TW574422B - Lead zirconate titanate dielectric thin film composites on metallic foils - Google Patents
Lead zirconate titanate dielectric thin film composites on metallic foils Download PDFInfo
- Publication number
- TW574422B TW574422B TW90110539A TW90110539A TW574422B TW 574422 B TW574422 B TW 574422B TW 90110539 A TW90110539 A TW 90110539A TW 90110539 A TW90110539 A TW 90110539A TW 574422 B TW574422 B TW 574422B
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- TW
- Taiwan
- Prior art keywords
- dielectric
- film module
- thin film
- thin
- patent application
- Prior art date
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- 239000011888 foil Substances 0.000 title claims description 43
- 239000010409 thin film Substances 0.000 title claims description 24
- 239000002131 composite material Substances 0.000 title 1
- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 title 1
- 229910052451 lead zirconate titanate Inorganic materials 0.000 title 1
- 229910052751 metal Inorganic materials 0.000 claims description 38
- 239000002184 metal Substances 0.000 claims description 38
- 239000000758 substrate Substances 0.000 claims description 28
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 18
- 230000004888 barrier function Effects 0.000 claims description 5
- 239000003989 dielectric material Substances 0.000 claims description 4
- 239000010410 layer Substances 0.000 claims 6
- 230000001788 irregular Effects 0.000 claims 1
- MOUPNEIJQCETIW-UHFFFAOYSA-N lead chromate Chemical compound [Pb+2].[O-][Cr]([O-])(=O)=O MOUPNEIJQCETIW-UHFFFAOYSA-N 0.000 claims 1
- 239000002356 single layer Substances 0.000 claims 1
- 239000010408 film Substances 0.000 description 40
- 239000010936 titanium Substances 0.000 description 23
- 239000010935 stainless steel Substances 0.000 description 20
- 229910001220 stainless steel Inorganic materials 0.000 description 20
- 238000000137 annealing Methods 0.000 description 19
- 229910001369 Brass Inorganic materials 0.000 description 18
- 239000010951 brass Substances 0.000 description 18
- 238000000034 method Methods 0.000 description 12
- 229910052719 titanium Inorganic materials 0.000 description 10
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 9
- 238000000151 deposition Methods 0.000 description 9
