JP2020043264A - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP2020043264A JP2020043264A JP2018170740A JP2018170740A JP2020043264A JP 2020043264 A JP2020043264 A JP 2020043264A JP 2018170740 A JP2018170740 A JP 2018170740A JP 2018170740 A JP2018170740 A JP 2018170740A JP 2020043264 A JP2020043264 A JP 2020043264A
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 165
- 230000015556 catabolic process Effects 0.000 claims description 22
- 239000012535 impurity Substances 0.000 claims description 20
- 238000009413 insulation Methods 0.000 abstract 5
- 239000010410 layer Substances 0.000 description 20
- 238000000034 method Methods 0.000 description 17
- 238000004519 manufacturing process Methods 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 8
- 239000011229 interlayer Substances 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 229910052814 silicon oxide Inorganic materials 0.000 description 6
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 5
- 229920005591 polysilicon Polymers 0.000 description 5
- 239000000758 substrate Substances 0.000 description 4
- 229910052581 Si3N4 Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001020 plasma etching Methods 0.000 description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 3
- 238000000151 deposition Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910021332 silicide Inorganic materials 0.000 description 1
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
以下、第1の実施形態について説明する。
図1は、本実施形態に係る半導体装置を示す断面図である。
図2は、横軸にゲート電圧をとり、縦軸にドレイン電流をとって、トランジスタのタイプを示すグラフ図である。
図3(a)及び(b)は、本実施形態に係る半導体装置を示す回路図である。
図4〜図16は、本実施形態に係る半導体装置の製造方法を示す断面図である。
図4に示すように、例えばシリコンの単結晶からなる半導体基板10に、低耐圧トランジスタ領域RLと高耐圧トランジスタ領域RHを設定する。そして、半導体基板10の上層部分において、低耐圧トランジスタ領域RLに低電圧用pウェル11を形成すると共に、高耐圧トランジスタ領域RHに高電圧用pウェル12を形成する。
次に、図7に示すように、低耐圧トランジスタ領域RLが開口したレジストマスク82を形成する。次に、レジストマスク82をマスクとしてRIE(Reactive Ion Etching:反応性イオンエッチング)等のエッチング処理を施すことにより、低耐圧トランジスタ領域RLからゲート絶縁膜36を除去する。
次に、図11に示すように、低耐圧トランジスタ領域RLの一部、及び、高耐圧トランジスタ領域RHの一部を覆うように、レジストマスク83を形成する。次に、レジストマスク83をマスクとしてRIE等のエッチング処理を施す。これにより、ポリシリコン膜70がパターニングされて、低耐圧トランジスタ領域RLにゲート電極32が形成されると共に、高耐圧トランジスタ領域RHにゲート電極37が形成される。次に、レジストマスク83を除去する。
次に、図15に示すように、絶縁膜71をエッチバックする。これにより、ゲート電極32の側面上、及び、ゲート電極37の側面上に絶縁膜71が残留し、側壁33及び38が形成される。
図1に示すように、例えば、ソース領域15にソース電位Vsとして0Vを印加し、ドレイン領域20にドレイン電位Vdとして5Vを印加し、ゲート電極32及び37にオフ電位Voffとして0Vを印加する。これにより、トランジスタ41が非導通状態となる。なお、トランジスタ42は導通状態である。
図17は、本比較例に係る半導体装置を示す断面図である。
図17に示すように、本比較例に係る半導体装置101においては、レベルシフト回路をトランジスタ41のみによって構成している。この場合は、ゲート絶縁膜31が薄いため、ゲート−ドレイン間で必要な耐圧を確保しにくくなる。
図18は、本比較例に係る半導体装置を示す断面図である。
