TW201629455A - 加熱接合用片材及附有切晶帶之加熱接合用片材 - Google Patents
加熱接合用片材及附有切晶帶之加熱接合用片材 Download PDFInfo
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- TW201629455A TW201629455A TW104143019A TW104143019A TW201629455A TW 201629455 A TW201629455 A TW 201629455A TW 104143019 A TW104143019 A TW 104143019A TW 104143019 A TW104143019 A TW 104143019A TW 201629455 A TW201629455 A TW 201629455A
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/10—Adhesives in the form of films or foils without carriers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
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- C09J11/04—Non-macromolecular additives inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/08—Homopolymers or copolymers of acrylic acid esters
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/24—Homopolymers or copolymers of amides or imides
- C09J133/26—Homopolymers or copolymers of acrylamide or methacrylamide
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
- C09J5/06—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving heating of the applied adhesive
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/35—Heat-activated
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
- C09J9/02—Electrically-conducting adhesives
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/6835—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
- H01L21/6836—Wafer tapes, e.g. grinding or dicing support tapes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0806—Silver
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K2003/085—Copper
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- C—CHEMISTRY; METALLURGY
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Abstract
本發明係提供一種能抑制黏晶時之溢出或覆蓋到晶片表面,且即使在高溫環境中亦可得到高信賴性、熱特性之加熱接合用片材。
該加熱接合用片材,其拉伸彈性率為10~3000MPa;其包含之金屬微粒子在60~98重量%範圍內,在大氣環境下,以昇溫速度10℃/分之條件下,從23℃昇溫到400℃後以能量分散型X射線分析所得之碳濃度為15重量%以下者。
Description
本發明是關於一種加熱接合用片材及附有切晶帶之加熱接合用片材。
半導體裝置之製造中,將半導體元件接著在金屬導線架等被黏物之方法(所謂的晶片接合法),從習知的金-矽共晶開始,發展到藉由焊接、樹脂膏之方法。現今,有使用導電性之樹脂膏之方法。
然而,利用樹脂膏之方法,會有因空隙而導電性降低、樹脂膏的厚度不均、樹脂膏的溢出而汙染墊子等問題。為解決此等問題,有使用含有聚醯亞胺之薄膜狀接著劑來取代樹脂膏(例如,參照專利文獻1)。
含有丙烯酸樹脂的薄膜狀接著劑也為習知。例如,特許文獻2中,記載了藉由使用玻璃轉移溫度-10℃~50℃的丙烯酸共聚物,能增加可撓性,降低導線架等的熱損傷之技術。
此外,近年,進行電力控制或供給的電力半導體裝置的普及變得顯著。電力半導體裝置因電流隨時在流通,發熱量大。因此,使用在電力半導體裝置的接著劑,就被期望要具有高散熱性和低電阻率。
電力半導體裝置係要求能以低損失進行高速作動。過去,電
力半導體裝置使用IGBT(絕緣閘雙極電晶體,Insulated Gate Bipolar Transistor)或MOSFET(金氧半場效應電晶體,Metal-Oxide-Semiconductor Field-Effect Transistor)等的使用Si的半導體。近年,使用SiC或GaN等的半導體也被開發,可預期以後之擴大發展。