- 239000003990 capacitor Substances 0.000 description 8
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 6
- 239000002243 precursor Substances 0.000 description 6
- 238000003980 solgel method Methods 0.000 description 6
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 6
- VXUYXOFXAQZZMF-UHFFFAOYSA-N titanium(IV) isopropoxide Chemical compound CC(C)O[Ti](OC(C)C)(OC(C)C)OC(C)C VXUYXOFXAQZZMF-UHFFFAOYSA-N 0.000 description 6
- 229910000990 Ni alloy Inorganic materials 0.000 description 5
- 230000008021 deposition Effects 0.000 description 5
- 229940046892 lead acetate Drugs 0.000 description 5
- 238000004151 rapid thermal annealing Methods 0.000 description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- 229910001200 Ferrotitanium Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000010955 niobium Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- XNWFRZJHXBZDAG-UHFFFAOYSA-N 2-METHOXYETHANOL Chemical compound COCCO XNWFRZJHXBZDAG-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052809 inorganic oxide Inorganic materials 0.000 description 3
- 229910052746 lanthanum Inorganic materials 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 3
- -1 port Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000003746 surface roughness Effects 0.000 description 3
- 229910001928 zirconium oxide Inorganic materials 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000004833 X-ray photoelectron spectroscopy Methods 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910000464 lead oxide Inorganic materials 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- ZTILUDNICMILKJ-UHFFFAOYSA-N niobium(v) ethoxide Chemical compound CCO[Nb](OCC)(OCC)(OCC)OCC ZTILUDNICMILKJ-UHFFFAOYSA-N 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000004528 spin coating Methods 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- ZAFNJMIOTHYJRJ-UHFFFAOYSA-N Diisopropyl ether Chemical compound CC(C)OC(C)C ZAFNJMIOTHYJRJ-UHFFFAOYSA-N 0.000 description 1
- 241000628997 Flos Species 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910000612 Sm alloy Inorganic materials 0.000 description 1
- SZLDWEQDTAROKV-UHFFFAOYSA-N [La].C(C)(C)OC(C)C Chemical compound [La].C(C)(C)OC(C)C SZLDWEQDTAROKV-UHFFFAOYSA-N 0.000 description 1
- KQNKJJBFUFKYFX-UHFFFAOYSA-N acetic acid;trihydrate Chemical compound O.O.O.CC(O)=O KQNKJJBFUFKYFX-UHFFFAOYSA-N 0.000 description 1
