JP2010515279A - Iii族窒化物素子のための活性領域成形およびその製造方法 - Google Patents
Iii族窒化物素子のための活性領域成形およびその製造方法 Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 150000004767 nitrides Chemical class 0.000 title claims description 52
- 238000000465 moulding Methods 0.000 title 1
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000002161 passivation Methods 0.000 claims abstract description 13
- 239000004065 semiconductor Substances 0.000 claims abstract description 13
- 239000012212 insulator Substances 0.000 claims description 30
- 229910002704 AlGaN Inorganic materials 0.000 claims description 5
- 238000005530 etching Methods 0.000 claims description 5
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 4
- 238000000151 deposition Methods 0.000 claims description 4
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 4
- 230000005533 two-dimensional electron gas Effects 0.000 claims description 3
- 230000015556 catabolic process Effects 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 229910004205 SiNX Inorganic materials 0.000 description 2
- -1 but not limited to Inorganic materials 0.000 description 2
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 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
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Abstract
Description
この出願は、2007年1月10日に出願され、III族窒化物素子のための活性領域成形およびその製造方法(Active Area Shaping for III-Nitride Device and Process for its Manufacture)と題される米国仮出願番号第60/884,272号に基づいてその利益を主張し、その優先権をここで主張し、その開示を引用により援用する。
この発明は、半導体素子に関し、より具体的には、III族窒化物系半導体素子およびその製造方法に関する。
III族窒化物とは、GaN、AlGaN、InGaN、AlN、InN、InAlGaNなどを含むがこれに限定されないInAlGaN系の半導体合金を指す。
図1を参照して、知られているIII族窒化物ヘテロ接合型パワー半導体素子は、基板10と、基板10の上に形成されたIII族窒化物(たとえばAlN)バッファ層12と、バッファ層12の上に形成されたIII族窒化物ヘテロ接合14とを含む。III族窒化物ヘテロ接合14は、あるバンドギャップの第1のIII族窒化物体(たとえばGaN)16と、第1のIII族窒化物体16の上に形成された別のバンドギャップの第2のIII族窒化物体(たとえばAlGaN)18とを含む。第1のIII族窒化物体16および第2のIII族窒化物体18の組成は、この2つの窒化物体のヘテロ接合にまたはその近くに、二次元電子ガス(2−DEG)と呼ばれるキャリアで満ちている領域の形成をもたらすよう選択される。2−DEGは、第1の電源電極(たとえばソース電極)20と第2の電源電極(たとえばドレイン電極)22との間の伝導チャネルとして働く。なお、典型的に、各電源電極20、22は、第2のIII族窒化物体18にオーミック結合されており、よって第2のIII族窒化物体を通じて2−DEGに電気的に結合されている。
であろう。
この発明に従って、ゲートを収容するトレンチまたはウェルは、その角にレッジ(ledge)を含む。角にあるレッジは、素子の降伏電圧を上昇させ、ゲート−ドレイン間容量を最小化してQgdを低減する。
