JP4606713B2 - 半導体装置およびその製造方法 - Google Patents
半導体装置およびその製造方法 Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims description 69
- 238000004519 manufacturing process Methods 0.000 title claims description 18
- 239000011229 interlayer Substances 0.000 claims description 130
- 238000000034 method Methods 0.000 claims description 49
- 229910052751 metal Inorganic materials 0.000 claims description 40
- 239000002184 metal Substances 0.000 claims description 40
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 37
- 239000000758 substrate Substances 0.000 claims description 37
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 32
- 238000005530 etching Methods 0.000 claims description 28
- 238000005268 plasma chemical vapour deposition Methods 0.000 claims description 18
- 229910052757 nitrogen Inorganic materials 0.000 claims description 16
- 230000015572 biosynthetic process Effects 0.000 claims description 11
- 238000009792 diffusion process Methods 0.000 claims description 9
- 238000009832 plasma treatment Methods 0.000 claims description 5
- 239000010410 layer Substances 0.000 description 63
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 53
- 229910052802 copper Inorganic materials 0.000 description 53
- 239000010949 copper Substances 0.000 description 53
- 230000004888 barrier function Effects 0.000 description 30
- 239000007789 gas Substances 0.000 description 27
- 229920002120 photoresistant polymer Polymers 0.000 description 16
- 230000008569 process Effects 0.000 description 11
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 11
- 238000000151 deposition Methods 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 150000001343 alkyl silanes Chemical class 0.000 description 7
- 238000005229 chemical vapour deposition Methods 0.000 description 7
- 239000012535 impurity Substances 0.000 description 6
- 230000005012 migration Effects 0.000 description 6
- 238000013508 migration Methods 0.000 description 6
- 238000005498 polishing Methods 0.000 description 6
- 229910020177 SiOF Inorganic materials 0.000 description 5
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000004544 sputter deposition Methods 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 125000006850 spacer group Chemical group 0.000 description 4
- 229910052715 tantalum Inorganic materials 0.000 description 4
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000012790 adhesive layer Substances 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 229910052734 helium Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 3
- 229910052721 tungsten Inorganic materials 0.000 description 3
- 239000010937 tungsten Substances 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 2
