JP7348842B2 - GaNスペーサ厚の均一性改善のために選択及び非選択エッチング層を用いたエンハンスメントモードGaNトランジスタ - Google Patents
GaNスペーサ厚の均一性改善のために選択及び非選択エッチング層を用いたエンハンスメントモードGaNトランジスタ Download PDFInfo
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- 125000006850 spacer group Chemical group 0.000 title claims description 25
- 239000000463 material Substances 0.000 claims description 43
- 230000004888 barrier function Effects 0.000 claims description 41
- 238000000034 method Methods 0.000 claims description 31
- 238000005530 etching Methods 0.000 claims description 17
- 229910002601 GaN Inorganic materials 0.000 description 54
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 44
- 229910002704 AlGaN Inorganic materials 0.000 description 21
- 230000008569 process Effects 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 235000012431 wafers Nutrition 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 5
- 150000004767 nitrides Chemical class 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000010287 polarization Effects 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 230000005669 field effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 229920002120 photoresistant polymer Polymers 0.000 description 2
- 229910003910 SiCl4 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 238000001020 plasma etching Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- FDNAPBUWERUEDA-UHFFFAOYSA-N silicon tetrachloride Chemical compound Cl[Si](Cl)(Cl)Cl FDNAPBUWERUEDA-UHFFFAOYSA-N 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Description
Claims (8)
- トランジスタゲートを取り囲む領域内に均一なスペーサ層を有するトランジスタを形成する方法であって、
以下によってトランジスタゲート構造を用意し、すなわち、
バリア層の上に、III-V族材料を有するスペーサ層を形成し、
前記スペーサ層の上に、p型III-V族材料を有する第1の層を形成し、
p型III-V族材料を有する前記第1の層の上に、p型Al含有III-V族材料を有するエッチングストップ層を形成し、
前記エッチングストップ層の上に、p型又は補償III-V族材料を有する第2の層を形成し、p型又は補償III-V族材料を有する該第2の層は、p型III-V族材料を有する前記第1の層よりも厚い、
ことによってトランジスタゲート構造を用意し、
p型又は補償III-V族材料を有する前記第2の層のゲート領域の上にマスクを位置付け、
エッチングが前記エッチングストップ層上で止まるよう、前記エッチングストップ層のp型Al含有III-V族材料に対して選択的であるエッチングレシピを用いて、前記ゲート領域の外側の、p型又は補償III-V族材料を有する前記第2の層の第1のエッチングを実行し、
前記マスクによって覆われた前記ゲート領域の外側で、前記エッチングストップ層と、p型III-V族材料を有する前記第1の層とが、完全にエッチングされるとともに、前記マスクによって覆われた前記ゲート領域の外側で、前記スペーサ層が部分的にエッチングされるように、前記エッチングストップ層のp型Al含有III-V族材料に対して選択的でないエッチングレシピを用いて、前記マスクを通して第2のエッチングを実行し、それにより、前記スペーサ層が、前記エッチングストップ層の下で、周囲領域でよりも厚く、前記周囲領域内の前記スペーサ層の厚さが実質的に均一であるようにされる、
ことを有する方法。 - 前記スペーサ層はGaNを有する、請求項1に記載の方法。
- 前記第1及び第2の層はpGaNを有し、前記エッチングストップ層はpAlGaN又はpAlInGaNを有する、請求項2に記載の方法。
- 前記第1及び第2の層はpAlGaN又はpAlInGaNを有し、前記第1及び第2の層のAl含有量は、前記エッチングストップ層のAl含有量よりも少ない、請求項2に記載の方法。
- 前記スペーサ層は1nm-6nmの厚さを有し、p型III-V族材料を有する前記第1の層は1nm-30nmの厚さを有し、前記エッチングストップ層は0.5nm-2nmの厚さを有し、p型又は補償III-V族材料を有する前記第2の層は20nm-100nmの厚さを有する、請求項1に記載の方法。
- 前記第2のエッチングは、前記スペーサ層が、前記ゲート領域の下で、前記ゲート領域の外側でよりも厚いことをもたらし、前記ゲート領域の外側の前記スペーサ層の厚さは実質的に均一である、請求項1に記載の方法。
- トランジスタゲートを取り囲む領域内に均一なスペーサ層を有するトランジスタを形成する方法であって、
トランジスタゲート構造を用意し、当該トランジスタゲート構造は、
バリア層と、
前記バリア層の上に配置されたスペーサ層であり、III-V族材料を有するスペーサ層と、
前記スペーサ層の上に配置された、p型又は補償III-V族材料を有する第1の層と、
前記スペーサ層とp型又は補償III-V族材料を有する前記第1の層との上に配置された、p型Al含有III-V族材料を有するエッチングストップ層と、
前記エッチングストップ層の上に位置付けられた、p型又は補償III-V族材料を有する第2の層であり、p型又は補償III-V族材料を有する前記第1の層よりも厚い第2の層と、
を有し、
p型又は補償III-V族材料を有する前記第2の層のゲート領域の上にマスクを位置付け、
エッチングが前記エッチングストップ層上で止まるよう、前記エッチングストップ層のp型Al含有III-V族材料に対して選択的であるエッチングレシピを用いて、前記ゲート領域の外側の、p型又は補償III-V族材料を有する前記第2の層の第1のエッチングを実行し、
前記マスクによって覆われた前記ゲート領域の外側で、前記エッチングストップ層と、p型又は補償III-V族材料を有する前記第1の層とが、完全にエッチングされるとともに、前記マスクによって覆われた前記ゲート領域の外側で、前記スペーサ層が部分的にエッチングされるように、前記エッチングストップ層のp型Al含有III-V族材料に対して選択的でないエッチングレシピを用いて、前記マスクを通して第2のエッチングを実行し、それにより、前記スペーサ層が、前記エッチングストップ層の下で、周囲領域でよりも厚く、前記周囲領域内の前記スペーサ層の厚さが実質的に均一であるようにされ、
前記トランジスタゲート構造は更に、p型又は補償III-V族材料を有する前記第2の層の上に配置された更なるエッチングストップ層と、該更なるエッチングストップ層の上に配置された、p型又は補償III-V族材料の更なる層と、を更に有し、前記バリア層と前記エッチングストップ層との間の構造の厚さが、前記エッチングストップ層と前記更なるエッチングストップ層との間の構造の厚さよりも小さく、前記更なるエッチングストップ層に対して更なるエッチングが実行されて、段階的エッチングをもたらす、
方法。 - 前記更なるエッチングストップ層は、前記エッチングストップ層とは異なるAl濃度及び/又は異なる厚さを有する、請求項7に記載の方法。
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US11978790B2 (en) * | 2020-12-01 | 2024-05-07 | Texas Instruments Incorporated | Normally-on gallium nitride based transistor with p-type gate |
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