JP2006190850A - 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 Download PDFInfo
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Abstract
【解決手段】 半導体チップ1とCu合金製のダイパッド4との間に応力緩衝板8を配置し、半導体チップ1と応力緩衝板8とを、および応力緩衝板8とダイパッド4とを、固相温度270℃以上で液相温度が400℃以下のSn−Sb−Ag−Cuを主要構成元素とする鉛フリー半田の接合材10,9で接合することにより、チップ割れを発生させることなく、鉛フリー半田を用いてダイボンディングを行うことができる。
【選択図】 図2
Description
図1は本発明の実施の形態の半導体装置の内部構造の一例を封止体を透過して示す平面図、図2は図1に示すA−A線に沿って切断した断面の断面図、図3は本発明の実施の形態の半導体装置の組み立てに用いられるリードフレームの構造の一例を示す図であり、(a)は部分平面図、(b)は(a)のA−A線に沿って切断した断面の部分断面図、図4は本発明の実施の形態の半導体装置の組み立て手順の一例を示す製造プロセスフロー図、図5は本発明の実施の形態の半導体装置に組み込まれる応力緩衝板と半田をパラメータとした半導体装置の評価結果の一例を示す結果データ図、図6は本発明の実施の形態の半導体装置の変形例であるトランジスタの内部構造を封止体を透過して示す平面図、図7は図6に示すA−A線に沿って切断した断面の断面図、図8は変形例の半導体装置の構造を示す部分断面図、図9は図8に示す半導体装置の構造を示す平面図、図10は変形例の半導体装置の構造を示す部分断面図、図11は図10に示すA−A線に沿って切断した断面の断面図、図12は変形例の半導体装置の構造を示す部分断面図、図13は変形例の半導体装置の構造を示す部分断面図、図14はBi−Ag−Sb系合金の固相・液相温度の評価結果の一例を示すデータ図、図15はSn−Sb−Ag−Cu系合金の固相・液相温度の評価結果の一例を示す結果図、図16はBi−Ag系合金の2元状態図の一例を示す状態図、図17は本実施の形態の半導体装置の変形例であるトランジスタの構造を示す断面図、図18は本実施の形態の変形例の半導体装置の裏面側の構造を示す裏面図、図19は図18に示すB−B線に沿って切断した断面の断面図である。
1a,21a,41a,51a,61a,71a,117a,133a,146a 主面
1b,21b,41b,51b,61b,71b,117b,133b,146b 裏面
2,22 主電極
3,23 制御電極
4,25,43,53,63,73,101,131,141,142,143 ダイパッド
5,26 第3リード
6,27 第1リード
7,28 第2リード
8,109,134,147 応力緩衝板(応力緩衝手段)
9,10,47,55,68,78 接合材
11,31,125,139,145 封止体
12,13,32,33,121,122,150 Alワイヤ
14,34,48,56,69,79,126,140 パワー半導体パッケージ(半導体装置)
15,24,42,52,62,72 電極
29 Agめっき膜(応力緩衝手段)
30 Bi−Ag−Sb合金(接合材)
44 低熱膨張部材(応力緩衝手段)
45,46,66,67 Niめっき膜
54 空隙部(応力緩衝手段)
64,74 溝部(応力緩衝手段)
65,75 Agめっき膜
100 リードフレーム
102,132,144 リード
103,104 吊りリード
105 フレーム部
106,114 ディスペンサ
107,115 半田ペースト
108,116 溶融半田
110,118 コレット
111 吸引
112,119 スクラブ
113,120 半田接合
123 ボンディングツール
124 超音波振動
133c,133d 電極
135,136,137,138 Sn−35Sb−11Ag−9Cu半田
146c,146d 電極
148,149 Sn−Sb−Ag−Cu半田
151 マルチチップパッケージ(半導体装置)
Claims (17)
- 主面と、その反対側の裏面と、前記主面に形成された電極と、前記裏面に形成された電極と、前記主面に形成された回路とを備えた半導体素子と、
前記半導体素子の前記裏面の電極と接合する導電性のダイパッドと、
前記半導体素子の前記主面の電極と電気的に接続する導電性のリードと、
前記半導体素子と前記ダイパッドと前記リードの一部を封止する封止体と、
前記半導体素子と前記ダイパッドの間に配置され、かつ前記ダイパッドを形成する主材料より低熱膨張、低降伏応力または低弾性率の応力緩衝手段とを有し、
前記半導体素子と前記応力緩衝手段とが、固相温度270℃以上で液相温度が400℃以下のSn−Sb−Ag−Cuを主要構成元素とする合金、またはBi−Ag−Sbを主要構成元素とする合金のいずれかの接合材によって接合されていることを特徴とする半導体装置。 - 請求項1記載の半導体装置において、前記ダイパッドおよび前記リードを形成する前記主材料はCu合金であることを特徴とする半導体装置。
- 請求項2記載の半導体装置において、前記応力緩衝手段は、熱膨張率が8〜12ppm/Kの複合材からなる薄板であることを特徴とする半導体装置。
- 請求項1記載の半導体装置において、前記応力緩衝手段は、前記ダイパッドの素子搭載領域上に配置されたAgめっき膜であることを特徴とする半導体装置。
- 請求項1記載の半導体装置において、前記応力緩衝手段は、前記ダイパッドの素子搭載領域の内部に形成された複数の空隙部であることを特徴とする半導体装置。
- 請求項1記載の半導体装置において、前記応力緩衝手段は、縦と横の平面寸法が前記半導体素子より大きく、かつ前記ダイパッドより小さい薄板であることを特徴とする半導体装置。
