TWI304315B - - Google Patents

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Publication number
TWI304315B
TWI304315B TW092123058A TW92123058A TWI304315B TW I304315 B TWI304315 B TW I304315B TW 092123058 A TW092123058 A TW 092123058A TW 92123058 A TW92123058 A TW 92123058A TW I304315 B TWI304315 B TW I304315B
Authority
TW
Taiwan
Prior art keywords
forming
solder bump
film
substrate
layer
Prior art date
Application number
TW092123058A
Other languages
English (en)
Other versions
TW200405784A (en
Inventor
Masaru Ohta
Katsumi Inomata
Shinichiro Iwanaga
Original Assignee
Jsr Corp
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Publication date
Application filed by Jsr Corp filed Critical Jsr Corp
Publication of TW200405784A publication Critical patent/TW200405784A/zh
Application granted granted Critical
Publication of TWI304315B publication Critical patent/TWI304315B/zh

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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00Apparatus or processes for manufacturing printed circuits
    • H05K3/40Forming printed elements for providing electric connections to or between printed circuits
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    • H01L24/10Bump connectors ; Manufacturing methods related thereto
    • H01L24/12Structure, shape, material or disposition of the bump connectors prior to the connecting process
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    • H01L24/11Manufacturing methods
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00Apparatus or processes for manufacturing printed circuits
    • H05K3/30Assembling printed circuits with electric components, e.g. with resistor
    • H05K3/32Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
    • H05K3/34Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
    • H05K3/3457Solder materials or compositions; Methods of application thereof
    • H05K3/3485Applying solder paste, slurry or powder
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Description

1304315 (1) 玫、發明說明 【發明所屬之技術領域】 本發明爲關於對多層印刷電路基板裝配1C晶片時所使 用之焊料凸點等之低熔點金屬焊料凸點的形成方法。 【先前技術】 於1C晶片側形成焊料凸點之例有BGA ( Ball Grid Array,焊球網格陣列),其一般而指封裝基板上己搭載 1C晶片的形態。 最近之高密度化裝配之一形態爲稱爲WL - CSP ( Wafer Level Chip Size Package,晶圓級晶片大小封裝) 之技術。此WL — CSP爲於一枚晶圓上形成數個1C晶片的電 路後,以晶圓之狀態,一倂實施電極形成、封裝、及初始 運行(burn— in )試驗後,將1C晶片以封裝型式予以切分 之技術。 於WL - CSP中一倂進行電極形成之技術可列舉電鍍法 ,將金屬漿料埋入後進行逆流之方法,將金屬球載置後進 行逆流之方法。 隨著1C晶片的高集成化,1C晶片的焊料凸點乃發展成 高密度化及小型化。於上述之WL - C S P之裝配技術中,乃 進行可令接續信賴性、加工費用降低兩相成立之焊料凸點 的檢討及實用化。具體而言,將液狀之正/負型光阻物或 乾式薄膜形成5 0 // m以上之膜厚,其次予以圖案化,並 將其做爲光罩材料進行電鍍之方法等。 (2) 1304315 另一*力面,於多層印刷電路基板側形成焊料凸點時, 因爲此些焊料凸點彼此未熔黏,故於電路基板上施以焊料 光阻層。於此焊料光阻層上,於電極底座之對應位置設置 開□部。於焊料光阻層上形成焊料凸點時,進行焊錫漿料 的光罩印刷。光罩印刷中所用之光罩爲在焊料光阻層開口 部的對應位置配置圖案(開口圖案)。進行光罩印刷時, 將此光罩令光罩圖案與焊料光阻層開口部對應載置。其後 ,透過此光罩,將焊錫漿料印刷至電極底座上的焊料光阻 層開口部。其後,令焊錫漿料逆流,於電極底座上形成焊 料凸點。 以焊料光阻上再將可剝離的焊料光阻物(特開平 1 0 - 3 5 02 3 0號公報)疊層,並再於前述焊料光阻物將乾式 薄膜予以疊層,於電極底座之對應位置設置開口部,並供 給焊錫漿料,逆流後,將乾式薄膜予以剝離之方法(特開 2000 — 2089 1 1號公報)等,進行應付焊料凸點狹間距化的 檢討。 於上述之焊料凸點之形成步驟中,使用正型光阻物時 ,一般可輕易剝離,難以控制開口圖案的形狀,於焊料凸 點大小之均勻性上易發生問題。 