- TUCNEACPLKLKNU-UHFFFAOYSA-N acetyl Chemical compound C[C]=O TUCNEACPLKLKNU-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- NKZSPGSOXYXWQA-UHFFFAOYSA-N dioxido(oxo)titanium;lead(2+) Chemical compound [Pb+2].[O-][Ti]([O-])=O NKZSPGSOXYXWQA-UHFFFAOYSA-N 0.000 description 1
- POLCUAVZOMRGSN-UHFFFAOYSA-N dipropyl ether Chemical compound CCCOCCC POLCUAVZOMRGSN-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 229910052747 lanthanoid Inorganic materials 0.000 description 1
- 150000002602 lanthanoids Chemical class 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- SORGMJIXNUWMMR-UHFFFAOYSA-N lanthanum(3+);propan-2-olate Chemical compound [La+3].CC(C)[O-].CC(C)[O-].CC(C)[O-] SORGMJIXNUWMMR-UHFFFAOYSA-N 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 125000002524 organometallic group Chemical group 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 150000004684 trihydrates Chemical class 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/06—Solid dielectrics
- H01G4/08—Inorganic dielectrics
- H01G4/12—Ceramic dielectrics
- H01G4/1209—Ceramic dielectrics characterised by the ceramic dielectric material
- H01G4/1236—Ceramic dielectrics characterised by the ceramic dielectric material based on zirconium oxides or zirconates
- H01G4/1245—Ceramic dielectrics characterised by the ceramic dielectric material based on zirconium oxides or zirconates containing also titanates
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B37/00—Joining burned ceramic articles with other burned ceramic articles or other articles by heating
- C04B37/02—Joining burned ceramic articles with other burned ceramic articles or other articles by heating with metallic articles
- C04B37/021—Joining burned ceramic articles with other burned ceramic articles or other articles by heating with metallic articles in a direct manner, e.g. direct copper bonding [DCB]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/12—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances ceramics
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Power Engineering (AREA)
- Inorganic Chemistry (AREA)
- Structural Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Organic Chemistry (AREA)
- Inorganic Insulating Materials (AREA)