使用SiC或GaN的半導體,有能隙大、絕緣破壞電場高等特徵,可低損失、高速作動、且高溫作動。高溫作動,是在熱環境嚴苛的汽車或小型電力變換機等之優勢所在。用在熱環境嚴苛用途的半導體裝置,預計係於250℃左右的高溫作動,習知的接合‧接著材料之焊接和導電性接著劑上會有熱特性、信賴性的問題產生。因此,過去曾提案含有燒結金屬粒子的膏狀材料(例如,參照專利文獻3)。含有燒結金屬粒子的膏狀材料裡,係含有奈米‧微米尺寸的金屬粒子,這些金屬粒子在奈米尺寸效果下會以比較一般的熔點更低的溫度,進行熔解,並進行粒子間的燒結。由於其藉由燒結來結合,因此即使在250℃環境中也能有高信賴性、以及高熱特性。
【專利文獻1】特開平6-145639號公報
【專利文獻2】特許4137827號公報
【專利文獻3】特開2014-111800號公報
【專利文獻4】特開2013-39580號公報
然而,含有燒結金屬粒子的膏狀材料,因屬於膏狀,在半導體晶片黏晶時會發生溢出或,覆蓋到晶片表面上的情況發生。因此,可能會產生傾斜,造成半導體裝置製造的產量降低或性能的偏差。特別是,使用高電壓的時候,晶片傾斜使接合距離不均,造成裝置的特性變差。又,專利文獻4雖揭露加熱接合用片材體,惟該加熱接合用片材體為高黏度之加熱接合用材料,以加壓做成片狀而成,並無法解除加熱接合時的溢出或覆蓋到晶片表面上之疑慮。
本發明有鑑於前述問題點,其目的在於提供一種可抑制黏晶時的溢出或覆蓋到晶片表面上,且即使在高溫環境下亦具有高信賴性、熱特性的加熱接合用片材,以及具有該加熱接合用片材之附有切晶帶之加熱接合用片材。
本案發明人等,檢討了關於能解決前述傳統的問題點之加熱接合用片材,以及具有該加熱用片材的附有切晶帶的加熱接合用片材。其結果,發現藉由採用下述的構成,能抑制黏晶時的溢出或覆蓋到晶片表面上之情形,且即使在高溫環境下亦具有高信賴性、熱特性,從而完成本發明。
亦即,本發明之加熱接合用片材,其特徵為其係藉由下述拉
伸試驗方法所得之拉伸彈性率為10~3000MPa;其包含之金屬微粒子在60~98重量%範圍內,在大氣環境下,昇溫速度10℃/分之條件時,從23℃昇溫到400℃後以能量分散型X射線分析所得之碳濃度為15重量%以下;且拉伸試驗方法係:(1)準備厚度200μm、寬10mm、長40mm的加熱接合用片材,作為試驗材料,(2)在夾具間距離為10mm、拉伸速度為50mm/分、23℃的條件下進行拉伸試驗,(3)以所得的應力-應變曲線圖之直線部分之斜率作為拉伸彈性率。
根據前述構成,由於藉由上述拉伸試驗方法所得的拉伸彈性率為10MPa以上,因此能抑制黏晶時加熱接合用片材的構成材料溢出或覆蓋到晶片表面上,又,由於前述的拉伸彈性率在3000MPa以下,所以例如能在切晶時固定半導體晶圓。又,因包含之金屬微粒子在60~98重量%的範圍內,能夠燒結金屬微粒子,或者,使其熔融而接合兩個物(例如,半導體晶片與導線架)。
又,在大氣環境下,由於以昇溫速度10℃/分之條件,從23℃昇溫到400℃後以能量分散型X射線分析所得之碳濃度為15重量%以下,故昇溫到400℃後,有機物幾乎不存在。其結果,在加熱接合步驟後,耐熱性優良,在高溫環境下亦具高信賴性、熱特性。
前述構成中,在大氣環境下,以昇溫速度10℃/分的條件,從23℃到500℃進行熱示差分析時之峰值,較佳係存在於150
~350℃。
如前述峰值存在於150~350℃時,有機物(例如,構成加熱接合用片材的樹脂成分)會在此溫度範圍熱分解。其結果,加熱接合步驟後的耐熱性將更加優良。
前述構成中,較佳係含有丙烯酸樹脂、及聚碳酸酯樹脂中至少一種者。
如含有丙烯酸樹脂、及聚碳酸酯樹脂中至少一種時,加熱接合步驟前,將更容易維持為片狀。又,加熱接合步驟時,將更容易使其熱分解。
前述構成中,前述金屬微粒子較佳係選自銀、銅、氧化銀、氧化銅所成群中至少一種者。
前述金屬微粒子如係選自銀、銅、氧化銀、氧化銅所成群中至少一種時,可更適合加熱接合。
前述構成中,其於23℃之厚度係以5~100μm為佳。
於23℃之厚度,如係5μm以上時,更能抑制溢出。此外,若係100μm以下,將更能抑制加熱接合時的傾斜產生。
又,本發明中附有切晶帶之加熱接合用片材,其中,其係具有切晶帶,以及積層於前述切晶帶上之前述加熱接合用片材。
前述附有切晶帶之加熱接合用片材中,因與切晶帶一體成形,故能省略與切晶帶貼合的步驟。又,因具備前述加熱接合用片材,故
能抑制加熱接合時的溢出或覆蓋到晶片表面上。
又,其能燒結金屬微粒子,或者,使之熔融而接合兩個物(例如,半導體晶片與導線架)。
又,在大氣環境下,因昇溫速度10℃/分之條件,從23℃昇溫到400℃後以能量分散型X射線分析所得之碳濃度為15重量%以下,故昇溫到400℃後,有機物幾乎不存在。其結果,加熱接合步驟後,耐熱性優良,在高溫環境下亦具高信賴性、熱特性。
1‧‧‧基材
2‧‧‧黏著劑層
3、3’‧‧‧加熱接合用片材
4‧‧‧半導體晶圓
5‧‧‧半導體晶片
6‧‧‧被黏物
7‧‧‧焊接導線
8‧‧‧密封樹脂
10、12‧‧‧附有切晶帶之加熱接合用片材
11‧‧‧切晶帶
【圖1】說明本發明之一實施型態中,附有切晶帶之加熱接合用片材之斷面模式圖。
【圖2】說明本發明之另一實施型態中,附有切晶帶之加熱接合用片材之斷面模式圖。
【圖3】說明本實施型態中,半導體裝置之一製造方法之斷面模式圖。
(附有切晶帶之加熱接合用片材)
本發明之一實施型態中,關於加熱接合用片材(以下亦稱為「加熱接合用片材」),以及附有切晶帶之加熱接合用片材,在以下進行說明。本實施型態中的加熱接合用片材,可列舉如下述說明之附有切晶帶之加熱接合用片材中,其係沒有貼上切晶帶的狀態。因此,以下說明附有切晶帶之加熱接
合用片材,並就加熱接合用片材在其中加以說明。圖1係表示本發明之一實施型態的附有切晶帶之加熱接合用片材的斷面模式圖。圖2係表示本發明之另一實施型態的其他附有切晶帶之加熱接合片材的斷面模式圖。
如圖1所示,附有切晶帶之加熱接合用片材10係具有在切晶帶11上積層加熱接合用片材3之構成。切晶帶11係在基材1上積層黏著劑層2所構成,而加熱接合用片材3設置於該黏著劑層2上。又,本發明,如圖2所示附有切晶帶之加熱接合用片材12,亦可以僅在加工黏貼部分上形成加熱接合用片材3’之構成。
