JP6317076B2 - 量子井戸閉じ込めのための歪み層を有するデバイスおよびその製造方法 - Google Patents
量子井戸閉じ込めのための歪み層を有するデバイスおよびその製造方法 Download PDFInfo
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- 238000000034 method Methods 0.000 title description 17
- 238000004519 manufacturing process Methods 0.000 title description 7
- 230000004888 barrier function Effects 0.000 claims description 113
- 239000000758 substrate Substances 0.000 claims description 51
- 239000000203 mixture Substances 0.000 claims description 44
- 239000004065 semiconductor Substances 0.000 claims description 21
- 230000000694 effects Effects 0.000 claims description 16
- 229910000577 Silicon-germanium Inorganic materials 0.000 claims description 3
- 229910005898 GeSn Inorganic materials 0.000 description 14
- 239000002019 doping agent Substances 0.000 description 14
- 229910052732 germanium Inorganic materials 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 230000007547 defect Effects 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000011065 in-situ storage Methods 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 3
- 238000002513 implantation Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- LEVVHYCKPQWKOP-UHFFFAOYSA-N [Si].[Ge] Chemical compound [Si].[Ge] LEVVHYCKPQWKOP-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
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- H01L29/1054—Channel region of field-effect devices of field-effect transistors with insulated gate, e.g. characterised by the length, the width, the geometric contour or the doping structure with a variation of the composition, e.g. channel with strained layer for increasing the mobility
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
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- H01L29/76—Unipolar devices, e.g. field effect transistors
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/778—Field effect transistors with two-dimensional charge carrier gas channel, e.g. HEMT ; with two-dimensional charge-carrier layer formed at a heterojunction interface
- H01L29/7781—Field effect transistors with two-dimensional charge carrier gas channel, e.g. HEMT ; with two-dimensional charge-carrier layer formed at a heterojunction interface with inverted single heterostructure, i.e. with active layer formed on top of wide bandgap layer, e.g. IHEMT
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Description
半導体基板と、
Geを含む歪緩和バッファ(SRB)層と、
SiGeを含む歪量子バリア層(SQB)層と、
Geを含むチャネル層とを備え、
歪量子バリア層は、歪緩和バッファ層とチャネル層との間に配置され、これら両方と物理的に接触し、
歪緩和バッファ層(SRB)、歪量子バリア層およびチャネル層の組成は、歪量子バリア層とチャネル層との間に、少なくとも約0.4%の格子定数不整合度が存在するように選択されたn型FETトランジスタについて説明している。
(a)パターニングされた半導体基板を準備する工程であって、当該半導体基板は、底部で半導体基板を露出させる凹部を有し、かつ、絶縁対材料を含む側壁を有するようにした工程、続いて、
