JP7484156B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
- Publication number
- JP7484156B2 JP7484156B2 JP2019227825A JP2019227825A JP7484156B2 JP 7484156 B2 JP7484156 B2 JP 7484156B2 JP 2019227825 A JP2019227825 A JP 2019227825A JP 2019227825 A JP2019227825 A JP 2019227825A JP 7484156 B2 JP7484156 B2 JP 7484156B2
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- conductor
- layer
- circuit board
- semiconductor device
- semiconductor
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Description
図1は第1の実施の形態に係る半導体装置の第1の例について説明する図である。図1には、半導体装置の一例の要部断面図を模式的に示している。
半導体素子2を挟んで対向する導体層3及び導体層4には、各種導体材料が用いられる。例えば、導体層3及び導体層4には、銅(Cu)、銀(Ag)、アルミニウム(Al)等の導体材料が用いられる。導体層3及び導体層4には、例えば、同一又は同等の形状、サイズを有する導体層が用いられる。導体層3及び導体層4には、導体板、導体箔、導体シート、導体フィルムといった各種形態の導体層を用いることができる。導体層3及び導体層4は、絶縁板上に設けられるものであってもよい。導体層3及び導体層4には、リードフレームが用いられてもよい。
図2には、上記図1に示したような構成を有する半導体装置1で実現可能な回路の一例の等価回路図を示している。図2の例では、半導体素子2を2つとし、それらをいずれも、1つの半導体チップにIGBT2dとFWD2eとが内蔵されたRC-IGBTとしている。RC-IGBTでは、IGBT2dのコレクタ電極CとFWD2eのカソード電極Kとが接続され、IGBT2dのエミッタ電極EとFWD2eのアノード電極Aとが接続される。
この場合、半導体装置1の動作時には、回路基板5を通じて、2つの半導体素子2の制御電極2c(ゲート電極G)と負極電極2b(エミッタ電極E)との間に、2つの半導体素子2のオン(ON)及びオフ(OFF)の状態を制御するための、スイッチング制御用の電圧が印加される。そして、2つの半導体素子2の正極電極2a(コレクタ電極C)に接続された導体層3と、負極電極2b(エミッタ電極E)に接続された導体層4との間に、2つの半導体素子2の正極電極2aから負極電極2bへと主電流を流すための、主電流用の電圧が印加される。
半導体装置1では、図1に示したように、接合材7、導体ブロック8及び接合材9を介した導体層4と複数の半導体素子2との間隙S1に、回路基板5が設けられ、各半導体素子2の制御電極2c(及び負極電極2b)が、回路基板5と接続される。これにより、半導体装置1では、例えば、導体層3と同じレイヤーに、導体層3から分離して、制御電極2cへの電圧印可用のランド等の配線パターンを設け、当該配線パターンと制御電極2cとをワイヤボンディングするような形態に比べ、小型化を図ることが可能になる。即ち、当該配線パターンを不要にすることで、導体層3(及びそれと対向する導体層4)の平面方向のサイズを小さくすることが可能になる。更に、当該配線パターンを複数の半導体素子2間に設け、それと制御電極2cとをワイヤボンディングする場合に比べ、複数の半導体素子2間の距離を短縮することが可能になり、それらが搭載される導体層3(及びそれと対向する導体層4)の平面方向のサイズを小さくすることが可能になる。また、制御電極2cのワイヤボンディングを不要にすることで、導体ブロック8の厚さを薄くすることが可能になる。
図3は第1の実施の形態に係る半導体装置の第2の例について説明する図である。図3には、半導体装置の一例の要部断面図を模式的に示している。
図4は第1の実施の形態に係る半導体装置の第3の例について説明する図である。図4には、半導体装置の一例の要部断面図を模式的に示している。
ここで、上記のような回路基板5Bの構成例及び半導体素子2との接続例について、図5及び図6を参照して更に説明する。