相對地使用負型光阻物時’雖較容易控制圖案形狀, 但因係爲光交聯型,故一般爲剝離困難。特別於漿料埋入 後進行逆流形成焊料凸點時’經由逆流時的熱而進一步進 行負型光阻物的交聯反應’故更難將光阻物由基板上剝離 .-6 - (3) 1304315 光阻膜的剝離i般爲以使用氫氧化鈉或碳酸鈉水溶液 的噴霧剝離,但於使用乾式薄膜狀或液狀之負型光阻物時 ,乃使用在高極性溶劑中添加有機鹼之剝離液予以浸漬剝 離。前者之方法雖爲廉價,但於焊料凸點密集之部分易發 生剝離殘留物,有時易發生令焊料凸點惡化等問題,後者 之方法則具有剝離液本身爲昂貴,若爲了提升每一定剝離 液量的剝離處理枚數,而提高有機鹼濃度,並提高剝離液 之溫度,則令焊料凸點之金屬表面惡化,並且具有令頭道 基板表面腐蝕等之問題點。 【發明內容】 發明之揭示 本發明爲了解決上述問題點,乃如圖1 ( a )或圖5 ( a )般於電路基板上,形成下層爲由鹼可溶性且非感放射線 性樹脂組成物所構成,上層爲由負型感放射性樹脂組成物 所構成的雙層層合薄膜後,經由暫時的曝光/顯像操作, 則可於電極底座之對應位置形成焊料凸點形成用的開口圖 案。 又,本發明爲在使用特性不同的雙層層合薄膜下,令 高解像性和易剝離性可兩相成立。即,經由使用具有酚性 羥基之化合物做爲下層,則達成如下述之效果。 (1 )對下層賦與適當的鹼顯像性,並且以曝光/顯 像操作可暫時予以圖案化。 (2 )經由下層樹脂組成物所具有之酚性羥基令光自 (4) 1304315 由基失活之效果,即使於上下層之界面,及上下層進行內 部混合時,亦可抑制下層與基板界面的硬化反應,可保持 雙層層合薄膜的良好剝離性。 藉此,可使用直到目前剝離性低且難應用的負型光阻 物做爲上層。又,使用負型光阻物做爲上層,則可在圖1 (b )或圖5 ( b )所示之焊料凸點形成開口圖案內導入低 熔點金屬之步驟中,確保必要之光阻圖案的機械強度。 又,下層因爲剝離性優良,故即使以單獨之二甲基亞 硕或N -甲基吡咯烷酮等之高極性有機溶劑亦可剝離,並 且,進行交聯反應之上層部分的剝離片因爲於此些高極性 有機溶劑中爲難溶,故產生易經由沈降分離或循環過濾將 剝離片除去的優點。 又,於使用具有多段浸漬槽之剝離設備時,於第一槽 爲經由有機溶劑而完成大部分負型光阻膜的剝離,於第二 槽以後則經由含有驗性成分的剝離液,於選擇移除下層之 剝離殘留物之步驟下,則可不提高剝離液的鹼性濃度即可 提升剝離處理能力,並且可將焊料凸點及頭道基板的損傷 壓至最低限度。 【實施方式】 實施發明之最佳形態 以下,參照圖面說明本發明之焊料凸點的形成方法。 關於根據本發明之第一實施形態之電極底座上形成焊 料凸點之方法,爲使用圖2更加詳細說明。於本實施形態 (5) 1304315 中,電路基板爲由做爲基材的矽晶圓203、和其表面所設 置之多數電極底座2 0 1所構成,且於形成焊料凸點用之開 口部2 2 0內導入低熔點金屬之步驟係爲使用充塡代表焊錫 漿料之低熔點金屬漿料的方法。還有,於電極底座2 0 1之 兩側面及該底座之兩側端面上,形成鈍化膜2 02。 於半導體全面以區域狀配置電極底座2 〇丨之半導體晶 片晶圓的截面構造示於圖2 (a)。於砂晶圓203之表面上 形成電極底座2 0 1,且於電極底座2 0 1表面爲露出之狀態下 ,於電路基板表面,例如覆蓋1 // m的鈍化膜2 0 2。 如圖2 ( b )所示般,於電極底座201及鈍化膜202之全 部表面上,以賤鍍法、澱積法等形成電極金屬的防止金屬 擴散膜204。防止金屬擴散膜204爲使用Ni、Cr、TiN、 TaN、Ta、Nb、WN任一者,例如形成1 // m之膜厚。此 防止金屬擴散膜204可爲單層膜或層合膜。 如圖2 ( c )所示般,於形成防止金屬擴散膜204之電 路基板全體表面上,例如將Ti、Ni、Pd、Cii等之阻擋金屬 膜,使用濺鍍裝置、電子束澱積裝置等分別疊層散千A的 膜厚,形成阻擋金屬層205。 如圖2 ( d )所示般,於形成阻擋金屬層205之電路基 板的表面上,形成由鹼可溶性且非感放射性樹脂組成物所 構成之下層2 0 6,由負型感放射線性樹脂組成物所構成之 上層207的雙層層合薄膜。 例如將液狀下層材料以2〜3 // m之膜厚塗佈形成下 層206。更且,於下層206上,將液狀之負型光阻物或乾式 (6) 1304315 薄膜狀之負型光阻物任一者以5 0 // m以上之膜厚塗佈或 層合,形成上層2 0 7。對於下層2 0 6和上層2 0 7所構成的雙 層層合薄膜,透過光罩照射放射線後顯像,於電極底座 20 1上之形成焊料凸點用場所_之對應位置,形成焊料凸點 形成用之開口部2 2 0。 包含上述方法之雙層層合薄膜的形成方法有 ① 下層爲液狀,上層爲液狀光阻物
② 下層爲液狀,上層爲乾式薄膜光阻物 ③ 下層爲乾式薄膜,上層爲液狀光阻物 ④ 下層爲乾式薄膜,上層爲乾式薄膜光阻物 ⑤ 具有下層/上層二層構造之乾式薄膜 等之組合。 如圖2 ( e )所示般,於上述焊料凸點形成用之開口部 220使用滑移板209等,埋入例如焊錫漿料般的低熔點金屬 漿料2 0 8。
如圖2 ( f )及(g )所示般,將埋入金屬漿料之電路 基板於氮氣環境氣體中加熱,將金屬漿料逆流形成焊料凸 點 2 1 0 〇 如圖2 ( h )所示般,將層合膜剝離。其後,進行電性 試驗,並進行塑模,分割成晶片,進行倒裝片裝配。 本實施形態中,雖例示低熔點金屬漿料做爲焊錫漿料 ,但即使使用混合 Sn、Pb、Ag、Bi、Zn、In、Sb、Cu、
Bi、Ge等金屬之混合金屬,亦可取得良好的信賴性。還有 ,於形成低熔點金屬凸點,較佳爲焊料凸點時,除了使用 -10> (7) 1304315 滑移板埋入焊料凸點形成用之開口部22 0之方法以外,亦 可使用搭載祗熔點金屬球(焊料球)3 0 8之第二實施形態 (圖3 )、和以電鍍形成低熔點金屬膜4〇8之第三實施形態 (圖4 )予以形成。 又,將金屬漿料逆流後,進行鬆化洗淨。 圖5 ( a )〜(d )爲於所謂的多層印刷電路基板上, 根據本發明形成焊料凸點時的說明圖。此圖5之層間樹脂 絕緣層之下方爲分別形成各一層之導體電路和層間樹脂絕 緣層,而其通常形態爲交互形成多層。 關於本發明第四實施形態之電極底座上形成焊料凸點 之方法,爲使用圖6予以說明。於本實施形態中,電路基 板爲由玻璃環氧樹脂或BT (雙馬來醯亞胺-三哄)樹脂 6 1 5所構成之基材、和於其上所設置之層間樹脂絕緣層6 0 2 、和複數之電極底座605、和於電極底座60 5之側面所形成 之焊料光阻物6 1 1所構成,且於焊料凸點形成用之開口部 608內導入低熔點金屬61 1所構成,且於焊料凸點形成用之 開口部6 0 8內導入低熔點金屬之步驟,乃使用以滑移板充 塡代表焊錫漿料之低熔點金屬漿料6 1 0之方法。 於半導體全面以區域狀配置電極底座6 0 5之電路基板 的截面構造示於圖6 ( a )。於玻璃環氧樹脂6 1 5上具有層 間樹脂絕緣層602和導體電路6 03之多層層合板的電路基板 ,爲藉由鍍層形成的雙孔604,確保上下導通。於層間樹 脂絕緣層60 2上塗佈焊料光阻物61 1,且於底部於電極底座 之對應位置形成開口部。於此開口部之底部露出一部分的 -11 - (8) 1304315 導體電路6 0 3,於此導體電路6 0 3上以無電場鍍層等形成電 極底座6 0 5。 