JP2006080513A - 半導体素子のための非活性化保護リング - Google Patents
半導体素子のための非活性化保護リング Download PDFInfo
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- JP2006080513A JP2006080513A JP2005253739A JP2005253739A JP2006080513A JP 2006080513 A JP2006080513 A JP 2006080513A JP 2005253739 A JP2005253739 A JP 2005253739A JP 2005253739 A JP2005253739 A JP 2005253739A JP 2006080513 A JP2006080513 A JP 2006080513A
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 208
- 229910052751 metal Inorganic materials 0.000 claims abstract description 120
- 239000002184 metal Substances 0.000 claims abstract description 120
- 238000000137 annealing Methods 0.000 claims abstract description 8
- 239000000758 substrate Substances 0.000 claims description 52
- 238000002513 implantation Methods 0.000 claims description 37
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 claims description 25
- 229910002601 GaN Inorganic materials 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 24
- 238000005468 ion implantation Methods 0.000 abstract description 12
- 150000004767 nitrides Chemical class 0.000 description 24
- 230000015572 biosynthetic process Effects 0.000 description 19
- 239000000463 material Substances 0.000 description 17
- 238000005530 etching Methods 0.000 description 11
- 239000002019 doping agent Substances 0.000 description 10
- 150000002500 ions Chemical class 0.000 description 9
- 238000000059 patterning Methods 0.000 description 9
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 9
- 230000001681 protective effect Effects 0.000 description 7
- 230000004888 barrier function Effects 0.000 description 6
- 239000007943 implant Substances 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- 239000010931 gold Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 230000005684 electric field Effects 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
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- 229910052733 gallium Inorganic materials 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 238000002488 metal-organic chemical vapour deposition Methods 0.000 description 3
- 230000006911 nucleation Effects 0.000 description 3
- 238000010899 nucleation Methods 0.000 description 3
- 229910052697 platinum Inorganic materials 0.000 description 3
- 238000005546 reactive sputtering Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
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- 238000003877 atomic layer epitaxy Methods 0.000 description 2
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- 238000001451 molecular beam epitaxy Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000001020 plasma etching Methods 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
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- 229910021529 ammonia Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- 229910052732 germanium Inorganic materials 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 150000002902 organometallic compounds Chemical class 0.000 description 1
