JP6304199B2 - スイッチング素子 - Google Patents
スイッチング素子 Download PDFInfo
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- JP6304199B2 JP6304199B2 JP2015217791A JP2015217791A JP6304199B2 JP 6304199 B2 JP6304199 B2 JP 6304199B2 JP 2015217791 A JP2015217791 A JP 2015217791A JP 2015217791 A JP2015217791 A JP 2015217791A JP 6304199 B2 JP6304199 B2 JP 6304199B2
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- 229910002704 AlGaN Inorganic materials 0.000 claims description 14
- 239000012535 impurity Substances 0.000 claims description 13
- 230000005684 electric field Effects 0.000 description 40
- 239000004065 semiconductor Substances 0.000 description 25
- 230000015556 catabolic process Effects 0.000 description 18
- 239000000758 substrate Substances 0.000 description 18
- 230000000694 effects Effects 0.000 description 9
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000012141 concentrate Substances 0.000 description 4
- 230000012447 hatching Effects 0.000 description 4
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 3
- 229920005591 polysilicon Polymers 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 239000004047 hole gas Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 230000005533 two-dimensional electron gas Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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Description
本明細書または図面に説明した技術要素は、単独であるいは各種の組み合わせによって技術的有用性を発揮するものであり、出願時請求項記載の組み合わせに限定されるものではない。また、本明細書または図面に例示した技術は複数目的を同時に達成するものであり、そのうちの一つの目的を達成すること自体で技術的有用性を持つものである。
12 :半導体基板
14 :下地基板
16 :バッファ層
18 :電子走行層
19 :ヘテロ接合部
20 :電子供給層
22 :ソース電極
26 :p型層
30 :ドレイン電極
32 :ゲート電極
34 :抵抗層
40 :ソース配線
42 :ドレイン配線
Claims (8)
- スイッチング素子であって、
電子走行層と、
前記電子走行層上に位置しており、前記電子走行層にヘテロ接合している電子供給層と、
前記電子供給層に接しているソース電極と、
前記ソース電極から離れた位置で前記電子供給層に接しているドレイン電極と、
前記電子供給層の上部であって上側から平面視したときに前記ソース電極と前記ドレイン電極の間に位置している第1ゲート電極と、
前記電子供給層の上部であって、上側から平面視したときに前記第1ゲート電極と前記ドレイン電極の間に位置しており、前記第1ゲート電極及び前記ドレイン電極よりも抵抗率が高い抵抗層と、
第1絶縁層、
を有しており、
前記抵抗層を介して前記第1ゲート電極と前記ドレイン電極が電気的に繋がっており、
前記スイッチング素子のオン抵抗が、前記抵抗層を介して前記第1ゲート電極と前記ドレイン電極とを電気的に接続する経路の電気抵抗よりも低く、
前記抵抗層が、第1抵抗層と第2抵抗層を有し、
前記第1絶縁層が前記第1抵抗層を覆っており、
前記第2抵抗層が前記第1絶縁層上に位置しており、
上側から平面視したときに、前記第1抵抗層の一部と前記第2抵抗層の一部が重なっており、
前記第1抵抗層と前記第2抵抗層が重なる位置に、前記第1絶縁層を貫通して前記第1抵抗層と前記第2抵抗層とを接続しているコンタクトホールが位置しており、
前記抵抗層を介して前記第1ゲート電極と前記ドレイン電極とを電気的に接続する前記経路の少なくとも一部が、前記第1抵抗層、前記第2抵抗層及び前記コンタクトホールである、
スイッチング素子。 - 前記第2抵抗層が、上側から平面視したときに前記コンタクトホールが位置していない位置で前記第1抵抗層と重なる部分を有する請求項1のスイッチング素子。
- スイッチング素子であって、
電子走行層と、
前記電子走行層上に位置しており、前記電子走行層にヘテロ接合している電子供給層と、
前記電子供給層に接しているソース電極と、
前記ソース電極から離れた位置で前記電子供給層に接しているドレイン電極と、
前記電子供給層の上部であって上側から平面視したときに前記ソース電極と前記ドレイン電極の間に位置している第1ゲート電極と、
前記電子供給層の上部であって、上側から平面視したときに前記第1ゲート電極と前記ドレイン電極の間に位置しており、前記第1ゲート電極及び前記ドレイン電極よりも抵抗率が高い抵抗層、
を有しており、
前記抵抗層を介して前記第1ゲート電極と前記ドレイン電極が電気的に繋がっており、
前記スイッチング素子のオン抵抗が、前記抵抗層を介して前記第1ゲート電極と前記ドレイン電極とを電気的に接続する経路の電気抵抗よりも低く、
前記抵抗層を介して前記第1ゲート電極と前記ドレイン電極とを電気的に接続する前記経路が、前記ドレイン電極の周りを渦巻状に延びている、
スイッチング素子。 - スイッチング素子であって、
電子走行層と、
前記電子走行層上に位置しており、前記電子走行層にヘテロ接合している電子供給層と、
前記電子供給層に接しているソース電極と、
前記ソース電極から離れた位置で前記電子供給層に接しているドレイン電極と、
前記電子供給層の上部であって上側から平面視したときに前記ソース電極と前記ドレイン電極の間に位置している第1ゲート電極と、
前記電子供給層の上部であって、上側から平面視したときに前記第1ゲート電極と前記ドレイン電極の間に位置しており、前記第1ゲート電極及び前記ドレイン電極よりも抵抗率が高い抵抗層と、
前記電子供給層の上部であって、上側から平面視したときに前記第1ゲート電極と前記ドレイン電極の間に配置されている第2ゲート電極、
を有しており、
前記抵抗層を介して前記第1ゲート電極と前記ドレイン電極が電気的に繋がっており、
前記スイッチング素子のオン抵抗が、前記抵抗層を介して前記第1ゲート電極と前記ドレイン電極とを電気的に接続する経路の電気抵抗よりも低く、
前記第2ゲート電極が、前記抵抗層を介して前記第1ゲート電極と前記ドレイン電極とを電気的に接続する前記経路と繋がっており、
前記第1ゲート電極の電位が閾値よりも高いと、前記第1ゲート電極の下部と前記第2ゲート電極の下部の前記ヘテロ接合で2DEGが発生し、
前記第1ゲート電極の前記電位が前記閾値以下では、前記第1ゲート電極の下部と前記第2ゲート電極の下部の前記ヘテロ接合で2DEGが消滅する、
スイッチング素子。 - スイッチング素子であって、
電子走行層と、
前記電子走行層上に位置しており、前記電子走行層にヘテロ接合している電子供給層と、
前記電子供給層に接しているソース電極と、
前記ソース電極から離れた位置で前記電子供給層に接しているドレイン電極と、
前記電子供給層の上部であって上側から平面視したときに前記ソース電極と前記ドレイン電極の間に位置している第1ゲート電極と、
前記電子供給層の上部であって、上側から平面視したときに前記第1ゲート電極と前記ドレイン電極の間に位置しており、前記第1ゲート電極及び前記ドレイン電極よりも抵抗率が高い抵抗層と、
前記電子供給層の上部であって、上側から平面視したときに前記第1ゲート電極と前記ドレイン電極の間に配置されている第2ゲート電極と、
前記第1ゲート電極と前記電子供給層の間に位置しており、前記電子供給層に接している第1p型層と、
前記第2ゲート電極と前記電子供給層の間に位置しており、前記電子供給層に接している第2p型層、
を有しており、
前記抵抗層を介して前記第1ゲート電極と前記ドレイン電極が電気的に繋がっており、
前記スイッチング素子のオン抵抗が、前記抵抗層を介して前記第1ゲート電極と前記ドレイン電極とを電気的に接続する経路の電気抵抗よりも低く、
前記第2ゲート電極が、前記抵抗層を介して前記第1ゲート電極と前記ドレイン電極とを電気的に接続する前記経路と繋がっており、
