JPWO2017069255A1 - エピタキシャル成長用基板及びその製造方法 - Google Patents
エピタキシャル成長用基板及びその製造方法 Download PDFInfo
- Publication number
- JPWO2017069255A1 JPWO2017069255A1 JP2017545817A JP2017545817A JPWO2017069255A1 JP WO2017069255 A1 JPWO2017069255 A1 JP WO2017069255A1 JP 2017545817 A JP2017545817 A JP 2017545817A JP 2017545817 A JP2017545817 A JP 2017545817A JP WO2017069255 A1 JPWO2017069255 A1 JP WO2017069255A1
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- JP
- Japan
- Prior art keywords
- copper layer
- substrate
- epitaxial growth
- rolling
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- KERTUBUCQCSNJU-UHFFFAOYSA-L nickel(2+);disulfamate Chemical compound [Ni+2].NS([O-])(=O)=O.NS([O-])(=O)=O KERTUBUCQCSNJU-UHFFFAOYSA-L 0.000 description 1
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 description 1
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- 230000001590 oxidative effect Effects 0.000 description 1
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
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- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Images
Classifications
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- B32B15/015—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium the said other metal being copper or nickel or an alloy thereof
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- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
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- H10N60/0296—Processes for depositing or forming copper oxide superconductor layers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
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- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
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- Metallurgy (AREA)
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Abstract
Description
XRD測定による積層前の銅層及び積層後の銅層の(200)面の割合をそれぞれI0Cu、I0CLADとし、積層前の銅層及び積層後の銅層の(220)面の割合をそれぞれI2Cu、I2CLADとしたとき、I0Cu<20%、I2Cu=70〜90%であり、且つ、I0CLAD<20%、I2CLAD=70〜90%及びI0CLAD−I0Cu<13%となるように積層する、前記エピタキシャル成長用基板の製造方法。
(2)配向化熱処理を行った後の銅層の表面において、表面から3μm以内に存在する(200)面以外の結晶方位を持つ結晶粒が占める面積が1.5%未満である上記(1)に記載のエピタキシャル成長用基板の製造方法。
(3)機械研磨による厚み方向への切削量が2μm〜5μmである上記(1)又は(2)に記載のエピタキシャル成長用基板の製造方法。
(4)機械研磨を施す工程が、バフ研磨を含む上記(1)〜(3)のいずれかに記載のエピタキシャル成長用基板の製造方法。
(5)表面活性化接合にて積層する工程が、金属基材及び銅層を圧延ロールにより接合して行われ、機械研磨を施す工程が、ロール式バフ研磨によって圧延方向と同方向に研磨を施した後、鏡面ロールによる圧下率0〜1%の軽圧延を施すことにより行われ、機械研磨を施した後の銅層において、AFM測定による単位長さ60μm当たりの圧延方向と同方向に沿った表面粗度がRa1<10nmであり、圧延方向と直角方向に沿った表面粗度がRa2<30nmである上記(1)〜(4)のいずれかに記載のエピタキシャル成長用基板の製造方法。
