JP5300264B2 - 半導体デバイスおよび半導体デバイスの製造方法 - Google Patents
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Description
本発明は請求項1の上位概念記載の半導体デバイスおよびその製造方法に関する。本発明の半導体デバイスはトレンチ構造を備えたジャンクションバリア型ショットキーダイオードである。当該の半導体デバイスは車両の搭載電源においてツェナーダイオードとして使用されるのに特に良好に適している。
本発明の請求項1記載の半導体デバイスは低い順方向電圧、低い阻止電流および高いローバスト性を有する。
以下に、添付図を参照しながら本発明の実施例について詳細に説明する。図1には従来のジャンクションバリア型ショットキーダイオードが示されている。図2には従来のトレンチMOSバリア型ショットキーダイオードが示されている。図3には本発明の半導体デバイスの第1の実施例が示されている。図4には本発明の半導体デバイスの第2の実施例が示されている。図5には本発明の半導体デバイスの第3の実施例が示されている。図6には本発明の半導体デバイスの第4の実施例が示されている。図7には本発明の半導体デバイスの第5の実施例が示されている。図8には本発明の製造方法の第1の実施例のフローチャートが示されている。図9には本発明の製造方法の第2の実施例のフローチャートが示されている。図10には本発明の製造方法の第3の実施例のフローチャートが示されている。図11には本発明の製造方法の第4の実施例のフローチャートが示されている。
本発明によって得られる利点をより良く理解してもらうために、まず公知の半導体デバイスを簡単に説明する。図1には、従来のジャンクションバリア型ショットキーダイオードJBSの形態の半導体デバイス10が示されている。この半導体デバイス10は、n+型基板1、n型層2、このn型層内へ拡散された少なくとも2つのp型ウェル3、および、チップの前面および後面のコンタクト層4,5から成る。電気的に見ると、JBSはPNダイオードすなわちアノードとしてのp型ウェル3とカソードとしてのn型層2とのあいだのPN接合領域と、ショットキーダイオードすなわちアノードとしてのコンタクト層4とカソードとしてのn型層2とのあいだのショットキーバリアとのコンビネーションである。チップの後面のコンタクト層5はカソード電極として用いられ、チップの前面のコンタクト層4はp型ウェル3に対するオーミックコンタクトでありかつn型層2に対するショットキーコンタクトであるアノード電極として用いられる。ショットキーダイオードの順方向電圧がPNダイオードの電圧よりも小さいので、電流はショットキーダイオードの領域のみを通って順方向に流れる。そのため、JBSでの順方向電流に対する単位面積当たりの有効面積は従来のプレーナ形ショットキーダイオードでの順方向電流に対する単位面積当たりの有効面積よりも格段に小さい。阻止方向では電圧が上昇するにつれて空間電荷領域が拡大し、JBSのブレークダウン電圧よりも小さい電圧では隣接する2つのp型ウェル間の領域の中央付近で衝突する。これにより、高い阻止電流の原因となるショットキー効果が部分的に遮蔽され、阻止電流が低減される。こうした遮蔽作用は構造パラメータ、例えばp型ドーパント拡散の侵入深さXjp、p型ウェル間の距離Wnおよびp型ウェルの幅Wpなどに強く依存する。JBSのp型ウェルを実現する技術として、通常は、p型ドーパントインプランテーションおよびこれに続くp型ドーパント拡散が行われる。x方向の水平拡散すなわちその深さがy方向の垂直拡散となる拡散により、2次元のxy平面に対して垂直なz方向に有限な長さを有し、その径が侵入深さXjpに相応する円筒状のp型ウェルが生じる。空間電荷領域が径方向に拡大するため、この形態のp型ウェルではショットキー効果に対して有効な遮蔽作用がほとんど得られない。また、水平拡散も相応に幅広となるので、より深くp型ドーパントを拡散させるのみで遮蔽作用を増大することは不可能である。また、p型ウェル間の距離Wnをこれ以上小さくすることもきわめて難しい。たとえそうして遮蔽作用を増大したとしても、順方向電流に対する有効面積も小さくなってしまうからである。
Claims (21)
- トレンチジャンクションバリア型ショットキーダイオードとクランプ素子として用いられるPNダイオードとから成るコンビネーション部を含み、