- Laminated Bodies (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Ceramic Capacitors (AREA)
- Semiconductor Memories (AREA)
Description
574422 五、發明説明(1 ) 發明範圍 本發明係關於金屬箔上的晶狀介電薄膜結構。例_ ,此薄箔介電系統之製備可利用溶膠-凝膠法、_ _ 沉積法或有機金屬化學氣相沉積法,於選擇的金_ _ 材上諸如黃銅、舶、鈦及不銹鋼箔沉積PbZrxTi η
Ay (PZT)薄膜。 發明背景 鍩酸鈦酸鉛(PZT)薄膜在電子及光電應用,諸如_ 電記憶裝置、焦電感應裝置、波導調變器及聲敏% _ 上已引起相當大的興趣而成爲具潛力的候選材料。_ 是,現在的PZT薄膜大部分沉積在會限制其潛在應 用範圍之以pt爲基底電極的矽基材上。另一個想g 的結構爲可准許在高頻範圍下操作、具低的介質f員来毛 、低的ESR及具埋入式電容器系統之潛力。 先前已於文獻中報導於金屬基材上沉積介電薄膜的 方法。例如,Saegusa(日本應用物理期刊,第1部, 第36冊,案號11; 1997年11月;第6888-93頁)報 導於鋁、鈦及不銹鋼箔上沉積非晶狀(玻璃狀) PbZro.5Tio.5O3 (PZT)薄膜。但是,產生的產物並不具 有商業應用上所需的必要性質。 發明槪沭 本發明係關於金屬箔上的晶狀介電薄膜結構。例如 ,此介電薄箔系統之製備可利用不同的方法諸如溶 膠-凝膠法、濺射沉積法及有機金屬化學氣相沉積法 574422 五、發明説明(2 ) 於黃銅、鉑、鎳合金、鈦及不銹鋼箔上沉積 PbZrxTiyOz (PZT)薄膜。本發明之晶狀介電薄膜可包 括單晶、多晶及奈米晶狀薄膜,即,具有從奈米程度 至公分程度之不同顆粒尺寸的薄膜。本發明之晶狀介 電薄膜結構具有可用做電容器之優良性質,包括高介 電常數(ε = 400)、低介質損耗(損耗角正切<5%)及低漏 電流(於5伏特下低於5x1 0_7安培)。此外,本發明 之薄膜結構具有高頻性質。 圖式簡單說明 第1圖爲於金屬箔上不同結構的晶狀介電薄膜結構 之示意圖。 第1(a)圖爲由在金屬箔上沉積的晶狀介電薄膜組成 之結構。 第1(b)圖爲由在金屬箔上沉積的晶狀介電薄膜組 成之結構,其亦包括在介電薄膜及金屬箔間插入一障 壁層。 第1(c)圖爲由在金屬箔上沉積的一層或多層不同晶 狀介電薄膜組成結構,其亦包括在介電薄膜及金屬箔 間插入不同的障壁層。 第1(d)圖爲由在金屬箔上沉積的一層或多層不同 晶狀介電薄膜組成之結構,其亦包括除了在介電薄膜 及金屬箔間插入不同的障壁層外,再插入緩衝層。 第1 (e)圖爲提供增加表面積的具體實施例,其中使 用具紋理構造的基材而倂入如於第1 (a)至1 (d)圖所 -4- 574422 五、發明説明(3 ) 插述之不同組合。 第1 (f)圖爲提供增加表面積的具體實施例,其中使 用多孔結構的基材而倂入如於第1(a)至1(d)圖所描 述之不同組合。 第1(g)圖爲許多平行連接之介電金屬箔系統的具 體實施例。 第1(h)圖爲許多串列連接之介電金屬箔系統的具 體實施例。 第2圖爲於選擇的金屬箔上形成之PZT薄膜的介 電常數對選擇的金屬箔之退火溫度的函數圖。薄膜厚 度約660奈米、電極面積爲0.5平方毫米及於室溫 1 〇千赫下測量其介電常數。 第3圖爲介電常數對選擇的金屬箔之頻率的函數圖 ,即,鈦(樣品T600)、不銹鋼(S 5 5 0)及黃銅(B600)。 於室溫含調變電壓200毫伏特的零偏壓下描述及測量 上述的薄膜。 第4圖爲於不同金屬基材的PZT薄膜上之電流電 壓曲線圖。插圖爲I-V 1/2的曲線圖。於室溫下測量其 薄膜厚度約660奈米、電極面積爲0.5平方毫米。 第5(a)-5(c)圖爲介電常數對於不銹鋼(第5(a)圖)、 鈦(第5(b)圖)及黃銅(第5(c)圖)基材上的PZT薄膜之 電場的函數圖,其於室溫及頻率1 〇千赫下測量。 較佳具體實施例之詳細描述__ 晶狀介電薄膜組件包括做爲基材之金屬箔。金屬箔 574422 五、發明説明(4 ) 應該擁有高熔點、具有與pzt相符合的熱膨脹係數 、與PZT具有低的反應性及與PZT具有好的附著力 。其熔點最佳地至少8 5 0 °c。該薄膜組件較佳地與介 電薄膜一起倂入一層或多層障壁層及不同的緩衝層。 於較佳的具體實施例中,介電材料具有化學式 PbZrxTiyOz,其中X及y二者約0.5及z約2.5至約 5 〇 將形成介電質之無機氧化物接合至基材。此氧化物 具有四面體或鈣鈦礦結晶晶格。此無機氧化物可進一 步具有介電性、鐵電性及/或順電性質。 於較佳的具體實施例中,積層板之一爲在二層基材 層間插入無機氧化物;而基材可各別地選自不同型式 的電子導電金屬或不同型式具有熔點至少850 °C之非 導電及電子導電基材。 通常,沉積的氧化物薄膜僅部分地結晶。因爲介電 性質可由薄膜的結晶度來提高,因此經常使用後沉積 熱處理。此可藉由使用石英鹵素燈的快速熱退火、經 雷射輔助的退火(諸如使用激發雷射或二氧化碳雷射) 或電子束退火而達成。 本發明之薄膜或薄板可使用溶膠-凝膠法製得。此 方法爲較佳的方法,因爲其可提供具高純度的薄膜組 件。此外,溶膠-凝膠法使用低的製程溫度。正常的 結晶溫度在5 0 0及7 〇 (TC之間。於金屬基材上沉積 PZT需要低的製程溫度以減少在箔及介電質間之內擴 -6- 574422 五、發明説明(5 ) 散及反應。