JP5987035B2 - スーパージャンクショントレンチパワーmosfetデバイス及びその製造方法 - Google Patents
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Description
この出願は、本出願の譲受人に譲渡された「Super Junction Trench Power MOSFET Device Fabrication」と題されるGao等による2009年8月27日に出願された同時係属の米国特許出願第12/549,190号に関連する。
第2型ドーパントのカラムを前記第1型ドーパントの第1のカラムから分離する絶縁材料を備える第1のカラムと、
前記第2型ドーパントの前記カラムを前記第1型ドーパントの第2のカラムから分離する絶縁材料を備える第2のカラムと、
絶縁材料の前記第1のカラムと絶縁材料の前記第2のカラムとの間に位置合わせされる電界効果トランジスタのためのゲート要素と、
を備えるスーパージャンクショントレンチパワーMOSFET。
前記第1型ドーパントの基板と、
前記基板に結合されるとともに、前記第1型ドーパントの柱状の第1の領域と前記第1型ドーパントの柱状の第2の領域との間に配置される第2型ドーパントの柱状領域を備え、前記第2型ドーパントの前記領域が、第1の絶縁層によって前記第1型ドーパントの前記第1の領域から分離されるとともに、第2の絶縁層によって前記第1型ドーパントの前記第2の領域から分離される、スーパージャンクション構造体と、
前記スーパージャンクション構造体に結合されるとともに、ゲート要素を備え、前記ゲート要素が前記第2型ドーパントの前記領域の長手方向軸と位置合わせされる電界効果トランジスタと、
を備える半導体デバイス。
前記第1型ドーパントの基板と、
前記基板に結合されるとともに、前記第1型ドーパントの第1の領域と前記第1型ドーパントの第2の領域との間に配置された第2型ドーパントの領域を備え、前記第2型ドーパントの前記領域および前記第1型ドーパントの前記第1および第2の領域がそれぞれ第2の寸法よりも大きい第1の寸法を有し、前記第1の寸法が第1の方向で測定され、前記第2の寸法が前記第1の方向と直交する第2の方向で測定される、スーパージャンクション構造体と、
ゲート要素を備え、前記第2型ドーパントの前記領域が前記第1の方向で前記ゲート要素と前記基板との間に位置する、電界効果トランジスタと、
前記第1の方向および前記第2の方向の両方と直交する第3の方向で前記第2型ドーパントの前記領域に電気的に短絡されるソース金属の層と、
を備える半導体デバイス。
Claims (13)
- 第1型ドーパントのチャネルを有するスーパージャンクショントレンチパワー金属酸化膜半導体電界効果トランジスタ(MOSFET)デバイスであって、
前記第1型ドーパントを備える基板上に設けられる第1絶縁材料の第1のカラムであって、前記基板上に設けられる第2型ドーパントを備えるカラムを前記第1型ドーパントを備える第1のカラムから分離する第1絶縁材料の第1のカラムと、
前記基板上に設けられる前記第1絶縁材料の第2のカラムであって、前記第2型ドーパントを備える前記カラムを前記第1型ドーパントを備える第2のカラムから分離する第1絶縁材料の第2のカラムと、
前記第2型ドーパントを備える前記カラムの直上であって前記第1絶縁材料の前記第1のカラムと前記第2のカラムの間に設けられる絶縁層と、
前記第1型ドーパントを備える前記第1のカラムの上側に設けられる前記第2型ドーパントを備えるボディ領域と、
前記ボディ領域の上側に設けられる前記第1型ドーパントを備えるソース領域と、
前記絶縁層に接して設けられ、前記第1絶縁材料の前記第1のカラムの上側に設けられる第2絶縁材料のカラムにより前記ボディ領域および前記ソース領域から分離されるゲート要素と、
前記第1型ドーパントを備える前記第1のカラムの上側に形成されるトレンチであって、前記トレンチ内に形成されるソース金属に前記ボディ領域および前記ソース領域を露出させ、前記ソース金属が前記ボディ領域および前記ソース領域に接触し、前記ボディ領域が前記トレンチの底部を越えて延びるトレンチと、
前記トレンチの底部に形成され、前記トレンチよりも幅が広く、前記トレンチ内の前記ソース金属を前記第1型ドーパントを備える前記第1のカラムから分離する前記第2型ドーパントを備えるコンタクト領域と、
を備えるスーパージャンクショントレンチパワーMOSFET。 - 前記コンタクト領域の下側にて前記ゲート要素の底部と前記第1型ドーパントを備える前記第1のカラムの頂部とが重なり合う量が約0.1μmである請求項1に記載のスーパージャンクショントレンチパワーMOSFET。
