JP2011254013A - 半導体装置およびこれを用いた半導体リレー - Google Patents
半導体装置およびこれを用いた半導体リレー Download PDFInfo
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- JP2011254013A JP2011254013A JP2010128095A JP2010128095A JP2011254013A JP 2011254013 A JP2011254013 A JP 2011254013A JP 2010128095 A JP2010128095 A JP 2010128095A JP 2010128095 A JP2010128095 A JP 2010128095A JP 2011254013 A JP2011254013 A JP 2011254013A
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 123
- 150000001875 compounds Chemical class 0.000 claims abstract description 47
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical group [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 67
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 62
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 26
- 229910052710 silicon Inorganic materials 0.000 claims description 26
- 239000010703 silicon Substances 0.000 claims description 26
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 claims description 10
- 229910002601 GaN Inorganic materials 0.000 claims description 8
- 230000005669 field effect Effects 0.000 claims description 6
- 239000010410 layer Substances 0.000 description 19
- 239000000758 substrate Substances 0.000 description 18
- 230000015556 catabolic process Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 12
- 230000001681 protective effect Effects 0.000 description 11
- 239000013078 crystal Substances 0.000 description 10
- 230000007547 defect Effects 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 9
- 230000003287 optical effect Effects 0.000 description 7
- 150000004767 nitrides Chemical class 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 244000145845 chattering Species 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- -1 nitride compound Chemical class 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
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Abstract
【解決手段】ユニポーラ型の化合物半導体素子(30a)と、この化合物半導体素子(30a)に並列的に外部接続されたバイパス用半導体素子(40a)とを具備し、バイパス用半導体素子(40a)の通電開始電圧が化合物半導体素子(30a)のソース・ドレイン方向の通電開始電圧よりも小さいことを特徴とする。
【選択図】図3
Description
半導体リレーは、オン抵抗が小さく、微小アナログ信号を制御することができ、小型であることから、種々の用途に用いられている。
また、特許文献2,3については、窒化物系化合物半導体装置において窒化物系化合物半導体素子に保護素子を並列接続する例が示されているが、多数回にわたるON/OFFの繰り返しに起因する経時的変化については言及がない。またこれらはいずれも集積化されており、依然として窒化物系化合物半導体装置にも電流が流れることになる。このような窒化物系化合物半導体装置の場合、基板に対して垂直な方向に形成される貫通転位を避けて電流が流れるようにしているが、実際には高抵抗のエピタキシャル成長層を電流が流れることになり、消費電力は依然として大きく、十分な消費電力の低減は困難であるという問題がある。
このような結晶欠陥の拡張は、程度の差はあるが、SiCMOSFETだけでなく、GaN系のFETなど化合物半導体を用いて形成したFETには同様に生じる場合がある。
本発明は、前記実情に鑑みてなされたもので、オン抵抗の増大を抑制し、信頼性の高い半導体装置を提供することを目的とする。
また本発明は、上記半導体装置において、バイパス用の半導体素子がシリコンダイオードであり、化合物半導体素子のドレインにこのシリコンダイオードのカソードを接続するとともに、化合物半導体素子のソースにシリコンダイオードのアノードを接続したことを特徴とする。
また本発明は、上記半導体装置において、バイパス用の半導体素子がシリコンMOSFETであり、化合物半導体素子のドレインにシリコンMOSFETのドレインを接続するとともに、化合物半導体素子のソースにシリコンMOSFETのソースを接続したことを特徴とする。