如圖6 ( b )所示般,於焊料光阻物6 1 1上,形成由鹼 可溶性且非感放射線性樹脂組成物所構成之下層606、由 負型感放射線性樹脂組成物所構成之上層607的雙層層合 薄膜。 例如將液狀下層材料以2〜3 // m之膜厚塗佈形成下 層6 0 6。更且,於下層6 0 6上,將液狀之負型光阻物或乾式 薄膜狀之負型光阻物任一者以40 // m以上之膜厚塗佈或 層合,形成上層607。其次將此層合薄膜予以圖案曝光後 ,顯像,則可於電極底座605上之形成焊料凸點用場所之 對應位置,形成焊料凸點形成用之開口部608。 包含上述方法之雙層層合薄膜的形成方法爲與矽晶圓 做爲基材之情況同樣地,可爲 ① 下層爲液狀,上層爲液狀光阻物 ② 下層爲液狀,上層爲乾式薄膜光阻物 ③ 下層爲乾式薄膜,上層爲液狀光阻物 ④ 下層爲乾式薄膜,上層爲乾式薄膜光阻物 ⑤ 具有下層/上層二層構造之乾式薄膜 等之組合。 如圖6 ( c )所示般,於上述焊料凸點形成用之開口部 60 8使用滑移板609等,埋入例如焊錫漿料般的低熔點金屬 漿料6 1 0。 其次,如圖6 ( d )及(e )所示般,將埋入金屬漿料 -12、 (9) 1304315 之電路基板於氮氣環境氣體中加熱,將金屬漿料逆流形成 焊料凸點。 ‘ 其後,如圖6 ( f)所示般,將層合膜剝離。 本實施形態中,雖例示低熔點金屬漿料做爲焊錫漿料 ,但即使使用混合 Sn、Pb、Ag、Bi、Zn、In、Sb、Cu、 B i、G e等金屬之混合金屬,亦可取得良好的信賴性。還有 ,於形成低熔點金屬凸點,較佳爲焊料凸點時,除了使用 滑移板埋入焊料凸點形成用之開口部60 8之方法以外,亦 可使用搭載低熔點金屬球(焊料球)7 0 8之第五實施形態 (圖7 )、和以電鍍形成低熔點金屬膜8 0 8之第六實施形態 (圖8 )予以形成。 又,將金屬漿料逆流後,進行鬆化洗淨。 以下,詳細說明本發明之下層材料和上層材料。 下層 本發明所用之下層,除了含有鹼可溶性化合物,較佳 爲具有酚性羥基之鹼可溶性化合物以外,並無特別限制, 但以如下組成爲佳。 還有,形成下層時,使用由鹼可溶性且非感放射線性 樹脂組成物所構成的下層材料,且下層材料可爲液狀或乾 式薄膜狀。 〔具有酚性羥基之鹼可溶性化合物:A成分〕 本發明所用之上述化合物(以下稱爲化合物(A )) -13 - (10) 1304315 大致可分成苯酚骨架爲1 0個以下的低分子量化合物、和酚 醛樹脂或聚(4 -羥基苯乙烯)等之高分子量聚合物。 於使用低分子量之化合物(A )之情形中,形成開口 部時所使用的顯像液以碳酸鈉等之鹼性較弱的顯像液爲佳 。又’於使用高分子量之聚合物之情形中,形成開口部時 所使用的顯像液以氫氧化四甲基銨等之鹼性較強的顯像液 爲佳。 低分子量化合物之例可列舉4,4,〔 1〔 4〔 1 一( 4 一 羥苯基)一 1 一甲基乙基〕苯基〕亞乙基〕二苯酚、2,2 —雙(1,5 —二甲基一 4一羥苯基)丙酸甲酯、4,6 —雙 〔1一(4 一羥苯基)一1 一甲基乙基〕一1,3 —苯二醇等 〇 又,此外熱聚合抑制劑亦可使用一般所用的化合物。 可列舉例如鄰苯二酚、苯醌、氫醌、甲基藍、第三丁基鄰 苯二酚、單苄醚、甲基氫醌、戊醌、戊氧基氫醌、正丁基 苯酚、苯酚、氫醌單丙醚、4,I 一 (1—甲基亞乙基) 雙(2—甲基苯酚)、4,一 (1 一甲基亞乙基)雙(2 ,6 —二甲基苯酚)、4,4,,4" 一亞乙基三(2—甲基 苯酚)、4,4,,4々一亞乙基三苯酚、1,1,3—(2,5 一二甲基一4一羥苯基)—3—苯基丙烷等。 高分子量化合物之例爲具有酚性羥基之聚合物,可列 舉下列所示之酚醛樹脂、聚羥苯乙烯及其衍生物。彼等可 單獨使用,亦可混合使用。 -14- (11) 1304315 (酚醛樹脂) 本發明所用之鹼可溶性酚醛樹脂爲令間-甲酚與其他 一種以上之酚類與醛化合物縮合所得之樹脂,若間-甲酚 之比例爲全酚類中之50〜90莫耳%之鹼可溶性酚醛樹脂即 可,並無特別限制。 酚醛樹脂之原料所使用之該其他酚類具體而言可列舉 例如2,3—二甲苯酚、2,4 —二甲苯酚、2,5 —二甲苯酚 、3,4一二甲苯酚、3,5 —二甲苯酚及2,3,5 —三甲基 苯酚等。彼等可單獨或組合使用二種以上。 其中,較佳可列舉2,3 —二甲苯酚、2,4 —二甲苯酚 、3,4一二甲苯酚及2,3,5—三甲基苯酚。 又,間-甲酚與其他一種以上酚類之較佳組合可列舉 間一甲酚/ 2,3 —二甲苯酚、間一甲酚/ 2,4 —二甲苯酚 、間一甲酚/ 2,3 —二甲苯酚/ 3,4 一二甲苯酚、間一甲 酚/ 2,3,5 —三甲基苯酚及間一甲酚/ 2,3 —二甲苯酚 /2,3,5—三甲基苯酚等。 又,被縮合之醛化合物可列舉例如甲醛、對甲醛、乙 醛、苯甲醛、鄰一羥基苯甲醛、間一羥基苯甲醛、對一羥 基苯甲醛、乙二醛、戊二醛、對酞醛、間酞醛等。其中, 特別以甲醛、鄰-羥基苯甲醛爲適於使用。 此些醛類可單獨或組合使用二種以上。此類醛化合物 相對於酚類1莫耳,較佳使用0.4〜2莫耳,更佳爲0.6〜15 吴耳之份量。 於酚類與醛化合物之縮合反應上,通常使用酸性觸媒 -15- (12) 1304315 。此酸性觸媒可列舉例如鹽酸、硝酸、硫酸、甲酸、草酸 、醋酸、甲烷磺酸、對-甲苯磺酸等。此類酸性觸媒通常 相對於酚類1莫耳,可使用1 X 1 0 — 5〜5 X 1 〇 - 1莫耳之份 量。 於縮合反應中,通常使用水做爲反應介質,由反應初 期變成不均勻系之情況可使用例如甲醇、乙醇、丙醇、丁 醇、丙二醇單甲醚等之醇類、四氫呋喃、二哼烷等之環狀 醚類、乙基甲基酮、甲基異丁基酮、2—庚酮等之酮類做 爲反應介質。此些反應介質通常爲反應原料每100重量份 ,使用20〜1,00 0重量份之份量。 縮合反應之溫度爲根據原料的反應性而適當調整,但 通常爲10〜200 °C。 反應方法爲適當採用將酚類、醛化合物、酸性觸媒等 一倂裝入之方法,及於酸性觸媒存在下將酚類、醛化合物 等隨著反應之進行而加入之方法等。 縮合反應終了後,爲了除去系統內存在的未反應原料 、酸性觸媒、反應介等,乃將反應溫度上升至130 °C〜230 °C,並於減壓下除去揮發成分,回收酚醛樹脂之方法,和 將所得之酚醛樹脂於乙二醇單甲醚醋酸酯、3 -甲氧基丙 酸甲酯、乳酸乙酯、甲基異丁基酮、2 —庚酮、二Df烷、 甲醇、醋酸乙酯等之良溶劑中溶解後,混合水、正己烷、 正庚烷等之貧溶劑,其次,將析出之樹脂溶液層予以分離 ,回收高分子量之酚醛樹脂之方法。 又,前述酚醛樹脂之換算成聚苯乙烯的重量平均分子 -16- (13) 1304315 量(以下,稱爲「Mw」),由製膜組成物時之作業性, 使用做爲光阻物時之顯像性、感度及耐熱性之觀點而言, 以2,000〜20,000爲佳,且以3,000〜15,000爲特佳。 (聚羥基苯乙烯) 本發明可使用之聚羥基苯乙烯類可列舉以 Marucalinker M Marucalinker CMM、Marucalinker CHM、 Marucalinker MB、Marucalinker PHM— C、Marucalinker CTS、Marucalinker CBA(九善石油化學(株)製)等名 稱販售的樹脂。 〔溶劑:B成分〕