前記PNダイオードのブレークダウン電圧(BV_pn)は前記ショットキーダイオードのブレークダウン電圧(BV_schottly)よりも低い、
半導体デバイス(30,40,50,60,70)において、
前記半導体デバイス(30,40,50,60,70)はn+型基板(1)を含み、該n+基板上にn型層(2)が配置されており、該n型層内に第1のトレンチおよび第2のトレンチ(7,7b)が設けられ、前記第2のトレンチ(7b)は前記第1のトレンチ(7)よりも前記半導体デバイスの縁部側に位置し、各トレンチがp型ドープ物質で充填されて内部に2つの第1のp型ドープ領域(8,8b)が形成されており、
さらに、前記第2のトレンチ(7b)に接して第2のp型ドープ領域(10)が形成されており、ここで、該第2のp型ドープ領域は、各トレンチ間には延在せず、前記半導体デバイスの縁部側へ延在するように、その位置が選定されており、
前記半導体デバイスの前面に第1のコンタクト層(4)が配置され、後面に第2のコンタクト層(5)が配置されており、
各トレンチの深さ(Dt)は1μmから3μmであり、
前記第2のp型ドープ領域の前記n型層への侵入深さ(Xjp_edge)は各トレンチの深さよりも大きい
ことを特徴とする半導体デバイス。 - 前記PNダイオードのブレークダウンが発生する場合、該ブレークダウンは各トレンチ(7,7b)の底面の領域で発生する、請求項1記載の半導体デバイス。
- 前記半導体デバイスがPN階段接合領域を有している、請求項1または2記載の半導体デバイス。
- 前記第1のコンタクト層(4)は前記半導体デバイス(60)の前面の一部のみを覆っており、該前面のうち前記第1のコンタクト層(4)によって覆われていない部分領域が酸化層(11)によって覆われており、前記第2のコンタクト層(5)は前記半導体デバイス(60)の後面の全面を覆っている、請求項1記載の半導体デバイス。
- 前記第2のp型ドープ領域は前記半導体デバイス(70)の縁にまで達しており、各コンタクト層(4,5)は前記半導体デバイス(70)の前面および後面を完全に覆っている、請求項1記載の半導体デバイス。
- 各p型ドープ領域はp型ドープされたSiまたはPoly‐Siから成る、請求項1から5までのいずれか1項記載の半導体デバイス。
- 各コンタクト層(4,5)は金属から成る、請求項1から6までのいずれか1項記載の半導体デバイス。
- 各コンタクト層(4,5)は多層に構成されている、請求項1から7までのいずれか1項記載の半導体デバイス。
- 各トレンチは条片状またはアイランド状に構成されている、請求項1から8までのいずれか1項記載の半導体デバイス。
- 前記半導体デバイスは、電流密度400A/cm2から600A/cm2、ブレークダウン電圧12Vから30Vのブレークダウンモードで駆動可能である、請求項1から9までのいずれか1項記載の半導体デバイス。
- 前記半導体デバイスがツェナーダイオードとして使用される、請求項10記載の半導体デバイス。
- 前記半導体デバイスが車両のジェネレータシステムにおいて使用される、請求項11記載の半導体デバイス。
- ステップa:n+型基板(1)上にn型層(2)を被着し、
ステップb:該n型層(2)内に深さ(Dt)それぞれ1μmから3μmの第1のトレンチおよび第2のトレンチ(7,7b)を形成し、ここで、前記第2のトレンチ(7b)が前記第1のトレンチ(7)よりも前記半導体デバイスの縁部側に位置するようにし、該2つのトレンチ(7,7b)にp型ドープ物質を充填して2つの第1のp型ドープ領域(8,8b)を形成し、さらに、前記第2のトレンチ(7b)に接するように第2のp型ドープ領域(10)を前記n型層内に形成し、ここで、前記第2のp型ドープ領域が、各トレンチ間には延在せず、前記半導体デバイスの縁部側へ延在するように、その位置を選定し、さらに、前記第2のp型ドープ領域の前記n型層への侵入深さ(Xjp_edge)が各トレンチの深さよりも大きくなるようにして、半導体デバイスとし、
ステップc:前記半導体デバイスの前面を第1のコンタクト層(4)で覆い、後面を第2のコンタクト層(5)で覆う
ことを特徴とする半導体デバイス(30,40,50,60,70)の製造方法。 - 前記ステップcにおいて、前記半導体デバイス(60)の前記前面の一部のみを前記第1のコンタクト層(4)によって覆い、該前面のうち前記第1のコンタクト層(4)によって覆われない領域を酸化層(11)によって覆い、前記半導体デバイス(60)の前記後面を前記第2のコンタクト層(5)によって完全に覆う、
