JP6814377B2 - ビア対グリッドのパターニングにおけるオーバレイエラーを減少する方法 - Google Patents
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- 238000000059 patterning Methods 0.000 title claims description 13
- 238000000034 method Methods 0.000 claims description 71
- 238000005530 etching Methods 0.000 claims description 69
- 238000003860 storage Methods 0.000 claims description 52
- 239000000463 material Substances 0.000 claims description 46
- 230000008569 process Effects 0.000 claims description 40
- 239000000758 substrate Substances 0.000 claims description 38
- 125000006850 spacer group Chemical group 0.000 claims description 16
- 239000002131 composite material Substances 0.000 claims description 8
- 239000003989 dielectric material Substances 0.000 claims 1
- 239000004065 semiconductor Substances 0.000 description 5
- 230000006872 improvement Effects 0.000 description 2
- 235000012431 wafers Nutrition 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical group O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- 230000002730 additional effect Effects 0.000 description 1
- 238000000231 atomic layer deposition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
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- H01L21/76807—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing by forming openings in dielectrics for dual damascene structures
- H01L21/76811—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing by forming openings in dielectrics for dual damascene structures involving multiple stacked pre-patterned masks
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- H01L21/76807—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing by forming openings in dielectrics for dual damascene structures
- H01L21/76813—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing by forming openings in dielectrics for dual damascene structures involving a partial via etch
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- H01L21/76801—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing
- H01L21/76829—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing characterised by the formation of thin functional dielectric layers, e.g. dielectric etch-stop, barrier, capping or liner layers
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- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
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Description
この出願は、2016年10月20日に出願された「Method of Reducing Overlay Error in Via to Grid Patterning」という名称の米国仮特許出願第62/410,811号の利益を主張し、その全体が参照により本明細書に組み込まれる。
Claims (15)
- 基板のパターニング方法であって、前記方法は、
第1の記憶層を基板のターゲット層の上に形成するステップと、
第2の記憶層を前記第1の記憶層の上に形成するステップと、
マルチライン層を前記第2の記憶層より上に形成するステップと、
を含み、
前記マルチライン層は、2つ以上の異なる材料の交互のラインのパターンを有する領域を含み、各ラインは、水平方向の厚さおよび垂直方向の高さを有し、前記基板全体に延在し、交互のラインの前記パターンの各ラインは、前記マルチライン層の上面の一部を形成し、前記マルチライン層の底面まで垂直方向に延在し、前記2つ以上の異なる材料の少なくとも2つは、互いに異なるエッチング抵抗率を有することによって、化学的に互いに異なり、
