JP2005150731A - Cmosウェル構造およびその形成方法 - Google Patents
Cmosウェル構造およびその形成方法 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 99
- 239000000758 substrate Substances 0.000 claims abstract description 53
- 125000006850 spacer group Chemical group 0.000 claims abstract description 21
- 238000002955 isolation Methods 0.000 claims abstract description 11
- 238000002513 implantation Methods 0.000 claims description 14
- 238000005229 chemical vapour deposition Methods 0.000 claims description 12
- 239000002019 doping agent Substances 0.000 claims description 7
- 238000005530 etching Methods 0.000 claims description 7
- 150000004767 nitrides Chemical class 0.000 claims description 6
- 239000007943 implant Substances 0.000 claims description 5
- 230000003647 oxidation Effects 0.000 claims description 5
- 238000007254 oxidation reaction Methods 0.000 claims description 5
- 238000000407 epitaxy Methods 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 12
- 208000012868 Overgrowth Diseases 0.000 description 9
- 238000007517 polishing process Methods 0.000 description 8
- 239000004020 conductor Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 235000012239 silicon dioxide Nutrition 0.000 description 6
- 239000000377 silicon dioxide Substances 0.000 description 6
- 239000004065 semiconductor Substances 0.000 description 5
- 229910052581 Si3N4 Inorganic materials 0.000 description 4
- 238000005468 ion implantation Methods 0.000 description 4
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000001039 wet etching Methods 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 238000012864 cross contamination Methods 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000004969 ion scattering spectroscopy Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000059 patterning Methods 0.000 description 2
- 238000001020 plasma etching Methods 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 229920005591 polysilicon Polymers 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
