JP6531603B2 - 電子部品、電子装置及び電子装置の製造方法 - Google Patents
電子部品、電子装置及び電子装置の製造方法 Download PDFInfo
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- JP6531603B2 JP6531603B2 JP2015195748A JP2015195748A JP6531603B2 JP 6531603 B2 JP6531603 B2 JP 6531603B2 JP 2015195748 A JP2015195748 A JP 2015195748A JP 2015195748 A JP2015195748 A JP 2015195748A JP 6531603 B2 JP6531603 B2 JP 6531603B2
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Description
電子部品間の接合不良は、それら電子部品を含む電子装置の性能及び品質を低下させる恐れがある。
開示の技術によれば、積層時の接合不良が抑えられる電子部品を実現することが可能になり、また、接合不良が抑えられた電子部品群を含む高性能及び高品質の電子装置を実現することが可能になる。
図1は電子部品の積層構造の一例を示す図である。図1には、積層構造の一例の要部断面を模式的に図示している。
図2は半導体チップ積層工程の一例を示す図である。図2(A)及び図2(B)には、積層工程の一例の要部断面を模式的に図示している。
基板250は、積層される半導体チップ260の端子262に対応する位置に、端子252(電極)を備える。
半導体チップ270は、例えば、その本体部271の一面(表面)271a側に、ピラー電極272aとその先端に設けられた半田272bとを含む端子272を備える。端子272は、本体部271内の回路素子に電気的に接続される。半導体チップ270の端子272は、半導体チップ260の端子263に対応する位置に設けられる。
また、ここでは、まず基板250上に半導体チップ260を積層し、次いで半導体チップ260上に半導体チップ270を積層するようにしたが、半導体チップ260上に半導体チップ270等を積層した後、その積層体を基板250上に積層することもできる。
以上のような点に鑑み、ここでは、以下に実施の形態として示すような手法を採用し、積層される電子部品間の接合不良を抑える。
図3は第1の実施の形態に係る電子部品の一例を示す図である。図3には、第1の実施の形態に係る電子部品の一例の要部断面を模式的に図示している。
電子部品10は、半導体チップ、半導体チップを含む半導体パッケージ(半導体装置)、回路基板等である。電子部品10は、個片化されたものでもよいし、個片化される前のものでもよい。基板11は、半導体チップ、半導体パッケージ、回路基板等の電子部品10の本体部である。
上記のような構成を有する電子部品10では、端子13側に別の電子部品が積層される際、端子12(半田12b)の合金化、それに起因した接合不良が抑えられる。この点について、次の図4を参照して説明する。
ここでは、電子部品に半導体チップを用いた例を、第2の実施の形態として説明する。
図6は第2の実施の形態に係る半導体チップの一例を示す図である。図6には、第2の実施の形態に係る半導体チップの一例の要部断面を模式的に図示している。
半導体基板41は、シリコン(Si)等の半導体基板である。半導体基板41の一方の面(表面(回路面))41a側には、図示しないトランジスタ、抵抗、容量等の回路素子が設けられる。
尚、図7は第2の実施の形態に係る半導体チップの別例を示す図である。図7(A)及び図7(B)には、第2の実施の形態に係る半導体チップの別例の要部断面を模式的に図示している。
図8〜図13は第2の実施の形態に係る半導体チップの形成方法の一例を示す図である。図8〜図13には、第2の実施の形態に係る半導体チップの形成工程の要部断面を模式的に図示している。