(加熱接合用片材)
加熱接合用片材3、3’,藉由下述拉伸試驗方法所得之拉伸彈性率,其係10MPa~3000MPa,較佳係12MPa~2900MPa,更佳則係15MPa~2500M。
拉伸試驗方法:(1)準備厚度200μm、寬10mm、長40mm的加熱接合用片材(拉伸試驗用加熱接合用片材),作為試驗材料,(2)在夾具間距離為10mm、拉伸速度為50mm/分、23℃的條件下進行拉伸試驗,(3)以所得的應力-應變曲線圖之直線部分之斜率作為拉伸彈性率。
加熱接合用片材3、3’,因藉由上述拉伸試驗方法所得之拉伸彈性率係10MPa以上,能抑制黏晶時加熱接合用片材之構成材料的溢出或覆蓋到晶片表面上。又,由於前述拉伸彈性率係3000MPa以下,因此例如在切割時能固定半導體晶圓。
加熱接合用片材3、3’係以相對於加熱接合用片材全體而含有之金屬微粒子在60~98重量%的範圍內。前述金屬微粒子的含有量,在65~97重量%的範圍內為佳,在70~95重量%範圍內更佳。因前述金屬微粒子含量在60~98重量%範圍內,故能燒結金屬微粒子,或使其熔融而接合兩個物(例如,半導體晶片及導線架)。
前述金屬微粒子,可列舉為燒結性金屬粒子。
前述燒結性金屬粒子,適合使用金屬微粒子的凝集體。金屬微粒子可列舉由金屬所成之微粒子等。前述金屬可列舉為金、銀、銅、氧化銀、氧化銅等。其中,較佳係選自銀、銅、氧化銀、氧化銅所成群中至少一種。如前述金屬微粒子係選自銀、銅、氧化銀、氧化銅所成群中至少一種時,可更適合地進行加熱接合。
前述燒結性金屬粒子之平均粒徑係以0.0005μm以上為佳,0.001μm以上更佳。又,0.005μm以上,0.01μm以上亦可。平均粒徑之下限,可例示為0.01μm、0.05μm、0.1μm。進一步,亦可例示為0.5μm、1μm。此外,燒結性金屬粒子之平均粒徑係以30μm以下為佳,25μm以下更佳。平均粒徑之上限,可例示為20μm、15μm、10μm、5μm。
前述燒結性金屬粒子之平均粒徑由以下方法測量。亦即,前述燒結性金屬粒子用SEM(掃描式電子顯微鏡)觀察,測量平均粒徑。又,SEM觀察中,例如,燒結性金屬粒子為微米尺寸時,用5000倍觀察;亞微米尺寸時,用50000倍觀察;奈米尺寸時,用300000倍觀察為佳。
前述燒結性金屬粒子之形狀無特別限定,例如,球狀、棒狀、鱗片狀、不定形。
加熱接合用片材3、3’在大氣環境下,昇溫速度10℃/分之條件時,從23℃到昇溫400℃後以能量分散型X射線分析所得之碳濃度為15重量%以下,較佳係12重量%以下,更佳係10重量%以下。因前述碳濃度為15重量%以下,所以加熱接合用片材3、3’在昇溫到400℃後有機物幾乎不存在。其結果,加熱接合步驟後之耐熱性優良,在高溫環境亦有高信賴性、熱特性。
加熱接合用片材3、3’在大氣環境下,昇溫速度10℃/分的條件時,從23℃到500℃進行熱示差分析時之峰值存在於150~350℃為佳,峰值存在於170~320℃較佳,峰值存在於180~310℃更佳。前述峰值存在於150~350℃時,有機物(例如,構成加熱接合用片材之樹脂成分)會在此溫度範圍熱分解。其結果,加熱接合步驟後的耐熱性將更優良。
加熱接合用片材3、3’係含有熱分解性黏合劑為佳。含有熱分解黏合劑時,在加熱接合步驟前,容易維持片材形狀。又,在加熱接合步驟時容易使其熱分解。
本說明書中所謂「熱分解性黏合劑」,係指加熱接合步驟中可使其熱分解之黏合劑。前述熱分解性黏合劑,在加熱接合步驟後,幾乎不殘留在加熱接合用片材者為佳。前述熱分解性黏合劑,可列舉例如,即使包含在加熱接合用片材中,在昇溫速度10℃/分之條件時,從23℃昇溫到400℃後以能量分散型X射線分析所得之碳濃度為15重量%以
下之材料。例如,作為熱分解黏合劑,如採用更容易熱分解之材料時,即使相對含有量較多,亦可在加熱接合步驟後,幾乎不殘留在加熱接合用片材上。
前述熱分解性黏合劑,在常溫(23℃)為固體材料為佳。前述熱分解性黏合劑,如在常溫(23℃)為固體材料時,在常溫加熱接合用片材就容易形成薄膜狀,而提高運用性。
前述熱分解性黏合劑,可列舉為丙烯酸樹脂、聚碳酸酯樹脂。
前述丙烯酸樹脂,在加熱接合步驟可使其熱分解的範圍中,可列舉為碳數30以下,尤其係具有碳數4~18的直鏈或者分枝的烷基的丙烯酸,或甲基丙烯酸的酯之1種或2種以上作為成分之聚合物(丙烯酸共聚物)等。前述烷基可列舉例如,甲基、乙基、丙基、異丙基、n-丁基、t-丁基、異丁基、戊基、異戊基、己基、庚基、環己基、2-乙基己基、辛基、異辛基、壬基、異壬基、癸基、異癸基、十一烷基、十二烷基、十三烷基、十四烷基、硬脂基、十八烷基,或月桂基等。
又,作為形成聚合物(丙烯酸共聚物)之其他單體,無特別限定,可列舉例如丙烯酸、甲基丙烯酸、丙烯酸羧乙酯、丙烯酸羧戊酯、衣康酸、馬來酸、富馬酸、或巴豆酸等含有羧基的單體,馬來酸酐或衣康酸酐等酸酐單體,(甲基)丙烯酸2-羥乙基、(甲基)丙烯酸2-羥丙基、(甲基)丙烯酸4-羥丁基、(甲基)丙烯酸6-羥己基、(甲基)丙烯酸8-羥辛基、(甲基)丙烯酸10-羥癸基、(甲基)丙烯酸12-羥十二烷基或(4-羥甲基環己基)-丙烯酸甲酯等含有羥基的單體、苯乙烯磺酸、丙烯磺酸、2-(甲基)丙烯醯胺-2-甲基丙磺酸、(甲基)丙烯醯
胺丙磺酸、丙磺酸(甲基)丙烯酸酯或(甲基)丙烯醯氧基萘磺酸等含有磺酸基之單體,或2-羥乙基丙烯醯基磷酸酯等含有磷酸基之單體。
丙烯酸樹脂之中,較佳係重量平均分子量為1萬~100萬者,更佳係3萬~70萬者。在上述數值範圍內時,加熱接合步驟前的接著性,以及加熱接合步驟時的熱分解性優良故耳。又,重量平均分子量是藉由GPC(凝膠滲透層析儀)測量,由聚苯乙烯換算而得之數值。又,丙烯酸樹脂中,較佳係在200℃~400℃熱分解的丙烯酸樹脂。
前述聚碳酸酯樹脂,如能在加熱接合步驟中使之熱分解者即可,並無特別限定,可列舉為主鏈的碳酸酯基(-O-CO-O-)間不含芳香族化合物(例如,苯環等),由脂肪族鏈構成的脂肪族聚碳酸酯,或主鏈的碳酸酯基(-O-CO-O-)間含芳香族化合物的芳香族聚碳酸酯。其中,以脂肪族聚碳酸酯為佳。