なお、ここで「圧延方向と同方向に研磨を施す」とは、研磨時における金属基材及び銅層からなる積層材の送り方向を、圧延方向と同方向にすることを意味する。研磨に用いるロールの回転方向は、積層材の送り方向に対し順方向としても良く、あるいは切削量を大きくするために逆方向としても良い。
(6)金属基材及び銅層が積層され、銅層の表面において、表面から3μm以内に存在する(200)面以外の結晶方位を持つ結晶粒が占める面積が1.5%未満であるエピタキシャル成長用基板。
(7)金属基材及び銅層が積層され、さらに銅層に対しニッケル又はニッケル合金からなる保護層が積層され、保護層の表面において、(200)面以外の結晶方位を持つ結晶粒が占める割合が2.0%未満であるエピタキシャル成長用基板。
(ワット浴)
硫酸ニッケル 200〜300g/l
塩化ニッケル 30〜60g/l
ホウ酸 30〜40g/l
pH 4〜5
浴温 40〜60℃
(スルファミン酸浴)
スルファミン酸ニッケル 200〜600g/l
塩化ニッケル 0〜15g/l
ホウ酸 30〜40g/l
添加剤 適量
pH 3.5〜4.5
浴温 40〜70℃
まず、金属基材としてSUS316L(厚さ100μm)を用い、これに高圧下率(圧下率96〜99%)で冷間圧延した銅箔(厚さは表1に示すとおり)を表面活性化接合法により0.05〜1PaのArガス雰囲気中でスパッタエッチング処理を行った後0.1〜1%の圧下率にて冷間圧接して積層材を作製した。スパッタエッチング処理は、実施例では出力100Wの装置を2個設置、比較例では出力160Wの装置を2個設置して行った。処理時間はいずれもトータルで30秒とした。
次に、実施例1により得られた異常部を有さないエピタキシャル成長用基板と、比較例1により得られた異常部を有するエピタキシャル成長用基板のそれぞれに、ニッケルめっきを施して保護層を形成した。これにより得られたものを、それぞれ実施例5及び比較例3とする。そして、実施例5及び比較例3に係るエピタキシャル成長用基板について、保護層表面の光学顕微鏡観察を行った。その結果を図7及び図8に示す。それぞれの図中、(a)は光学顕微鏡像を表し、(b)はそれを2値化処理したものを表す。2値化処理を経て算出された保護層表面における(200)面以外の結晶方位を持つ結晶粒が占める割合は、実施例5が0.9%、比較例3が3%となり、本願発明のエピタキシャル成長用基板においては高度な結晶配向性が得られていることが示された。保護層表面の表面粗度を測定したところ、実施例5の単位面積60×60μm2当たりの表面粗度Ra(Ni)は19.5nm、比較例3の表面粗度Ra(Ni)は23nmであった。
鏡面ロールによる軽圧延における、圧下率の影響について調査した。
2 銅層
3 スパッタエッチング装置
4 冷却ロール
5 圧延ロール
10 金属基材
20 銅層
21 (200)面に配向した銅層
30 研磨輪
a1 再結晶した部位
a2 加工ひずみ
a3 異常部
Claims (7)
- 金属基材及びfcc圧延集合組織を有する銅層を表面活性化接合にて積層する工程と、銅層に機械研磨を施す工程と、銅層の配向化熱処理を行う工程とを含むエピタキシャル成長用基板の製造方法であって、
XRD測定による積層前の銅層及び積層後の銅層の(200)面の割合をそれぞれI0Cu、I0CLADとし、積層前の銅層及び積層後の銅層の(220)面の割合をそれぞれI2Cu、I2CLADとしたとき、I0Cu<20%、I2Cu=70〜90%であり、且つ、I0CLAD<20%、I2CLAD=70〜90%及びI0CLAD−I0Cu<13%となるように積層する、前記エピタキシャル成長用基板の製造方法。 - 配向化熱処理を行った後の銅層の表面において、表面から3μm以内に存在する(200)面以外の結晶方位を持つ結晶粒が占める面積が1.5%未満である請求項1に記載のエピタキシャル成長用基板の製造方法。
- 機械研磨による厚み方向への切削量が2μm〜5μmである請求項1又は2に記載のエピタキシャル成長用基板の製造方法。
- 機械研磨を施す工程が、バフ研磨を含む請求項1〜3のいずれかに記載のエピタキシャル成長用基板の製造方法。
- 表面活性化接合にて積層する工程が、金属基材及び銅層を圧延ロールにより接合して行われ、機械研磨を施す工程が、ロール式バフ研磨によって圧延方向と同方向に研磨を施した後、鏡面ロールによる圧下率0〜1%の軽圧延を施すことにより行われ、機械研磨を施した後の銅層において、AFM測定による単位長さ60μm当たりの圧延方向と同方向に沿った表面粗度がRa1<10nmであり、圧延方向と直角方向に沿った表面粗度がRa2<30nmである請求項1〜4のいずれかに記載のエピタキシャル成長用基板の製造方法。
- 金属基材及び銅層が積層され、銅層の表面において、表面から3μm以内に存在する(200)面以外の結晶方位を持つ結晶粒が占める面積が1.5%未満であるエピタキシャル成長用基板。
- 金属基材及び銅層が積層され、さらに銅層に対しニッケル又はニッケル合金からなる保護層が積層され、保護層の表面において、(200)面以外の結晶方位を持つ結晶粒が占める割合が2.0%未満であるエピタキシャル成長用基板。
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