【解決手段】CMOSウェル構造を形成する方法は、複数の第1の導電型ウェルを基板の上に形成することを含み、その複数の第1の導電型ウェルの各々は第1のマスクのそれぞれの開口に形成される。第1の導電型ウェルの各々の上にキャップが形成され、第1のマスクが除去される。側壁スペーサが第1の導電型ウェルの各々の側壁に形成される。複数の第2の導電型ウェルが形成され、その複数の第2の導電型ウェルの各々はそれぞれの第1の導電型ウェルの間に形成される。複数の浅いトレンチ分離が第1の導電型ウェルと第2の導電型ウェルの間に形成される。複数の第1の導電型ウェルは第1の選択エピタキシャル成長プロセスで形成され、複数の第2の導電型ウェルは第2の選択エピタキシャル成長プロセスで形成される。
【選択図】図11
Description
12 nウェル・マスクの開口
16 nウェル領域(n型エピタキシャル成長)
15 p型基板
20 深さdを有する開口
21、31 キャップ
26 n+注入領域
28、50 スペーサ
30 pウェル領域(p型エピタキシャル成長)
32 浅いトレンチ分離
34 nウェル・デバイス領域
36 pウェル・デバイス領域
40 pMOSデバイス
42 nMOSデバイス
44 ゲート誘電体
46 ゲート導体
48 ハード・マスク
b エッチ・バック深さ
d エッチング深さ
f、h 過成長
Claims (34)
- CMOSウェル構造を形成する方法であって、
複数の開口を有する第1のマスクを、基板上に形成するステップと、
複数の第1の導電型ウェルを前記基板の上に形成するステップであって、前記複数の第1の導電型ウェルの各々が前記第1のマスクのそれぞれの開口に形成されるステップと、
前記第1の導電型ウェルの各々の上にキャップを形成するステップと、
前記第1のマスクを除去するステップと、
側壁スペーサを前記第1の導電型ウェルの各々の側壁に形成するステップと、
複数の第2の導電型ウェルを形成するステップであって、前記複数の第2の導電型ウェルの各々がそれぞれの第1の導電型ウェルの間に形成されるステップとを備える方法。 - さらに、
複数の浅いトレンチ分離を前記第1の導電型ウェルと前記第2の導電型ウェルの間に形成するステップと、
少なくとも1つの第2の導電型MOSデバイスを、前記複数の第1の導電型ウェルの各々の内部に形成するステップと、
少なくとも1つの第1の導電型MOSデバイスを、前記複数の第2の導電型ウェルの各々の内部に形成するステップとを備える、請求項1に記載の方法。 - 前記複数の第1の導電型ウェルが第1の選択エピタキシャル成長プロセスで形成され、前記複数の第2の導電型ウェルが第2の選択エピタキシャル成長プロセスで形成される、請求項1に記載の方法。
- 前記第1のマスクが、低温化学気相成長窒化物である、請求項1に記載の方法。
- 前記第1のマスクの厚さが、50nmから500nmの範囲にある、請求項1に記載の方法。
- 複数の第1の導電型ウェルを形成する前記ステップが、第1の導電型ドーパントが同時にドープされる第1のエピタキシャル層を形成するステップを備える、請求項3に記載の方法。
- 前記第1の導電型ドーパントのドーピング濃度が、1×1017/cm3から1×1020/cm3の範囲にある、請求項6に記載の方法。
- さらに、
エピタキシのファセット化を避けるために、前記第1のエピタキシャル層を前記第1のマスクの厚さよりも厚く形成するステップと、
前記第1のエピタキシャル層を前記第1のマスクの厚さよりも薄くなるようにエッチ・バックするステップとを備える、請求項6に記載の方法。 - 複数の第2の導電型ウェルを形成する前記ステップが、第2の導電型ドーパントが同時にドープされる第2のエピタキシャル層を形成するステップを備える、請求項3に記載の方法。
- 前記第2の導電型ドーパントのドーピング濃度が、1×1017/cm3から1×1020/cm3の範囲にある、請求項9に記載の方法。
- さらに、
角のファセット化を避けるために、前記第2のエピタキシャル層を前記第1の導電型ウェルの厚さよりも厚く形成するステップと、
前記第2のエピタキシャル層を平坦化するステップとを備える、請求項9に記載の方法。 - キャップを形成する前記ステップが、熱酸化を備える、請求項1に記載の方法。
- 側壁スペーサを形成する前記ステップが、化学気相成長法を備える、請求項1に記載の方法。
- 前記側壁スペーサが、窒化物で作られる、請求項1に記載の方法。
- 前記側壁スペーサの厚さが、5nmから30nmの範囲にある、請求項1に記載の方法。
- 前記第1の導電型がn型であり、前記第2の導電型がp型である、請求項1に記載の方法。
- さらに、
前記基板の上に複数の第1の導電型ウェルを形成する前に、前記第1のマスクの前記複数の開口の間の前記基板を所定の深さまでエッチングするステップを備える、請求項1に記載の方法。 - さらに、
側壁スペーサを形成する前記ステップの前に複数の第1の導電型注入領域を前記基板に形成するステップであって、前記複数の第1の導電型注入領域の各々が前記基板のそれぞれの露出表面に形成されるステップを備える、請求項17に記載の方法。 - 前記複数の第1の導電型ウェルが第1の選択エピタキシャル成長プロセスで形成され、前記複数の第2の導電型ウェルが、前記第1の導電型注入領域の露出表面の上に、第2の選択エピタキシャル成長プロセスで形成される、請求項18に記載の方法。