また本発明は、上記半導体装置において、前記バイパス用の半導体素子がシリコンカーバイドショットキーダイオードであり、前記化合物半導体素子のドレインにシリコンカーバイドショットキーダイオードのカソードを接続するとともに、前記化合物半導体素子のソースにシリコンカーバイドショットキーダイオードのアノードを接続したことを特徴とする。
また本発明は、上記半導体装置において、前記化合物半導体素子がシリコンカーバイド(SiC)FET、あるいはガリウムナイトライド(GaN)FETであることを特徴とする。
また本発明は、上記半導体装置において、前記化合物半導体素子のソースを共通に逆直列に接続されたことを特徴とする。
また本発明は、上記半導体装置において、入力信号により発光する発光素子と、その光を受けて発電するフォトダイオードアレイと、フォトダイオードアレイと並列に接続された充放電回路と、出力接点に相当する化合物半導体素子のゲート及びソースが前記フォトダイオードアレイの両端に接続されたことを特徴とする。
(実施の形態1)
実施の形態1の半導体リレーは、化合物半導体装置であるSiCMOSFETで構成される出力素子の保護素子として、シリコンダイオードを外部接続した出力素子を用いたことを特徴とするものである。そして、本実施の形態の半導体リレーは、入力信号により発光する発光素子と、その光を受けて発電するフォトダイオードアレイと、前記フォトダイオードアレイと並列に接続された充放電回路と、出力接点に相当する化合物半導体素子のゲート及びソースが前記フォトダイオードアレイの両端に接続されている。
発光素子10は、第1及び第2の入力端子T1、T2から入力信号が入力されることによって発光し、光信号を生成する。フォトダイオードアレイ21は、発光素子10の光信号を受光してその両端で起電力を発生し、電圧を出力する。
1)保護素子として外部接続のシリコンダイオードを用いるため、簡単な構成で信頼性の高い半導体装置製造が容易で光結合を用いているため、入出力間が電気的に完全に分離できる。
2)負荷側のスイッチとして電力用のSiCMOSFETを用いているので、チャタリングや機械的ノイズが発生しない。ON状態で直線性が高いため、アナログ信号の制御が可能である。
3)出力回路がFETを逆直列で構成されているため、交流・直流の両用に適用可能である。
本実施の形態2の半導体装置として、図7に示すように、保護素子50を構成するバイパス用の半導体素子がSiMOSFET51で構成されており、出力素子30のSiCMOSFET31のドレインにSiMOSFET51のドレインを接続するとともに、SiCMOSFET31のソースにSiMOSFET51のソースを接続したことを特徴とする。
本実施の形態3の半導体装置として、図8に示すように、保護素子を構成するバイパス用の半導体素子がシリコンカーバイド(SiC)ショットキーダイオード60であり、SiCMOSFET31のドレインにSiCショットキーダイオード60のカソードを接続するとともに、SiCMOSFET31のソースにSiCショットキーダイオード60のアノードを接続したことを特徴とする。
また、前記実施の形態1および2のSiダイオード、SiMOSFETに比べ、SiCは高温に強い特性も生かすことができる。
これによりGaNFETのゲート破壊も防止できる。一般的にゲート−ドレイン間についての耐圧対策は施されているが、ゲート−ソース間は耐圧が低いため、ソース−ドレイン間への電圧印加には弱いという課題があったのに対し、本実施の形態によればゲート破壊防止を図ることができる。
また、本発明は、SiCMOSFETあるいはGaNMOSFETなどのFETに限定されることなく、化合物半導体を用いたショットキーゲートFETなど、化合物半導体を用いたFETに適用可能である。
2 エピタキシャル成長層
3、3s p型のウェル領域
4 ソース領域
5 ソース電極
6 ゲート絶縁膜
7 ゲート電極
8 層間絶縁膜
9 ドレイン電極
T1、T2 入力端子
T3、T4 出力端子
10 発光素子
15 リードフレーム
20 光電変換装置
21 フォトダイオードアレイ
22 充放電回路
30、30a、30b 出力素子
31、31a、31b SiCMOSFET
32、32a、32b SiCボディダイオード(内蔵)
40、40a、40b Siダイオード(保護素子)
50 保護素子
51 SiMOSFET
52 ボディダイオード(内蔵)
60 シリコンカーバイド(SiC)ショットキーダイオード
100 パッケージ
Claims (7)
- ユニポーラ型の化合物半導体素子と、前記化合物半導体素子に並列的に外部接続されたバイパス用半導体素子とを具備し、
前記バイパス用半導体素子の通電開始電圧が前記化合物半導体素子のソースからドレイン方向の通電開始電圧よりも小さい半導体装置。 - 請求項1に記載の半導体装置であって、
前記バイパス用の半導体素子がシリコンダイオードであり、
前記化合物半導体素子のドレインに前記シリコンダイオードのカソードを接続するとともに、
前記化合物半導体素子のソースに前記シリコンダイオードのアノードを接続した半導体装置。 - 請求項1に記載の半導体装置であって、
前記バイパス用の半導体素子がシリコン電界効果トランジスタ(SiMOSFET)であり、
前記化合物半導体素子のドレインにSiMOSFETのドレインを接続するとともに、
前記化合物半導体素子のソースにSiMOSFETのソースを接続した半導体装置。 - 請求項1に記載の半導体装置であって、
前記バイパス用の半導体素子がシリコンカーバイド(SiC)ショットキーダイオードであり、
前記化合物半導体素子のドレインにSiCショットキーダイオードのカソードを接続するとともに、
前記化合物半導体素子のソースにSiCショットキーダイオードのアノードを接続した半導体装置。 - 請求項1乃至4のいずれか1項に記載の半導体装置であって、
前記化合物半導体素子がシリコンカーバイド電界効果トランジスタ(SiCFET)、あるいはガリウムナイトライド電界効果トランジスタ(GaNFET)である半導体装置。 - 請求項1乃至5のいずれか1項に記載の半導体装置であって、
前記化合物半導体素子のソースを共通に逆直列に接続された半導体装置。 - 請求項1乃至6のいずれか1項に記載の半導体装置を複数個と、
入力信号により発光する発光素子と、その光を受けて発電するフォトダイオードアレイと、
前記フォトダイオードアレイと並列に接続された充放電回路と、
前記出力接点に相当する化合物半導体素子のゲート及びソースが前記フォトダイオードアレイの両端に接続された半導体リレー。
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