JP7227117B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP7227117B2 JP7227117B2 JP2019203060A JP2019203060A JP7227117B2 JP 7227117 B2 JP7227117 B2 JP 7227117B2 JP 2019203060 A JP2019203060 A JP 2019203060A JP 2019203060 A JP2019203060 A JP 2019203060A JP 7227117 B2 JP7227117 B2 JP 7227117B2
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- 239000004065 semiconductor Substances 0.000 title claims description 177
- 238000002955 isolation Methods 0.000 claims description 42
- 239000000758 substrate Substances 0.000 claims description 19
- 238000005192 partition Methods 0.000 claims description 9
- 239000011159 matrix material Substances 0.000 claims description 3
- 238000012986 modification Methods 0.000 description 42
- 230000004048 modification Effects 0.000 description 42
- 239000010410 layer Substances 0.000 description 35
- 230000000694 effects Effects 0.000 description 14
- 230000003071 parasitic effect Effects 0.000 description 10
- 239000012535 impurity Substances 0.000 description 5
- 239000011229 interlayer Substances 0.000 description 4
- 230000001172 regenerating effect Effects 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 229910052814 silicon oxide Inorganic materials 0.000 description 3
- 239000000470 constituent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 230000002265 prevention Effects 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
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
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- H01L29/7833—Field effect transistors with field effect produced by an insulated gate with lightly doped drain or source extension, e.g. LDD MOSFET's; DDD MOSFET's
- H01L29/7835—Field effect transistors with field effect produced by an insulated gate with lightly doped drain or source extension, e.g. LDD MOSFET's; DDD MOSFET's with asymmetrical source and drain regions, e.g. lateral high-voltage MISFETs with drain offset region, extended drain MISFETs
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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平面図である。
図2は、本実施形態に係る半導体装置を示す断面図である。
なお、各図は模式的なものであり、構成要素は適宜簡略化若しくは省略、又は誇張されている。また、図間において、構成要素の数及び寸法比は必ずしも一致しない。後述する他の図においても同様である。
図1及び図2に示すように、本実施形態に係る半導体装置1においては、半導体基板10が設けられている。半導体基板10は例えば単結晶のシリコンからなり、その導電形は例えばp形である。半導体基板10上には、半導体層11が設けられている。半導体層11は例えば、エピタキシャル成長した単結晶のシリコンからなり、その導電形はp形である。
本実施形態においては、第1領域R1の構成と第2領域R2の構成は実質的に同じである。第1領域R1及び第2領域R2においては、それぞれ、p形領域31が設けられている。p形領域31は半導体層11の一部であり、ディープn形領域15及びガードリング領域19に接している。
図3は、本実施形態に係る半導体装置1の動作を示す図である。
デバイス領域RD1は電流制御回路を構成し、小電流素子52は小電流回路を構成する。小電流回路は、例えば信号処理回路であり、例えばアナログ回路である。このため、小電流素子52のn形ウェル26に流れる電流は、LDMOS51のp形領域31に流れる電流よりも小さい。
本実施形態によれば、デバイス部分21に分離領域22を設けてディープn形領域15に接続している。このため、LDMOS51のドレイン領域35に負回生電流が流入し、寄生ダイオード101及び寄生npnトランジスタ102が導通しても、ディープn形領域15及びガードリング領域19の電位の変動を抑制し、寄生npnトランジスタ103の導通を抑制する。これにより、小電流素子52の動作への影響を抑制できる。すなわち、LDMOS51が小電流素子52に干渉することを抑制できる。この結果、デバイス領域RD1とデバイス領域RD2との距離を短縮し、半導体装置1の小型化を図ることができる。
次に、第1の実施形態の第1の変形例について説明する。
図4は、本変形例に係る半導体装置を示す平面図である。
次に、第1の実施形態の第2の変形例について説明する。
図5は、本変形例に係る半導体装置を示す平面図である。
次に、第1の実施形態の第3の変形例について説明する。