再者,可利用溶膠-凝膠法簡單地控制組 成物。 本發明使用之介電材料可包括鑭系金屬。較佳地使 用La或Nb。合適的介電質包括由化學式 PbaLbZrxTiyOz表示的那些,其中L爲鑭金屬(較佳地 爲La或Nb)、X及y各別地在從約0.35至約0.65之 間、z從約2.5至約5.0、a從約0 · 9 5至約1 · 2 5及b 從約0.02至約0.10。此介電質可藉由使用醋酸鉛 [Pb(CH3C00)2H20]、正丙氧化锆[Zr(0-nC3H7)4]、異 丙氧化鈦[Ti(0-iC3H7)4]及異丙氧化鑭[La(0-iC3H7)3] 或乙氧化鈮[Nb(OC2H5)5]爲起始材料而製備。於較佳 的方法中,介電質之製備可利用將酸鉛的三水合物溶 解在2-甲氧基乙醇中及於1 l〇°C之真空下將該組成物 除水以獲得醋酸鉛。然後於室溫下將於2-甲氧基乙 醇中的正丙氧化锆及異丙氧化鈦與產生的產物混合, 再於1 1 0 °C的真空下迴流約2至3小時而獲得聚合前 驅物,諸如由化學式P b ( Z r 〇 . 5 2 T i 〇 . 4 8 ) Ο 3表示的那些 。最後,可利用甲苯稀釋、加入適當的保護薄膜不龜 裂之甲醯胺及10莫耳%過量的Pb以補充在最後退火 製程期間損耗的氧化鉛而獲得0 · 3 Μ的貯存溶液。 使用旋轉-塗佈技術於不同的金屬箔上沉積ρ ζ τ溶 液,諸如鈦范(厚度(d)爲0.054笔米’表面粗糙度 (Ra)爲550奈米);錦箔(d = 0.05毫米,Ra = 200奈米) 574422 五、發明説明(6 )
;不銹鋼箔(d = 〇.〇52毫米,Ra = 5 40奈米);黃銅片 (d=1.2毫米,Ra = 60奈米),或錬合金片(d-1.5笔米 ,Ra^800奈米)。在沉積前使用諸如丙酮(於超音波 淸潔器中)淸潔基材以移除油。典型地使用2000rpm 的旋轉速度3 0秒。每層於旋轉後在2 0 0 °C的加熱板 上乾燥5-10分鐘。每層厚度約110奈米。然後於 45 0°C下加熱沉積的薄膜20分鐘,再於600 °C下使用 快速熱退火(RTA)結晶30分鐘。 本發明之薄膜組件的介電常數可大於400。誘導鐵 電、介電及/或順電相之轉換以獲得想要的高薄膜介 電常數値。此轉換之開始依退火溫度而定。因此,於 高溫下退火該產物直到其結晶。通常地,退火溫度在 從約600°C至約8 00 °C之間。較高的退火溫度趨向於 增加薄膜中的平均顆粒尺寸。 實例
實例1 LZT前驅物之製備。 用來製備PZT薄膜的起始材料有[pb(CH3CO)2H2〇] 、正丙氧化锆[Zr(0-nC3H7)4]、異丙氧化鈦 [Ti(0-iC3H7)4]及異丙氧化鑭[La(〇-ic3H7)3]或乙氧化 鈮[Nb(OC2H5)5]。 基本上PZT貯存溶液之製備可利用將醋酸鉛的三 水合物溶解在2-甲氧基乙醇中及於n(rc真空下除水 以獲得醋酸鉛。然後於室溫下與於甲氧基乙醇中
574422 五、發明説明(7 ) 的正丙氧化銷及異丙氧化鈦混合。將Zr + Ti溶液加入 醋酸鉛然後於1 1 0 °C的周圍真空下迴流二至三個小時 ,及將產物做最後地蒸發。可獲得Pb(ZrG.52Ti().48)03 聚合前驅物。最後,以甲苯稀釋、加入適當的保護薄 膜不龜裂之甲醯胺及10莫耳%過量的Pb以補充在最 後退火製程期間氧化鉛的損耗而獲得〇·3Μ的貯存溶 液。 沉積 然後使用旋轉-塗佈技術將pzt前驅物溶液沉積到: 鈦箔(厚度(d) = 0.54毫米,表面粗糙度(Ra = 5 5 0奈 米); 鋁箔((d) = 0.05毫米,Ra = 200奈米); 不銹鋼箔(d = 0.052,Ra = 540奈米); 黃銅片(d=1.2毫米,Ra = 60奈米); 鎳合金片(d=1.5毫米,Ra=800奈米)。 在沉積之前,較佳地在超音波下使用丙酮淸潔基材 以除油,於旋轉速度2000rpm下旋轉30秒。每層於 旋轉後在2 0 0 °C的加熱板上乾燥5 -1 0分鐘。每層厚 度約1 1 0奈米。 熱處理 然後將沈積的薄膜於4 5 0 °C下加熱2 0分鐘,再於 60 0°C下使用快速熱退火(RTA)結晶30分鐘。 最佳的是於此方法中使用的全部反應物皆爲高純度 。通常,其純度大於90%,較佳地大於95%,最佳地 574422 五、發明説明(8 ) 大於9 9 %。此外,最好於無氮大氣氛中進行本發明之 各別步驟。 獲得及測試的樣品則列於表1。 表1 樣品規則 Ti550 Ti600 Ti650 BR600 SS550 SS600 SS650 基材 鈦 黃銅 不銹鋼 薄膜前驅物 於甲苯中之PZT聚合物(如描述於實驗部分) 退火溫度(°c) 550 600 650 600 550 600 650 介電常數 288 480 256 305 192 165 150 PZT厚度(奈米) 660 於室溫含調變電壓200毫伏之零偏壓下測量該薄膜 組件。第2圖說明退火溫度對沉積在選擇的金屬箔基 材上之PZT薄膜的介電常數之影響。 實例2 以如於實例1所提來製備PZT前驅物。然後利用 旋轉-塗佈將6 5 0奈米厚的PZT薄膜塗佈到不同金屬 箔上,其包括鈦箔(厚度d = 0.4毫米,表面粗糙度,
Ru = 5 5 0奈米)、鋁箔(d = 0.05毫米,Ru = 3 00奈米)、 不銹鋼箔(SS)(d = 0.042,Ru = 400奈米)、黃銅片(BR) (d=1.2毫米,Ru = 60奈米)及鎳合金片(NK)(d=1.5毫 米,Ru = 800奈米)。使用面積爲5xl0_3平方公分含
