JP6839297B2 - トレンチ分離構造およびその製造方法 - Google Patents
トレンチ分離構造およびその製造方法 Download PDFInfo
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- JP6839297B2 JP6839297B2 JP2019541255A JP2019541255A JP6839297B2 JP 6839297 B2 JP6839297 B2 JP 6839297B2 JP 2019541255 A JP2019541255 A JP 2019541255A JP 2019541255 A JP2019541255 A JP 2019541255A JP 6839297 B2 JP6839297 B2 JP 6839297B2
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- 238000000926 separation method Methods 0.000 title claims description 33
- 238000004519 manufacturing process Methods 0.000 title claims description 23
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 77
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 77
- 238000000034 method Methods 0.000 claims description 43
- -1 nitrogen-containing compound Chemical class 0.000 claims description 38
- 238000005530 etching Methods 0.000 claims description 27
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 22
- 229920005591 polysilicon Polymers 0.000 claims description 22
- 230000003647 oxidation Effects 0.000 claims description 14
- 238000007254 oxidation reaction Methods 0.000 claims description 14
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 13
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 13
- 238000000151 deposition Methods 0.000 claims description 10
- 150000002500 ions Chemical class 0.000 claims description 8
- 230000008021 deposition Effects 0.000 claims description 6
- 238000005498 polishing Methods 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- 238000005229 chemical vapour deposition Methods 0.000 claims description 5
- 238000001312 dry etching Methods 0.000 claims description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 4
- 238000007740 vapor deposition Methods 0.000 claims description 4
- 238000001020 plasma etching Methods 0.000 claims description 3
- 230000007480 spreading Effects 0.000 claims description 3
- 238000003892 spreading Methods 0.000 claims description 3
- 238000000427 thin-film deposition Methods 0.000 claims description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 2
- 230000001590 oxidative effect Effects 0.000 claims 1
- 239000004065 semiconductor Substances 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000010408 film Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000002784 hot electron Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000001459 lithography Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005019 vapor deposition process Methods 0.000 description 1
- 238000001039 wet etching Methods 0.000 description 1
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Description
104 N型リング
106 P型リング
201 第2トレンチ
