JP5524905B2 - パワー半導体素子用Al合金膜 - Google Patents
パワー半導体素子用Al合金膜 Download PDFInfo
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- JP5524905B2 JP5524905B2 JP2011110791A JP2011110791A JP5524905B2 JP 5524905 B2 JP5524905 B2 JP 5524905B2 JP 2011110791 A JP2011110791 A JP 2011110791A JP 2011110791 A JP2011110791 A JP 2011110791A JP 5524905 B2 JP5524905 B2 JP 5524905B2
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- 229910000838 Al alloy Inorganic materials 0.000 title claims description 101
- 239000004065 semiconductor Substances 0.000 title claims description 67
- 239000000758 substrate Substances 0.000 claims description 34
- 238000005477 sputtering target Methods 0.000 claims description 13
- 229910052804 chromium Inorganic materials 0.000 claims description 6
- 229910052735 hafnium Inorganic materials 0.000 claims description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims description 6
- 229910052758 niobium Inorganic materials 0.000 claims description 6
- 229910052697 platinum Inorganic materials 0.000 claims description 6
- 229910052702 rhenium Inorganic materials 0.000 claims description 6
- 229910052715 tantalum Inorganic materials 0.000 claims description 6
- 229910052719 titanium Inorganic materials 0.000 claims description 6
- 229910052721 tungsten Inorganic materials 0.000 claims description 6
- 229910052720 vanadium Inorganic materials 0.000 claims description 6
- 229910052726 zirconium Inorganic materials 0.000 claims description 6
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000010408 film Substances 0.000 description 129
- 238000010438 heat treatment Methods 0.000 description 117
- 239000011159 matrix material Substances 0.000 description 25
- 239000002245 particle Substances 0.000 description 23
- 239000010410 layer Substances 0.000 description 21
- 238000004519 manufacturing process Methods 0.000 description 15
- 239000000203 mixture Substances 0.000 description 13
- 229910045601 alloy Inorganic materials 0.000 description 12
- 239000000956 alloy Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 12
- 230000015572 biosynthetic process Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 8
- 239000011261 inert gas Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 6
- 239000013078 crystal Substances 0.000 description 6
- 238000009616 inductively coupled plasma Methods 0.000 description 6
- 230000000007 visual effect Effects 0.000 description 6
- 239000010409 thin film Substances 0.000 description 5
- 230000008018 melting Effects 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008646 thermal stress Effects 0.000 description 4
- 230000005856 abnormality Effects 0.000 description 3
- -1 and / or Si Chemical compound 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000001755 magnetron sputter deposition Methods 0.000 description 3