蒸鍍的Au之頂端電極來測量其介電性質。使用HP 4275A LCR計量器及HP 4140B皮安計於室溫下完成 電容-電壓(C-V)、電容-頻率(C-f)及電流-電壓(I-V)之 測量。使用Radiant RT 60 00S鐵電測試系統檢測磁滯 10- 574422 五、發明説明(9 ) 性質。 表2總整理出於選擇的基材上之室溫介電性質的測 量結果: 表2 基材樣品編碼退火溫度介電常數介質損耗分解電壓於1伏特
rc) (10千赫)(%)(1〇千赫)(千伏/公分)時的DC 阻抗(GQ) 鈦 Ti600 600 400 4.0 600 5000 不銹鋼 SS650 650 155 15 590 0.25 黃銅 BR600 600 256 4.8 288 0.13 鎳合金 NK600 600 20 2.1 7000
X-射線光電子光譜(XPS)顯示出於Ti箔上的PZT 薄膜具有Ti/TiOx/PZT結構。此類似於在Ti及PZT 間形成含相當低的介電常數(ε<80)之氧化鈦(TiOx)層。
第3圖爲介電常數及損耗對頻率之函數圖。這些電 容系統具有優良的頻率特徵,其實際上剩餘的介電常 數可上至1百萬赫茲。這些類型的電容器具有在高頻 應用上的潛力。 第2圖爲介電常數及損耗對PZT退火溫度之函數 圖。對PZT/Ti箔來說,最理想的退火溫度約600°C ’對此溫度下可獲得較高的介電常數及低損耗。若大 於此溫度,則介電常數會隨著退火溫度的增加而減少 。此可歸因於氧化鈦的厚度會隨著退火溫度增加。若 該箔爲不銹鋼時,介電常數會減少,但是介質損耗會 隨著退火溫度在5 5 0 · 7 0 0 °C的範圍內增加而大大地增 -11- 574422 五、發明説明(1G ) 力口。此反映了會增加擴散進PZT薄膜的Cr及Ni濃 度。退火溫度愈高會使得N i及C r的擴散愈深。 第3圖爲以不銹鋼(SS600)及黃銅(BR600)爲基底的 電容器之電流-電壓曲線圖。鈦(Ti 6 5 0)及不銹鋼 (SS600)電容器顯示出上至5伏的最低漏電流,1〇_12 安培至1〇_8安培。於第3圖的插圖中之資料爲標準 的蕭特基圖,其中全部的資訊遵循l〇g(I/T2) = AV1/2 ,其中I爲電流、T爲溫度、V爲施加的電壓及A爲 常數。於T i 6 5 0電容器的實例中,有二種不同的斜率 。此特性再次大約地反映出在PZT及Ti箔間的氧化 鈦層。 第5(a)至5(c)圖爲不同的金屬基材於10千赫下其 介電常數對電場的函數圖。於鈦(第5(b)圖)、不銹鋼 (第5(a)圖)及黃銅(第5(c)圖)之金屬基材上的ε-Ε特 徵相當地不同。對不銹鋼的ΡΖΤ來說,C-V性質爲典 型的鐵電性材料。於25千伏/公分的矯頑場下可獲 得最大約1 50的介電常數。黃銅基材的資料意謂著在 高溫退火後,在ΡΖΤ及黃銅間的介面處形成半導層。 所述之實例爲使用溶膠-凝膠法及退火於鈦、不銹 鋼、黃銅及鎳合金基材上製造鐵電性ΡΖΤ薄膜。於 這些基材上之ΡΖΤ薄膜並無龜裂,同時顯示出具強 的附著力且無任何去積層的跡象。可獲得具相當高介 電常數(ε = 400)、低介質損耗(tgS<5%)、低漏電流(於 5伏下U<5 xl 0_8安培)及高分解場強度之電容器。於 -12- 574422 五、發明説明(11 ) 鈦、不銹鋼及黃銅基材上的電容器實例中可觀察到具 優良的高頻性質。 可於本文中描述的本質、組成物、操作及不同元件 的安排,步驟及程序上做不同的修改而沒有脫離如於 下列申請專利範圍中定義的本發明之精神及範圍。 -13-
Claims (1)
- 修正替換本 年4月斗B 第90 1 1 0539號「金屬箔上鉻酸鈦酸鉛介電薄膜組件」專 利案 (92年4月修正) 六申請專利範圍: 1· 一種多層薄膜組件’其包括一金屬箱基材及至少一 層晶狀介電I層,該介電質係PbZrxTiy0z :、 .PbaLabZrxTiyOz 或 PbaNbbZrxTiyOz,其中 X 和 y 各爲 介於0.35至0.65之間,z爲2. 5至5.0,a爲0.95 至.25,b爲0.02至〇.1〇,且該介電質的厚度爲介 於1〇〇至1〇〇〇奈米之間。 2_如申請專利範圍第1項之薄膜組件,其中該金屬箔爲 元素金屬。 3.如申請專利範圍第2項之薄膜組件,其中該金屬箔可 具有平坦的表面、具紋理構造的表面或大孔的表面。1 4·如申請專利範圍第1項之薄膜組件,其中該介電質層 由單層的介電材料組成。 5.如申請專利範圍第1項之薄膜組件,其中該介電質層 由多層具規則或不規則的超晶格結構之介電質材料戶斤 組成。 6·如申請專利範圍第1至5項中任一項之薄膜組件,其 中在金屬箔基材及介電質層間插設一障壁層。 7·如申請專利範圍第1項之薄膜組件,其中X及y爲 0.5,而 z 爲 3。 -1 - — 一 ~ ^ 574422 六、申請專利範圍 8. 如申請專利範圍第 1項之薄膜組件,其中X爲 0.4 8 ’ y 爲 0 . 5 2,而 z 爲 3。 9. 如申請專利範圍第 1項之薄膜組件,其中薄膜具有 至少400的介電常數。 10. 如申請專利範圍第 1項之薄膜組件,其中金屬箔基 材爲具有增加表面積的紋理構造基材。 11. 如申請專利範圍第1項之薄膜組件,其更包括平行 連接的介電質金屬箔系統或串列連接的介電質金屬 箱系統。
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