202 シリコン酸化物
204 側壁酸化物層
206 シリコン酸化物
302 シリコン窒化物層
304 窒素含有化合物の側壁残留物
404 ポリシリコン
Claims (18)
- トレンチ分離構造を製造する方法であって、
ウエハーの表面上に幅広上部および幅狭底部を有する第1トレンチを形成するステップと、
前記第1トレンチ内に蒸着によってシリコン酸化物を充填させるステップと、
前記第1トレンチ内の前記シリコン酸化物の表面の一部をエッチングによって除去するステップと、
前記第1トレンチの前記上部のコーナーに熱酸化によってシリコン酸化物コーナー構造を形成するステップであって、前記シリコン酸化物コーナー構造は、前記第1トレンチ内の前記シリコン酸化物が前記コーナーの下方から徐々に厚くなる構造であるステップと、
前記ウエハーの表面上に窒素含有化合物を蒸着して、前記第1トレンチ内の前記シリコン酸化物の表面および前記シリコン酸化物コーナー構造の表面をカバーするステップと、
前記窒素含有化合物をドライエッチングし、前記第1トレンチ内の前記シリコン酸化物の表面上の前記窒素含有化合物を除去し、前記シリコン酸化物コーナー構造の表面上に前記トレンチに広がる窒素含有化合物の側壁残留物を形成するステップと、
マスクとして前記窒素含有化合物の側壁残留物を使用して前記シリコン酸化物および前記ウエハーを下方に継続的にエッチングして、第2トレンチを形成するステップと、
前記第2トレンチの側壁および底部の上にシリコン酸化物層を形成するステップと、
前記第1トレンチおよび前記第2トレンチの中にポリシリコンを蒸着するステップと、
前記窒素含有化合物の側壁残留物を除去するステップと、
前記第1トレンチ内にシリコン酸化物を形成して前記ポリシリコンをカバーするステップと、
を含む方法。 - 前記第1トレンチは深さ1〜2μmであり、前記第2トレンチは深さ10μm以上である、請求項1に記載の方法。
- 前記第2トレンチの側壁および底部の上にシリコン酸化物層を形成するステップは、熱酸化プロセスで行われ、形成されたシリコン酸化物層は、少なくとも1000オングストロームの厚さである、請求項1に記載の方法。
- 前記第2トレンチの側壁および底部の上にシリコン酸化物層を形成するステップの後で、前記第1トレンチおよび前記第2トレンチの中にポリシリコンを蒸着するステップより前に、本方法は、N型イオンとP型イオンをそれぞれ前記第2トレンチの中に埋め込んで、N型リングおよびP型リングを前記第2トレンチの底部の周りに形成するステップをさらに含む、請求項1に記載の方法。
- 前記窒素含有化合物の側壁残留物を除去するステップより前に、本方法は、前記窒素含有化合物の側壁残留物の下の位置にポリシリコンをエッチングするステップをさらに含む、請求項1に記載の方法。
- 前記第1トレンチ内に蒸着によってシリコン酸化物を充填させるステップより前に、本方法は、前記第1トレンチの側壁を酸化させるステップをさらに含む、請求項1に記載の方法。
- 前記ウエハーの表面上に幅広上部および幅狭底部を有する第1トレンチを形成するステップより前に、本方法は、ウエハーの表面上にシリコン窒化層を形成するステップを含み、前記ウエハーの表面上の幅広上部および幅狭底部を有する第1トレンチを形成するステップは、前記シリコン窒化層を貫通してエッチングして第1トレンチを形成する、請求項1に記載の方法。
- 前記第1トレンチの上部コーナーに熱酸化によってシリコン酸化物コーナー構造を形成するステップにおいて、酸化温度は800℃〜950℃である、請求項1に記載の方法。
- 基板上にエピタキシャルプロセスによってエピタキシャル層をエピタキシャル成長させるステップをさらに含み、前記エピタキシャル層は、前記基板よりも高いドーピング濃度を有し、前記ウエハーの表面上に第1トレンチを形成するステップは、前記エピタキシャル層内に前記第1トレンチを形成する、請求項1に記載の方法。
- 前記第1トレンチ内に蒸着によって前記シリコン酸化物を充填させるステップにおいて、前記シリコン酸化物の蒸着は、高密度プラズマ化学気相蒸着プロセスを使用して行われる、請求項1に記載の方法。
- 前記第1トレンチ内に蒸着によって前記シリコン酸化物を充填させるステップの後で、前記第1トレンチ内の前記シリコン酸化物の表面の一部をエッチングによって除去するステップより前に、本方法は、化学機械研磨によって前記第1トレンチの外側に露出したシリコン酸化物層を除去するステップをさらに含む、請求項1に記載の方法。
- 前記第1トレンチ内に蒸着によって前記シリコン酸化物を充填させるステップの後で、前記第1トレンチ内の前記シリコン酸化物の表面の一部をエッチングによって除去するステップより前に、本方法は、シリコン酸化物層を研磨して、シリコン窒化層を出すステップをさらに含む、請求項7に記載の方法。
- 前記窒素含有化合物の側壁残留物を除去するステップは、エッチング液として濃リン酸を使用して行われる、請求項1に記載の方法。
- 前記第1トレンチ内にシリコン酸化物を形成して前記ポリシリコンをカバーするステップにおいて、前記シリコン酸化物の蒸着は、高密度プラズマ化学気相蒸着プロセスを使用して行われる、請求項1に記載の方法。
- 前記第1トレンチ内にシリコン酸化物を形成して前記ポリシリコンをカバーするステップの後に、本方法は、化学機械研磨によって前記第1トレンチの外側に露出した前記シリコン酸化物を平坦化するステップをさらに含む、請求項1に記載の方法。
- 前記ウエハーの表面上に幅広上部と幅狭底部とを有する第1トレンチを形成するステップは、エッチング液としてCHCI3および/またはCH2CI2を使用してエッチングを行う、請求項1に記載の方法。
- 前記第1トレンチ内のシリコン酸化物の表面の一部をエッチングによって除去するステップは、ドライエッチングである、請求項1に記載の方法。
- 前記第1トレンチ内のシリコン酸化物の表面の一部をエッチングによって除去するステップは、高濃度プラズマエッチングプロセスを使用して行われる、請求項1に記載の方法。
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