前述脂肪族聚碳酸酯,可列舉為聚乙烯碳酸酯、聚丙烯碳酸酯等。其中,以形成片材的塗漆製造中對有機溶劑的溶解性的觀點而言,以聚乙烯碳酸酯為佳。
前述芳香族聚碳酸酯,可列舉主鏈含雙酚A構造者等。
前述聚碳酸酯樹脂的重量平均分子量在10,000~1,000,000的範圍內較合適。又,重量平均分子量是藉由GPC(凝膠滲透層析儀)測量,由聚苯乙烯換算而得之數值。
又,加熱接合用片材3、3’,除前述成分以外,例如,可適當含有可塑劑等。
加熱接合用片材3、3’,可用一般方法製造。例如,製造
含有前述各成分的塗漆,以塗漆在基材隔板上塗佈成所定厚度,形成塗佈膜後,乾燥該塗佈膜,即可製造加熱接合用片材3、3’。
作為塗漆所使用的溶媒雖無特別限定,惟較佳係能使前述各成分均一溶解、混練或分散的有機溶劑或酒精溶劑。前述有機溶劑,可列舉例如,為二甲基甲醯胺、二甲基乙醯胺、N-甲基吡咯烷酮、丙酮、丁酮、環己酮等酮系溶媒、甲苯、二甲苯等。又,前述酒精溶劑,可列舉為乙二醇、二甘醇、1,2-丙二醇、1,3-丙二醇、1,2-丁二醇、1,3-丁二醇、1,4-丁二醇、2-丁烯-1,4-二醇、1,2,6-己三醇、丙三醇、辛二醇、2-甲基-2,4-戊二醇、松油醇。
塗佈方法無特別限定。作為溶劑塗工方法,可列舉例如,薄膜塗佈機、凹版塗佈機、滾輪式塗佈機、反向式塗佈機、刮刀式塗佈機、管刮刀塗佈機、網版印刷等。其中,以塗佈厚度之均一性較高之觀點,較佳係薄膜塗佈機。又,塗佈膜的乾燥條件無特別限定,例如,可以乾燥溫度70~160℃、乾燥時間1~5分鐘進行。又,塗佈膜乾燥後根據所使用的溶劑種類,會有溶劑無全部氣化而殘留於塗膜中之情形。
基材隔板,可使用藉由聚對苯二甲酸乙二酯(PET)、聚乙烯、聚丙烯、或氟素系剥離劑、長鏈烷基丙烯酸酯系剝離劑等之剝離劑進行表面塗佈的塑膠薄膜或紙張。
加熱接合用片材3、3’的製造方法,例如,前述各成分以攪拌器混合,所得之混合物加壓成形製造加熱接合用片材3、3’的方法等亦為合適。攪拌器可列舉為行星攪拌器等。
加熱接合用片材3、3’,在加熱前23℃之厚度,較佳係
5~100μm,更佳係10~80μm。在23℃之厚度為5μm以上時,更能抑制溢出。此外,100μm以下時,更能抑制加熱接合時之傾斜。
(切晶帶)
切晶帶11係在基材1上積層黏著劑層2所構成者。
基材1係附有切晶帶之加熱接合用片材10、12之強度母體,較佳係具有紫外線透過性者。基材1,可列舉例如,低密度聚乙烯、直鏈狀聚乙烯、中密度聚乙烯、高密度聚乙烯、超低密度聚乙烯、隨機共聚合聚丙烯、嵌段共聚合聚丙烯、均聚丙烯、聚丁烯、聚甲基戊烯等聚烯烴,乙烯-醋酸乙烯共聚合物、離子鍵聚合物樹脂、乙烯-(甲基)丙烯酸共聚合物、乙烯-(甲基)丙烯酸酯(隨機、交替)共聚合物、乙烯-丁烯共聚合物、乙烯-己烯共聚合物、聚胺酯、聚乙烯對苯二甲酯、聚乙烯萘二甲酯等的聚酯,聚碳酸酯、聚醯亞胺、聚醚醚酮、聚醚醯亞胺、聚醯胺、全芳香族聚醯胺、聚二苯硫醚、芳綸(紙)、玻璃、玻璃布、氟素樹脂、聚氯乙烯、聚偏二氯乙烯、纖維素樹脂、矽酮樹脂、金屬(箔)、紙等。
又,基材1之材料,可列舉為前述樹脂之交聯等之聚合物。前述塑膠薄膜,可不做延伸處理,亦可視需要進行一軸或二軸之延伸處理。如藉由延伸處理等賦予熱伸縮性之樹脂片材,在切割後該基材1可藉由熱收縮使黏著劑層2與加熱接合用片材3、3’之接著面積降低,可達到使半導體晶片之回收容易化的目的。
基材1之表面,為提高與鄰接層之密著性、保持性等,可實施慣用之表面處理,例如,鉻酸處理、臭氧暴露、火焰暴露、高壓電擊暴
露、離子化放射線處理等化學性或物理性處理,利用底塗劑(例如,下述黏著物質)所進行之塗佈處理。
基材1之厚度並無特別的限制,可適當地決定,一般為5~200μm左右。
用於黏著劑層2之形成的黏著劑並無特別限制,例如,可使用丙烯酸系黏著劑、橡膠系黏著劑等一般感壓性接著劑。前述感壓性接著劑,如基於以半導體晶圓或玻璃等怕污染的電子零件之超純水或酒精等有機溶劑之清淨洗淨性等觀點而言,較佳係以丙烯酸系聚合物作為基礎聚合物之丙烯酸黏著劑。
前述丙烯酸系聚合物,可列舉例如,(甲基)丙烯酸烷基酯(例如,甲酯、乙酯、丙酯、異丙酯、丁酯、異丁酯、s-丁酯、t-丁酯、戊酯、異戊酯、己酯、庚酯、辛酯、2-乙基己酯、異辛酯、壬酯、癸酯、異癸酯、十一酯、十二酯、十三酯、十四酯、十六酯、十八酯、二十酯等烷基之碳數1~30,尤其是碳數4~18的直鏈狀或分枝鏈狀之烷基酯等),以及(甲基)丙烯酸環烷基酯(例如,環戊酯、環己酯等)之1種或2種以上作為單體成分使用之丙烯酸系聚合物等。又,(甲基)丙烯酸酯即係指丙烯酸酯及/或甲基丙烯酸酯,本發明中之(甲基),皆為同樣意義。
丙烯酸系聚合物,以凝集力、耐熱性等的改良為目的,可視需要含有與前述(甲基)丙烯酸烷酯或環烷酯可共聚合之其他單體成分之對應單位。此種單體成分,可列舉例如,丙烯酸、甲基丙烯酸、羧乙基(甲基)丙烯酸酯、羧戊基(甲基)丙烯酸酯、衣康酸、馬來酸、富馬酸、丁
烯酸等含羧基之單體;馬來酸酐、衣康酸酐等酸酐單體;(甲基)丙烯酸2-羥基乙酯、(甲基)丙烯酸2-羥基丙酯、(甲基)丙烯酸4-羥基丁酯、(甲基)丙烯酸6-羥基己酯、(甲基)丙烯酸8-羥基辛酯、(甲基)丙烯酸10-羥基癸酯、(甲基)丙烯酸12-羥基月桂酯、(4-羥基甲基環己基)甲基(甲基)丙烯酸酯等含羥基之單體;苯乙烯磺酸、烯丙基磺酸、2-(甲基)丙烯醯胺-2-甲基丙磺酸、(甲基)丙烯醯胺丙磺酸、磺酸丙基(甲基)丙烯酸酯、(甲基)丙烯醯氧基萘磺酸等含磺酸基之單體;2-羥乙基丙烯醯基磷酸酯等含磷酸基之單體;丙烯醯胺、丙烯腈等。此等可共聚合之單體成分可使用1種或2種以上。此等可共聚合之單體之使用量在全部單體成分之40重量%以下為佳。