次いで、図10(B)に示すように、絶縁層42ab上に、その開口部42acとそれに連通する中空部42cとが覆われるように、所定の絶縁材料が用いられてキャップ膜42ad(上記絶縁部42aの一部)が形成される。
次いで、図11(A)に示すように、シード層43aaが形成される。例えば、シード層43aaとして、チタン(Ti)及びCuが、それぞれ所定の膜厚で、形成される。更に、図11(A)に示すように、中空部42cの少なくとも一部の上方に開口部48aを有するレジスト48が形成される。レジスト48の開口部48aの径は、形成する端子43の径、及び中空部42cの平面サイズ(端子43の径と中空部42cの平面サイズとの関係)に基づいて設定される。
次いで、図12(B)に示すように、ウェットバックによって半田43bが加熱、溶融され、ピラー電極43a上に丸みを帯びた形状の半田43bを備える端子43が形成される。
尚、上記図8〜図13に示す半導体チップ40の形成方法は一例であって、半導体チップ40の形成方法は、ここに例示したものには限定されない。
図14及び図15は第2の実施の形態に係る半導体チップ積層工程の一例を示す図である。図14(A)及び図14(B)並びに図15(A)及び図15(B)には、第2の実施の形態に係る半導体チップ積層工程の一例の要部断面を模式的に図示している。
尚、図16は第2の実施の形態に係る電子装置の別例を示す図である。図16には、第2の実施の形態に係る電子装置の別例の要部断面を模式的に図示している。
尚、積層される半導体チップや電子部品(上記の半導体チップ40,50や電子部品60等)はそれぞれ、個片化後のものでもよいし、個片化前のものでもよい。即ち、積層される半導体チップや電子部品は、Chip On Chip(COC)の形態でもよいし、Wafer On Wafer(WOW)の形態でもよいし、Chip On Wafer(COW)の形態でもよい。
第2の実施の形態に係るシミュレーションに用いた解析モデルを図17に示す。
図18は第3の実施の形態に係る半導体チップの一例を示す図である。図18(A)〜図18(C)にはそれぞれ、第3の実施の形態に係る半導体チップの一例の要部平面レイアウトを模式的に図示している。
中空部42cの平面サイズ及び形状は、例えば、上記第2の実施の形態で述べた図8(B)の工程で絶縁層42aa上に形成する犠牲層47の平面サイズ及び形状によって、調節することができる。その他の工程は、上記第2の実施の形態で述べたのと同様に行うことができる。
図19は第4の実施の形態に係る半導体チップの一例を示す図である。図19(A)〜図19(C)にはそれぞれ、第4の実施の形態に係る半導体チップの一例の要部断面を模式的に図示している。
図20及び図21はそれぞれ第5の実施の形態に係る電子装置の一例を示す図である。図20及び図21にはそれぞれ、第5の実施の形態に係る電子装置の一例の要部断面を模式的に図示している。
次に、第6の実施の形態について説明する。
図22に示す半導体チップ40hは、配線層42の絶縁部42a内に設けられる、比較的熱伝導率の低くなる部位として、気泡42haを含んだ気泡含有部42hが設けられている点で、上記第2の実施の形態に係る半導体チップ40と相違する。
気泡含有部42hを設ける場合は、上記第2の実施の形態で述べた図8(B)の工程で、犠牲層47に替えて、気泡含有部42hを形成する。例えば、気泡含有部42hとして、フェノール系の発泡型樹脂層を形成する。その後、図8(C)の工程の例に従って絶縁層42abを形成し、そこに開口部42acを形成することなく、図10(B)以降の工程を実施する。これにより、気泡含有部42hを備える半導体チップ40hを得ることができる。
図23は第7の実施の形態に係る半導体チップの一例を示す図である。図23には、第7の実施の形態に係る半導体チップの一例の要部断面を模式的に図示している。
図24は第7の実施の形態に係る半導体チップ積層工程の一例を示す図である。図24には、第7の実施の形態に係る半導体チップ積層工程の一例の要部断面を模式的に図示している。