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 3
- 238000004544 sputter deposition Methods 0.000 description 3
- 229910021364 Al-Si alloy Inorganic materials 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- 229910000927 Ge alloy Inorganic materials 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 210000000746 body region Anatomy 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 235000012489 doughnuts Nutrition 0.000 description 1
- 238000009429 electrical wiring Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- 238000007733 ion plating Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000003870 refractory metal Substances 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
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000009718 spray deposition Methods 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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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
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- H01L23/53219—Aluminium alloys
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- C22C21/12—Alloys based on aluminium with copper as the next major constituent
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
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- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/14—Metallic material, boron or silicon
- C23C14/16—Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon
- C23C14/165—Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon by cathodic sputtering
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- H01L21/2855—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic Table by physical means, e.g. sputtering, evaporation
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Description
(a)Alマトリックスの最大粒径が800nm以下
(b)ヒロック密度が1×109個/m2未満
(c)電気抵抗率が10μΩcm以下
(a)Alマトリックスの最大粒径が800nm以下
(b)ヒロック密度が1×109個/m2未満
(c)電気抵抗率が10μΩcm以下
(a)Alマトリックスの最大粒径が800nm以下
(b)ヒロック密度が1×109個/m2未満
(c)電気抵抗率が10μΩcm以下
表1および表2に示す種々の合金組成のAl合金膜(膜厚=500nm)を、DCマグネトロン・スパッタ法にて、雰囲気ガス=アルゴン、圧力=2mTorr、基板温度=25℃(室温)の条件で成膜した。基板として、単結晶シリコン基板(面方位100)を使用した(基板のサイズは直径4インチである)。
成膜後のAl合金膜に対し、不活性ガス(N2)雰囲気下にて、表1および表2に示す通り、半導体素子の製造工程で配線材料に加わる熱処理を模擬して、450℃、500℃、550℃、600℃の各温度で30分間保持する加熱処理(1回目の熱処理)を行い、次いで表1および表2に示す通り500℃で30分間保持する加熱処理(2回目の熱処理、加熱パターン1)を行った。そして、加熱処理後のAl合金膜の表面性状を光学顕微鏡(倍率:500倍)で観察し、ヒロック密度(個/m2)を測定した。尚、この測定では、直径0.1μm以上のヒロックを対象とした。
成膜後のAl合金膜に10μm幅のラインアンドスペースパターンを形成したものに対し、不活性ガス(N2)雰囲気下にて、表1および表2に示す通り、半導体素子の製造工程で配線材料に加わる熱処理を模擬して、450℃、500℃、550℃、600℃の各温度で30分間保持する加熱処理(1回目の熱処理)を行い、次いで表1および表2に示す通り500℃で30分間保持する加熱処理(2回目の熱処理、加熱パターン1)を行ってから、4端子法で電気抵抗率を測定した。
成膜後のAl合金膜に対し、不活性ガス(N2)雰囲気下にて、表1および表2に示す通り、半導体素子の製造工程で配線材料に加わる熱処理を模擬して、450℃、500℃、550℃、600℃の各温度で30分間保持する加熱処理(1回目の熱処理)を行い、次いで500℃で30分間保持する加熱処理(2回目の熱処理)を行った。そして加熱処理後のAl合金膜の表面を、平面TEM(透過電子顕微鏡、倍率15万倍)で観察した。