(b)Geを含む歪緩和バッファSRB層をエピタキシャル成長によって凹部内に形成する工程、続いて、
(c)歪緩和バッファ層の上位にあって歪緩和バッファ層に接し、かつSiGeを含む歪量子バリアSQB層をエピタキシャル成長によって形成する工程と、続いて、
(d)歪量子バリア層の上位にあって歪量子バリア層に接し、かつGeを含むチャネル層をエピタキシャル成長によって形成する工程とを含み、
(e)歪緩和バッファ層、歪量子バリア層およびチャネル層の組成は、歪量子バリア層とチャネル層との間に、少なくとも約0.4%の格子定数不整合度が存在するように選択されるようにした、n型FETトランジスタを製造する方法について説明している。
Claims (15)
- 半導体基板(1)と、
半導体基板(1)の上に形成され、Geを含む歪緩和バッファ層(2)と、
歪緩和バッファ層(2)の上に形成されたチャネル層(5)と、
SiGeを含む歪量子バリア層(4)とを備え、
歪量子バリア層(4)は、歪緩和バッファ層(2)とチャネル層(5)との間に配置され、これら両方と物理的に接触し、
歪緩和バッファ層(2)、歪量子バリア層(4)およびチャネル層(5)の組成は、歪緩和バッファ層(2)に対するチャネル層(5)のバンドオフセットと歪量子バリア層(4)のバンドオフセットが反対の符号を有するように選択され、これにより、n型FinFETデバイスについては伝導帯バンド構造において、p型FinFETデバイスについては価電子帯バンド構造において、それぞれ量子井戸効果が作り出され、チャネル内でのキャリア閉じ込めが向上するようにした、FinFETデバイス。 - チャネル層(5)は、Geを含む、請求項1に記載のFinFETデバイス。
- n型FinFETであって、
歪緩和バッファ層(2)、歪量子バリア層(4)およびチャネル層(5)の組成は、歪量子バリア層(4)とチャネル層(5)との間に、少なくとも0.4%の格子定数不整合度が存在するように選択された、請求項2に記載のFinFETデバイス。 - p型FETであって、
歪緩和バッファ層(2)、歪量子バリア層(4)およびチャネル層(5)の組成は、歪量子バリア層(4)が歪緩和バッファ層(2)よりも少量のGeを含むように選択された、請求項2に記載のFinFETデバイス。 - 歪緩和バッファ層(2)および/またはチャネル層(5)は、さらにSiを含む、請求項1〜4のいずれか1項に記載のFinFETデバイス。
- 歪緩和バッファ層(2)および/またはチャネル層(5)は、さらにSnを含む、請求項1〜5のいずれか1項に記載のFinFETデバイス。
- n型FETであって、
チャネル層(5)は、Siからなる、請求項1に記載のFinFETデバイス。 - 歪緩和バッファ層(2)、歪量子バリア層(4)およびチャネル層(5)の組成は、歪量子バリア層(4)が歪緩和バッファ層(2)よりも多量のGeを含むように選択された、請求項7に記載のFinFETデバイス。
- 歪量子バリア層(4)は、3nmから30nmの厚さを有する、請求項1〜8のいずれか1項に記載のFinFETデバイス。
- 半導体基板(1)と、
半導体基板(1)の上に形成され、Geを含む歪緩和バッファ層(2)と、
歪緩和バッファ層(2)の上に形成され、Geを含むチャネル層(5)と、
SiGeを含む歪量子バリア層(4)とを備え、
歪量子バリア層(4)は、歪緩和バッファ層(2)とチャネル層(5)との間に配置され、これら両方と物理的に接触し、
歪緩和バッファ層(2)、歪量子バリア層(4)およびチャネル層(5)の組成は、歪緩和バッファ層(2)に対するチャネル層(5)のバンドオフセットと歪量子バリア層(4)のバンドオフセットが反対の符号を有するように選択され、これにより、n型FETデバイスについては伝導帯バンド構造において、p型FETデバイスについては価電子帯バンド構造において、それぞれ量子井戸効果が作り出され、チャネル内でのキャリア閉じ込めが向上するようにした、プレーナ型FETデバイス。 - n型FETであって、
歪緩和バッファ層(2)、歪量子バリア層(4)およびチャネル層(5)の組成は、歪量子バリア層(4)とチャネル層(5)との間に、少なくとも0.4%の格子定数不整合度が存在するように選択された、請求項10に記載のプレーナ型FETデバイス。 - 歪緩和バッファ層(2)および/またはチャネル層(5)は、さらにSiを含む、請求項10または11に記載のプレーナ型FETデバイス。
- 歪緩和バッファ層(2)および/またはチャネル層(5)は、さらにSnを含む、請求項10または11に記載のプレーナ型FETデバイス。
- p型FETであって、
歪緩和バッファ層(2)、歪量子バリア層(4)およびチャネル層(5)の組成は、歪量子バリア層(4)が歪緩和バッファ層(2)よりも少量のGeを含むように選択された、請求項10に記載のプレーナ型FETデバイス。 - 歪量子バリア層(4)は、3nmから30nmの厚さを有する、請求項10〜14のいずれか1項に記載のプレーナ型FETデバイス。
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2013
- 2013-05-31 EP EP13170002.3A patent/EP2701198A3/en not_active Withdrawn
- 2013-06-07 JP JP2013121060A patent/JP6317076B2/ja active Active
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EP2701198A3 (en) | 2017-06-28 |
EP2701198A2 (en) | 2014-02-26 |
US9006705B2 (en) | 2015-04-14 |
JP2014045170A (ja) | 2014-03-13 |
US20140054547A1 (en) | 2014-02-27 |
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