尚、上記第1の実施の形態で述べた電子部品10,20,30、並びに、第3〜第6の実施の形態で述べた電子部品60及び半導体チップ40a,40b,40c,40d,40e,40f,40h,50,90,100に、第7の実施の形態で述べた端子構造を採用してもよい。
図25は半導体チップの構成例を示す図である。図25には、半導体チップの一例の要部断面を模式的に図示している。
半導体基板310には、Si、ゲルマニウム(Ge)、シリコンゲルマニウム(SiGe)等の基板のほか、ガリウムヒ素(GaAs)、インジウムリン(InP)等の基板が用いられる。このような半導体基板310に、トランジスタ、容量、抵抗等の電子素子が設けられる。図25には一例として、MOS(Metal Oxide Semiconductor)トランジスタ330を図示している。
また、以上、第1〜第7の実施の形態で述べた、比較的熱伝導率の低い部位14、中空部42c、気泡含有部42hは、半導体チップのほか、半導体パッケージや回路基板にも適用することができる。
図26(A)に示す半導体パッケージ400A、図26(B)に示す半導体パッケージ400Bは、パッケージ基板410と、パッケージ基板410上に搭載された半導体チップ420と、半導体チップ420を封止する封止層430とを有する。
また、半導体パッケージ410A及び半導体パッケージ410Bのパッケージ基板410上には、同種又は異種の複数の半導体チップ420が搭載されてもよく、また、半導体チップ420のほか、チップコンデンサ等の他の電子部品が搭載されてもよい。
図27に示す半導体パッケージ500は、樹脂層510と、樹脂層510に埋設された同種又は異種の複数(ここでは一例として2つ)の半導体チップ520と、樹脂層510の表面510aに設けられた配線層530(再配線層)とを有する。半導体パッケージ500は、擬似SoC(System on a Chip)等とも称される。
また、半導体パッケージ500の樹脂層510には、1つの半導体チップ520、或いは同種又は異種の3つ以上の半導体チップ520が埋設されてもよく、また、半導体チップ520のほか、チップコンデンサ等の他の電子部品が埋設されてもよい。
図28には、回路基板600として、複数の配線層を含む多層プリント基板を例示している。回路基板600は、Cu等の導体部611(配線、ビア、パッド)と、導体部611を覆う樹脂材料等の絶縁部612とを有する。絶縁部612から露出する導体部611の一部がパッド611aとして用いられる。
また、多層プリント基板のほか、コア基板の表裏面に配線パターン及び絶縁層を積層するビルドアップ基板、コア基板にSi基板、有機基板、ガラス基板を用いるインターポーザでも、この回路基板600と同様に、上記のような部位620を採用することが可能である。
(付記1) 第1熱伝導率を有する第1部位を含む基板と、
前記第1部位内に設けられ、前記第1熱伝導率よりも低い第2熱伝導率を有する第2部位と、
前記基板の第1面側に、前記第2部位に対応して設けられた第1端子と、
前記基板の、前記第1面とは反対の第2面側に設けられた第2端子と
を含むことを特徴とする電子部品。
(付記3) 前記基板は、前記第2部位と前記第1端子との間に設けられ前記第2部位を覆う絶縁層を含むことを特徴とする付記1又は2に記載の電子部品。
(付記5) 第1熱伝導率を有する第1部位を含み、前記第1部位内に前記第1熱伝導率よりも低い第2熱伝導率を有する第2部位が設けられた基板を形成する工程と、
前記基板の第1面側に、前記第2部位に対応して第1端子を形成する工程と、
前記基板の、前記第1面とは反対の第2面側に第2端子を形成する工程と
を含むことを特徴とする電子部品の製造方法。
内部に犠牲層が設けられ前記犠牲層の一部に通じる開口部を有する前記第1部位を含む第1基板を形成する工程と、
前記開口部から前記犠牲層を除去することによって前記第1部位内に前記第2部位を形成する工程と