將上述成分A溶解、塗佈之目的下可使用溶劑。溶劑 若爲可良好溶解化合物A者即可,並無特別限制。溶劑之 例可列舉乙二醇單甲醚、乙二醇單乙醚、乙二醇單甲醚醋 酸酯、乙二醇單乙醚醋酸酯、二甘醇單甲醚、二甘醇單乙 醚、丙二醇單甲醚、丙二醇單丙醇醋酸酯、甲苯、二甲苯 、甲基乙基酮、2 —庚酮、3 —庚酮、4 —庚酮、環己酮、2 一羥基丙酸乙酯、2 -羥基一 2 一甲基丙酸乙酯、乙氧基醋 酸乙酯、羥基醋酸乙酯、2 —經基一 3 —甲基丁酸甲酯、3 一甲氧基丙酸甲酯、3—乙氧基丙酸乙酯、3 一甲氧基丙酸 乙酯、醋酸丁酯、丙酮酸甲酯、丙酮酸乙酯等。更且,亦 可添加N —甲基甲醯胺、n,N—二甲基甲醯胺、N—甲基 甲醯替苯胺、N—甲基乙醯胺、n,N —二甲基乙醯胺、N …17- (14) 1304315 一甲基吡咯烷酮、二甲基亞硕、苄基乙醚、二苄醚、乙腈 丙酮、異佛爾'酮、乙酸、辛酸、1 一辛酸、1 一壬酸、苄醇 、醋酸苄酯、苯甲酸乙酯、草酸二乙酯、順丁烯二酸二乙 酯、r 一丁內酯、碳酸伸乙酯、碳酸丙酯、乙二醇單苯醚 醋酸酯等之高沸點溶劑。此些溶劑可單獨或組合使用二種 以上。其中以2 —羥基丙酸乙酯和丙二醇單甲醚醋酸酯爲 佳。 〔丙烯酸樹脂:C成分〕 特別於使用低分子量之具有酚性羥基之化合物做爲a 成分時,於提高塗佈性,令塗膜性狀安定之目的下,可添 加如下所示之鹼可溶性丙烯酸樹脂。 丙烯酸樹脂之組成並無特別限制,可爲(甲基)丙烯 酸酯所導出的單位,加上含有用以賦與鹼可溶性而具有笑至 基和/或酚性羥基之自由基聚合性化合物所導出的單位。 具有殘基之自由基聚合性化合物,可使用例如丙稀酸 、甲基丙烯酸等。 具有酚性羥基之自由基聚合性化合物可使用對一經基 苯乙烯、間一羥基苯乙烯、鄰一羥基苯乙燒、α —甲基— 對一羥基苯乙烯、α —甲基一間一羥基苯乙烯、α 一甲基 一鄰-羥基苯乙烯、4 一異丙烯基苯酚、2 一乙烯丙基苯酉分 、4 一烯丙基苯酚、2-烯丙基一 6-甲基苯酚、2-烯丙基 一 6 —甲氧基苯酚、4 一烯丙基一 2-甲氧基苯酚、4一烯两 基一 2,6—二甲氧基苯酚、4一烯丙氧基一 2一羥基二苯酮 -18- (15) 1304315 等之具有酚性羥基的乙·烯系單體等。此些化合物可單獨或 組合使用二種以上。其中以對一羥基苯乙烯、4 一異丙烯 基苯酌爲佳。 於此類丙烯酸共聚物中結合具有羧基之自由基聚合性 化合物和/或具有酚性羥基之自由基聚合性化合物所導出 的單位爲單獨或組合以1〜60重量%,較佳爲5〜50重量% 。若未滿5重量%,則丙烯酸共聚物於鹼性顯像液中難溶 解,故於顯像後產生膜殘留並且無法取得充分的解像度。 相反地,若超過5 0重量%,則丙烯酸共聚物對於鹼性顯像 液之溶解性變爲過大,於雙層化時易變成下切(undercut )形狀。 〔界面活性劑:D成分〕 於此組成物中,在提高塗佈性、消泡性、勻塗性之目 的下,亦可配合界面活性劑。界面活性劑可使用以B Μ -1 000、ΒΜ— 1100 ( BM CHEMY公司製)、MEGAFAC F 142D、同F 172、同F 173、同F 183 (大曰本油墨化學( 株)製)、FLORADE FC— 135、同 FC-170C、同 FC — 430、同 FC— 431 (住友 3Μ (株)製)、SARFURON S — 112、同 s— 113、同 S— 131、同 S— 141、同 S— 145 (旭硝 子(株)製)、SH— 289Α、同—190、同—193、SZ — 603 2、SF — 8 42 8 (東雷Silicone (株)製)等之名稱所販 售的氟系界面活性劑。此些界面活性劑之使用量相對於共 聚物(A ) 1 0 0重量份較佳以5重量份以下。 -19- (16) 1304315 於本發明所用之下層材料中,可含有其他成分。具體 而言’可列舉苯酚酚醛型環氧樹脂、甲酚酚醛型環氧樹脂 、雙酚型環氧樹脂、三酚型環氧樹脂、四酚型環氧樹脂、 苯酚一伸二甲苯型環氧樹脂、苯酚-伸二甲苯型環氧樹脂 、苯酚-萘酚型環氧樹脂、苯酚一二環戊二烯型環氧樹脂 、月曰式氧樹脂等。又’亦可添加無機充塡劑,具體而 言可列舉矽石、氫氧化鋁、硫酸鋇等。更且,亦可含有高 分子添加劑、反應性稀釋劑、勻塗劑、濕潤性改良劑、可 塑劑、抗氧化劑、抗靜電劑、防黴劑、調濕劑、難燃劑等 上層 形成上層時,使用由負型感放射線性樹脂組成物所構 成的上層材料,且上層材料可爲液狀或乾式薄膜狀。 此類負型感放射線性樹脂組成物可使用例如特開平 8 - 3 0 1 9 1 1號公報所記載之感放射性樹脂組成物。 本發明所用之負型感放射線性樹脂組成物爲由丙_酸 樹脂(上述C成分)、交聯劑(E成分)、引發劑(F成 分)、溶劑(上述B成分)、界面活性劑(上述D成分) 等所構成。 〔交聯劑:E成分〕 交聯劑(E )可列舉例如三羥甲基丙烷三(甲基)西 烯酸酯 '季戊四醇三(甲基)丙烯酸酯、乙二醇二(甲基 , -20 - (17) 1304315 )丙烯酸酯 '四甘醇二(甲基)丙烯酸酯、聚乙二醇二( 甲基)丙烯酸酯、1,4 - 丁二醇二(甲基)丙烯酸酯、丁 二醇二(甲基)丙烯酸酯、丙二醇二(甲基)丙烯酸酯、 三羥甲基丙烷二(甲基)丙烯酸酯、丨,6 一己二醇二(甲 基)丙烯酸酯、新戊二醇二(甲基)丙烯酸酯、三羥甲基 丙i:兀二(甲基)丙烯酸酯、三(2 一羥乙基)異氰脲酸酯 三(甲基)丙烯酸酯、三(2 —羥乙基)異氰脲酸酯二( 甲基)丙烯酸酯、三環癸烷二甲醇二(甲基)丙烯酸酯、 雙ffij A之一縮水甘油醚中加成(甲基)丙燒酸的環氧(甲 基)丙烯酸酯、雙酚A二(甲基)丙烯醯氧基乙醚、雙酚 A二(甲基)丙烯醯氧乙氧基乙醚、雙酚a二(甲基)丙 烯醯氧基氧甲基乙醚、四羥甲基丙烷四(甲基)丙烯酸酯 、季戊四醇三(甲基)丙烯酸酯 '季戊四醇四(甲基)丙 烯酸酯、二季戊四醇五(甲基)丙烯酸酯、二季戊四醇六 (甲基)丙烯酸酯等。
此些交聯劑(E成分)可直接使用市售之化合物。市 售化合物之具例可列舉ARONIX M— 210、同M— 309、同 Μ — 310、同 Μ — 400、同 Μ — 7100、同 Μ — 80 30、同 Μ — 8060、同 Μ— 8100、同 Μ— 9050、同 Μ— 240、同 Μ— 245、 同 Μ— 6100、同 Μ— 6200、同 Μ— 6250、同 Μ— 63 00、同 Μ— 6400、同M— 6500 (以上,東亞合成(株)製、 KAYARAD、R — 551、同 R— 712、同 TMPTA、同 HDDA、 同 TPGDA、同 PEG400DA、同 MANDA、同 HX— 200、同 HX — 620、同 R— 640、同 DPCA — 20、同 DPCA— 30、同 DPCA -21 - (18) 1304315 —60、同DPCA — 120 (以上,臼本化藥(株)製)、 BISCOAT #295、同 3 00、’同 26 0、同 312、' 同 3 5 5 HP、同 3 6 0、同GPT、同3PA、同400 (以上,大阪有機化學工業 (株)製)等。 此些交聯劑(E成分)可單獨或倂用二種以上,相對 於丙烯酸樹脂(分成分)1 〇 〇重量份較佳以丨〇〜2 5 〇重量份 ,更佳爲20〜200重量份,特佳爲25〜15〇重量%。