JP7228422B2 - 焼結接合用シート、基材付き焼結接合用シート、および焼結接合用材料層付き半導体チップ - Google Patents
焼結接合用シート、基材付き焼結接合用シート、および焼結接合用材料層付き半導体チップ Download PDFInfo
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- JP7228422B2 JP7228422B2 JP2019047964A JP2019047964A JP7228422B2 JP 7228422 B2 JP7228422 B2 JP 7228422B2 JP 2019047964 A JP2019047964 A JP 2019047964A JP 2019047964 A JP2019047964 A JP 2019047964A JP 7228422 B2 JP7228422 B2 JP 7228422B2
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Description
焼結性粒子P1としての銀粒子 56.51質量部と、高分子バインダー(熱分解性高分子バインダー)としてのポリカーボネート樹脂(商品名「QPAC40」,重量平均分子量は150000,常温で固体,Empower Materials社製)0.82質量部と、低分子バインダー(低沸点バインダー)としてのイソボルニルシクロヘキサノール(商品名「テルソルブMTPH」,常温で液体,日本テルペン化学工業株式会社製)3.29質量部と、溶剤としてのメチルエチルケトン 39.38質量部とを、ハイブリッドミキサー(商品名「HM-500」,株式会社キーエンス製)をその撹拌モードで使用して混合し、ワニスを調製した。撹拌時間は3分間とした。焼結性粒子P1としての前記の銀粒子は、第1の銀粒子(平均粒径60nm,DOWAエレクトロニクス株式会社製)と第2の銀粒子(平均粒径1100nm,三井金属鉱業株式会社製)とを質量比9:1で含むものである。そして、得られたワニスを、基材としての離型処理フィルム(商品名「MRA38」,三菱ケミカル株式会社製)に塗布した後に乾燥させて、厚さ54μmの焼結接合用シートを形成した。乾燥温度は110℃とし、乾燥時間は3分間とした。焼結接合用シートにおける焼結性粒子含有割合は93.2質量%である。以上のようにして、焼結性粒子と高分子バインダーと低分子バインダーとを含む実施例1の焼結接合用シートを基材上に作製した。実施例1の焼結接合用シートに関する組成を表1に掲げる(後記の実施例および比較例についても同様である。また、表1において、組成を表す各数値の単位は、相対的な“質量部”である)。
焼結性粒子P1の配合量を56.51質量部に代えて56.35質量部としたこと、ポリカーボネート樹脂(商品名「QPAC40」,Empower Materials社製)の配合量を0.82質量部に代えて1.7質量部としたこと、イソボルニルシクロヘキサノール(商品名「テルソルブMTPH」,日本テルペン化学工業株式会社製)の配合量を3.29質量部に代えて2.55質量部としたこと、およびメチルエチルケトンの使用量を39.38質量部に代えて39.4質量部としたこと、以外は実施例1の焼結接合用シートと同様にして、実施例2の焼結接合用シートを作製した。実施例2の焼結接合用シートにつき、焼結性粒子含有割合は93.2質量%であり、厚さは55μmである。
焼結性粒子P1の配合量を56.51質量部に代えて56.16質量部としたこと、ポリカーボネート樹脂(商品名「QPAC40」,Empower Materials社製)の配合量を0.82質量部に代えて2.63質量部としたこと、イソボルニルシクロヘキサノール(商品名「テルソルブMTPH」,日本テルペン化学工業株式会社製)の配合量を2.55質量部に代えて1.76質量部としたこと、およびメチルエチルケトンの使用量を39.38質量部に代えて39.45質量部としたこと、以外は実施例1の焼結接合用シートと同様にして、実施例3の焼結接合用シートを作製した。実施例3の焼結接合用シートにつき、焼結性粒子含有割合は93.2質量%であり、厚さは52μmである。