進一步,為使前述丙烯酸系聚合物進行交聯,可視需要包含多官能性單體等作為共聚合用單體成分。此種多官能性單體,可列舉例如,己二醇二(甲基)丙烯酸酯、(聚)乙二醇二(甲基)丙烯酸酯、(聚)丙二醇二(甲基)丙烯酸酯、新戊二醇二(甲基)丙烯酸酯、季戊四醇二(甲基)丙烯酸酯、三羥甲基丙烷三(甲基)丙烯酸酯、季戊四醇三(甲基)丙烯酸酯、二季戊四醇六(甲基)丙烯酸酯、環氧(甲基)丙烯酸酯、聚酯(甲基)丙烯酸酯、胺基甲酸(甲基)丙烯酸酯等。此等多官能性單體亦可使用1種或2種以上。就黏著特性等之觀點而言,多官能性單體之使用量在全部單體成分之30重量%以下為佳。
前述丙烯酸系聚合物係,可藉由使單一單體或2種以上之單體混合物進行聚合而得。聚合亦可以溶液聚合、乳化聚合、塊狀聚合、懸浮聚合等任一方式進行。以防止對潔淨之被黏物之污染等之觀點而言,以
低分子量物質之含量較小為佳。以此點而言,丙烯酸系聚合物之數量平均分子量較佳係10萬以上,更較佳係20萬~300萬左右,特佳係30萬~100萬左右。
又,由於前述黏著劑中,作為基礎聚合物之丙烯酸系聚合物等之數量平均分子量提高,因此可適宜地採用外部交聯劑。作為外部交聯方法之具體手段,可列舉添加聚異氰酸酯化合物、環氧化合物、氮丙環化合物、三聚氰胺系交聯劑等所謂交聯劑使其反應之方法。使用外部交聯劑時,其使用量係根據與該應交聯之基礎聚合物之平衡,進一步,可根據作為黏著劑之使用用途來適當決定。一般而言,對於前述基礎聚合物100重量份,以約5重量份以下,進一步以0.1~5重量份配合為佳。進一步,黏著劑視需要,除前述成分外,亦可使用過去習知的各種黏著賦予劑、抗老化劑等之添加劑。
黏著劑層2能以放射線硬化型黏著劑形成。放射線硬化型黏著劑,藉由紫外線等放射線的照射增大交聯程度,從而可容易地使其黏著力降低,藉由僅在圖2所示黏著劑層2之加工黏貼部分之對應部分2a照射放射線,能使與其他部分2b之黏著力造成差異。
此外,藉由使圖2所示之加熱接合用片材3’同時和放射線硬化型之黏著劑層2硬化,可容易地形成黏著力明顯降低之前述部分2a。由於在硬化、黏著力降低之前述部分2a貼附加熱接合用片材3’,在黏著劑層2的前述部分2a與加熱接合用片材3’之界面,具有在撿拾時容易剝離的性質。此外,未照射放射線之部分具有足夠的黏著力,而形成前述部分2b。又,對黏著劑層之放射線照射,亦可在切割後撿拾前進
行。
如同前述,圖1所示附有切晶帶之加熱接合用片材10之黏著劑層2中,由未硬化之放射線硬化型黏著劑所形成的前述部分2b係與加熱接合用片材3黏著,能確保切割時之保持力。如此地,放射線硬化型黏著劑能將用以固定晶片狀加工品(半導體晶片等)於基板等被黏物之加熱接合用片材3,在接著‧剝離的平衡良好情形下進行支撐,圖2所示附有切晶帶之加熱接合用片材11之黏著劑層2中,前述部分2b能固定晶片環。
放射線硬化型黏著劑係具有碳-碳雙鍵等放射線硬化性之官能基,且可使用表現黏著性之物質,而無特別限制。放射線硬化型黏著劑,可例示如,在前述丙烯酸系黏著劑、橡膠系黏著劑等一般感壓性黏著劑上,配合放射線硬化性之單體成分或低聚物成分之添加型放射線硬化型黏著劑。
配合放射線硬化性之單體成分,可列舉例如,為胺基甲酸酯低聚物、胺基甲酸(甲基)丙烯酸酯、三羥甲基丙烷三(甲基)丙烯酸酯、四羥甲基甲四(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、二季戊四醇單羥基五(甲基)丙烯酸酯、二季戊四醇六(甲基)丙烯酸酯、1,4-丁二醇二(甲基)丙烯酸酯等。又,放射線硬化性之低聚物成分可列舉胺基甲酸酯系、聚醚系、聚酯系、聚碳酸酯系、聚丁二烯系等各種低聚物,其分子量係100~30000左右之範圍者為適當。放射線硬化性之單體成分或低聚物成分之配合量,可因應前述黏著劑層之種類、黏著劑層之黏著力之可降低量,做適當的決定。
一般而言,對於構成黏著劑之丙烯酸系聚合物等的基礎聚合物100重量份,例如為5~500重量份、較佳為40~150重量份左右。
又,放射線硬化型黏著劑,除前述說明之添加型放射線硬化型黏著劑外,基礎聚合物還可列舉使用內在型之放射線硬化型黏著劑,其係在聚合物側鏈或主鏈中間或主鏈末端具有碳-碳雙鍵者。內在型放射線硬化型黏著劑,因不需含有低分子成分之低聚物或含量不多,故低聚物成分不會隨時間經過在黏著劑中移動,能形成安定層構造之黏著劑層而較佳。
前述具有碳-碳雙鍵之基礎聚合物,可使用具有碳-碳雙鍵且具有黏著性者,並無特別限制。作為此種基礎聚合物,基本骨架係以丙烯酸系聚合物者為佳。作為丙烯酸系聚合物之基本骨架,可列舉前述例示之丙烯酸系聚合物。
前述對丙烯酸系聚合物之碳-碳雙鍵之導入法無特別限制,可採用各種方法,以分子設計之觀點,係以碳-碳雙鍵導入聚合物側鏈為容易。可列舉例如,事先,在丙烯酸系聚合物單體中共聚合具有官能基之單體後,將可與此官能基反應之官能基以及具有碳-碳雙鍵之化合物,在維持碳-碳雙鍵之放射線硬化性狀態下使其縮合或加成反應之方法。
此等官能基之組合之例,可列舉羧酸基和環氧基、羧酸基和氮丙環基、羥基和異氰酸酯基等。此等官能基之組合中,從追蹤反應之容易度而言,係以羥基和異氰酸酯基之組合較適合。又,依這些官能基之組合,如果是生成前述具有碳-碳雙鍵之丙烯酸系聚合物之組合時,官能基在丙烯酸系聚合物和前述化合物之任一側皆可;而前述較佳之組合,丙烯酸系聚合物具有羥基,前述化合物具有異氰酸酯基之情形則為合適。此種
情形,具有碳-碳雙鍵之異氰酸酯化合物,可列舉例如,甲基丙烯醯異氰酸酯、2-甲基丙烯醯氧乙基異氰酸酯、m-異丙烯-α、α-二甲基芐基異氰酸酯等。又,丙烯酸系聚合物,可使用者有前述例示之含有羥基之單體或2-羥基乙基乙烯醚、4-羥基丁基乙烯醚、二甘醇單乙烯醚之醚系化合物等,進行共聚合者。
前述內在型之放射線硬化型黏著劑,可單獨使用前述含有碳-碳雙鍵之基礎聚合物(尤其係丙烯酸系聚合物),也可在不惡化其特性的程度配合前述放射線硬化性之單體成分或低聚物成分等。放射線硬化性之低聚物成分等,對於通常基礎聚合物100重量份係30重量份之範圍內,較佳則係0~10重量份之範圍。