図2を参照して、図中、同様の番号は同様の特徴を識別し、この発明に従うIII族窒化物パワーヘテロ接合素子は、第2のIII族窒化物体18にある第1の孔口38と、第1の孔口38よりも幅が広くパッシベーション体34の最上面にある第2の孔口40とを有するゲートウェル(トレンチ)36を含むパッシベーション体34を含む。なお、好ましくは、ゲートウェル36は、電源電極20、22と並列に延在するストライプ形状トレンチである。よって、好ましい実施例におけるゲート26は、第1の孔口38で第2のIII族窒化物体18の上に配置されたゲートウェル36の側壁に沿って延在するゲート誘電体30と、ゲートウェル36の内側でゲート誘電体30の上に配置されたゲート電極32とを含む。よって、この発明の1つの局面に従って、第2のIII族窒化物体18の上でゲート26が重なる面積は減少し、これによりQgdは低減する。
されてもよい。たとえば、レッジ42′は、約0.025μmであってもよく、レッジ42″は、幅0.05−0.1μmの範囲内であってもよく、各レッジの幅は、ゲートウェル36の内側の横方向寸法として規定されている。
Claims (20)
- III族窒化物半導体素子であって、
あるバンドギャップを有する第1のIII族窒化物体と、別のバンドギャップを有し前記第1のIII族窒化物体の上に配置された第2のIII族窒化物体とを含み、二次元電子ガスを形成しているIII族窒化物ヘテロ接合と、
前記第2のIII族窒化物体の上に形成されたパッシベーション体とを備え、前記パッシベーション体は、前記第2のIII族窒化物体側にある第1の孔口と、前記第1の孔口よりも幅が広く前記パッシベーション体の最上部にある第2の孔口とを有するゲートウェルを含み、
前記ゲートウェルの少なくとも部分的に内部に配置されたゲート配置部をさらに備え、前記ゲート配置部は、前記ウェルの前記第1の孔口に配置されたゲート絶縁体と、前記ゲート絶縁体の上にあるゲート電極とを含む、III族窒化物体半導体素子。 - 前記ウェルは、前記ウェルの前記第1の孔口を規定するレッジを各々有し対向する側壁を含む、請求項1に記載の素子。
- 前記レッジのうち一方は、前記レッジの他方よりも幅が広い、請求項2に記載の素子。
- 前記ゲート配置部のそれぞれの側方にドレイン電極とソース電極とをさらに備え、前記レッジのうち前記一方は、前記ソース電極より前記ドレイン電極の近くにある、前記ゲートウェルの側壁にある、請求項2に記載の素子。
- 前記レッジは窒化シリコンからなる、請求項2に記載の素子。
- 前記パッシベーション体は、前記第2のIII族窒化物体の上にある第1の絶縁体と、前記第1の絶縁体の上にある第2の絶縁体とを含む、請求項1に記載の素子。
- 前記第1の絶縁体は窒化シリコンからなり、前記第2の絶縁体は窒化物誘電体からなる、請求項6に記載の素子。
- 前記第2の絶縁体はAlNからなる、請求項7に記載の素子。
- 前記第2の絶縁体はTiNからなる、請求項7に記載の素子。
- 前記第1のIII族窒化物体はGaNからなり、前記第2のIII族窒化物体はAlGaNからなる、請求項1に記載の素子。
- III族窒化物素子の製造方法であって、
あるバンドギャップを有する第1のIII族窒化物体と、別のバンドギャップを有し二次元電子ガスを形成するために前記第1のIII族窒化物体の上に配置された第2のIII族窒化物体とを含むIII族窒化物ヘテロ接合の上に第1の絶縁体を堆積するステップと、
第2の絶縁体を前記第1の絶縁体の上に堆積するステップと、
前記第1および第2の絶縁体を貫いてトレンチを形成するステップとを備え、前記トレンチは、前記第2のIII族窒化物体側にある第1の孔口と、前記第2の絶縁体の最上部にある第2の孔口とを含み、
前記第1の孔口よりも幅が広くなるように前記第2の孔口を広げるため、前記第2の絶縁体を除去するよう前記トレンチの側壁をエッチングするステップをさらに備える、方法。 - 前記第1の絶縁体は窒化シリコンからなり、前記第2の絶縁体は窒化物誘電体からなる、請求項11に記載の方法。
- 前記第2の絶縁体はAlNからなる、請求項12に記載の方法。
- 前記第2の絶縁体はTiNからなる、請求項12に記載の方法。
- 前記第1のIII族窒化物体はGaNからなり、前記第2のIII族窒化物体はAlGaNからなる、請求項11に記載の方法。
- 前記トレンチにゲート配置部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。
- 前記ゲート配置部は、前記第2のIII族窒化物体の上にあるゲート誘電体と、前記ゲート誘電体の上にあるゲート電極とを含む、請求項16に記載の方法。
- 前記エッチングするステップは、前記ウェルの前記第1の孔口を規定するレッジを各々有する側壁をもたらす、請求項16に記載の方法。
- 前記レッジのうち一方は、前記レッジの他方よりも幅が広い、請求項18に記載の方法。
- 前記ゲート配置部のそれぞれの側方にドレイン電極とソース電極とを形成するステップをさらに備え、前記レッジの前記一方は、前記ソース電極より前記ドレイン電極の近くに位置する、前記ゲート配置部の側方にある、請求項19に記載の方法。
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