請求項13記載の半導体デバイスの製造方法。 - 前記ステップbにおいて、さらに、前記第2のp型ドープ領域(10)が前記半導体デバイス(70)の縁にまで達するようにし、
前記ステップcにおいて、前記半導体デバイス(70)の前記前面を前記第1のコンタクト層(4)によって完全に覆い、前記半導体デバイス(70)の前記後面を前記第2のコンタクト層(5)によって完全に覆う、
請求項13記載の半導体デバイスの製造方法。 - 各p型ドープ領域をp型ドープされたSiまたはPoly‐Siから形成する、請求項13から15までのいずれか1項記載の半導体デバイスの製造方法。
- 前記第2のp型ドープ領域(10)を拡散プロセスにより形成する、請求項14または15記載の半導体デバイスの製造方法。
- 各p型ドープ領域(8,8b,10)を形成するためにp型ドープ物質を気相から析出する、請求項13から15までのいずれか1項記載の半導体デバイスの製造方法。
- 各p型ドープ領域(8,8b,10)を形成するためにp型ドープ物質をイオンインプランテーションにより打ち込む、請求項13から15までのいずれか1項記載の半導体デバイスの製造方法。
- 前記p型ドープ物質としてホウ素またはホウ素イオンを用いる、請求項13から19までのいずれか1項記載の半導体デバイスの製造方法。
- 前記n+型基板(1)上に前記n型層(2)をエピタキシプロセスにより形成する、請求項13から20までのいずれか1項記載の半導体デバイスの製造方法。
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DE102004053761A DE102004053761A1 (de) | 2004-11-08 | 2004-11-08 | Halbleitereinrichtung und Verfahren für deren Herstellung |
DE102004053761.5 | 2004-11-08 | ||
PCT/EP2005/055463 WO2006048387A1 (de) | 2004-11-08 | 2005-10-21 | Halbleitereinrichtung und verfahren für deren herstellung |
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EP (1) | EP1812971B1 (ja) |
JP (1) | JP5300264B2 (ja) |
KR (1) | KR20070084014A (ja) |
CN (1) | CN101091260B (ja) |
DE (1) | DE102004053761A1 (ja) |
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WO (1) | WO2006048387A1 (ja) |
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EP1812971B1 (de) | 2020-01-15 |
JP2008519448A (ja) | 2008-06-05 |
US20080197439A1 (en) | 2008-08-21 |
DE102004053761A1 (de) | 2006-05-18 |
CN101091260B (zh) | 2013-04-17 |
KR20070084014A (ko) | 2007-08-24 |
TW200633237A (en) | 2006-09-16 |
EP1812971A1 (de) | 2007-08-01 |
WO2006048387A1 (de) | 2006-05-11 |
TWI398003B (zh) | 2013-06-01 |
CN101091260A (zh) | 2007-12-19 |
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R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
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R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |