JP7061644B2 - 高電圧半導体素子及びその素子を製造する方法 - Google Patents
高電圧半導体素子及びその素子を製造する方法 Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 239000004065 semiconductor Substances 0.000 title description 19
- 239000010410 layer Substances 0.000 claims description 143
- 229910052751 metal Inorganic materials 0.000 claims description 78
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 20
- 238000010586 diagram Methods 0.000 description 15
- 238000002347 injection Methods 0.000 description 15
- 239000007924 injection Substances 0.000 description 15
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 14
- 229910010271 silicon carbide Inorganic materials 0.000 description 14
- 238000009792 diffusion process Methods 0.000 description 10
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 6
- 229910052719 titanium Inorganic materials 0.000 description 6
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 6
- 229910052721 tungsten Inorganic materials 0.000 description 6
- 239000010937 tungsten Substances 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 5
- 230000005684 electric field Effects 0.000 description 5
- 230000000873 masking effect Effects 0.000 description 5
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 4
- 239000007943 implant Substances 0.000 description 4
- 238000005468 ion implantation Methods 0.000 description 4
- 238000000059 patterning Methods 0.000 description 4
- 125000006850 spacer group Chemical group 0.000 description 4
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- 230000015556 catabolic process Effects 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 238000000206 photolithography Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
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- 238000005498 polishing Methods 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
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- YWHLKYXPLRWGSE-UHFFFAOYSA-N Dimethyl trisulfide Chemical compound CSSSC YWHLKYXPLRWGSE-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- -1 but not limited to Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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Description
複数のMOSFETセルと、
n型ショットキー領域と、
ソース金属層と、
ショットキー金属層と、を備え、
MOSFETセルの各々は、
第一及び第二p型ウェル領域と、
n型JFET領域と、
第一及び第二n型ソース領域と、
ソースオーム接点と、
ゲート誘電層と、
ゲート層と、
層間絶縁膜層と、
第一及び第二p型本体接触領域と、を備え、
上記第一及び第二p型ウェル領域は、上記n型ドリフト層上において間隔を置いて設置される関係にあり、
上記n型JFET領域は、上記第一及び第二p型ウェル領域間の上記n型ドリフト層上にあり、
上記第一及び第二p型ウェル領域の各々は、上記JFET領域に隣接したチャネル領域を備え、
上記第一及び第二n型ソース領域は、上記第一及び第二p型ウェル領域の各々上にあり且つ上記JFET領域とは反対側の上記チャネル領域に隣接しており、
上記第一及び第二n型ソース領域は、上記n型ドリフト層よりもドーパント濃度が高く、
上記ソースオーム接点は、上記第一及び第二n型ソース領域の各々上にあり、
上記ゲート誘電層は、上記JFET領域及びチャネル領域上にあり、
上記ゲート層は、上記ゲート誘電層上にあり、
上記層間絶縁膜層は、上記ゲート層上にあり、
上記第一及び第二p型本体接触領域は、上記n型ドリフト層上にあり且つ上記チャネル領域とは反対側の第一及び第二n型ソース領域に隣接しており、
上記第一及び第二p型本体接触領域は、上記第一及び第二p型ウェル領域よりもドーパント濃度が高く、
上記n型ショットキー領域は、1又は複数の上記MOSFETセルに近接する上記n型ドリフト層上にあり、
上記ソース金属層は、上記ソースオーム接点上にあり且つそれと接触し、
上記ショットキー金属層は、上記n型ショットキー領域上にあり且つそれと接触し、
上記ショットキー金属層は、上記n型ショットキー領域とのショットキー接点を形成している、
マルチセルMOSFET素子を提供する。
n型ソース領域形成工程と、
第一及び第二p型本体接触領域形成工程と、
ゲート酸化層蒸着工程と、
ゲート層蒸着工程と、
層間絶縁膜素材蒸着工程と、
ソースオーム接点形成工程と、
ソース金属層蒸着工程と、
金属蒸着形成工程と、を有し、
上記p型ウェル領域形成工程において、n型ドリフト層に第一及び第二p型ウェル領域を形成し、
上記n型ドリフト層は、n型基板上にあり、
上記第一及び第二p型ウェル領域は、互いに離れるように間隔を置いて設置され、その間にn型ショットキー領域を形成し、
第一及び第二ウェル領域の各々に隣接し且つ上記n型ショットキー領域とは反対側の上記ドリフト層のn型領域は、第一及び第二JFET領域を形成し、
上記n型ソース領域形成工程において、上記第一及び第二p型ウェル領域の各々にn型ソース領域を形成し、
上記n型ソース領域は、上記第一及び第二JFET領域から間隔を置いて配置され、上記n型ソース領域と上記JFET領域との間にp型チャネル領域を残し、
上記第一及び第二p型本体接触領域形成工程において、上記ショットキー領域と上記第一及び第二p型ウェル領域の各々との間に第一及び第二p型本体接触領域をそれぞれ形成し、
上記ゲート酸化層蒸着工程において、上記第一及び第二JFET領域上に且つチャネル領域に隣接してゲート酸化層を蒸着し、
上記ゲート層蒸着工程において、上記ゲート酸化層上にゲート層を蒸着し、
上記層間絶縁膜素材蒸着工程において、上記ゲート層上に層間絶縁膜素材を蒸着し、
上記ソースオーム接点形成工程において、上記ソース領域上にソースオーム接点を形成し、
上記ソース金属層蒸着工程において、上記ソースオーム接点上に且つ上記n型ショットキー領域上にソース金属層を蒸着し、
上記ソース金属層は、上記n型ショットキー領域との上記ショットキー接点を形成し、
上記金属蒸着形成工程において、上記ソース金属層上に最終金属を蒸着する、
マルチセルMOSFET素子を製造する方法も提供する。
第一及び第二p型ウェル領域形成工程と、
n型ソース領域形成工程と、
第一及び第二p型本体接触領域形成工程と、
誘電体材料蒸着工程と、
ゲート酸化層蒸着工程と、
ゲート層蒸着工程と、
層間絶縁膜素材蒸着工程と、
ソースオーム接点形成工程と、
ソース金属層蒸着工程と、
金属蒸着工程と、を有し、
上記n型ドリフト層エッチング工程において、n型ドリフト層をエッチングして底部及び側壁を有する第一及び第二開口部を形成し、
上記n型ドリフト層は、n型基板上にあり、
上記第一及び第二開口部は、互いに離れるように間隔を置いて設置され、その間にn型ショットキー領域を形成し、
上記第一及び第二p型ウェル領域形成工程において、上記第一及び第二開口部に隣接したn型ドリフト層に第一及び第二p型ウェル領域をそれぞれ形成し、
上記第一及び第二p型ウェル領域は、上記n型ショットキー領域とは反対側に形成され、
上記第一及び第二ウェル領域に隣接した上記ドリフト層のn型領域は、第一及び第二JFET領域を形成し、
上記n型ソース領域形成工程において、上記第一及び第二p型ウェル領域の各々にn型ソース領域を形成し、
上記n型ソース領域は、上記第一及び第二JFET領域から間隔を置いて配置され、上記n型ソース領域と上記JFET領域との間にp型チャネル領域を残し、
上記第一及び第二p型本体接触領域形成工程において、第一及び第二開口部の上記底部及び側壁に隣接して第一及び第二p型本体接触領域を形成し、
上記誘電体材料蒸着工程において、上記第一及び第二開口部に誘電体材料を蒸着し、
上記ゲート酸化層蒸着工程において、上記第一及び第二JFET領域上に且つチャネル領域に隣接してゲート酸化層を蒸着し、
上記ゲート層蒸着工程において、上記ゲート酸化層上にゲート層を蒸着し、
上記層間絶縁膜素材蒸着工程において、上記ゲート層上に層間絶縁膜素材を蒸着し、
上記ソースオーム接点形成工程において、上記ソース領域上にソースオーム接点を形成し、
上記ソース金属層蒸着工程において、上記ソースオーム接点上に且つ上記n型ショットキー領域にソース金属層を蒸着し、
上記ソース金属層は、上記n型ショットキー領域とのショットキー接点を形成し、
上記金属蒸着工程において、上記ソース金属層上に最終的な金属を蒸着する、
マルチセルMOSFET素子を製造する方法も提供する。
Claims (12)
- マルチセルMOSFET素子であって、
前記マルチセルMOSFET素子は、
n型基板上のn型ドリフト層と、
複数のMOSFETセルと、
1又は複数のn型ショットキー領域と、
ソース金属層と、
ショットキー金属層と、を備え、
前記複数のMOSFETセルの各々は、
第一及び第二p型ウェル領域と、
n型JFET領域と、
第一及び第二n型ソース領域と、
ソースオーム接点と、
ゲート誘電層と、
ゲート層と、
層間絶縁膜層と、
第一及び第二p型本体接触領域と、を備え、
前記第一及び第二p型ウェル領域は、前記n型ドリフト層上において間隔を置いて設置される関係にあり、
前記n型JFET領域は、前記第一及び第二p型ウェル領域間の前記n型ドリフト層上にあり、
前記第一及び第二p型ウェル領域の各々は、前記JFET領域に隣接したチャネル領域を備え、
前記第一及び第二n型ソース領域は、前記第一及び第二p型ウェル領域の各々上にあり且つ前記JFET領域とは反対側の前記チャネル領域に隣接しており、
前記第一及び第二n型ソース領域は、前記n型ドリフト層よりもドーパント濃度が高く、
前記ソースオーム接点は、前記第一及び第二n型ソース領域の各々上にあり、
前記ゲート誘電層は、前記JFET領域及びチャネル領域上にあり、
前記ゲート層は、前記ゲート誘電層上にあり、
前記層間絶縁膜層は、前記ゲート層上にあり、
前記第一及び第二p型本体接触領域は、前記n型ドリフト層上にあり且つ前記チャネル領域とは反対側の第一及び第二n型ソース領域に隣接しており、
前記第一及び第二p型本体接触領域は、前記第一及び第二p型ウェル領域よりもドーパント濃度が高く、
前記1又は複数のn型ショットキー領域は、1又は複数の前記MOSFETセルに近接する前記n型ドリフト層上にあり、
前記ソース金属層は、前記ソースオーム接点上にあり且つそれと接触し、及び、前記1又は複数のn型ショットキー領域上にあり且つそれと接触し、
前記ソース金属層は、前記1又は複数のn型ショットキー領域とのショットキー接点を形成し、
前記1又は複数のn型ショットキー領域の各々は、隣接するセルの前記p型本体接触領域に隣接し且つその間に存在し、
前記ゲート層は、前記素子の平面において前記JFET領域及び隣接するチャネル領域に延在すし、
前記マルチセルMOSFET素子は、前記ソースオーム接点及び前記1又は複数のn型ショットキー領域上に誘電体材料を備え、
前記素子は、
前記ソースオーム接点上に前記誘電体材料を通じて形成された1又は複数のソースビアと、
前記1又は複数のn型ショットキー領域上に前記誘電体材料を通じて形成された1又は複数のショットキービアと、を備え、
前記ソース金属層は、前記誘電体材料上にあり且つ前記ソース及び1又は複数のショットキービア中にあり、
前記ソース金属層は、前記1又は複数のショットキービアの底部で前記1又は複数のショットキー領域と接触し、前記1又は複数のソースビアの底部で前記ソースオーム接点と接触している、
マルチセルMOSFET素子。 - 1又は複数の前記n型ショットキー領域は、前記n型ドリフト層とはドーパント濃度が異なる、
請求項1に記載のマルチセルMOSFET素子。 - 前記n型JFET領域は、前記n型ドリフト層とはドーパント濃度が異なる、
請求項1に記載のマルチセルMOSFET素子。 - 前記ショットキー領域は、隣接するMOSFETセルのp型本体接触領域間にy方向に延在する単一の連続した細長い領域を備える、
請求項1に記載のマルチセルMOSFET素子。 - 前記第一及び第二p型本体接触領域は、y方向に延在する細長い領域である、
請求項4に記載のマルチセルMOSFET素子。 - 前記第一及び第二p型本体接触領域に誘電体材料を更に備える、
請求項1に記載のマルチセルMOSFET素子。 - 前記第一及び第二p型本体接触領域に誘電体材料を更に備える、
請求項1に記載のマルチセルMOSFET素子。 - 前記素子は、前記複数のMOSFETセルの各々に対して1つのn型ショットキー領域を備える、
請求項1に記載のマルチセルMOSFET素子。 - 前記素子は、各MOSFETセルに対して1つ未満のn型ショットキー領域を備える、
請求項1に記載のマルチセルMOSFET素子。 - 前記素子は、偶数個のMOSFETセルと、2つのMOSFETセルごとに1つのn型ショットキー領域を備える、
請求項1に記載のマルチセルMOSFET素子。 - 前記素子は、SiC素子である、
請求項1に記載のマルチセルMOSFET素子。 - p型ウェル領域形成工程と、
n型ソース領域形成工程と、
第一及び第二p型本体接触領域形成工程と、
ゲート酸化層形成工程と、
ゲート層蒸着工程と、
層間絶縁膜素材形成工程と、
ソースオーム接点形成工程と、
ソース金属層蒸着工程と、
金属蒸着形成工程と、を有するマルチセルMOSFET素子を製造する方法であって、
前記p型ウェル領域形成工程において、n型ドリフト層に第一及び第二p型ウェル領域を形成し、前記n型ドリフト層は、n型基板上にあり、
前記第一及び第二p型ウェル領域は、互いに離れるように間隔を置かれ、その間にn型ショットキー領域を形成し、
第一及び第二ウェル領域の隣接し且つ前記n型ショットキー領域とは反対側の前記ドリフト層のn型領域は、第一及び第二JFET領域を形成し、
前記n型ソース領域形成工程において、前記第一及び第二p型ウェル領域の各々に第一及び第二n型ソース領域をそれぞれ形成し、
前記n型ソース領域は、前記第一及び第二JFET領域から間隔を置いて配置され、前記n型ソース領域と前記JFET領域との間にp型チャネル領域を残し、
前記第一及び第二p型本体接触領域形成工程において、前記ショットキー領域と前記第一及び第二n型ソース領域に隣接し且つその間に第一及び第二p型本体接触領域をそれぞれ形成し、
前記ゲート酸化層形成工程において、前記第一及び第二JFET領域上に且つチャネル領域に隣接してゲート酸化層を形成し、
前記ゲート層蒸着工程において、前記ゲート酸化層上にゲート層を蒸着し、
前記層間絶縁膜素材形成工程において、前記ゲート層上に層間絶縁膜素材を形成し、
前記ソースオーム接点形成工程において、前記第一及び第二n型ソース領域及び隣接する前記第一及び第二p型本体接触領域上にソースオーム接点を形成し、
前記ソース金属層蒸着工程において、前記ソースオーム接点上に且つ前記n型ショットキー領域上にソース金属層を蒸着し、
前記ソース金属層は、前記n型ショットキー領域とのショットキー接点を形成し、
前記金属蒸着形成工程において、前記ソース金属層上に最終金属を蒸着し、
前記ソース金属層蒸着工程の前に、前記金属蒸着形成工程が行われ、
前記方法は、
前記ソース金属層蒸着工程の前に、
誘電体材料形成工程と、
1又は複数のソースビア形成工程と、
1又は複数のショットキービア形成工程と、を更に有し、
前記誘電体材料形成工程において、前記ソースオーム接点とショットキー領域上に誘電体材料が形成され、
前記1又は複数のソースビア形成工程において、前記ソースオーム接点上に前記誘電体材料を通じて1又は複数のソースビアを形成し、
前記1又は複数のショットキービア形成工程において、前記ショットキー領域上に前記誘電体材料を通じて1又は複数のショットキービアを形成し、
前記ソース金属層蒸着工程は、前記ソース及びショットキービアにソース金属を蒸着するソース金属蒸着工程を有し、
前記ソース金属層は、前記ソース及びショットキービアの底部までそれぞれ延在する、
マルチセルMOSFET素子を製造する方法。
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