若未滿 1 〇重量份,則曝光時之感度易降低,若超過2 5 〇重量份則 與共聚物(A )之相溶性變差,保存安定性降低,且有時 難形成2 0 // m以上的厚膜。 〔放射線自由基聚合引發劑:F成分〕 放射線自由基聚合引發劑(以下,稱爲引發劑:F成 分)可列舉例如苄基、二乙醯基等之α 一二酮類;苯偶姻 等之偶姻類;苯偶姻甲醚、苯偶姻乙醇、苯偶姻丙醇等之 偶姻醚類;噻吨酮、2,4 一二乙基噻吨酮、噻吨酮一 4 — 5風酸、二苯酮、4,I 一雙(二甲胺基)二苯酮、4,4, 〜雙(二乙胺基)二苯酮等之二苯酮類;乙醯苯、對一二 甲胺基乙醯苯、α ,α —二甲氧基一 α —乙醯氧基二苯酮 、α ,α —二甲氧基一 α 一苯基乙醯苯、對一甲氧基乙醯 苯、1一 〔2—甲基一 4 一甲硫苯基〕一 2—嗎啉基一 1 一丙 酮、α ,α —二甲氧基—α 一嗎啉基一甲硫苯基乙醯苯、 2 —卡基—2 — 一甲胺基一 1 一 (4一嗎琳苯基)一丁院一 1 一酮等之乙醯苯類;蒽醌、1,4 -萘醌等之醌類;苯醯甲 - 22- (19) 1304315 基氯、三溴甲基苯基硕、三(三氯甲基)- S-三畊等之 鹵素化合物;—雙咪唑〕—3,3/,4,,4^一 四苯基、〔1,2,—雙咪唑〕一 1,-二氯苯基—3,3 > ,4> ,4 / 一四苯基等之雙咪唑類、二一第三丁基過氧 化物等之過氧化物;2,4,6 -三甲基苯偶姻二苯膦氧化 物等之醯膦氧化物類等,又,市售品可列舉IRGACURE 184、 651、 500、 907 、 CGI 1369、 CS 24—61 (以上, Ciba Specialty Chemicals (股)製)、RUSILIN、LR 8 72 8 、 RUSILIN ΤΡΟ (以上,BASF (株)製、 DAR0CURE 1116 、 1173 (以上,Ciba Specialty
Chemicals (股)製)、U B E C RILIR P 3 6 ( U C B (股)製) 等。又,視需要亦可將氫硫基苯並噻唑、氫硫基苯並鸣唑 等之具有氫供給性的化合物與上述光自由基聚合引發劑倂 用。 上述各種放射線自由基聚合引發劑中較佳之化合物可 列舉1 一 〔 2 —甲基一 4 —甲硫苯基〕一 2 —嗎啉基一1 一丙 酮、2_节基一2—二甲胺基—1— (4一嗎啉苯基)一丁院 —1—酮、α ,α —二甲氧基一 α —苯基乙酿苯等之乙醯 苯類、苯甲醯基氯、三溴甲基苯基硕、2,4,6—三甲基 苯偶姻二苯膦氧化物、1,2 / -雙咪唑類與4,4 / 一二乙 胺基二苯酮與氫硫基苯並噻唑倂用,RUSILIN ΤΡ0、 IRGACURE 651等。此些化合物可單獨或組合使用二種以 上。其使用量爲相對於鹼可溶性共聚物(A ) 1 0 0重量份 ,較佳以〇 · 1〜6 0重量份,更佳爲5〜5 0重量份,特佳爲} 〇 -23 - (20) 1304315 〜40重量份。其使用量若爲1重量%以下,則自由基易受 到氧氣的影響而失活(感度降低),又,若超過60重量% ’則相溶性變差,且保存安定性有降低之傾向。又,此些 放射線自由聚合引發劑與放射線增感劑倂用亦可。 下層及上層之形成方法 本發明爲於具有指定電路圖案之基板上,首先將下層 塗佈或層合,其次將上層塗佈或層合後,形成所欲的雙層 層合薄腠。於基板上之形成方法’於材料爲液狀時,可採 用浸漬法、旋塗法、輥塗法、網版印刷法、塗佈輥祛、幕 塗法等之方法。又,於材料爲薄膜狀時,可採用層合法、 真空層合法等之方法。還有,下層及上層之乾燥條件爲依 據組成物中之各成分的種類、配合比例、塗佈膜厚等而異 ,但通常爲於70〜12(TC下以5〜20分鐘左右,較佳爲8〇〜 1 0 0 C。乾燥日寸間若過短,則顯像時之密黏狀態變差,又 ,若過長,則因過熱導致解像度降低。 又’作成以下層材料與上層材料爲首之雙層構造的乾 式薄膜’並且暫時層合,則可於基板上形成雙層層合薄膜 〇 放射線照射方法 對所得之層合薄膜透過指定圖案的光罩,照射波長爲 3 0 0〜5 OOnm的紫外線或可見光線。此些放射線之光源可 使用低壓水銀燈、高壓水銀燈、超高壓水銀燈、金屬鹵素 燈、氳氣雷射等。此處所謂之放射線爲意指紫外線、可見 -24- (21) 1304315 光線、遠紫外線、X射線、電子射線等。放射線照射量爲 依據組成物中之各成分的種類、配合量、層合薄膜之膜厚 等而異’例如於使用超高壓水銀燈時,爲1〇〇〜5〇〇mJ/ cm2 ° 顯像方法 方夕Ιί線照射後之顯像方法爲使用鹼性水溶液做爲顯像 液’並將不要的部分予以溶解、除去,僅殘存放射線照射 方法。顯像液可使用例如氫氧化鈉、氫氧化鉀、碳酸鈉、 矽酸鈉、偏矽酸鈉、氨水、乙胺、正丙胺、二乙胺、二正 丙胺、三乙胺、甲基二乙胺、二乙基乙醇胺、二乙醇胺、 氫氧化四甲基銨、氫氧化四乙基銨、吡咯、哌啶、1,8 一 二卩丫雙環〔5 · 4 · 0〕一 7 —十一碳烯、1,5 -二吖雙環〔 4.3 · 0〕一 5 —壬烷等之鹼類水溶液。又,於上述鹼類水溶 液中適量添加甲醇、乙醇等之水溶性有機溶劑和界面活性 劑之水溶液亦可使用做爲顯像液。顯像時間爲依據組成物 各成分之種類、配合比例、組成物之乾燥膜厚而異,通常 爲3 0〜3 6 0秒鐘。顯像方法可爲滿液法、漬浸法' 槳葉法 、噴霧顯像法等任一種。顯像後,以流水洗淨3 〇〜9 0秒鐘 ,使用空氣槍等令其風乾,並於烘爐中乾燥。 若使用如上述之顯像液進行顯像,則上層爲僅殘存放 射線照射部分,下層爲僅將對應上層中被除去部分(放射 非照射部)之部分予以溶解除去。 其後對殘存的光阻膜,經由後曝光和加熱再令光阻膜 -25- (22) 1304315 硬化亦可。 焊料凸點之形成 其次對如上述的開口圖案,例如導入焊 熔點金屬,並且加熱逆流形成焊料凸點。又 導入低熔點金屬之其他方法例如爲直接搭載 、或電鍍等。 剝離處理 於形成焊料凸點後,將基板上殘存之硬 的方法爲將該基板於5 0〜8 0 °C中攪拌之剝离1 3 0分鐘,則可將硬化膜(光阻膜)剝離。此 離液以使用單獨之二甲基亞碾或四級銨鹽與 水的混合溶液爲佳。 更具體而言,由基板上將雙層層合薄膜 去上,爲準備具有多段浸漬槽的剝離設備, 適當的有機溶劑將雙層層合薄膜剝離並且將 灑後’於弟一槽以後爲以含有有機鹼成分之 該層合薄膜的剝離殘留物予以剝離。 更且’準備具有多段浸漬槽之剝離設備 用二甲基亞碾將雙層層合薄膜剝離並且將剝 後’於弟一槽以後爲以含有有機驗成分和二 離液將該層合薄膜的剝離殘留物予以剝離爲 錫漿料等之低 ,對開口圖案 焊料球之方法 化物予以剝離 ^液中浸漬5〜 時所使用之剝 二甲基亞碾與 予以剝離、除 於第一槽使用 剝離片循環過 剝離液即可將 ,於第一槽使 離片循環過濾、 甲基亞碾之剝 佳0 -26- (23) 1304315 實施例 以下,根據實施例具體說明本發明,但本發明並非限 定於此。又,只要無特別指明,則份爲表示重量份、%爲 表示重量%。 以下列述下層材料與上層材料的原料。 (A成分:具有酚性羥基之化合物) A — 1 :將間〜甲酚與對—甲酚以重量比4〇 : 6〇之比 例混合’於其中加入甲醛水,使用草酸觸媒依常法縮合取 得甲酚酚醛。