- -1 alkyl compound Chemical class 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000001312 dry etching Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000001272 nitrous oxide Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- MZLGASXMSKOWSE-UHFFFAOYSA-N tantalum nitride Chemical compound [Ta]#N MZLGASXMSKOWSE-UHFFFAOYSA-N 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910015900 BF3 Inorganic materials 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 230000004931 aggregating effect Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- WTEOIRVLGSZEPR-UHFFFAOYSA-N boron trifluoride Chemical compound FB(F)F WTEOIRVLGSZEPR-UHFFFAOYSA-N 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000001459 lithography Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 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
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 239000003870 refractory metal Substances 0.000 description 1
- 230000003252 repetitive effect Effects 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
- 238000004381 surface treatment Methods 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
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- H01L23/522—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames including external interconnections consisting of a multilayer structure of conductive and insulating layers inseparably formed on the semiconductor body
- H01L23/532—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames including external interconnections consisting of a multilayer structure of conductive and insulating layers inseparably formed on the semiconductor body characterised by the materials
- H01L23/53204—Conductive materials
- H01L23/53209—Conductive materials based on metals, e.g. alloys, metal silicides
- H01L23/53228—Conductive materials based on metals, e.g. alloys, metal silicides the principal metal being copper
- H01L23/53238—Additional layers associated with copper layers, e.g. adhesion, barrier, cladding layers
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- H01L21/76802—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
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Description
本発明の実施の形態1であるCMOSFET(Complementary Metal Oxide Semiconductor Field Effect Transistor)の製造方法を図1〜図7に示した半導体基板の要部断面図を用いて工程順に説明する。
本発明の実施の形態2であるCMOSFETの製造方法を図8に示した半導体基板の要部断面図を用いて説明する。
本実施の形態3では、窒素を含有したSiOC膜で配線層間膜15、23およびビア層間膜21を構成し、相対的にリーク電流の小さいSiCN膜でストッパ絶縁膜14,22およびキャップ絶縁膜20を構成するものである。窒素を含有したSiOC膜は、たとえばプラズマCVD法で形成され、その成膜条件は、たとえばrfパワーが200〜1000W、圧力が2〜10Torr、温度が300〜400℃、ガス種がC含有ガス(たとえばアルキルシラン)とO2とN2、またはC含有ガス(たとえばアルキルシラン)とN2O、ガス流量が100〜2000sccmであり、SiCN膜は、たとえばプラズマCVD法で形成され、その成膜条件は、たとえばrfパワーが200〜1000W、圧力が2〜10Torr、温度が300〜400℃、ガス種がC含有ガス(たとえばアルキルシラン)とNH3とHe、ガス流量が100〜2000sccmである。SiCN膜の厚さは、たとえば50nm程度である。
図10に示すように、本実施の形態4では、ストッパ絶縁膜14、22およびキャップ絶縁膜20のそれぞれを、SiCN膜AとSiC膜Bの積層膜で構成する。
前記実施の形態4のように、配線層間膜15、23およびビア層間膜21のそれぞれを、SiOC膜C、SiC膜BおよびSiON膜Dの3層構造で構成した場合は、接着層であるSiC膜Bのエッチング選択比とSiOC膜CおよびSiON膜Dのエッチング選択比が異なるために、配線溝16、25や接続孔24を形成するためのエッチング工程でSiC膜Bがエッチングストッパ膜となり、スループットが低下する問題がある。