を含むことを特徴とする付記5に記載の電子部品の製造方法。
(付記8) 第1熱伝導率を有する第1部位を含む第1基板と、
前記第1部位内に設けられ、前記第1熱伝導率よりも低い第2熱伝導率を有する第2部位と、
前記第1基板の第1面側に、前記第2部位に対応して設けられた第1端子と、
前記第1基板の、前記第1面とは反対の第2面側に設けられた第2端子と
を備える第1電子部品と、
前記第2端子と接合された第3端子を備える第2電子部品と
を含むことを特徴とする電子装置。
第3熱伝導率を有する第3部位を含む第2基板と、
前記第3部位内に設けられ、前記第3熱伝導率よりも低い第4熱伝導率を有する第4部位と、
前記第2基板の第3面側に、前記第4部位に対応して設けられた前記第3端子と、
前記第2基板の、前記第3面とは反対の第4面側に設けられた第4端子と
を備え、
前記第4端子と接合された第5端子を備える第3電子部品を更に含むことを特徴とする付記8に記載の電子装置。
(付記11) 前記第1端子と接合された第6端子を備える第4電子部品を更に含むことを特徴とする付記8乃至10のいずれかに記載の電子装置。
前記第1部位内に設けられ、前記第1熱伝導率よりも低い第2熱伝導率を有する第2部位と、
前記第1基板の第1面側に、前記第2部位に対応して設けられた第1端子と、
前記第1基板の、前記第1面とは反対の第2面側に設けられた第2端子と
を備える第1電子部品の、前記第2端子を、第2電子部品の第3端子と対向させる工程と、
前記第2電子部品側から加熱を行い、前記第2端子と前記第3端子とを接合する工程と
を含むことを特徴とする電子装置の製造方法。
第3熱伝導率を有する第3部位を含む第2基板と、
前記第3部位内に設けられ、前記第3熱伝導率よりも低い第4熱伝導率を有する第4部位と、
前記第2基板の第3面側に、前記第4部位に対応して設けられた前記第3端子と、
前記第2基板の、前記第3面とは反対の第4面側に設けられた第4端子と
を備え、
前記第2端子と前記第3端子とを接合する工程後に、
前記第2電子部品の、前記第4端子を、第3電子部品の第5端子と対向させる工程と、
前記第3電子部品側から加熱を行い、前記第4端子と前記第5端子とを接合する工程と を更に含むことを特徴とする付記12に記載の電子装置の製造方法。
(付記15) 前記第2端子と前記第3端子とを接合する工程前に、前記第1電子部品には、前記第1端子に、第4電子部品の第6端子が接合されていることを特徴とする付記12乃至14のいずれかに記載の電子装置の製造方法。
10,20,30,60 電子部品
11,250 基板
11a,41a,261a,271a,310a,410a,510a,600a 表面
11b,41b,261b,310b,410b,510b,600b 裏面
11c,14,340,360,460,560,620 部位
12,13,23,32,43,45,55,56,63,96,97,107,223,232,252,262,263,272,380,480,521,580,630 端子
12a,23a,43a,45a,55a,81a,82a,96a,107a,262a,272a ピラー電極
12b,23b,43b,43d,45b,55b,55d,83,96b,107b,262b,272b 半田
40,40a,40b,40c,40d,40e,40f,40h,40i,50,81,82,90,100,230,260,270,300,420,520 半導体チップ
41,310 半導体基板
42,44,320,350,530,550 配線層
42a,44a,81c,81d,82c,82d,322,352,412,532,552,612 絶縁部
42aa,42ab 絶縁層
42ac,42af,48a 開口部
42ad キャップ膜
42ae パッシベーション膜
42b,44b,81e,82e,221,222,231,321,351,411,531,551,611 導体部
42c,52c,81b,92c 中空部
42h 気泡含有部
42ha 気泡
43aa シード層