對於此樹脂施以分級處理,將低分子區域切 割取得重量平均分子量1 2 0 0 0的酚醛樹脂。 A— 2:4,4〆〔1— 〔4— ( 1 - (4 一 羥苯基)一1 — 甲基乙基〕苯基〕亞乙基〕二苯酚 (B成分:溶劑) B — 1 :丙二醇單甲醇 B — 2 : 2 —羥基丙酸乙酯 B — 3 : 2 —庚酮 (C成分:丙烯酸樹脂) C 一 1 :將附有乾冰/甲醇迴流器和溫度計之燒瓶以氮 氣進行更換後,裝入做爲聚合引發劑的2,2 / -偶氮雙異 丁腈4.0克,做爲溶劑的2 -羥基丙酸乙酯]2 0克,並且攬 拌直到聚合引發劑溶解爲止。接著,裝入丙烯酸2 0 · 0克、 -27- (24) 1304315 對一異丙烯基苯酚1 0.0克、甲基丙烯酸正-丁酯3 0 · 0克、 甲基丙烯酸甲酯2 0 · 0克、丙烯酸正丁酯2 0.0克後,慢慢開 始攪拌。其後,令溶液溫度上升至8 0 °C,以此溫度聚合4 小時,再升溫至1 〇(TC並以此溫度進行1小時聚合。其後, 於冷至室溫,將燒瓶內以空氣進行更換。將反應產物滴入 大量的甲醇中令反應物凝固。將此凝固物水洗後,於凝固 物同重量之四氫呋喃中再溶解,並以大量的甲醇令其再度 凝固。將此再溶解-凝固操作共計進行3回後,所得之凝 固物於4 0 °C下真空乾燥4 8小時,取得丙烯酸樹脂c — 1。 C - 2 :將附有乾冰/甲醇迴流器和溫度計之燒瓶以氮 氣進行更換後,裝入做爲聚合引發劑的2 ’ 2 / —偶氮雙異 丁腈4 · 0克,做爲溶劑的2 —羥基丙酸乙酯1 0 0克,並且攪 拌直到聚合引發劑溶解爲止。接著,裝入甲基丙烯酸1 0.0 克、對一異丙烯基苯酚15.0克、8 —三環〔5·2·1·0·02·6〕 癸基-甲基丙烯酸酯25.0克、丙烯酸異次片酯20克、丙儲 酸正丁酯3 0.0克後,慢慢開始攪拌。其次,令溶液溫度上 升至8 0 °C,以此溫度聚合3小時,添加2,2 / 一偶氮雙異 丁腈1克,並再以8 (TC聚合3小時,其後,升溫至1 0 0 °C並 以此溫度進行1小時聚合。放冷至室溫,將燒瓶內以空氣 進行更換。將反應產物滴入大量的甲醇中令反應物凝固。 將此凝固物水洗後,於凝固物同重量之四氫13夫喃中再溶解 ,並以大量的甲醇令其再度凝固。將此再溶解一凝固操作 共計進行3回後,所得之凝固物於4 0 T:下真空乾燥4 8小時 ,取得丙烯酸樹脂C 一 2。 * - 28 - (25) 1304315 C - 3 :將附有乾冰/甲醇迴流器和溫度計之燒瓶以氮 氣進行更換後,裝入做爲聚合引發劑的2,2 / -偶氮雙異 丁腈3.0克,做爲溶劑的2 一羥基丙酸乙酯1 5 0克,並且攪 持直到聚合引發劑溶解爲止。接著,裝入4 -異丙烯基苯 酉分4 3克、丙烯酸正丁酯3 〇 . 8克、丙烯酸2.9克、丙烯酸2 -經乙酯23 ·3克後,慢慢開始攪拌。其後,令溶液溫度上升 至7 〇 °C ’並以此溫度進行3小時聚合。其次添加做爲聚合 引發劑的2,2 / -偶氮雙異丁腈1 · 5克,再以7 0 °C繼續聚 合3小時。其後,放冷至室溫,將燒瓶內以空氣進行更換 後,加入對一甲氧基苯酌1 5 0毫克。將反應產物滴入大量 的甲醇中令反應物凝固。將此凝固物水洗後,於凝固物同 重量之四氫呋喃中再溶解,並以大量的甲醇令其再度凝固 。將此再溶解一凝固操作共計進行3回後,所得之凝固物 於4 0 °C下真空乾燥4 8小時,取得丙烯酸樹脂C — 3。 (D成分:界面活性劑) D - 1 ·· NBX — 15 (Neos公司製) D - 2: SF— 8428 (東雷 Silicone (股)製) (E成分:交聯劑) E—l: AR0NIXM - 8060 (東亞合成(股)) (F成分:引發劑) F — 1 : IRGACURE 651 ( Ciba Geigy公司製) -29- (26) 1304315 F — 2 : CACURE DETX — S (日本化藥(股))、 下層材料A— L、B—L、C—L之調製 如表1所示般,將A — 1以35份、!以65份、D — 1以 〇·1份攪拌、溶解後,使用孔徑3从m的膜濾器( ADVANTE(公司製 Capsuie cartridge Filter CCP—FX — CIB)予以過濾。調製下層材料A— L。同樣處理,調製下 層材料B— L、C— L。 下層材料B—D、C—D之製作 使用下層材料B - L或C 一 L製作乾式薄膜。對厚度50 // m ' 1 1公分正方的聚對酞酸乙二酯(ρΕτ )薄膜,使用 旋塗器將下層材料B - L,以烘烤後之膜厚爲5 // m般進行 塗佈後’以對流式烘爐於1 1 0 T:中烘烤1 0分鐘,製作下層 材料B - D。同樣處理,製作下層材料c 一 〇。
-30- 1304315 (27) 表1 ^^ 樣品$ A成分 B成分 C成分 D成分 形態 下層材料 A-1 B-1 — D-1 液狀 A‘L —___ 3 5份 65份 0.1份 、--- 下層材料 A-2 D-2 C-1 一 液狀 B^L 2 0份 90份 10份 --- 下層材料 A-2 B-2 C-1 一 乾式薄膜 20份 90份 10份 一----- 下層材料 A-2 B-2 C-3 D- 1 液狀 C-L 20份 9 0份 20份 〇·ΐ份 下層材料 A-2 B-2 C-3 D- 1 乾式薄膜 C-D 2 0份 9 0份 20份 0.1份 上層材料A—L、B - L、C—L之調製 使用表2所示之成分以下層材料A - L同樣之手續調製 上層材料A— D、B— D之製作 使用上層材料A - L或B - L製作乾式薄膜。對厚度5 0 // m ' 1 1公分正方的聚對酞酸乙二酯(PET )薄膜,使用 旋塗器將上層材料A - L,以烘烤後之膜厚爲40 // m般進 行塗佈後,以對流式烘爐於1 1 0 °C中烘烤1 〇分鐘,製作上 層材料A — D。同樣處理,製作上層材料B - D。 -31 - 1304315 (28) 表2 樣品名 B 成 分 C成分 D成分 E成分 F成分 形態 上層材料 B -1 C-2 D-1 E-1 F -1 1 8 · 6 份 液狀 A-L 8 8份 1〇〇份 0.1份 51.7 份 F-2 4.0份 上層材料 B-1 C-2 D-1 E-1 F -1 1 8 · 6 份 液狀 A - D 88份 1 0 0份 0.1份 51.7 份 F - 2 4 · 0 份 上層材料 B-2 C-1 D-2 E-1 F-1 乾式薄 B-L 122份 1 0 0份 0.3份 45份 30份 膜 上層材料 B-2 C-1 D-2 E-1 F-1 乾式薄 B-D 122份 1.00 份 〇·3份 45份 3〇份 膜 上層材料 B-3 C-2 D-1 E-1 F-1 18.6份 液狀 C-L 88份 1 00份 0.1份 51.7 份 F-2 4.0份 雙層乾式薄膜A、B之製作 以表3之組合製作雙層乾式薄膜。對厚度5 〇 # m、 1 1公分正方的聚對酞酸乙二酯(PET )薄膜,使用旋塗器 將上層材料B 一 L,以烘烤後之膜厚爲4 〇 μ 1Ώ般進行塗佈 後’以對流式烘爐於丨丨〇它中烘烤丨〇分鐘,其次對此塗佈 基板上使用旋塗器將下層材料B 一 L,以烘烤後之膜厚爲 40 “ m般進行塗佈後,以對流式烘爐於1 1 〇°C中烘烤10 分鐘,製作雙層乾式薄膜A。同樣處理製作雙層乾式薄膜 B。 -32- (29) 1304315