前記スイッチング素子の動作時に、前記第2ゲート電極の電位が、前記第1ゲート電極の電位よりも高いとともに前記ドレイン電極の電位よりも低い電位となる、
スイッチング素子。 - スイッチング素子であって、
電子走行層と、
前記電子走行層上に位置しており、前記電子走行層にヘテロ接合している電子供給層と、
前記電子供給層に接しているソース電極と、
前記ソース電極から離れた位置で前記電子供給層に接しているドレイン電極と、
前記電子供給層の上部であって上側から平面視したときに前記ソース電極と前記ドレイン電極の間に位置している第1ゲート電極と、
前記電子供給層の上部であって、上側から平面視したときに前記第1ゲート電極と前記ドレイン電極の間に位置しており、前記第1ゲート電極及び前記ドレイン電極よりも抵抗率が高い抵抗層と、
前記電子供給層の上部であって、上側から平面視したときに前記第1ゲート電極と前記ドレイン電極の間に配置されている第2ゲート電極と、
前記第1ゲート電極と前記電子供給層の間に位置しており、前記電子供給層に接している第1p型層と、
前記第2ゲート電極と前記電子供給層の間に位置しており、前記電子供給層に接している第2p型層、
を有しており、
前記抵抗層を介して前記第1ゲート電極と前記ドレイン電極が電気的に繋がっており、
前記スイッチング素子のオン抵抗が、前記抵抗層を介して前記第1ゲート電極と前記ドレイン電極とを電気的に接続する経路の電気抵抗よりも低く、
前記第2ゲート電極が、前記抵抗層を介して前記第1ゲート電極と前記ドレイン電極とを電気的に接続する前記経路と繋がっており、
前記第2p型層と前記電子走行層の間の前記電子供給層の厚みが、前記第1p型層と前記電子走行層の間の前記電子供給層の厚みよりも厚い、
スイッチング素子。 - スイッチング素子であって、
電子走行層と、
前記電子走行層上に位置しており、前記電子走行層にヘテロ接合している電子供給層と、
前記電子供給層に接しているソース電極と、
前記ソース電極から離れた位置で前記電子供給層に接しているドレイン電極と、
前記電子供給層の上部であって上側から平面視したときに前記ソース電極と前記ドレイン電極の間に位置している第1ゲート電極と、
前記電子供給層の上部であって、上側から平面視したときに前記第1ゲート電極と前記ドレイン電極の間に位置しており、前記第1ゲート電極及び前記ドレイン電極よりも抵抗率が高い抵抗層と、
前記電子供給層の上部であって、上側から平面視したときに前記第1ゲート電極と前記ドレイン電極の間に配置されている第2ゲート電極と、
前記第1ゲート電極と前記電子供給層の間に位置しており、前記電子供給層に接している第1p型層と、
前記第2ゲート電極と前記電子供給層の間に位置しており、前記電子供給層に接している第2p型層、
を有しており、
前記抵抗層を介して前記第1ゲート電極と前記ドレイン電極が電気的に繋がっており、
前記スイッチング素子のオン抵抗が、前記抵抗層を介して前記第1ゲート電極と前記ドレイン電極とを電気的に接続する経路の電気抵抗よりも低く、
前記第2ゲート電極が、前記抵抗層を介して前記第1ゲート電極と前記ドレイン電極とを電気的に接続する前記経路と繋がっており、
前記第2p型層のp型不純物濃度が、前記第1p型層のp型不純物濃度よりも低い、
スイッチング素子。 - スイッチング素子であって、
電子走行層と、
前記電子走行層上に位置しており、前記電子走行層にヘテロ接合している電子供給層と、
前記電子供給層に接しているソース電極と、
前記ソース電極から離れた位置で前記電子供給層に接しているドレイン電極と、
前記電子供給層の上部であって上側から平面視したときに前記ソース電極と前記ドレイン電極の間に位置している第1ゲート電極と、
前記電子供給層の上部であって、上側から平面視したときに前記第1ゲート電極と前記ドレイン電極の間に位置しており、前記第1ゲート電極及び前記ドレイン電極よりも抵抗率が高い抵抗層と、
前記電子供給層の上部であって、上側から平面視したときに前記第1ゲート電極と前記ドレイン電極の間に配置されている第2ゲート電極、
を有しており、
前記抵抗層を介して前記第1ゲート電極と前記ドレイン電極が電気的に繋がっており、
前記スイッチング素子のオン抵抗が、前記抵抗層を介して前記第1ゲート電極と前記ドレイン電極とを電気的に接続する経路の電気抵抗よりも低く、
前記第2ゲート電極が、前記抵抗層を介して前記第1ゲート電極と前記ドレイン電極とを電気的に接続する前記経路と繋がっており、
前記電子供給層が、AlGaNであり、
前記第2ゲート電極の下部の前記電子供給層のAl/Ga比率が、前記第1ゲート電極の下部の前記電子供給層のAl/Ga比率よりも高い、
スイッチング素子。
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