前記方法は、
第1のエッチングマスクを前記マルチライン層の上に形成するステップと、前記第1のエッチングマスクおよび前記マルチライン層の1つまたは複数の材料を第1の複合エッチングマスクとして用いて、前記第1の記憶層をエッチングする第1のエッチングプロセスを実行するステップと、
前記第1のエッチングプロセスを実行するステップの後に、前記マルチライン層から前記2つ以上の異なる材料のうちの少なくとも1つの材料を除去するステップと、
前記マルチライン層をエッチングマスクとして前記第2記憶層をエッチングするするステップと、
前記マルチライン層をエッチングマスクとして前記第2記憶層をエッチングするステップの後に、第2のエッチングマスクを前記マルチライン層の上に形成するステップと、前記第2のエッチングマスクおよび前記マルチライン層の1つまたは複数の材料を第2の複合エッチングマスクとして用いて、前記第1の記憶層をエッチングする第2のエッチングプロセスを実行するステップと、
を含む方法。 - 前記第1のエッチングプロセスを実行するステップの後に、前記第1のエッチングマスクを除去し、前記第2のエッチングプロセスを実行するステップの後に、前記第2のエッチングマスクおよび前記マルチライン層を除去するステップと、
前記第1の記憶層によって定義される第1の記憶層パターンを前記ターゲット層に転写するステップと、
前記第2の記憶層によって定義される第2の記憶層パターンを前記ターゲット層に転写するステップと、
をさらに含む、
請求項1に記載の方法。 - 前記ターゲット層は、誘電材料を備え、
前記第1の記憶層パターンは、ビアを定義し、
前記第2の記憶層パターンは、トレンチを定義する、
請求項2に記載の方法。 - 前記マルチライン層は、マンドレルと、前記マンドレルの側壁の上に形成される側壁スペーサと、を備え、前記側壁スペーサは、マンドレル側およびスペーサ側を有し、前記マンドレル側は、それぞれのマンドレルに接触し、前記側壁スペーサは、隣接する側壁スペーサのスペーサ側の間に開空間を定義する、
請求項2に記載の方法。 - 2つ以上の異なる材料の交互のラインの前記パターンは、A−B−C−B−A−B−C−Bの反復するシーケンスを含み、材料Aおよび材料Bは、互いに異なるエッチング抵抗率を有する、
請求項2に記載の方法。 - 前記基板は、前記第2の記憶層と前記マルチライン層との間の中間層をさらに備える、
請求項4に記載の方法。 - 前記マンドレルは、上のマンドレル層および下のマンドレル層を有する2つの材料の複合物として形成される、
請求項6に記載の方法。 - 前記中間層および前記上のマンドレル層は、同一材料から構成され、前記上のマンドレル層の垂直方向の厚さは、前記中間層の垂直方向の厚さより大きい、
請求項7に記載の方法。 - 前記第1のエッチングマスクを形成するステップの前に、プラグを前記マルチライン層内の開空間内の所定の位置に形成するステップをさらに含む、
請求項4に記載の方法。 - 前記第1のエッチングプロセスを実行するステップの後かつ前記第2のエッチングマスクを形成するステップの前に、プラグを前記マルチライン層内の開空間内の覆われていない位置に形成するステップをさらに含む、
請求項9に記載の方法。 - 前記第2のエッチングマスクを形成するステップの前に、前記第1のエッチングマスクを前記基板から除去する、
請求項2に記載の方法。 - 前記第1のエッチングプロセスを実行するステップは、前記マルチライン層の前記2つ以上の異なる材料の少なくとも1つの覆われていない部分を選択的に除去するステップを含む、
請求項1に記載の方法。 - 前記2つ以上の異なる材料は、3つ以上の異なる材料を含み、前記2つ以上の異なる材料の少なくとも1つを選択的に除去するステップは、前記3つ以上の異なる材料の2つを選択的に除去するステップを含み、その結果、前記ターゲット層の対応する部分は、覆われていない、
請求項12に記載の方法。 - 前記第2のエッチングプロセスを実行するステップは、前記マルチライン層の前記2つ以上の異なる材料の少なくとも1つの覆われていない部分を選択的に除去するステップを含む、
請求項1に記載の方法。 - 前記第1のエッチングマスクを形成するステップの前に、前記マルチライン層をエッチングマスクとして前記第2の記憶層をエッチングするするステップをさらに含む、
請求項1に記載の方法。
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US201662410811P | 2016-10-20 | 2016-10-20 | |
US62/410,811 | 2016-10-20 | ||
PCT/US2017/057366 WO2018075755A1 (en) | 2016-10-20 | 2017-10-19 | Method of reducing overlay error in via to grid patterning |
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JP6814377B2 true JP6814377B2 (ja) | 2021-01-20 |
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US10366890B2 (en) * | 2016-05-23 | 2019-07-30 | Tokyo Electron Limited | Method for patterning a substrate using a layer with multiple materials |
US10026645B2 (en) * | 2016-08-31 | 2018-07-17 | Globalfoundries Inc. | Multiple patterning process for forming pillar mask elements |
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CN109844905A (zh) | 2019-06-04 |
KR102303129B1 (ko) | 2021-09-15 |
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