観察は、各サンプルの任意の場所において、3視野(一視野は1.2μm×1.6μm)行い、3視野中に観察されるAlマトリックス粒径(円相当直径)の最大値を最大粒径とした。
表4および表5に示す種々の合金組成のAl合金膜(膜厚=500nm)を、DCマグネトロン・スパッタ法にて、雰囲気ガス=アルゴン、圧力=2mTorr、基板温度=25℃(室温)の条件で成膜した。基板として、単結晶シリコン基板(面方位100)を使用した(基板のサイズは直径4インチである)。
成膜後のAl合金膜に対し、不活性ガス(N2)雰囲気下にて、半導体素子の製造工程で配線材料に加わる熱処理を模擬して、表4および表5に示す通り450℃、500℃、550℃、600℃の各温度で30分間保持する加熱処理(1回目の熱処理)を行い、次いで、実使用環境時で加わる熱処理を模擬して、表4および表5に示す通り300℃で5時間保持する加熱処理を5回繰り返し施した(2回目の熱処理、加熱パターン2、一部の試料については、加熱処理の回数を10回または30回とした)。そして加熱処理後のAl合金膜の表面性状を光学顕微鏡(倍率:500倍)で観察し、ヒロックの密度(個/m2)を測定した。尚、この測定では、直径0.1μm以上のヒロックを対象とした。
成膜後のAl合金膜に10μm幅のラインアンドスペースパターンを形成したものに対し、不活性ガス(N2)雰囲気下にて、半導体素子の製造工程で配線材料に加わる熱処理を模擬して、表4および表5に示す通り450℃、500℃、550℃、600℃の各温度で30分間保持する加熱処理(1回目の熱処理)を行い、次いで、実使用環境時で加わる熱処理を模擬して、表4および表5に示す通り300℃で5時間保持する加熱処理を5回繰り返し施してから(2回目の熱処理、加熱パターン2、一部の試料については、加熱処理の回数を10回または30回とした)、4端子法で電気抵抗率を測定した。
成膜後のAl合金膜に対し、不活性ガス(N2)雰囲気下にて、半導体素子の製造工程で配線材料に加わる熱処理を模擬して、表4および表5に示す通り450℃、500℃、550℃、600℃の各温度で30分間保持する加熱処理(1回目の熱処理)を行った後、実使用環境時で加わる熱処理を模擬して、表4および表5に示す通り300℃で5時間保持する加熱処理を5回繰り返し施した(2回目の熱処理、加熱パターン2、一部の試料については、加熱処理の回数を10回または30回とした)。そして加熱処理後のAl合金膜の表面を平面TEM(透過電子顕微鏡、倍率15万倍)で観察した。観察は、各サンプルの任意の場所において、3視野(一視野は1.2μm×1.6μm)行い、3視野中に観察されるAlマトリックス粒径(円相当直径)の最大値を最大粒径とした。
表6に示す種々の合金組成のAl合金膜を、表6に示す通り膜厚を変えて(膜厚=600nm〜4μm)、DCマグネトロン・スパッタ法にて、雰囲気ガス=アルゴン、圧力=2mTorr、基板温度=25℃(室温)の条件で成膜した。基板として単結晶シリコン基板(面方位100)を使用した(基板のサイズは直径4インチである)。
Claims (7)
- 金属成分として、Ta、Nb、Re、Zr、W、Mo、V、Hf、Ti、CrおよびPtよりなる群(X群)から選択される少なくとも一種の元素(X群元素)を0.1〜5原子%と、Siおよび/またはGeを0.1〜3原子%含み、更に、Niおよび/またはCoを0.1〜3原子%含むことを特徴とするパワー半導体素子用Al合金膜。
- 膜厚が500nm〜5μmである請求項1に記載のパワー半導体素子用Al合金膜。
- 更に、Cuを0.1〜2原子%含む請求項1または2に記載のパワー半導体素子用Al合金膜。
- 請求項1〜3のいずれかに記載のパワー半導体素子用Al合金膜を形成するためのスパッタリングターゲットであって、
Ta、Nb、Re、Zr、W、Mo、V、Hf、Ti、CrおよびPtよりなる群(X群)から選択される少なくとも一種の元素(X群元素)を0.1〜5原子%含むと共に、Siおよび/またはGeを0.1〜3原子%含み、更に、Niおよび/またはCoを0.1〜3原子%含み、残部がAlおよび不可避的不純物であることを特徴とするスパッタリングターゲット。 - 更に、Cuを0.1〜2原子%含むものである請求項4に記載のスパッタリングターゲット。
- 基板上に少なくとも、請求項1〜3のいずれかに記載のパワー半導体素子用Al合金膜を備えたパワー半導体構造であって、
前記基板と前記Al合金膜が直接接触していることを特徴とするパワー半導体構造。 - 前記基板は、Si基板、SiC基板、またはGaN基板である請求項6に記載のパワー半導体構造。
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CN201280022035.4A CN103534789B (zh) | 2011-05-17 | 2012-05-16 | 半导体装置用Al合金膜 |
PCT/JP2012/062561 WO2012157688A1 (ja) | 2011-05-17 | 2012-05-16 | 半導体装置用Al合金膜 |
US14/117,531 US9153536B2 (en) | 2011-05-17 | 2012-05-16 | Al alloy film for semiconductor device |
EP12786105.2A EP2711973A4 (en) | 2011-05-17 | 2012-05-16 | ALUMINUM ALLOY FILM FOR SEMICONDUCTOR DEVICES |
KR1020137030136A KR20140000718A (ko) | 2011-05-17 | 2012-05-16 | 반도체 장치용 Al 합금막 |
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US20150171016A1 (en) | 2015-06-18 |
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TW201310512A (zh) | 2013-03-01 |
WO2012157688A1 (ja) | 2012-11-22 |
TWI523087B (zh) | 2016-02-21 |
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