図7及び図8は第1の実施の形態に係る回路基板の配線層の構成例について説明する図である。図7には、回路基板の一例の要部平面透過図を模式的に示している。図8(A)には、回路基板の一例の要部平面図を模式的に示し、図8(B)には、回路基板の一例の要部側面図を模式的に示し、図8(C)には、回路基板の一例の要部底面図を模式的に示している。
図10は第1の実施の形態に係る回路基板の配置例について説明する図である。図10(A)及び図10(B)にはそれぞれ、回路基板を用いた半導体装置の一例の要部平面図を模式的に示している。
図11~図14は第2の実施の形態に係る半導体装置の一例について説明する図である。図11には、半導体装置の一例の要部平面図を模式的に示している。図12には、図11のL1-L1断面図を模式的に示している。図13には、図11のL2-L2断面図を模式的に示している。図14には、図11のL3-L3断面図を模式的に示している。
ここでは、半導体素子20として、IGBTとそれに接続されるFWDとを含むRC-IGBTが用いられる場合を例にして説明する。
半導体装置10の動作時には、回路基板50の配線層53及び配線層52を通じて、2つの半導体素子20のゲート電極23(ゲート電極G)とエミッタ電極22(エミッタ電極E)との間に、2つの半導体素子20のON及びOFFの状態を制御するための、スイッチング制御用の電圧が印加される。そして、2つの半導体素子20のコレクタ電極21(コレクタ電極C)に導体層32等を介して繋がる正極端子34と、エミッタ電極22(エミッタ電極E)に導体層43等を介して繋がる負極端子44との間に、2つの半導体素子20のコレクタ電極21からエミッタ電極22へと主電流を流すための、主電流用の電圧が印加される。
図15は第2の実施の形態に係る回路基板の一例について説明する図である。図15(A)には、回路基板の一例の要部平面図を模式的に示し、図15(B)には、回路基板の一例の要部側面図を模式的に示し、図15(C)には、回路基板の一例の要部底面図を模式的に示している。
図16に示す半導体装置1000は、2つの半導体素子20と、2つの半導体素子20を挟んで対向する基板30及び基板40とを有する。各半導体素子20のコレクタ電極21が、接合材60を介して、基板30の導体層32と接続され、エミッタ電極22が、接合材70、導体ブロック80及び接合材90を介して、基板40の導体層43と接続される。半導体装置1000では、基板30の絶縁板31に、半導体素子20のコレクタ電極21が接続される導体層32と共に、その導体層32からは分離されて配線パターン1001が設けられる。配線パターン1001は、例えば、2つの半導体素子20間の領域に設けられる。配線パターン1001には、例えば、各半導体素子20のゲート電極23が、ワイヤ1002を介して接続される。配線パターン1001及びワイヤ1002を通じて、各半導体素子20のゲート電極23に対してスイッチング制御用の電圧が印加される。
更にまた、半導体装置10では、上記のように導体ブロック80を薄くすることで、主電流の流れる基板30の導体層32と基板40の導体層43との間の距離が短縮され、相互インダクタンスが増大する。これにより、半導体素子20のスイッチング制御時のトータルのインダクタンスを低減することが可能になる。
以上述べたような半導体装置10は、複数個を並列接続又は直列接続することが可能である。
図19では便宜上、負極端子44が設けられる基板40の図示を省略している。例えば、図19に示す半導体装置10Aには、4つの半導体素子20が設けられる。4つの半導体素子20には、同種の半導体素子20が用いられてもよいし、異種の半導体素子20が用いられてもよい。
[第3の実施の形態]
図20は第3の実施の形態に係る半導体装置の一例について説明する図である。図20には、半導体装置の一例の要部断面図を模式的に示している。
尚、上記第2の実施の形態(図17及び図18)の例に従い、この第3の実施の形態で述べたような半導体装置10Bを複数、並列接続又は直列接続することが可能である。
図21は第4の実施の形態に係る半導体装置の一例について説明する図である。図21(A)及び図21(B)にはそれぞれ、半導体装置の一例の要部断面図を模式的に示している。
図21(B)に示す半導体装置10Dは、上記第2の実施の形態で述べた半導体装置10(図12等)の、樹脂100並びにそこから露出する基板30の導体層33及び基板40の導体層42の上に、熱界面材料110を介して、冷却部材130が設けられた構成を有する。半導体装置10Dの冷却部材130は、本体部131と、本体部131内に設けられて液体又は気体の冷媒が流通される冷媒流路132とを備える。