前述放射線硬化型黏著劑,如藉由紫外線等使之硬化時,係含有光聚合引發劑。作為光聚合引發劑,可列舉例如,4-(2-羥基乙氧基)苯基(2-羥基-2-丙基)酮、α-羥基-α,α’-二甲基苯乙酮、2-甲基-2-羥基苯丙酮、1-羥基環己苯酮等之α-酮系化合物;甲氧基苯乙酮、2,2-二甲氧基-2-苯基苯乙酮、2,2-二乙氧基苯乙酮、2-甲基-1-〔4-(甲硫)-苯基〕-2-嗎啉丙烷-1等苯乙酮系化合物;苯偶姻乙醚、苯偶姻異丙醚、茴香偶姻甲醚等之苯偶姻乙醚系化合物;芐基二甲基縮酮等之縮酮系化合物;2-萘磺醯氯等之芳香族磺醯氯系化合物;1-苯甲酮-1,1-丙二酮-2-(o-乙氧羰基)肟等之光活性肟系化合物;二苯甲酮、苯甲醯安息香酸、3,3’-二甲基-4-甲氧基二苯甲酮等之二苯甲酮系化合物;噻噸酮、2-氯噻噸酮、2-甲基噻噸酮、2,4-二甲基噻噸酮、異丙基噻噸酮、2,
4-二氯噻噸酮、2,4-二乙基噻噸酮、2,4-二異丙基噻噸酮等之噻噸酮系化合物;樟腦醌;鹵化酮;醯基氧化磷;醯基磷酸酯等。光聚合引發劑之配合量,相對於構成黏著劑之丙烯酸系聚合物等之基礎聚合物100重量份,例如為0.05~20重量份左右。
又,放射線硬化型黏著劑,可列舉例如,特開昭60-196956号公報所揭露,有2個以上不飽和鍵之加成聚合化合物,含有具有環氧基之烷氧基矽烷等光聚合性化合物,和羰基化合物、有機硫磺化合物、過氧化物、胺、鎓鹽系化合物等之光聚合引發劑之橡膠系黏著劑或丙烯酸系黏著劑等。
前述放射線硬化型之黏著劑層2中,可視需要,含有藉由放射線照射來著色之化合物。藉由放射線照射,藉由使黏著劑層2含有著色之化合物,可使僅被放射線照射之部分著色。亦即,可使圖1所示加工黏貼部分3a之對應部分2a著色。因此,能以目視直接判斷黏著劑層2是否被放射線照射過,加工黏貼部分3a容易被識別,加工之黏貼更為容易。又,用光感測器等檢測半導體晶片時,其檢測精度提高,半導體之撿取時不會發生錯誤操作。藉由放射線著色之化合物,在放射線照射前為無色或淡色,藉由放射線照射成為有色之化合物,可列舉例如無色染料等。藉由放射線著色之化合物之使用比例,可適當設定。
黏著劑層2之厚度,雖無特別限定,但從晶片切斷面之缺陷防止或加熱接合用片材3、3’之固定保持之兼顧性等觀點而言,係以1~50μm左右為佳。較佳為2~30μm,更佳為5~25μm。
本實施型態中附有切晶帶之加熱接合用片材10、12,例
如,能以如下製作。
首先,基材1,可由過去習知的製膜方法來製膜。該製膜方法,可例示如壓延(calendaring)製膜法、在有機溶劑中之鑄膜(casting)法、在密閉系統之吹膜擠出法、T模擠出法、共擠出法、乾式疊層法等。
接著,在基材1上形成塗佈黏著劑組成物溶液並形成塗佈膜後,該塗佈膜在所定條件下乾燥(視需求加熱交聯),形成黏著劑層2。塗佈方法無特別限定,可列舉例如,滾輪塗工、網版塗工、凹版塗工等。又,乾燥條件,例如可在乾燥溫度80~150℃、乾燥時間0.5~5分之間之範圍內進行。又,在隔板上塗佈黏著劑組成物形成塗佈膜後,在前述乾燥條件下乾燥塗佈膜而形成黏著劑層2亦可。之後,在基材1上將隔板與黏著劑層2一起貼合。藉此,製作切晶帶11。
附有切晶帶之加熱接合用片材10,可用一般方法製造。例如,將切晶帶11之黏著劑層2與加熱接合用片材3貼合,可製造附有切晶帶之加熱接合用片材10。
(半導体裝置之製造方法)
本實施型態中之半導體裝置之製造方法包含:準備前述加熱接合用片材之步驟,及介由前述加熱接合用片材,使半導體晶片在被黏物上加熱接合之加熱接合步驟(以下,亦稱為第1實施型態)。
又,本實施型態中半導體裝置之製造方法包含:準備前述所記載之附有切晶帶之加熱接合用片材之步驟,及將前述附有切晶帶之加熱接合用片材與半導體晶圓之背面貼合之貼合步驟,
及將前述半導體晶圓與前述加熱接合用片材一起切割,形成晶片狀之半導體晶片之切晶步驟,及將前述半導體晶片,從前述附有切晶帶之加熱接合用片材,與前述加熱接合用片材一起撿拾之撿拾步驟,及介由前述加熱接合用片材,將前述半導體晶片於被黏物上進行加熱接合之加熱接合步驟(以下,亦稱為第2實施型態)。
第1實施型態中半導體裝置之製造方法,相對於第2之實施型態中半導體裝置之製造方法,其使用附有切晶帶之加熱接合用片材,係在第1實施型態中半導體裝置之製造方法中,於以單體使用加熱接合用片材之部分不同,而其他部分相同。第1之實施型態中半導體裝置之製造方法中,準備加熱接合用片材後,若將其與切晶帶進行貼合步驟,其後,可與第2實施型態中半導體裝置之製造方法相同地進行。因此,以下針對第2實施型態中半導體裝置之製造方法加以說明。
本實施型態中半導體裝置之製造方法中,首先,準備附有切晶帶之加熱接合用片材10、12(準備步驟)。附有切晶帶之加熱接合用片材10、12,可在加熱接合用片材3、3’上任意設置之隔板上適宜地剝離,如以下使用。以下,一邊參照圖3,使用附有切晶帶之加熱接合用片材10之情形為例,加以說明。
首先,附有切晶帶之加熱接合用片材10中加熱接合用片材3之半導體晶圓黏貼部分3a上,壓接半導體晶圓4,將此保持接著並固定(貼合步驟)。本步驟,是用壓著滾輪等之按壓方法一邊按壓一邊進行。
裝載時之黏貼溫度並無特別限定,例如在23~90℃之範圍內為佳。
接著,進行半導體晶圓4之切割(切晶步驟)。藉此,切斷並單片化半導體晶圓4成所定之尺寸,從而製造半導體晶片5。切晶方法雖無特別限定,例如可從半導體晶圓4之迴路面側,按照普通方法進行。又,本步驟,例如可採用附有切晶帶之加熱接合用片材10,來進行切割之稱作全切之切斷方式。本步驟所用的切晶裝置並無特別限定,可使用傳統習知之物。又,由於半導體晶圓4係藉由附有切晶帶之加熱接合用片材10接著固定,故可抑制晶片缺陷或晶片飛散的同時,亦可抑制半導體晶圓4的破損。
接著,為剝離在附有切晶帶之加熱接合用片材10上接著固定之半導體晶片5,進行半導體晶片5之撿拾(撿拾步驟)。撿拾之方法並無特別限定,可採用過去各種習知的方法。可列舉例如將個別半導體晶片5從附有切晶帶之加熱接合用片材10側藉由針突起,再將突起之半導體晶片5經由撿拾裝置撿拾之方法等。
作為撿拾條件,就防止破片之觀點,針的突起速度在5~100mm/秒為佳,在5~10mm/秒更佳。