43c,45c,55c,63c,351a,370,411a,470,551a,570,611a パッド
46,340 TSV
47 犠牲層
48 レジスト
70,510 樹脂層
80A,80B 解析モデル
200 積層構造
210,410 パッケージ基板
220 インターポーザ
261,271 本体部
311 素子分離領域
330 MOSトランジスタ
331 ゲート絶縁膜
332 ゲート電極
333 ソース領域
334 ドレイン領域
335 スペーサ
400A,400B,500 半導体パッケージ
421 半田バンプ
430 封止層
441 ダイアタッチ材
442 アンダーフィル樹脂
450 ワイヤ
540 貫通電極
600 回路基板
Claims (7)
- 第1絶縁層と、前記第1絶縁層上の第2絶縁層と、前記第2絶縁層上の第3絶縁層とを有し第1熱伝導率を有する第1部位を含む基板と、
前記第1部位内の前記第2絶縁層の一部を貫通して設けられ、前記第1熱伝導率よりも低い第2熱伝導率を有する空洞の第2部位と、
前記基板の第1面側に、前記第2部位に対応して設けられた第1端子と、
前記基板の、前記第1面とは反対の第2面側に設けられた第2端子と
を含むことを特徴とする電子部品。 - 第1絶縁層と、前記第1絶縁層上の第2絶縁層と、前記第2絶縁層上の第3絶縁層とを有し第1熱伝導率を有する第1部位を含む第1基板と、
前記第1部位内の前記第2絶縁層の一部を貫通して設けられ、前記第1熱伝導率よりも低い第2熱伝導率を有する空洞の第2部位と、
前記第1基板の第1面側に、前記第2部位に対応して設けられた第1端子と、
前記第1基板の、前記第1面とは反対の第2面側に設けられた第2端子と
を備える第1電子部品と、
前記第2端子と接合された第3端子を備える第2電子部品と
を含むことを特徴とする電子装置。 - 前記第2電子部品は、
第3熱伝導率を有する第3部位を含む第2基板と、
前記第3部位内に設けられ、前記第3熱伝導率よりも低い第4熱伝導率を有する第4部位と、
前記第2基板の第3面側に、前記第4部位に対応して設けられた前記第3端子と、
前記第2基板の、前記第3面とは反対の第4面側に設けられた第4端子と
を備え、
前記第4端子と接合された第5端子を備える第3電子部品を更に含むことを特徴とする請求項2に記載の電子装置。 - 前記第4部位は、前記第2部位とは体積が異なることを特徴とする請求項3に記載の電子装置。
- 第1絶縁層と、前記第1絶縁層上の第2絶縁層と、前記第2絶縁層上の第3絶縁層とを有し第1熱伝導率を有する第1部位を含む第1基板と、
前記第1部位内の前記第2絶縁層の一部を貫通して設けられ、前記第1熱伝導率よりも低い第2熱伝導率を有する空洞の第2部位と、
前記第1基板の第1面側に、前記第2部位に対応して設けられた第1端子と、
前記第1基板の、前記第1面とは反対の第2面側に設けられた第2端子と
を備える第1電子部品の、前記第2端子を、第2電子部品の第3端子と対向させる工程と、
前記第2電子部品側から加熱を行い、前記第2端子と前記第3端子とを接合する工程と
を含むことを特徴とする電子装置の製造方法。 - 前記第2電子部品は、
第3熱伝導率を有する第3部位を含む第2基板と、
前記第3部位内に設けられ、前記第3熱伝導率よりも低い第4熱伝導率を有する第4部位と、
前記第2基板の第3面側に、前記第4部位に対応して設けられた前記第3端子と、
前記第2基板の、前記第3面とは反対の第4面側に設けられた第4端子と
を備え、
前記第2端子と前記第3端子とを接合する工程後に、
前記第2電子部品の、前記第4端子を、第3電子部品の第5端子と対向させる工程と、
前記第3電子部品側から加熱を行い、前記第4端子と前記第5端子とを接合する工程と を更に含むことを特徴とする請求項5に記載の電子装置の製造方法。 - 前記第4部位は、前記第2部位よりも体積が小さいことを特徴とする請求項6に記載の電子装置の製造方法。
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