半導体装置10C及び半導体装置10Dにはそれぞれ、3つ以上の半導体素子20が搭載されてもよい。
図22は第5の実施の形態に係る半導体装置の一例について説明する図である。図22(A)~図22(C)にはそれぞれ、半導体装置の一例の要部断面図を模式的に示している。
2,20 半導体素子
2a 正極電極
2b 負極電極
2c 制御電極
2d IGBT
2e FWD
2x,2y,5aa,5ab,20a,20b,31a,31b,41a,41b,51a,51b 主面
3,4,32,33,42,43 導体層
3a,34 正極端子
3b,3c,4b,4c,32a,43a 縁部
4a,44 負極端子
5,5A,5B,50 回路基板
5a,51,140 絶縁層
5b,5b1,5b2,52,53,501,502 配線層
5c,56,57 接続部
5ca 半田バンプ
5cb スタッドバンプ
5d,54,55 導体部
5da スルーホール
5db ピラー
5e 貫通孔
5f 充填材
5g ピン
5h,5i,58,59 端子
6,7,9,60,70,90 接合材
8,80 導体ブロック
21 コレクタ電極
22 エミッタ電極
23 ゲート電極
30,40 基板
30E,40E 導体板
31,41 絶縁板
50a,50b,X1,X2 端部
50aa 幅狭部位
50ab 幅広部位
50ac 一定幅部位
50c,X3 中間部
100 樹脂
110 熱界面材料
120,130 冷却部材
121 フィン
131 本体部
132 冷媒流路
501a,502a 電磁界
503 重なり部分
1001 配線パターン
1002 ワイヤ
D1,D2 方向
S1,S2 間隙
W2a,W2b,W3a,W3b 幅
Claims (7)
- 第1導体層と、
前記第1導体層と対向する第2導体層と、
前記第1導体層と前記第2導体層との間に設けられた半導体素子群と、
対向する前記第2導体層と前記半導体素子群の各々の一部との間に設けられた導体ブロック群と、
前記導体ブロック群を介して対向する前記第2導体層と前記半導体素子群との間隙に位置し且つ平面視で前記半導体素子群の各々が部分的に重複する一端部を有する回路基板と
を含む半導体モジュールを備え、
前記半導体素子群は、各々、
前記第1導体層と対向する第1主面に設けられ、前記第1導体層と電気的に接続された第1主電極と、
前記第2導体層と対向する第2主面に設けられ、前記導体ブロックを介して前記第2導体層と電気的に接続された第2主電極と、
前記第2主面に設けられた制御電極と
を有し、
前記回路基板は、
絶縁層と、
前記絶縁層の一方の主面に積層され、前記半導体素子群の各々の前記制御電極と電気的に接続された第1配線層と、
前記絶縁層の他方の主面に積層され、前記半導体素子群の各々の前記第2主電極と電気的に接続された第2配線層と、
を有し、
平面視で前記半導体素子群の各々は、前記第1配線層及び前記第2配線層と部分的に重複し、
一方の前記一端部と他方の他端部との間であって、平面視で前記半導体素子群の外側に位置する中間部において、平面視で前記第1配線層の一部と前記第2配線層の一部とが重複することを特徴とする半導体装置。 - 前記制御電極は、平面視で前記一端部と重複する部位に設けられることを特徴とする請求項1に記載の半導体装置。
- 前記第1配線層と前記半導体素子群の各々の前記制御電極とを電気的に接続する第1導体接続部群を含むことを特徴とする請求項1又は2に記載の半導体装置。
- 前記第2配線層と前記半導体素子群の各々の前記第2主電極とを電気的に接続する第2導体接続部群を含むことを特徴とする請求項3に記載の半導体装置。
- 平面視で前記第1導体層の第1方向の縁部に設けられた第1端子と、
平面視で前記第2導体層の前記第1方向の縁部に設けられた第2端子と
を含み、
前記回路基板は、平面視で前記第1導体層及び前記第2導体層の前記第1方向とは反対の第2方向の外側に延出することを特徴とする請求項1から4のいずれか一項に記載の半導体装置。 - 前記回路基板は、平面視で前記第1導体層及び前記第2導体層の外側に延在し、前記第1端子及び前記第2端子と並設される前記他端部を有することを特徴とする請求項5に記載の半導体装置。
- 並列接続又は直列接続された複数の前記半導体モジュールを含むことを特徴とする請求項1から6のいずれか一項に記載の半導体装置。
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