此處之撿拾,係黏著劑層2為紫外線硬化型之情形,其係在該黏著劑層2照射紫外線後進行。藉此,對於黏著劑層2之加熱接合用片材3之黏著力降低,使半導體晶片5之剝離變得容易。其結果,可在撿拾半導體晶片5時不使其受損。紫外線照射時之照射強度、照射時間等之條件並無特別限定,可視需要適當設定。又,紫外線照射所使用之光源,可使用習知之物。又,黏著劑層事先照射紫外線使其硬化,如將此硬化之黏
著劑層與加熱接合用片材加以貼合的情況,並不需紫外線照射。
接著,撿拾之半導體晶片5,介由加熱接合用片材3,而黏晶(加熱接合)於被黏物6(加熱接合步驟)。被黏物6,可列舉有導線架、TAB薄膜、基板或另外製作之半導體晶片等。被黏物6,例如,可為容易變形之變形型被黏物,亦可為不易變形之非變形型被黏物(半導體晶圓等)。
前述導線架,可列舉Cu導線架、42Alloy導線架等之金屬導線架。又,前述基板,可使用過去習知之物。可列舉例如玻璃環氧基、BT(雙馬來醯亞胺-三嗪)、聚醯亞胺等構成之有機基板。其中,若使用金屬導線架,可藉由加熱接合與金屬微粒子一體化。又,前述基板係在陶瓷板等之絕緣基板上,例如積層銅電路基板之絕緣電路基板。若使用絕緣電路基板,例如,可製造進行電力的控制或供給之電力半導體裝置。
前述加熱接合步驟,藉由加熱燒結金屬微粒子的同時,可視需要熱分解熱分解性黏合劑。加熱溫度為,以180~400℃為佳、190~370℃較佳、在200~350℃進行更佳。又,加熱時間,以0.3~300分為佳、0.5~240分較佳、在1~180分進行更佳。又加熱接合,亦可在加壓條件下進行。加壓條件,以1~500kg/cm2的範圍內為佳、5~400kg/cm2的範圍內更佳。在加壓下之加熱接合,例如,可以如倒裝焊接機之加熱與加壓可同時進行之裝置來進行。又,平行平板加壓亦可。
加熱接合用片材3,因藉由前述拉伸試驗方法所得拉伸彈性率為10MPa以上,故黏晶時(加熱接合時)能抑制加熱接合用片材3
之構成材料溢出,或其覆蓋到半導體晶片5之表面之情形。
又,加熱接合用片材3,因含有金属微粒子在60~98重量%範圍內,故能夠燒結金屬微粒子,或者,使其熔融而接合半導體晶片5和被黏物6(例如,導線架)。
又,加熱接合用片材3,因在大氣環境下,昇溫速度10℃/分之條件時,從23℃昇溫到400℃後以能量分散型X射線分析所得之碳濃度為15重量%以下,故加熱接合步驟後,有機物幾乎不存在。其結果,在加熱接合步驟後,可得到耐熱性優良,且在高溫環境下亦具有高信賴性、熱特性。
接著,可視需要,如圖3所示,在被黏物6之端子部(內引線)之前端與半導體晶片5上之電極墊(無圖示)用焊接導線7做電氣連接(導線焊接步驟)。前述焊接導線7,例如,可使用金線、鋁線或銅線等。進行導線焊接時之溫度在23~300℃,較佳係在23~250℃之範圍內進行。又,在80~250℃之範圍內,在80~220℃之範圍內進行亦可。又,其加熱時間為數秒~數分內進行。結線為在前述溫度範圍內之加熱狀態下,藉由超音波之振動能量與藉由施加電壓之壓接能量之併用下進行。
接著,可視需要,如圖3所示,藉由密封樹脂8密封半導體晶片5(密封步驟)。本步驟係為保護在被黏物6所搭載之半導體晶片5或焊接導線7而實施。本步驟可藉由密封用樹脂在模具成型來實施。密封樹脂8,例如係使用環氧樹脂。樹脂密封時之加熱溫度,通常在175℃、60~90秒之間進行,但本發明並無限定於此,例如可在165~185℃、數分內處理。藉此,使密封樹脂8硬化。又,本密封步驟,亦可採
用在片材狀之密封用片材嵌入半導體晶片5之方法(例如,參照特開2013-7028號公報)。又,藉由模具之密封樹脂的成型外,在箱型容器流入矽酮凝膠之凝膠密封型亦可。
接著,可視需要進行加熱,使在前述密封步驟硬化不足之密封樹脂8完全硬化(後硬化步驟)。本步驟中之加熱溫度,因密封樹脂之種類而異,例如在165~185℃之範圍內,加熱時間為0.5~8小時左右。
又,本發明之加熱接合用片材、及附有切晶帶之加熱接合用片材,亦可適合於積層有複數半導體晶片且立體實裝之情形。此時,可於半導體晶片間積層加熱接合片材及隔離層,亦可不積層隔離層,而僅在半導體晶片間積層加熱接合用片材亦可,可視製造條件或用途等作適當變更。
【實施例】
以下,關於本發明所使用之實施例做詳細的說明,但本發明在不超過其主旨之情況下,並不限於以下之實施例。
關於實施例使用成分加以說明。
丙烯酸樹脂A:綜研化學公司製的SPB-TE1(分子量40000)
丙烯酸樹脂B:綜研化學公司製的IB-27(分子量370000)
聚丙烯碳酸酯樹脂:Empower公司製的QPAC40(分子量200000)
乙基纖維素A:日新化成公司製的乙纖(ETHOCEL)STD100
金屬微粒子A:三井金屬礦業公司製的SPH02J(銀微粒子的凝集體、凝集體的平均粒徑1.8μm、不定形)
金属微粒子混合膏A:應用奈米粒子研究所製的ANP-1(分散有奈米尺寸的銀微粒子的膏)
有機溶劑A:甲基乙基酮(MEK)
酒精溶劑A:松油醇
〔加熱接合用片材之製作〕
依據表1所記載之配合比,將表1所記載之各成分及溶劑放入混合攪拌器(KEYENCE製HM-500)之攪拌鍋中,攪拌模式以3分鐘攪拌‧混合。所得到之塗漆,在離型處理薄膜(三菱樹脂(株)製的MRA50)上進行塗佈‧乾燥(110℃、2分間)。藉此得到實施例及比較例中厚度50μm之加熱接合片材。然而,比較例1,無法成為均一的片材。
〔拉伸彈性率之測定〕
(1)首先,將實施例、比較例所得到加熱接合用片材使其重疊為厚度200μm。接著,裁切成寬10mm、長30mm。
(2)接著,在夾具間距離10mm、拉伸速度50mm/分、在23℃之條件下進行拉伸試驗。此拉伸試驗,係使用島津製作所株式會社的Autograph AGS-J機。
(3)接著,所得到應力-應變曲線圖之應力0.5N及1N之接線之斜率為拉伸彈性率。
結果如表1所示。
〔加熱後之碳濃度之測定〕