- 前記第1型ドーパントがn型ドーパントを備え、前記第2型ドーパントがp型ドーパントを備える請求項1に記載のスーパージャンクショントレンチパワーMOSFET。
- 前記第1型ドーパントがp型ドーパントを備え、前記第2型ドーパントがn型ドーパントを備える請求項1に記載のスーパージャンクショントレンチパワーMOSFET。
- 前記ソース金属は、前記第2型ドーパントを備える前記カラムに電気的に短絡される請求項1に記載のスーパージャンクショントレンチパワーMOSFET。
- 前記ソース金属は、前記第2型ドーパントを備える前記カラムの長手方向軸と直交する方向で前記第2型ドーパントを備える前記カラムに電気的に短絡される請求項5に記載のスーパージャンクショントレンチパワーMOSFET。
- 前記トレンチは、前記第1型ドーパントを備える前記第1のカラムの長手方向軸と位置合わせされる請求項1または6に記載のスーパージャンクショントレンチパワーMOSFET。
- 第1型ドーパントのチャネルを有する半導体デバイスであって、
前記第1型ドーパントを備える基板と、
前記基板に結合されるとともに、前記基板上に設けられる前記第1型ドーパントを備える柱状の第1の領域と前記基板上に設けられる前記第1型ドーパントを備える柱状の第2の領域との間に配置される前記基板上に設けられる第2型ドーパントを備える柱状領域を備え、前記第2型ドーパントを備える前記柱状領域が、第1の絶縁層によって前記第1型ドーパントを備える前記柱状の第1の領域から分離されるとともに、第2の絶縁層によって前記第1型ドーパントを備える前記柱状の第2の領域から分離される、スーパージャンクション構造体と、
前記スーパージャンクション構造体に結合され、前記第2型ドーパントを備える前記柱状領域の上側に位置するゲート要素を備える電界効果トランジスタと、
前記ゲート要素の下側に位置し、前記ゲート要素を前記第2型ドーパントを備える前記柱状領域から分離する酸化物層であって、前記第1の絶縁層から前記第2の絶縁層まで延びる酸化物層と、
前記第1型ドーパントを備える前記柱状の第1の領域の上側に設けられる前記第2型ドーパントを備える第1ボディ領域と、前記第1型ドーパントを備える前記柱状の第1の領域の上側に設けられる前記第2型ドーパントを備える第2ボディ領域と、
前記第1ボディ領域の上側に設けられる第1型ドーパントを備える第1ソース領域と、前記第2ボディ領域の上側に設けられる第1型ドーパントを備える第2ソース領域と、
前記第1の絶縁層の上側であって、前記第1ボディ領域と前記ゲート要素の間および前記第1ソース領域と前記ゲート要素の間に設けられる第3の絶縁層と、
前記第2の絶縁層の上側であって、前記第2ボディ領域と前記ゲート要素の間および前記第2ソース領域と前記ゲート要素の間に設けられる第4の絶縁層と、
前記第1型ドーパントを備える前記柱状の第1の領域の上側に形成されるトレンチであって、前記トレンチ内に形成されるソース金属に前記第1および第2ボディ領域と前記第1および第2ソース領域とを露出させ、前記トレンチが前記第1および前記第2ボディ領域にまで延び、前記第1ボディ領域の底部および前記第2ボディ領域の底部が前記トレンチの底部よりも低く、前記ソース金属が前記第1および第2ボディ領域と前記第1および第2ソース領域とに接触するトレンチと、
前記トレンチの底部に形成され、前記トレンチよりも幅が広く、前記トレンチ内の前記ソース金属を前記第1型ドーパントを備える前記柱状の第1の領域から分離する前記第2型ドーパントを備えるコンタクト領域と、
を備える半導体デバイス。 - 前記ソース金属は、前記第2型ドーパントの前記柱状領域に電気的に短絡される請求項8に記載の半導体デバイス。
- 前記トレンチは、前記第1型ドーパントの前記柱状の第1の領域の長手方向軸と位置合わせされる請求項8に記載の半導体デバイス。
- 第1型ドーパントのチャネルを有するスーパージャンクショントレンチパワー金属酸化膜半導体電界効果トランジスタ(MOSFET)デバイスを製造する方法であって、
第2型ドーパントを備えるカラムを前記第1型ドーパントの基板上に形成し、前記第2型ドーパントを備える前記カラムの直上に絶縁層を形成するステップと、
前記第2型ドーパントを備える前記カラムの両側および前記絶縁層の両側に第1の酸化物の第1の層を堆積させて、前記基板上に前記第1の酸化物の第1のカラムと前記基板上に前記第1の酸化物の第2のカラムとを形成するステップと、