樣品名 '—------ 上層材料 下層林 雙層乾式薄膜 上層材料FUT. —__料 下層材粗D τ 雙層乾式薄膜 上層材料C-L —---L 下層材料r L 剝離液之調製 剝離液:於二甲基亞硕4 9 〇 〇克中添加氫氧化四甲基錢 水溶液(2 5重量% ) 1 0 0克後,攪拌,作成剝離液1。 評價基板A之製作 於4吋矽晶圓上以濺鍍形成〗〇 〇 〇 A鉻層,再於其上形 成銅層1 0 0 0人,作成評價基板A。 評價基板B之製作 對表面粗化之貼銅玻璃環氧層合板(基板厚:〇. 6 、大小;1 〇公分正方),塗佈(i )間—甲酚/對—甲醇 = 6 0 / 40 (莫耳比)所構成的甲酚酚醛樹脂(換算成聚苯 乙烯之重量平均分子量8 7 00) 、 (ii)六甲氧基甲基蜜胺 、(iii )交聯微粒子、(iv )苯乙烯基—雙(三氯甲基) 一 S —三畊及(v )含有乳酸乙酯做爲溶劑的焊料光阻物( JSR (股)製)、特願2000 — 3 3 4 3 4 8號中記載之實施例1的 感光性絕緣樹脂組成物),並以對流式烘爐於9(TC,加熱 1小時,製作3 0 // m厚的均勻塗膜。其後,使用校準器( Suss Microtech公司製MA — 15 0),透過圖案光罩,將來 -33- (30) 1304315 自高壓水銀燈之紫外線以波長3 5 0 li m中之曝光量爲3 0 0〜 5 00 nU/cm 2般進行曝光,並以對流式烘爐於90 °C,進行 1 5分鐘PEB (烘烤後曝光),且使用1重量%氫氧化鈉水 溶液以30°C淋洗顯像(壓力;3 kgf · cm2 ) 2〜3分鐘。其 後,使用高壓水銀燈以波長3 5 0 nm中之曝光量爲1〇〇〇 mJ / cm2般進行曝光。其次,以對流式烘爐於150°C,加熱2 小時,再於1 7 〇 °C加熱2小時取得硬化膜。 此基板爲於第一開口圖案中混合存在下列圖案。 • 1 5 0 // m間距且開口徑9 5 // m的孔圖案 • 1 2 5 // m間距且開口徑8 0 // m的孔圖案 • 1 0 0 // m間距且開口徑6 0 // m的孔圖案 對上述基板之開口部以Ni/ Αιι施行無電電鍍,作成 評價基板B。 旋塗法 將液狀之下層材料或上層材料對上述評價用基板直接 滴下,並使用旋塗器以烘烤後之膜厚爲40 // m般進行塗佈 後,以對流式烘爐於1 1 (TC烘烤1 0分鐘。將此塗佈基板慢 慢放冷至室溫度,將塗佈面以厚度50 // m之PET薄膜,使 用層合器予以覆蓋。 層合條件爲如下。 輥溫度:8 0 t 輥壓·· 0.4MPa 搬送速度·· 〇 . 5 m / m i η -34- (31) j304315 層合法 將乾式薄膜狀之下層材料、上層材料、或雙層乾式薄 膜使用層合器予以層合。使用做爲支撑體的PET薄膜爲就 其原樣之狀態。 層合條件爲如下。 輥溫度:120°C 車毘壓:0 · 4 Μ P a 搬送速度:〇.5m/ min
〔實施例1〕 <塗佈> 對評價基板A旋塗下層材料A - L,並以熱板於1 2 〇。〇 下烘烤5分鐘,形成膜厚5 // m的下層。於此下層之上方旋 塗上層材料A — L,並以熱板於1 2 0 °C下烘烤5分鐘,形成 膜厚6 5 // m的上層。
<曝光> 使用校準器(Suss Microtec公司製MA— 150),透過 附有圖案的玻璃光罩令來自高壓水銀燈之紫外線以波長 420 nm中之曝光量爲1〇〇〇 mj/ cm2般進行曝光。玻璃光 罩爲密合至以PET薄膜覆蓋的基板並且曝光。 <顯像> 經曝光之基板,以含有2.3 8 %氫氧化四甲基錢之水溶 -35- (32) 1304315 液(以下,簡稱爲TMAH顯像液)進行槳葉顯像 之滿液時間爲以90秒鐘爲中心並以1 5秒鐘間隔進 顯像後,以離子交換水漂洗60秒鐘。 此圖案化基板爲存在許多具有7 5 // m X 7 5 // 孔圖案。 顯像後,以光學顯微鏡和掃描型電子顯微鏡 ’並以下列基準評價。結果示於表4。 圖案形狀〇:具有7 5 // m X 7 5 // m開口之孔 無顯像殘留的地顯像,且未察見圖案浮起、剝落 像時間。 圖案形狀X :具有7 5 // m X 7 5 // m開口之孔 像殘留物、或者察見圖案浮起、剝落,且顯像時 <焊料凸點之埋入> 其後,對雙層層合薄膜之全體表面,使用滑 錫漿料塗佈,且於凹狀之焊料凸點形成用之開口 充塡焊錫漿料。還有,此處充塡的焊錫漿料爲 Ag以重量比96.5 : 3.5配合爲主之粒徑5〜20# m 且其黏度被調整至200Pa · S。其次,將焊料凸點 開0部所充塡之焊錫漿料以外之焊錫漿料,首先 板予以除去,其後,使用淸潔紙(cleaning paf 完全除去,令焊錫漿料的表面平坦化。 。顯像時 行調製。 m開口的 確認圖案 圖案爲以 寺具有顯 圖案有顯 間無界限 移板將焊 部中完全 含有Sn、 的焊料, 形成用之 使用滑移 ,e r )將其 -36- (33) 1304315 <逆流> 其後,將上述步驟所印刷之焊錫漿料以2 5 0 °C逆流 再進洗鬆化洗淨。 <剝離〉
於約1公升二甲基亞硕或剝離液1加溫至約6 〇。(:之剝離 槽中’逆流後’冷卻至室溫的基板以1 0分鐘浸瀆/攪拌下 ,將雙層層合薄膜剝離。 以剝離槽進行剝離處理之基板爲以異丙醇予以漂洗後 ,水洗並以空氣槍乾燥。 剝離處理後,以光學顯微鏡和掃描型電子顯微鏡觀察 基板表面、焊料凸點,並以下列基準進行評價。結果示於 表4。 評價基準 對於D M S Ο之剝離性〇:大部分之雙層層合薄膜爲剝 離。 對於DMSO之剝離性X :完全未剝離。 對於剝離液1之剝離性〇:於基板面上無剝離殘留物 〇 對於剝離液1之剝離性X :於基板面上觀察到剝離殘 留物。 〔實施例2〕 -37- (34) 1304315 <塗佈> 對評價基板A旋塗下層材料a - L,並以熱板於1 2 0 ΐ: 下烘烤5分鐘,形成膜厚5 // m的下層。於此下層之上方將 上層材料A — D (膜厚6 5 // m )層合。 以下之操作,以實施例1同樣之手續實施。 〔實施例3〕 對評價基板B旋塗下層材料B - L,並以乾淨爐於1 1 0 °C下烘烤1 〇分鐘,形成膜厚2 // m的下層。於此下層之上 方旋塗上層材料B — L,並於1 1 〇 °C下烘烤1 0分鐘,形成膜 厚4 0 // m的上層。 使用校準器(Suss Microtec公司製MA — 150),透過 附有圖案的玻璃光罩令來自高壓水銀燈之紫外線以波長 3 5 0 ηηι中之曝光量爲400 mJ/ cm2般進行曝光。玻璃光罩 爲密合至以PET薄膜覆蓋的基板並且曝光。 曝光時,於評價基板之孔圖案(第一開口圖案)上令 感放射線性樹脂組成物之第二開口圖案爲以相同位置般, 對準並且曝光。 經曝光之基板,使用1重量%碳酸鈉水溶液於3 0 °C下 以4 5秒鐘爲中心並以1 5秒鐘間隔進行淋洗顯像(壓力, 1 k g f · cm2 ) ° 此基板爲具有如下之第一開口圖案和第二開口圖案。 