焼結性粒子P156.51質量部に代えて焼結性粒子P2としての銅粒子(平均粒径200nm,三井金属鉱業株式会社製)65.74質量部を用いたこと、ポリカーボネート樹脂(商品名「QPAC40」,Empower Materials社製)の配合量を0.82質量部に代えて5.53質量部としたこと、イソボルニルシクロヘキサノール(商品名「テルソルブMTPH」,日本テルペン化学工業株式会社製)の配合量を3.29質量部に代えて3.68質量部としたこと、および、メチルエチルケトンの使用量を39.38質量部に代えて25.05質量部としたこと、以外は実施例1の焼結接合用シートと同様にして、実施例4の焼結接合用シートを作製した。実施例4の焼結接合用シートにつき、焼結性粒子含有割合は87.7質量%であり、厚さは60μmである。
焼結性粒子P1の配合量を56.51質量部に代えて55.78質量部としたこと、ポリカーボネート樹脂(商品名「QPAC40」)の配合量を0.82質量部に代えて4.72質量部としたこと、イソボルニルシクロヘキサノール(商品名「テルソルブMTPH」)を用いなかったこと、および、メチルエチルケトンの使用量を39.38質量部に代えて39.5質量部としたこと、以外は実施例1の焼結接合用シートと同様にして、比較例1の焼結接合用シートを作製した。比較例1の焼結接合用シートにつき、焼結性粒子含有割合は93.2質量%であり、厚さは54μmである。
焼結性粒子P156.51質量部に代えて焼結性粒子P2としての銅粒子(平均粒径200nm,三井金属鉱業株式会社製)64.73質量部を用いたこと、ポリカーボネート樹脂(商品名「QPAC40」)の配合量を0.82質量部に代えて6.15質量部としたこと、イソボルニルシクロヘキサノール(商品名「テルソルブMTPH」,日本テルペン化学工業株式会社製)の配合量を3.29質量部に代えて4.09質量部としたこと、および、メチルエチルケトンの使用量を39.38質量部に代えて25.04質量部としたこと、以外は実施例1の焼結接合用シートと同様にして、比較例2の焼結接合用シートを作製した。比較例2の焼結接合用シートにつき、焼結性粒子含有割合は86.8質量%であり、厚さは65μmである。
実施例1~4および比較例1,2の各焼結接合用シート(片面に基材を伴う)について、次のようにして、転写供給における転写面積比率を調べた。まず、テフロンテープ(商品名「ニトフロン No.900 UL」,厚さ100μm,日東電工株式会社製)上に、基材を伴う焼結接合用シートをその基材側を介して密着させて載置した。焼結接合用シートに伴う基材は、三菱ケミカル株式会社製の「MRA38」(厚さ38μm)である。次に、その焼結接合用シート上に5mm角のシリコンチップ(厚さ200μm)を載せた(載置工程)。このシリコンチップは、その片方のチップ平面側に、シリコンチップ素地上に蒸着法によって形成されたチタン下地膜(厚さ100nm)と、その上に電気めっき法で形成された銀めっき膜(厚さ750nm)とを有する。すなわち、このシリコンチップは、チップ平面として、銀めっき膜のなす銀平面を有する。載置工程では、シリコンチップにおける一方のチップ平面をなす銀平面の側が焼結接合用シートに接する態様で、焼結接合用シート上にシリコンチップを載せた。次に、焼結接合用シート上のシリコンチップに対し、焼結接合用シートに向けての加圧処理を行った(シリコンチップの銀平面に対する焼結接合用シートの加圧処理)。この処理において、荷重は10MPaであり、加圧時間は5秒間であり、加圧温度は70℃(実施例1~3と比較例1)または90℃(実施例4と比較例2)である。このような加圧処理の後、基材付き焼結接合用シートについて剥離作業を行ったところ、実施例1~4の焼結接合用シートでは、シリコンチップないしその銀平面に圧着された箇所が当該チップ上に残り、比較例1,2の焼結接合用シートでは、シリコンチップないしその銀平面に圧着された箇所が当該チップ上に残らなかった。そして、チップ平面ないし銀平面の面積R1と、当該チップ平面に転写されて形成された焼結接合用シート由来の焼結接合用材料層(チップ面に密着している)の面積R2とを、画像解析によって計測した。その画像解析には、3D形状測定用デジタルマイクロスコープ(商品名「VR-3200」,株式会社キーエンス製)と画像解析アプリケーションソフト(商品名「VR-3000 G2」,株式会社キーエンス製)を使用した。焼結接合用シートごとに、チップ平面(銀平面)の面積R1に対する、当該チップ平面に密着している焼結接合用材料層の面積R2の比率を、表1掲げる。
