項14記載のマルチチップ半導体装置用チップの製造方法。
- 前記ビアに導電性物質を埋め込む方法は、メッキ、スパッタリング、CVD、導電性樹脂塗布、半田・低融点金属の溶融の内から選ばれた一種以上の方法であることを特徴とする請求項14又は請求項15に記載のマルチチップ半導体装置用チップの製造方法。
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Also Published As
Publication number | Publication date |
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CN1649148A (zh) | 2005-08-03 |
US20070004084A1 (en) | 2007-01-04 |
US7122912B2 (en) | 2006-10-17 |
US20050161837A1 (en) | 2005-07-28 |
US7883985B2 (en) | 2011-02-08 |
CN100385665C (zh) | 2008-04-30 |
JP4467318B2 (ja) | 2010-05-26 |
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