第一開口圖案 第二開口圖案 1 5 0 // m間距開口直徑9 5 Μ ni之孔開口直徑1 0 0 // m之 -38- (35) 1304315 孔 125 /i m間距開口直徑8〇 g m之孔開口直徑90 之孔 1 0 0 " m間距開口直徑6 0 // m之孔開口直徑8 〇 # m之孔 顯像後,以光學顯微鏡和掃描型電子顯微鏡確認圖案 形狀,並以下列基準進行評價。結果示於表4。 續像性〇:第二開口圖案爲以無顯像殘留物地顯像, 且未察見圖案浮起,剝落等並具有顯像時間。 顯像性X :於第二開口圖案有顯像殘留物,或者察見 圖案浮起、剝落,且顯像時間無界限。 以下之步驟爲與實施例1相同。 〔實施例4〕 <塗佈> 對δ平價基板B旋塗下層材料b - L,並以熱板於1 2 0 °C 下供烤5分鐘’形成膜厚2 # m的下層。於此下層之上方將 上層材料B— D (膜厚4〇//m)層合。 以下之操作爲以實施例3同樣之手續實施。 〔實施例5〕 對評價基板β旋塗下層材料B 一 L,並以乾淨爐於1 1 0 °C Τ供;烤1 0分鐘’形成膜厚2 // m的下層。於此下層之上 方旋塗上層材料A〜L,並以乾淨爐於1 1 〇。(:下烘烤1 0分鐘 ’开夕成膜厚4 0 // in的上層。 …39 - (36)1304315 以下之操作除了顯像,爲以實施例4同樣之手 續實施 <顯像> 經曝光之基板,以含有1 %氫氧化鈉之水溶液 ,簡稱爲N aO Η顯像液)於3 0 °C下以4 5秒鐘爲中心 秒鐘間隔進行淋洗顯像(壓力;1 kg f · cm 2 )。顯 以離子交換水漂洗6 0秒鐘。 (以下 並以15 ί象後, 〔實施例6〕 對評價基板B旋塗下層材料b - L,並以熱板方 下烘烤5分鐘’形成膜厚2 // πι的下層。於此下層之 上層材料B— D (膜厚40// m)層合。 以下之操作爲以實施例5同樣之手續實施。 ^ 1 2 0 °C 上方將 〔實施例7〕 對評價基板B層合下層材料β 一 D,形成膜厚2 下層。於此下層之上方旋塗上層材料B — l,並以 於下烘烤1〇分鐘,形成膜厚4〇v m的上層。 以下之操作爲以實施例3同樣之手續實施。 // m的 乾淨爐 〔實施例8〕 對評價基板B層合下層材料B〜〇 下層 。於此下層之上方層合上
層材料B 形成膜厚2 一 D (膜厚 // m的 4 0// m (37) 1304315 以下之操作爲以實施例3同樣之手續實施。 〔實施例9〕 對評價基板B層合雙層乾式薄膜A。 以下之操作爲以實施例3同樣之手續實施。
〔實施例1 〇〕 對評價基板B層合雙層乾式薄膜B。 以下之操作爲以實施例5同樣之手續實施。 〔比較例1〜4〕 比較例1〜4除了未形成下層材料以外,全部與對應編 號之實施例同樣實施。
-41 - (38)1304315 表4
實施例 膜 B Na2C03 〇 〇 實施例 10 雙乾式薄膜
B
NaOH 〇 〇 〇 比較例
A— L
A TMAH 〇 x x 比較例2
A - D
A TMAH 〇 x 比較例 B ~~ L b Na2C03 〇 比較例4 B - D B Na2C03 〇
X 【圖式簡單說明】 圖1爲示出本發明之焊料凸點之形成方法的截面模型 圖。 圖2爲示出本發明之焊料凸點之形成方法的截面模型 -42 - (39) 1304315 圖 圖 圖 圖 圖 圖 圖
圖3爲示出本發明之焊料凸點之形成方法的截面模型 圖4爲示出本發明之焊料凸點之形成方法的截面模型 圖5爲示出本發明之焊料凸點之形成方法的截面模型 圖6爲示出本發明之焊料凸點之形成方法的截面模型 圖7爲示出本發明之焊料凸點之形成方法的截面模型 圖8爲示出本發明之焊料凸點之形成方法的截面模型
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Claims (1)

  1. (1) 1304315 拾、申請專利範圍 1. 一種電極底座上形成焊料凸點之方法,其特徵爲於 基材、與複數電極底座所構成的電路基板上,至少進行下 述(a )〜(d )之步驟; (a )於電路基板上,形成下層爲由鹼可溶性且非感 放射線性樹脂組成物所構成,上層爲由負型感放射性樹脂 組成物所構成的雙層層合薄膜後,於電極底座的對應位置 形成開口圖案之步驟、 (b )於該開口圖案內導入低熔點金屬之步驟、 (c )於加壓或加熱處理下令該低熔點金屬逆流並且 形成焊料凸點之步驟、及 (d )將該雙層層合薄膜由基板上剝離、除去之步驟 〇 2. 如申請專利範圍第1項之焊料凸點形成方法,其中 該非感放射線性樹脂組成物爲含有具有酚性羥基的化合物 〇 3. 如申請專利範圍第1項或第2項之焊料凸點形成方法 ,其中該非感放射線性樹脂組成物爲含有丙烯酸樹脂。 4. 如申請專利範圍第1項之焊料凸點形成方法,其中 該雙層層合薄膜之下層爲由液狀或乾式薄膜狀之非感放射 線性樹脂組成物所形成。 5 ·如申請專利範圍第1項之焊料凸點形成方法,其中 該雙層層合薄膜之上層爲由液狀或乾式薄膜狀之負型感放 射線性樹脂組成物所形成。 6.如申請專利範圍第1項之焊料凸點形成方法,其中 _44 - (2) 1304315 該雙層層合薄膜爲由具有下層及上層雙層構造的乾式薄膜 所形成。 7. 如申請專利範圍第1項之焊料凸點形成方法,其中 該(d )步驟爲由準備具有多段浸漬槽之剝離設備,且於 第一槽使用有機溶劑將雙層層合薄膜予以剝離並且將剝離 片予以循環過濾後’於第二槽以後將該層合薄膜以含有有 機鹼成分之剝離液予以剝離所構成。 8. 如申請專利範圍第1項之焊料凸點形成方法,其中 該(d )步驟爲由準備具有多段浸漬槽之剝離設備,且於 第一槽使用二甲基亞硕將雙層層合薄膜予以剝離並且將剝 離片予以循環過濾後,於第二槽以後將該層合薄膜以含有 機鹼成分和二甲基亞硕之剝離液予以剝離所構成。 9. 如申請專利範圍第1項之焊料凸點形成方法,其中 該電路基板爲由矽晶圓所構成之基材、與該基材表面所設 置之多數的電極底座所構成。 10. 如申請專利範圍第1項之焊料凸點形成方法,其中 該電路基板爲由矽晶圓所構成之基材、與該基材表面所設 置之多數的電極底座、與該電極底座之側面及側端面上所 形成的鈍化膜所構成。 11. 如申請專利範圍第1項之焊料凸點形成方法,其中 該電路基板爲由玻璃環氧樹脂或雙馬來醯亞胺-三畊樹脂 所構成之基材、與複數的電極底座所構成。 12. 如申請專利範圍第1項之焊料凸點形成方法,其中 該電路基板爲由玻璃環氧樹脂或雙馬來醯亞胺-三畊樹脂 所構成之基材、與該基材上所設置之層間樹脂絕緣層及導 - 45… (3) 1304315 體電路、與該導體電路上所設置之複數電極底座所構成。 1 3 .如申請專利範圍第1項〜第1 2項中任一項之焊料凸 點形成方法,其中該低熔點金屬爲焊錫。
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TW092123058A 2002-08-22 2003-08-21 Method of forming solder bump on electrode base formed by double-layered film TW200405784A (en)

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