図6は、本変形例に係る半導体装置を示す平面図である。
次に、第1の実施形態の第4の変形例について説明する。
図7は、本変形例に係る半導体装置を示す平面図である。
次に、第1の実施形態の第5の変形例について説明する。
図8は、本変形例に係る半導体装置を示す平面図である。
次に、第1の実施形態の第6の変形例について説明する。
図9は、本変形例に係る半導体装置を示す平面図である。
次に、第2の実施形態について説明する。
図10は、本実施形態に係る半導体装置を示す平面図である。
図11は、本実施形態に係る半導体装置を示す断面図である。
次に、第3の実施形態について説明する。
図12は、本実施形態に係る半導体装置を示す平面図である。
図13は、本実施形態に係る半導体装置を示す断面図である。
次に、第4の実施形態について説明する。
図14は、本実施形態に係る半導体装置を示す平面図である。
図14に示すように、本実施形態に係る半導体装置4は、第1の実施形態の第5の変形例に係る半導体装置1e(図8参照)と比較して、デバイス領域RD2の構成が異なっている。
次に、第5の実施形態について説明する。
図15(a)は、本実施形態に係る半導体装置を示す平面図であり、(b)はその断面図である。
次に、第6の実施形態について説明する。
図16は、本実施形態に係る半導体装置を示す平面図である。
次に、第7の実施形態について説明する。
図17は、本実施形態に係る半導体装置を示す平面図である。
10:半導体基板
11:半導体層
12:界面
15:ディープn形領域
16a、16b:n形領域
17a、17b:n形領域
18a、18b:n+形コンタクト領域
19:ガードリング領域
19a、19b、19c、19d:辺部
21:デバイス部分
22:分離領域
25:p形ウェル
26:n形ウェル
30:ディープp形ウェル
31:p形領域
33:ドリフト領域
34:ドレイン拡張領域
35:ドレイン領域
36:p形領域
37:ソース拡張領域
38:ソース領域
39:ボディコンタクト領域
42:ゲート絶縁膜
43:ステップ絶縁膜
44:ゲート電極
45a、45b:側壁
46:層間絶縁膜
47a、47b、47c、47d、47e:コンタクト
48:配線
50:LDMOSの最小単位
51:LDMOS
52:小電流素子
55:STI
61:ディープn形領域
62:ガードリング領域
63:デバイス部分
64:分離領域
101:寄生ダイオード
102:寄生npnトランジスタ
103:寄生npnトランジスタ
GND:接地電位
R1:第1領域
R2:第2領域
R3:第3領域
R4:第4領域
R5:第5領域
R6:第6領域
R7:第7領域
R8:第8領域
RD1、RD2:デバイス領域
Vd:ドレイン電位
Vg:ゲート電位
W1:最も太い部分の幅
W2:最も細い部分の幅
Claims (14)
- 第1導電形の半導体基板と、
前記半導体基板上に設けられた第1導電形の半導体層と、
前記半導体基板と前記半導体層との間に設けられた第2導電形の第1ディープ半導体領域と、
前記第1ディープ半導体領域と共に前記半導体層の第1デバイス部分を囲む第2導電形の第1ガードリング領域と、
前記第1ガードリング領域及び前記第1ディープ半導体領域に接し、前記第1デバイス部分を第1領域及び第2領域に区画する第2導電形の第1分離領域と、
前記第1領域内に設けられた第1導電形の第1半導体領域と、
前記第2領域内に設けられた第1導電形の第2半導体領域と、
を備えた半導体装置。 - 前記第1分離領域の幅は前記第1ガードリング領域の幅よりも細い請求項1に記載の半導体装置。
- 前記第1領域内に設けられた第2導電形の第1ソース領域と、
前記第1領域内に設けられ、前記第1ソース領域から離隔した第2導電形の第1ドレイン領域と、
前記第1領域上に設けられた第1ゲート絶縁膜と、
前記第1ゲート絶縁膜上に設けられた第1ゲート電極と、
をさらに備えた請求項1または2に記載の半導体装置。 - 前記第2半導体領域に流れる電流は、前記第1半導体領域に流れる電流よりも小さい請求項3に記載の半導体装置。
- 前記第2領域内に設けられた第2導電形の第2ソース領域と、
前記第2領域内に設けられ、前記第2ソース領域から離隔した第2導電形の第2ドレイン領域と、
前記第2領域上に設けられた第2ゲート絶縁膜と、
前記第2ゲート絶縁膜上に設けられた第2ゲート電極と、
をさらに備えた請求項3に記載の半導体装置。 - 前記半導体層における前記第1ガードリング領域の外部に配置され、第2導電形の第3半導体領域をさらに備え、
前記第3半導体領域に流れる電流は前記第1半導体領域に流れる電流よりも小さい請求項5に記載の半導体装置。 - 前記半導体基板と前記半導体層との間に設けられ、前記第1ディープ半導体領域から離隔した第2導電形の第2ディープ半導体領域と、
前記第2ディープ半導体領域と共に前記半導体層の第2デバイス部分を囲む第2導電形の第2ガードリング領域と、
前記第2ガードリング領域及び前記第2ディープ半導体領域に接し、前記第2デバイス部分を第3領域及び第4領域に区画する第2導電形の第2分離領域と、
前記第3領域内に設けられた第1導電形の第3半導体領域と、
前記第4領域内に設けられた第1導電形の第4半導体領域と、
をさらに備え、
前記第3半導体領域に流れる電流、及び、前記第4半導体領域に流れる電流は、前記第1半導体領域に流れる電流、及び、前記第2半導体領域に流れる電流よりも小さい請求項5に記載の半導体装置。 - 前記第2ガードリング領域の幅は前記第1ガードリング領域の幅よりも細い請求項7に記載の半導体装置。
- 第1導電形の第3半導体領域をさらに備え、
前記第1分離領域は、前記第1デバイス部分を前記第1領域、前記第2領域及び第3領域に区画し、
前記第3半導体領域は前記第3領域内に設けられた請求項1~8のいずれか1つに記載の半導体装置。 - 第1導電形の第3半導体領域と、
第1導電形の第4半導体領域と、
をさらに備え、
前記第1分離領域は、前記第1デバイス部分を前記第1領域、前記第2領域、第3領域及び第4領域に区画し、
前記第3半導体領域は前記第3領域内に設けられ、
前記第4半導体領域は前記第4領域内に設けられた請求項1~8のいずれか1つに記載の半導体装置。 - 前記第1領域、前記第2領域、前記第3領域、及び、前記第4領域は、一方向に沿って配列された請求項10に記載の半導体装置。
- 前記第1領域、前記第2領域、前記第3領域、及び、前記第4領域は、行列状に配列された請求項10に記載の半導体装置。
- 前記第1領域内に設けられた第1導電形の第2ディープ半導体領域と、
前記第2領域内に設けられた第1導電形の第3ディープ半導体領域と、
をさらに備えた請求項1~12のいずれか1つに記載の半導体装置。 - 前記第1ガードリング領域に接続された第1コンタクトと、
前記第1分離領域に接続された第2コンタクトと、
をさらに備えた請求項1~13のいずれか1つに記載の半導体装置。
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