実施例1~4および比較例1,2の各焼結接合用シート(片面に基材を伴う)について、ナノインデンター(商品名「Triboindenter」,Hysitron社製)を使用して、ナノインデンテーション法による荷重-変位測定を行った。測定に供した試料片は、各焼結接合用シートから10mm角のサイズで切り出して用意したものである。本測定において、測定モードは単一押込み測定とし、測定温度は23℃とし、使用圧子はBerkovich(三角錐)型のダイヤモンド圧子とし、荷重印加過程で達する最大荷重(設定値)は500μNとし、荷重印加過程での圧子の押込み速度は100μN/秒とし、除荷過程での圧子の引抜き速度は100μN/秒とした。本測定によって求められた最小荷重f(μN)を表1に掲げる。
実施例1~4および比較例1,2の各焼結接合用シート(片面に基材を伴う)を使用して、転写工程を行った。まず、テフロンテープ(商品名「ニトフロン No.900 UL」,厚さ100μm,日東電工株式会社製)上に、基材(商品名「MRA38」,厚さ38μm,三菱ケミカル株式会社製)を伴う焼結接合用シートをその基材側を介して密着させて載置した。次に、その焼結接合用シート上に、銀めっき付き銅チップ(厚さ500μm,3mm角)を載せた。この銅チップは、焼結接合用シート側の表面に銀めっきが施されて銀めっき膜(厚さ5μm)が形成されたものである。次に、焼結接合用シート上の銅チップに対し、焼結接合用シートに向けての加圧処理を行った。この処理において、荷重は10MPaであり、加圧時間は5秒間であり、加圧温度は70℃(実施例1~3と比較例1)または90℃(実施例4と比較例2)である。このような加圧処理の後、基材付き焼結接合用シートについて剥離作業を行ったところ、実施例1~4の焼結接合用シートでは、銅チップに圧着された箇所が当該チップ上に残り、比較例1,2の焼結接合用シートでは、銅チップに圧着された箇所が当該チップ上に残らなかった。実施例1~4の焼結接合用シートを使用して行う転写工程では、焼結接合用材料層付きチップを得ることができた。
導電性金属含有の焼結性粒子とバインダー成分とを含み、
チップ平面をなす銀平面を有する5mm角のシリコンチップの前記銀平面に対する、温度が70℃または90℃、荷重10MPa、および加圧時間5秒の条件での加圧処理を経て、当該銀平面上に転写される焼結接合用材料層の面積の、前記銀平面の面積に対する比率が、0.75~1である、焼結接合用シート。
〔付記2〕
加熱温度300℃、加圧力10MPa、および加熱時間150秒の焼結条件を経て焼結接合された銀平面に対する23℃でのせん断接合力が50MPa以上である、付記1に記載の焼結接合用シート。
〔付記3〕
加熱温度300℃、加圧力40MPa、および加熱時間300秒の焼結条件を経て焼結接合された銀平面に対する23℃でのせん断接合力が50MPa以上である、付記1に記載の焼結接合用シート。
〔付記4〕
ナノインデンテーション法による荷重-変位測定における除荷過程で達する最小荷重が30~100μNである、付記1から3のいずれか一つに記載の焼結接合用シート。
〔付記5〕
前記バインダー成分は、高分子バインダーおよび/または低分子バインダーを含む、付記1から4のいずれか一つに記載の記載の焼結接合用シート。
〔付記6〕
前記高分子バインダーは、熱分解性高分子バインダーを含む、付記5に記載の焼結接合用シート。
〔付記7〕
前記高分子バインダーの重量平均分子量は10000以上である、付記5または6に記載の焼結接合用シート。
〔付記8〕
前記高分子バインダーは、ポリカーボネート樹脂および/またはアクリル樹脂を含む、付記5から7のいずれか一つに記載の焼結接合用シート。
〔付記9〕
前記低分子バインダーは、前記高分子バインダーの熱分解開始温度よりも沸点が低い低沸点バインダーを含む、付記5から8のいずれか一つに記載の焼結接合用シート。
〔付記10〕
前記焼結性粒子は、銀粒子、銅粒子、酸化銀粒子、および酸化銅粒子からなる群より選択される少なくとも一種を含む、付記1から9のいずれか一つに記載の焼結接合用シート。
〔付記11〕
前記焼結性粒子の含有割合が60~99質量%である、付記1から10のいずれか一つに記載の焼結接合用シート。
〔付記12〕
基材と、付記1から11のいずれか一つに記載の焼結接合用シートと、を含む積層構造を有する基材付き焼結接合用シート。
〔付記13〕
焼結接合予定箇所を有する半導体チップと、
前記焼結接合予定面上の、付記1から12のいずれか一つに記載の焼結接合用シート由来の焼結接合用材料層と、を備え、
前記焼結接合予定面の面積に対する前記焼結接合用材料層の面積の比率が0.75~1である、焼結接合用材料層付き半導体チップ。