- 請求項1記載の半導体装置において、前記Sn−Sb−Ag−Cuを主要構成元素とする合金は、43wt%≦Sb/(Sn+Sb)≦48wt%で15wt%≦(Ag+Cu)≦25wt%の条件を満たす組成となっており、さらに前記Bi−Ag−Sbを主要構成元素とする合金は、5wt%≦Ag/(Bi+Ag)≦25wt%で5wt%≦Sb≦20wt%の条件を満たす組成となっていることを特徴とする半導体装置。
- 請求項1記載の半導体装置において、前記半導体素子の前記主面にはトランジスタ素子の回路が形成されていることを特徴とする半導体装置。
- 請求項1記載の半導体装置において、前記半導体素子が複数個組み込まれていることを特徴とする半導体装置。
- 縦型の半導体素子と、前記半導体素子の裏面の電極に接合するCu合金のダイパッドと、前記半導体素子の回路側の主電極に電気的に接続されるCu合金の第1リードと、前記半導体素子の回路側の制御電極に電気的に接続されるCu合金の第2リードと、前記半導体素子と前記ダイパッドと前記第1および第2リードの一部を覆う樹脂製の封止体とを有する半導体装置であって、
前記ダイパッドと前記半導体素子の間に前記Cu合金より低熱膨張、低降伏応力または低弾性率の応力緩衝手段が配置され、前記半導体素子と前記応力緩衝手段とが、固相温度270℃以上で液相温度が400℃以下のSn−Sb−Ag−Cuを主要構成元素とする合金、またはBi−Ag−Sbを主要構成元素とする合金のいずれかの接合材によって接合されていることを特徴とする半導体装置。 - 請求項10記載の半導体装置において、前記応力緩衝手段は、熱膨張率が8〜12ppm/Kの複合材からなる薄板であることを特徴とする半導体装置。
- 請求項10記載の半導体装置において、前記応力緩衝手段は、前記ダイパッドの素子搭載領域上に配置されたAgめっき膜であることを特徴とする半導体装置。
- 請求項10記載の半導体装置において、前記応力緩衝手段は、前記ダイパッドの素子搭載領域の内部に形成された複数の空隙部であることを特徴とする半導体装置。
- 請求項10記載の半導体装置において、前記応力緩衝手段は、縦と横の平面寸法が前記半導体素子より大きく、かつ前記ダイパッドより小さい薄板であることを特徴とする半導体装置。
- 請求項10記載の半導体装置において、前記Sn−Sb−Ag−Cuを主要構成元素とする合金は、43wt%≦Sb/(Sn+Sb)≦48wt%で15wt%≦(Ag+Cu)≦25wt%の条件を満たす組成となっており、さらに前記Bi−Ag−Sbを主要構成元素とする合金は、5wt%≦Ag/(Bi+Ag)≦25wt%で5wt%≦Sb≦20wt%の条件を満たす組成となっていることを特徴とする半導体装置。
- 半導体素子と、前記半導体素子の裏面の電極に接合するCu合金のダイパッドと、前記半導体素子の電極に電気的に接続されるCu合金のリードと、前記半導体素子と前記ダイパッドと前記リードの一部を覆う樹脂製の封止体とを有する半導体装置の製造方法であって、
(a)前記ダイパッドと前記リードを有するリードフレームを準備する工程と、
(b)前記リードフレームの前記ダイパッド上にペースト状または粒状からなりかつ鉛を含まない半田を供給して溶融させる工程と、
(c)前記半田の上に前記Cu合金より低熱膨張、低降伏応力または低弾性率の応力緩衝板を配置し、その後、前記応力緩衝板の加圧とスクラブを行って前記応力緩衝板を固着する工程と、
(d)前記応力緩衝板の上にペースト状または粒状からなりかつ鉛を含まない半田を供給して溶融させる工程と、
(e)前記(d)工程で供給された前記半田の上に前記半導体素子を配置し、その後、前記半導体素子の加圧とスクラブを行って前記半導体素子を固着する工程と、
(f)前記半導体素子の前記電極と前記リードフレームの前記リードとを電気的に接続する工程と、
(g)前記半導体素子、前記ダイパッドおよび前記リードの一部を覆うように樹脂モールドを行って前記封止体を形成する工程と、
(h)前記封止体から突出する前記リードを前記リードフレームから切断分離する工程とを有することを特徴とする半導体装置の製造方法。 - 請求項16記載の半導体装置の製造方法において、前記鉛を含まない半田として、固相温度270℃以上で液相温度が400℃以下のSn−Sb−Ag−Cuを主要構成元素とする合金、またはBi−Ag−Sbを主要構成元素とする合金のいずれかの接合材を用いることを特徴とする半導体装置の製造方法。
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| US11/324,315 US7528489B2 (en) | 2005-01-07 | 2006-01-04 | Semiconductor apparatus and manufacturing method |
| CNB2006100057109A CN100481428C (zh) | 2005-01-07 | 2006-01-06 | 半导体器件及其制造方法 |
| KR1020060001750A KR100684240B1 (ko) | 2005-01-07 | 2006-01-06 | 반도체 장치 및 그 제조 방법 |
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| CN1812083A (zh) | 2006-08-02 |
| KR20060081368A (ko) | 2006-07-12 |
| CN100481428C (zh) | 2009-04-22 |
| US20060151889A1 (en) | 2006-07-13 |
| JP4343117B2 (ja) | 2009-10-14 |
| US7528489B2 (en) | 2009-05-05 |
| KR100684240B1 (ko) | 2007-02-22 |
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