前記第1の酸化物の前記第1のカラムに隣接して前記基板上に前記第1型ドーパントを備える第1のカラムを形成するとともに、前記第1の酸化物の前記第2のカラムに隣接して前記基板上に前記第1型ドーパントを備える第2のカラムを形成し、前記第2型ドーパントを備える前記カラムが、前記第1の酸化物の前記第1および第2のカラムによって、前記第1型ドーパントを備える前記第1および第2のカラムから分離され、前記第1型ドーパントを備える前記第1および第2のカラムが前記第2型ドーパントを備える前記カラムおよび前記絶縁層よりも高く延びて前記絶縁層の上側に第1トレンチを形成するステップと、
前記第1トレンチの側面および底部に第2の酸化物の第2の層を形成するステップと、
前記第1型ドーパントを備える前記第1のカラムの上側に前記第2型ドーパントを備えるボディ領域を形成するステップと、
前記ボディ領域の上側に前記第1型ドーパントを備えるソース領域を形成するステップと、
前記第1型ドーパントを備える前記第1のカラムの上側に前記ソース領域を貫通し前記ボディ領域に部分的に達する第2トレンチを形成し、前記ボディ領域が前記第2トレンチを越えて延びるステップと、
前記第2トレンチ内にソース金属を堆積させ、前記ソース金属が前記ボディ領域および前記ソース領域に接触するステップと、
前記第2トレンチよりも幅が広く、前記第2トレンチ内の前記ソース金属を前記第1型ドーパントを備える前記第1のカラムから分離する前記第2型ドーパントを備えるコンタクト領域を、前記第2トレンチの底部に形成するステップと、
を備える方法。 - 前記絶縁層の上側で前記第1トレンチ内にゲート要素を形成するステップをさらに備える請求項11に記載の方法。
- 前記第2型ドーパントを備える前記カラムを前記ソース金属の層に対して電気的に短絡させる電気接続部を形成するステップを更に備える請求項11または12に記載の方法。
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US8362550B2 (en) | 2011-01-20 | 2013-01-29 | Fairchild Semiconductor Corporation | Trench power MOSFET with reduced on-resistance |
US8466513B2 (en) | 2011-06-13 | 2013-06-18 | Semiconductor Components Industries, Llc | Semiconductor device with enhanced mobility and method |
US8633539B2 (en) | 2011-06-27 | 2014-01-21 | Infineon Technologies Austria Ag | Trench transistor and manufacturing method of the trench transistor |
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2009
- 2009-08-27 US US12/548,841 patent/US9425306B2/en active Active
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CN102549753B (zh) | 2015-02-25 |
WO2011031563A3 (en) | 2011-06-23 |
CN102549753A (zh) | 2012-07-04 |
JP2015039010A (ja) | 2015-02-26 |
WO2011031563A2 (en) | 2011-03-17 |
US20110049614A1 (en) | 2011-03-03 |
KR101407356B1 (ko) | 2014-06-13 |
EP2471101A4 (en) | 2014-03-05 |
KR20120094466A (ko) | 2012-08-24 |
US9425306B2 (en) | 2016-08-23 |
JP2013503491A (ja) | 2013-01-31 |
EP2471101A2 (en) | 2012-07-04 |
JP5687700B2 (ja) | 2015-03-18 |
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