- 前記所定の深さが、20nmから500nmの範囲にある、請求項17に記載の方法。
- 前記第1の導電型注入領域のドーピング濃度が、1×1019/cm3から1×1021/cm3の範囲にある、請求項18に記載の方法。
- 前記複数の第1の導電型注入領域が、基板中に20nmから600nmの深さで形成される、請求項18に記載の方法。
- 前記複数の第1の導電型ウェルの少なくとも1つが、少なくとも1つの第2の導電型ウェルの境界を成すダミーの第1の導電型ウェルである、請求項19に記載の方法。
- 前記複数の第2の導電型ウェルの少なくとも1つが、少なくとも1つの第1の導電型ウェルの境界を成すダミーの第2の導電型ウェルである、請求項19に記載の方法。
- 前記第1の導電型がn型であり、前記第2の導電型がp型である、請求項19に記載の方法。
- CMOSウェル構造であって、
複数の開口を有する第1のマスクを、基板上に形成するステップと、
複数の第1の導電型ウェルを前記基板の上に形成するステップであって、前記複数の第1の導電型ウェルの各々が前記第1のマスクのそれぞれの開口に形成されるステップと、
前記第1の導電型ウェルの各々の上にキャップを形成するステップと、
前記第1のマスクを除去するステップと、
側壁スペーサを前記第1の導電型ウェルの各々の側壁に形成するステップと、
複数の第2の導電型ウェルを形成するステップであって、前記複数の第2の導電型ウェルの各々がそれぞれの第1の導電型ウェルの間に形成されるステップとを備える方法で形成されるCMOSウェル構造。 - 前記方法が、さらに、
複数の浅いトレンチ分離を前記第1の導電型ウェルと前記第2の導電型ウェルの間に形成するステップと、
少なくとも1つの第2の導電型MOSデバイスを、前記複数の第1の導電型ウェルの各々の内部に形成するステップと、
少なくとも1つの第1の導電型MOSデバイスを、前記複数の第2の導電型ウェルの各々の内部に形成するステップとを備える、請求項26に記載のCMOSウェル構造。 - 前記複数の第1の導電型ウェルが第1の選択エピタキシャル成長プロセスで形成され、前記複数の第2の導電型ウェルが第2の選択エピタキシャル成長プロセスで形成される、請求項26に記載のCMOSウェル構造。
- 前記基板の上に複数の第1の導電型ウェルを形成する前に、前記第1のマスクの前記複数の開口の間の前記基板が所定の深さまでエッチングされる、請求項26に記載のCMOSウェル構造。
- 側壁スペーサを形成する前記ステップの前に、複数の第1の導電型注入領域が前記基板に形成され、前記複数の第1の導電型注入領域の各々が前記基板のそれぞれの露出表面に形成される、請求項29に記載のCMOSウェル構造。
- 前記複数の第1の導電型ウェルが第1の選択エピタキシャル成長プロセスで形成され、前記複数の第2の導電型ウェルが、前記第1の導電型注入領域の露出表面の上に、第2の選択エピタキシャル成長プロセスで形成される、請求項30に記載のCMOSウェル構造。
- 前記第1の導電型がn型であり、前記第2の導電型がp型である、請求項26に記載のCMOSウェル構造。
- CMOSウェル構造を形成する方法であって、
複数の開口を有する第1のマスクを、基板上に形成するステップと、
前記第1のマスクの前記複数の開口の間の基板を所定の深さまでエッチングするステップと、
複数の第1の導電型ウェルを前記基板の上に形成するステップであって、前記複数の第1の導電型ウェルの各々が前記第1のマスクのそれぞれの開口に形成されるステップと、
前記第1の導電型ウェルの各々の上にキャップを形成するステップと、
前記第1のマスクを除去するステップと、
複数の第1の導電型注入領域を前記基板に形成するステップであって、前記複数の第1の導電型注入領域の各々が前記基板のそれぞれの露出表面に形成されるステップと、
側壁スペーサを前記第1の導電型ウェルの各々の側壁に形成するステップと、
複数の第2の導電型ウェルを形成するステップであって、前記複数の第2の導電型ウェルの各々がそれぞれの第1の導電型ウェルの間に形成されるステップとを備える方法。 - 前記複数の第1の導電型ウェルが第1の選択エピタキシャル成長プロセスで形成され、前記複数の第2の導電型ウェルが、前記第1の導電型注入領域の露出表面の上に、第2の選択エピタキシャル成長プロセスで形成される、請求項33に記載の方法。
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US20050106800A1 (en) | 2005-05-19 |
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US7132323B2 (en) | 2006-11-07 |
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