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- 230000000717 retained effect Effects 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000001039 wet etching Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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Abstract
【解決手段】 保護リングは、ショットキー接合又はショットキーダイオードの一部である半導体領域に形成される。保護リングは、高抵抗領域を形成するために、半導体コンタクト層を完全にアニール処理することなく半導体コンタクト層内へのイオン注入によって形成される。保護リングは、層のエッジ部か又は代替的に層のエッジ部からある一定距離を離して位置することができる。ショットキー金属接点は、層の上に形成され、ショットキー接点のエッジ部は、保護リングの上に配置される。
【選択図】 図1
Description
半導体構造体は、本発明の別の態様によるものである。半導体本体は、少なくともコンタクト層を含む。コンタクト層の少なくとも1つの部分に、少なくとも1つの保護リングが形成される。保護リングは、少なくとも注入イオン種を有しかつショットキー金属接点のエッジ部が配置されたコンタクト層の表面の一部分に少なくとも隣接して配置される注入領域を含む。注入領域は、不完全にアニール処理される。
ショットキー接合を半導体構造体に形成することができ、これによって、本発明の先の態様に従って保護リングが半導体構造体に形成され、金属接点層がコンタクト層の少なくとも一部の上に形成されてそれとのショットキー接合を形成する。
本発明の先の態様に従って、ショットキーダイオードを形成することができ、これによって、基板の表面上に少なくとも1つの半導体層が形成されてコンタクト層を少なくとも含み、半導体本体は、シリコン基板とこの少なくとも1つの半導体層を含み、ショットキーダイオードは、コンタクト層の少なくとも一部の上に形成された金属接点を更に含み、それとのショットキー接合を形成する。少なくとも1つの更に別の金属接点を、コンタクト層上にそれと実質的にオーム接触するように形成することができる。
基板は、絶縁材料とすることができ、又は半導体とすることもできる。少なくとも1つの更に別の金属接点を、基板の別の表面上にそれと実質的にオーム接触するように形成することができる。
金属接点を形成する前に、半導体層の少なくとも1つの領域をパターン化及びエッチングし、半導体本体に少なくとも1つのより低い接触面と少なくとも1つのメサとを形成することができ、メサは、この更に別の表面から上方に突出してドープ領域を少なくとも含み、ショットキー接点は、メサの上に形成され、少なくとも1つのイオン種を注入する前に、少なくとも1つの更に別の金属接点が、より低い接触面上にそれと実質的にオーム接触するように形成され、この少なくとも1つのイオン種の注入を更にマスキングする。
本発明の更に別の態様は、上述の方法で形成されるショットキーダイオードを含む。
本発明の上述の態様、特徴、及び利点は、好ましい実施形態の以下の説明及び添付図面を参照して考察した時に更に評価されるであろう。
保護リングは、半導体層108への1つ又はそれ以上のイオン種の注入によって形成される高抵抗領域である。しかし、注入イオン種は、アニール処理のようなその後の処理中に活性化されず、その結果、イオン注入によって導入された表面電荷は、層108の上面に留まることになる。
イオンが注入されたものであるが非活性化された保護リング122は、メサのエッジ部から所定の距離分だけ、一般的に1から10μmだけずれた層108内に形成される。保護リング層122の上部は、半導体層108の上部に又はその近くに位置することになる。ショットキー金属接点110とポンドパッド金属層112は、ショットキー金属接点のエッジ部が保護リングを覆うように又は保護リングのエッジ部に位置するように図1に示す対応する層よりも長さが短く、その結果、保護リングは、素子150が逆バイアスされた時にショットキー金属接点のエッジ部に存在する高い電界を最小限に抑えるものである。
図3Aは、1つ又はそれ以上の更に別の層が形成される基板の上に形成される半導体構造体の断面を示すものである。基板302は、理想的には基板の上に成長することになる半導体金属の格子間隔に等しいか又はほぼ等しい格子間隔(結晶格子内の隣接原子間の間隔)を有する。これによって、結晶格子内の変位のような半導体内に形成される欠陥の数が少なくなる。また、このような半導体層の成長後に半導体材料が冷却された時に、基板の方が半導体層よりも収縮量が大きく、その結果半導体層が圧縮されて層内の割れの形成が回避されるように、基板は、半導体材料の熱膨張率に少なくとも等しい熱膨張率を有することが非常に望ましい。
形成された素子が垂直方向に導通するショットキーダイオードである時は、半導体層308のパターン化及びエッチング段階は省略することができる。
代替的に、形成された素子が垂直方向に導通するショットキーダイオードである時は、オーム金属接点を基板302の裏側に形成する。
更なる代替として、形成された素子が1つ又はそれ以上のショットキー接合を組み込む別の素子である時には、他の処理段階が続く場合がある。
図4Aは、任意的な緩衝層304、ドープ量の多い半導体層306、及び半導体コンタクト層308が形成された基板302を含む半導体構造体の断面を示すものである。図3Aに関連して上述した材料の1つで基板302を形成することができ、上述の方法で緩衝層304、及び層306及び308を同様に形成することができる。
図5Aは、上述の基板302、任意的な緩衝層304、ドープ量の多い半導体層306、及び半導体層308を含む半導体構造体の断面を示すものである。基板302は、図3Aに関連して上述した材料の1つで形成することができ、緩衝層304、及び層306及び308は、上述の方法で同様に形成することができる。また、半導体構造体は、上述の方法で層308の1つ又はそれ以上のメサの上に形成されたショットキー金属接点310、並びに上述の方法でドープ量の多い半導体層306の1つ又はそれ以上の領域の上に形成されたオーム接点を含む。この時点で、ショットキー金属接点310とオーム金属接点316の上に、それぞれボンドパッド金属層312及び318を形成することもできる。