前記実施の形態5では、配線層間膜15、23およびビア層間膜21のそれぞれを、SiOC膜CおよびSiON膜Dの2層構造で構成し、かつ両者の接着性を向上させるための各種処理を行ったが、本実施の形態では、図14に示すように、配線層間膜15、23およびビア層間膜21のそれぞれを、SiOC膜CおよびSiOCN膜Eの2層構造で構成する。この場合、SiOCN膜Eの組成は、SiON膜Dに比べてSiOC膜Cに近いので接着性がよいことから、前記実施の形態5で行ったような膜の接着性を向上させるための各種処理が不要となる。
本実施の形態では、図15に示すように、配線層間膜15、23およびビア層間膜21のそれぞれを、SiOCN膜Eで構成する。この場合は、配線層間膜15、23およびビア層間膜21のそれぞれをSiOC膜Cで構成する前記実施の形態1、2に比べて誘電率が高くなるが、配線層間膜15、23およびビア層間膜21のそれぞれを複数の膜で構成する前記実施の形態4〜6に比べて工程が大幅に短縮できる。また、SiOCN膜Eの組成は、SiOC膜Cに比べてSiCN膜Aに近いので、ストッパ絶縁膜14、22およびキャップ絶縁膜20のそれぞれの一部を構成するSiCN膜Aとの界面における接着性の低下も生じ難くなる。なお、誘電率が高くなるのを防ぐため、SiOCN膜E中の窒素濃度は、10atoms%以下にとどめることが望ましい。
2 素子分離領域
3 pウェル
4 nウェル
5 ゲート絶縁膜
6 ゲート電極
7 キャップ絶縁膜
8 サイドウォールスペーサ
9 n型半導体領域
10 p型半導体領域
11 層間絶縁膜
12 接続孔
13 プラグ
14 ストッパ絶縁膜
15 配線層間膜
16 配線溝
17 バリアメタル層
18 銅膜
19 配線
20 キャップ絶縁膜
21 ビア層間膜
22 ストッパ絶縁膜
23 配線層間膜
24 接続孔
25 配線溝
26 バリアメタル層
27 銅膜
28 配線
A SiCN膜
B SiC膜
C SiOC膜
D SiON膜
E SiOCN膜
Claims (15)
- 半導体基板上の層間絶縁膜に形成された溝の内部に金属配線が形成され、前記層間絶縁膜および前記金属配線のそれぞれの上部に、前記配線を構成する金属の拡散を防止するキャップ絶縁膜が形成された半導体装置であって、
前記層間絶縁膜は、SiOC膜と、前記SiOC膜上に形成されたSiC膜と、前記SiC膜上に形成されたSiON膜とからなり、
前記キャップ絶縁膜は、SiCN膜と、前記SiCN膜上に形成されたSiC膜とからなることを特徴とする半導体装置。 - 前記層間絶縁膜の中途部に、前記層間絶縁膜をエッチングして前記溝を形成する際のエッチングストッパとして機能するストッパ絶縁膜が形成され、前記ストッパ絶縁膜は、SiCN膜と、前記SiCN膜上に形成されたSiC膜とからなることを特徴とする請求項1記載の半導体装置。
- 半導体基板上の層間絶縁膜に形成された溝の内部に金属配線が形成され、前記層間絶縁膜および前記金属配線のそれぞれの上部に、前記配線を構成する金属の拡散を防止するキャップ絶縁膜が形成された半導体装置であって、
前記層間絶縁膜は、SiOC膜と、前記SiOC膜上に形成されたSiON膜とからなり、
前記キャップ絶縁膜は、SiCN膜と、前記SiCN膜上に形成されたSiC膜とからなることを特徴とする半導体装置。 - 前記層間絶縁膜の一部を構成する前記SiON膜の窒素含有量は、3〜4atoms%以下であることを特徴とする請求項3記載の半導体装置。
- 前記層間絶縁膜の一部を構成する前記SiON膜の屈折率は、1.485以下であることを特徴とする請求項3記載の半導体装置。
- 前記層間絶縁膜の中途部に、前記層間絶縁膜をエッチングして前記溝を形成する際のエッチングストッパとして機能するストッパ絶縁膜が形成され、前記ストッパ絶縁膜は、SiCN膜と、前記SiCN膜上に形成されたSiC膜とからなることを特徴とする請求項3記載の半導体装置。
- 半導体基板上の層間絶縁膜に形成された溝の内部に金属配線が形成され、前記層間絶縁膜および前記金属配線のそれぞれの上部に、前記配線を構成する金属の拡散を防止するキャップ絶縁膜が形成された半導体装置であって、
前記層間絶縁膜は、SiOC膜と、前記SiOC膜上に形成されたSiOCN膜とからなり、
前記キャップ絶縁膜は、SiCN膜と、前記SiCN膜上に形成されたSiC膜とからなることを特徴とする半導体装置。 - 前記層間絶縁膜の一部を構成する前記SiOCN膜の窒素含有量は、10atoms%以下であることを特徴とする請求項7記載の半導体装置。
- 前記層間絶縁膜の中途部に、前記層間絶縁膜をエッチングして前記溝を形成する際のエッチングストッパとして機能するストッパ絶縁膜が形成され、前記ストッパ絶縁膜は、SiCN膜と、前記SiCN膜上に形成されたSiC膜とからなることを特徴とする請求項7記載の半導体装置。
- 半導体基板上の層間絶縁膜に形成された溝の内部に金属配線が形成され、前記層間絶縁膜および前記金属配線のそれぞれの上部に、前記配線を構成する金属の拡散を防止するキャップ絶縁膜が形成された半導体装置であって、
前記層間絶縁膜は、SiOCN膜からなり、
前記キャップ絶縁膜は、SiCN膜と、前記SiCN膜上に形成されたSiC膜とからなることを特徴とする半導体装置。 - 前記層間絶縁膜は、SiOCN膜と、前記SiOCN膜上に形成されたSiON膜とからなることを特徴とする請求項10記載の半導体装置。
- 前記層間絶縁膜を構成する前記SiOCN膜の窒素含有量は、10atoms%以下であることを特徴とする請求項10記載の半導体装置。
- 前記層間絶縁膜の中途部に、前記層間絶縁膜をエッチングして前記溝を形成する際のエッチングストッパとして機能するストッパ絶縁膜が形成され、前記ストッパ絶縁膜は、SiCN膜と、前記SiCN膜上に形成されたSiC膜とからなることを特徴とする請求項10または11記載の半導体装置。
- 半導体基板上の層間絶縁膜に形成された溝の内部に金属配線が形成され、前記層間絶縁膜および前記金属配線のそれぞれの上部に、前記配線を構成する金属の拡散を防止するキャップ絶縁膜が形成され、
前記層間絶縁膜は、SiOC膜と、前記SiOC膜上に形成されたSiON膜とからなり、
前記キャップ絶縁膜は、SiCN膜と、前記SiCN膜上に形成されたSiC膜とからなる半導体装置の製造方法であって、
前記層間絶縁膜の一部を構成する前記SiOC膜を形成した後、前記SiOC膜の表面をプラズマ処理し、その後、前記SiOC膜上に前記SiON膜を形成することを特徴とする半導体装置の製造方法。 - 前記層間絶縁膜の一部を構成する前記SiOC膜は、成膜温度375℃のプラズマCVD法で堆積することを特徴とする請求項14記載の半導体装置の製造方法。
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