Y 焼結接合用材料層付きチップ
B 基材
10 焼結接合用シート
11 焼結接合用材料層
12 焼結層
T1,T2 加工用テープ
C チップ(半導体チップ)
S 支持基板(基板)
Claims (5)
- 基材と、焼結接合用シートと、を含む積層構造を有する基材付き焼結接合用シートであって、
前記基材は、離型処理フィルムであり、
前記焼結接合用シートは、導電性金属含有の焼結性粒子とバインダー成分とを含み、
前記導電性金属は、銀又は銅であり、
前記バインダー成分は、高分子バインダーと低分子バインダーとを含み、
前記高分子バインダーは、ポリカーボネート樹脂を含み、
前記低分子バインダーは、テルペンアルコール類を含み、
前記焼結接合用シートに含まれる前記高分子バインダーの含有割合は、0.1~55300/7495質量%であり、
前記焼結接合用シートに含まれる前記低分子バインダーの含有割合は、1~32900/6062質量%であり、
前記焼結接合用シートに含まれる前記焼結性粒子の含有割合は、60~99質量%であり、
チップ平面をなす銀平面を有する5mm角のシリコンチップの前記銀平面に対する、温度が、前記導電性金属が銀の場合は70℃または前記導電性金属が銅の場合は90℃、荷重10MPa、および加圧時間5秒の条件での加圧処理を経て、当該銀平面上に転写される焼結接合用材料層の面積の、前記銀平面の面積に対する比率が、0.75~1である、基材付き焼結接合用シート。 - 前記導電性金属が銀であり、
加熱温度300℃、加圧力10MPa、および加熱時間150秒の焼結条件を経て焼結接合された銀平面に対する23℃でのせん断接合力が50MPa以上である、請求項1に記載の基材付き焼結接合用シート。 - 前記導電性金属が銅であり、
加熱温度300℃、加圧力40MPa、および加熱時間300秒の焼結条件を経て焼結接合された銀平面に対する23℃でのせん断接合力が50MPa以上である、請求項1に記載の基材付き焼結接合用シート。 - 前記焼結接合用シートのナノインデンテーション法による荷重-変位測定における除荷過程で達する最小荷重は、30~100μNである、請求項1から3のいずれか一つに記載の基材付き焼結接合用シート。
- 焼結接合予定面を有する半導体チップと、
前記焼結接合予定面上の、請求項1から4のいずれか一つに記載の基材付き焼結接合用シート由来の焼結接合用材料層と、を備え、
前記焼結接合予定面の面積に対する前記焼結接合用材料層の面積の比率が0.75~1である、焼結接合用材料層付き半導体チップ。
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EP20162358.4A EP3709347A1 (en) | 2019-03-15 | 2020-03-11 | Sheet for sintering bonding with base material and semiconductor chip with layer for sintering bonding derived therefrom |
CN202010170995.1A CN111690339A (zh) | 2019-03-15 | 2020-03-12 | 烧结接合用片、带基材的烧结接合用片、以及带烧结接合用材料层的半导体芯片 |
US16/818,323 US20200294952A1 (en) | 2019-03-15 | 2020-03-13 | Sheet for sintering bonding, sheet for sintering bonding with base material, and semiconductor chip with layer of material for sintering bonding |
TW109108353A TW202039139A (zh) | 2019-03-15 | 2020-03-13 | 燒結接合用片材、附有基材之燒結接合用片材、及附有燒結接合用材料層之半導體晶片 |
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EP3709347A1 (en) | 2020-09-16 |
CN111690339A (zh) | 2020-09-22 |
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