層508のメサの少なくともいくつかの間で及び/又はメサの外側でドープ量の多い層506の上にオーム金属接点516を設置する。オーム金属接点は、メサのいくつか又は全てを少なくとも部分的に取り囲むか又は完全に取り囲むことができる。オーム金属接点516の上にボンドパッド金属層518を形成する。
半導体層508のメサのエッジ部に又はその近くに保護リング520を配置する。保護リングは、図3Aから図3Cを参照して上述したように層508のエッチング後、図4A及び図4Bを参照して上述したように層のエッチング前、又は、図5A及び図5Bを参照して上述したようにショットキー金属接点及びオーム金属接点の形成後に形成することができる。
本発明を本明細書で特定的な実施形態を参照して説明したが、これらの実施形態は、本発明の原理及び用途を単に例示するものであることは理解されるものとする。従って、例示的な実施形態に対して多くの変更を行うことができ、特許請求の範囲によって規定された本発明の精神及び範囲から逸脱することなく、他の構成を考案することができることも理解されるものとする。
102 絶縁基板
104 緩衝構造体
106 半導体層
108 半導体コンタクト層
110 ショットキー金属接点
112 ポンドパッド金属層
Claims (18)
- 半導体構造体に保護リングを形成する方法であって、
コンタクト層を含む半導体本体を準備する段階と、
少なくとも1つのイオン種を前記コンタクト層の少なくとも1つの部分の中に注入し、そこに、ショットキー金属接点のエッジ部が配置されているか又は配置される該コンタクト層の表面の一部分に少なくとも隣接して配置される少なくとも1つの注入領域を形成する段階と、
続いて、前記注入領域を完全にアニール処理することなく前記半導体本体を処理する段階と、
を含むことを特徴とする方法。 - 前記イオン種は、1回に少なくとも5E12cm-2の量で注入されることを特徴とする請求項1に記載の方法。
- 前記イオン種は、1回に最大1E16cm-2の量で注入されることを特徴とする請求項1に記載の方法。
- 前記イオン種は、前記コンタクト層の前記表面に対してゼロ傾斜角で注入されることを特徴とする請求項1に記載の方法。
- 前記コンタクト層は、窒化ガリウムベースの半導体を含むことを特徴とする請求項1に記載の方法。
- 請求項1に記載の保護リングを形成する段階を含むショットキーダイオードを形成する方法であって、
半導体本体を準備する段階は、少なくとも1つの半導体層を基板の表面上に形成する段階を含み、
前記半導体層は、コンタクト層を少なくとも含み、それによって前記半導体本体は、前記基板と前記少なくとも1つの半導体層を含み、
金属接点を前記コンタクト層の少なくとも一部の上に形成し、それとのショットキー接合を形成する段階、
を更に含むことを特徴とする方法。 - 請求項1に記載の保護リングを形成する段階を含む方法により形成されたショットキーダイオードであって、
半導体本体を準備する段階は、少なくとも1つの半導体層を基板の表面上に形成する段階を含み、
前記半導体層は、コンタクト層を少なくとも含み、それによって前記半導体本体は、前記基板と前記少なくとも1つの半導体層を含み、
少なくとも1つのイオン種を注入する前に、金属接点を前記コンタクト層の少なくとも一部の上に形成し、それとのショットキー接合を形成する段階、
を更に含み、
前記金属接点は、前記注入される領域が該金属接点に対して自己整列するように、前記少なくとも1つのイオン種の前記注入をマスキングする、
ことを特徴とするダイオード。 - 少なくとも1つのコンタクト層を含む半導体本体と、
少なくとも1つの注入されたイオン種を有する注入領域を含み、前記コンタクト層の少なくとも一部分に形成された少なくとも1つの保護リングと、
を含み、
前記注入領域は、ショットキー金属接点のエッジ部が配置された前記コンタクト層の表面の一部分に少なくとも隣接して配置され、かつ不完全にアニール処理される、
ことを特徴とする半導体構造体。 - 前記注入領域は、前記コンタクト層の前記表面に隣接することを特徴とする請求項8に記載の半導体構造体。
- 前記注入領域の端部は、前記ショットキー金属接点の前記エッジ部に接触することを特徴とする請求項8に記載の半導体構造体。
- 前記注入領域の端部は、前記コンタクト層のエッジ部に位置することを特徴とする請求項8に記載の半導体構造体。
- 前記注入領域は、前記コンタクト層のエッジ部から少なくとも1μm離れて位置することを特徴とする請求項8に記載の半導体構造体。
- 前記注入領域は、前記コンタクト層の前記エッジ部から最大10μm離れて位置することを特徴とする請求項12に記載の半導体構造体。
- 前記イオン種の1回の注入量は、少なくとも5E12cm-2であることを特徴とする請求項8に記載の半導体構造体。
- 前記イオン種の1回の注入量は、最大1E16cm-2であることを特徴とする請求項8に記載の半導体構造体。
- 前記注入領域は、完全な非アニール処理領域であることを特徴とする請求項8に記載の半導体構造体。
- 前記半導体本体は、更に別の表面を形成し、かつ該更に別の表面から上方に突出した少なくとも1つのメサを含み、該メサは、前記コンタクト層の少なくとも一部を含むことを特徴とする請求項8に記載の半導体構造体。
- 前記コンタクト層は、窒化ガリウムベースの半導体を含むことを特徴とする請求項8に記載の半導体構造体。
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Cited By (4)
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JP2014110310A (ja) * | 2012-11-30 | 2014-06-12 | Furukawa Electric Co Ltd:The | 窒化物系化合物半導体装置およびその製造方法 |
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US7229866B2 (en) | 2007-06-12 |
EP1633004A3 (en) | 2008-03-05 |
JP2013042183A (ja) | 2013-02-28 |
TWI421917B (zh) | 2014-01-01 |
US20050202661A1 (en) | 2005-09-15 |
EP1633004A2 (en) | 2006-03-08 |
JP5164319B2 (ja) | 2013-03-21 |
EP1633004B1 (en) | 2013-08-14 |
EP2302686A3 (en) | 2011-04-13 |
TW200633030A (en) | 2006-09-16 |
EP2302686A2 (en) | 2011-03-30 |
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