図18に示すように、本比較例に係る半導体装置102においては、レベルシフト回路をトランジスタ42のみによって構成している。この場合は、ゲート絶縁膜36が厚いため、ゲート−ドレイン間の耐圧は確保できるものの、オン電流の電流密度が小さくなる。従って、所定のオン電流を確保するためには、ゲート幅を広くする必要がある。一例では、半導体装置102においては、第1の実施形態に係る半導体装置1(図1参照)と比較して、約4倍のゲート幅が必要となる。
次に、第2の実施形態について説明する。
図19は、本実施形態に係る半導体装置を示す断面図である。
半導体装置2においても、チャネル領域26とゲート電極32との間に薄いゲート絶縁膜31が設けられているため、オン電流の電流密度を高くすることができる。また、コンタクト57とゲート電極32との間の距離D1は、コンタクト59とゲート電極32との間の距離D2よりも短いため、トランジスタ41を非導通状態としたときに、チャネル領域26の電位は、ドレイン電位Vdよりもソース電位Vsに近くなる。これにより、ゲート電位Vgをソース電位Vsと同じオフ電位Voffとしたときに、ゲート絶縁膜31に高い電圧が印加されることを回避できる。この結果、半導体装置2は耐圧が高い。このように、本実施形態によっても、所定の耐圧とオン電流を確保しつつ、ゲート幅を短縮することができる。本実施形態における上記以外の構成、動作及び効果は、第1の実施形態と同様である。
10:半導体基板
11:低電圧用pウェル
12:高電圧用pウェル
13:p形半導体領域
15:ソース領域
16、17:LDD領域
18:n形半導体領域
20:ドレイン領域
21、22:LDD領域
23、24:n形半導体領域
26、27:チャネル領域
31:ゲート絶縁膜
32:ゲート電極
33:側壁
35:段差
36:ゲート絶縁膜
37:ゲート電極
38:側壁
41、42:トランジスタ
51:半導体領域
52:絶縁膜
53:n形半導体領域
55:ストッパ膜
56:層間絶縁膜
57、58、59:コンタクト
70:ポリシリコン膜
71:絶縁膜
81、82、83、84、85:レジストマスク
101、102:半導体装置
D1、D2:距離
RH:高耐圧トランジスタ領域
RL:低耐圧トランジスタ領域
Claims (12)
- 第1導電形の第1半導体領域と、
前記第1半導体領域に接し、相互に離隔した第2導電形の第2半導体領域及び第3半導体領域と、
前記第1半導体領域に接し、前記第2半導体領域と前記第3半導体領域の間に配置され、前記第2半導体領域及び前記第3半導体領域から離隔した前記第2導電形の第4半導体領域と、
前記第1半導体領域における前記第2半導体領域と前記第4半導体領域との間の第1部分に接した第1絶縁膜と、
前記第1半導体領域における前記第3半導体領域と前記第4半導体領域との間の第2部分に接し、前記第1絶縁膜よりも厚い第2絶縁膜と、
前記第1絶縁膜に接した第1電極と、
前記第2絶縁膜に接した第2電極と、
を備えた半導体装置。 - 前記第1部分、前記第2半導体領域、前記第4半導体領域、前記第1絶縁膜及び前記第1電極により、第1トランジスタが形成され、
前記第2部分、前記第3半導体領域、前記第4半導体領域、前記第2絶縁膜及び前記第2電極により、第2トランジスタが形成される請求項1記載の半導体装置。 - 前記第1トランジスタはE型であり、前記第2トランジスタはI型又はD型である請求項2記載の半導体装置。
- 前記第2トランジスタのゲート−ドレイン耐圧は、前記第1トランジスタのゲート−ドレイン耐圧よりも高い請求項2または3に記載の半導体装置。
- 前記第2電極は前記第1電極に接続された請求項1〜4のいずれか1つに記載の半導体装置。
- 前記第1絶縁膜は前記第2絶縁膜に接している請求項1〜5のいずれか1つに記載の半導体装置。
- 前記第1電極は、前記第1絶縁膜における前記第2絶縁膜側の端縁から離隔しており、
前記第2電極は、前記第2絶縁膜における前記第1絶縁膜側の端縁から離隔している請求項1〜6のいずれか1つに記載の半導体装置。 - 第1導電形の第1半導体領域と、
前記第1半導体領域に接し、相互に離隔した第2導電形の第2半導体領域及び第3半導体領域と、
前記第1半導体領域における前記第2半導体領域と前記第3半導体領域との間の部分に接した第1絶縁膜と、
前記第1絶縁膜に接した電極と、
前記第3半導体領域に接し、前記第1絶縁膜よりも厚い第2絶縁膜と、
前記電極及び前記第2絶縁膜を覆う第3絶縁膜と、
を備えた半導体装置。 - 前記第3半導体領域は、
前記第2半導体領域に対向した第1部分と、
前記第1部分に接し、不純物濃度が前記第1部分の不純物濃度よりも高い第2部分と、
前記第2部分に接し、不純物濃度が前記第2部分の不純物濃度よりも低い第3部分と、
前記第3部分に接し、不純物濃度が前記第3部分の不純物濃度よりも高い第4部分と、
を有し、
前記第1部分、前記第2部分、前記第3部分及び前記第4部分は、この順に配列されており、
前記第2絶縁膜は前記第3部分に接した請求項8記載の半導体装置。 - 前記第3絶縁膜内に設けられ、前記第2半導体領域に接続された第1コンタクトと、
前記第3絶縁膜内に設けられ、前記第3半導体領域に接続された第2コンタクトと、
をさらに備え、
前記第1コンタクトと前記電極との距離は、前記第2コンタクトと前記電極との間の距離よりも短い請求項8または9に記載の半導体装置。 - 前記第2絶縁膜と前記第3絶縁膜との間に配置され、組成が前記第2絶縁膜の組成及び前記第3絶縁膜の組成とは異なる第4絶縁膜をさらに備えた請求項8〜10のいずれか1つに記載の半導体装置。
- 前記第1絶縁膜の厚さは2.5nm以下である請求項1〜11のいずれか1つに記載の半導体装置。
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