將實施例、比較例所得到加熱接合用片材在大氣環境下,昇溫速度10℃/分之條件時,從23℃加溫到400℃,達到400℃後,自然冷
卻至常溫。加溫是使用烤箱。接著,加熱後之樣品(常溫),用EDX(能量分散型X線分析)進行元素分析(定量分析)、測定碳濃度(重量%)。
測定係使用AMETEK株式會社製的產品,產品名:EDAX Model PV77-50780ME。結果如表1所示。
〔熱示差分析之峰值溫度〕
對於實施例、比較例所得到加熱接合用片材,在大氣環境下,昇溫速度10℃/分的條件時,從23℃到500℃進行熱示差分析。測定係使用TG-DTA同時測定裝置(熱重-熱示差同時測定裝置),更具體而言,使用Rikagu公司製的產品,產品名:Thermo Plus TG8210。
接著,從所得到的圖表讀取峰值之溫度。結果如表1所示。
1‧‧‧基材
2‧‧‧黏著劑層
3‧‧‧加熱接合用片材
3a‧‧‧加工黏貼部分
4‧‧‧半導體晶圓
10‧‧‧附有切晶帶之加熱接合用片材
11‧‧‧切晶帶
Claims (6)
- 一種加熱接合用片材,其特徵為其係藉由下述拉伸試驗方法所得之拉伸彈性率為10~3000MPa;其包含之金屬微粒子在60~98重量%範圍內;在大氣環境下,昇溫速度10℃/分之條件下,從23℃到昇溫400℃後以能量分散型X射線分析所得之碳濃度為15重量%以下;且拉伸試驗方法係:(1)準備厚度200μm、寬10mm、長40mm的加熱接合用片材,作為試驗材料,(2)在夾具間距離為10mm、拉伸速度為50mm/分、23℃的條件下進行拉伸試驗,(3)以所得的應力-應變曲線圖之直線部分之斜率作為拉伸彈性率。
- 如申請專利範圍第1項所記載之加熱接合用片材,其中,在大氣環境下,昇溫速度10℃/分的條件時,從23℃到500℃進行熱示差分析時之峰值存在於150~350℃。
- 如申請專利範圍第1項所記載之加熱接合用片材,其中,其係含有丙烯酸樹脂、及聚碳酸酯樹脂中至少一種。
- 如申請專利範圍第1項所記載之加熱接合用片材,其中,前述金屬微粒子係選自銀、銅、氧化銀、氧化銅所成群中至少一種。
- 如申請專利範圍第1項所記載之加熱接合用片材,其中,在23℃之厚度係5~100μm。
- 一種附有切晶帶之加熱接合用片材,其中,其係具有切晶帶,以及積層於前述切晶帶上如申請專利範圍1~5項中任一項所記載之加熱接合用片材。
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-
2015
- 2015-10-16 JP JP2015204211A patent/JP6682235B2/ja active Active
- 2015-12-11 EP EP15872757.8A patent/EP3239258A4/en not_active Withdrawn
- 2015-12-11 CN CN201580070430.3A patent/CN107109146A/zh active Pending
- 2015-12-11 US US15/539,657 patent/US10301509B2/en active Active
- 2015-12-21 TW TW104143019A patent/TWI680289B/zh active
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
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TWI701311B (zh) * | 2015-09-30 | 2020-08-11 | 日商日東電工股份有限公司 | 片材及複合片材 |
US10888929B2 (en) | 2015-09-30 | 2021-01-12 | Nitto Denko Corporation | Sheet and composite sheet |
US11634611B2 (en) | 2015-09-30 | 2023-04-25 | Nitto Denko Corporation | Sheet and composite sheet |
TWI740984B (zh) * | 2016-08-31 | 2021-10-01 | 日商日東電工股份有限公司 | 加熱接合用片材,以及附切晶帶之加熱接合用片材 |
US11390777B2 (en) | 2016-08-31 | 2022-07-19 | Nitto Denko Corporation | Sheet for heat bonding and sheet for heat bonding having dicing tape |
CN110476233A (zh) * | 2017-03-29 | 2019-11-19 | 日东电工株式会社 | 加热接合用片和带有加热接合用片的切割带 |
TWI762603B (zh) * | 2017-03-29 | 2022-05-01 | 日商日東電工股份有限公司 | 加熱接合用片材及附加熱接合用片材之切割帶 |
CN110476233B (zh) * | 2017-03-29 | 2023-09-29 | 日东电工株式会社 | 加热接合用片和带有加热接合用片的切割带 |
Also Published As
Publication number | Publication date |
---|---|
JP6682235B2 (ja) | 2020-04-15 |
EP3239258A4 (en) | 2017-12-20 |
US10301509B2 (en) | 2019-05-28 |
JP2016121329A (ja) | 2016-07-07 |
TWI680289B (zh) | 2019-12-21 |
US20170369744A1 (en) | 2017-12-28 |
EP3239258A1 (en) | 2017-11-01 |
CN107109146A (zh) | 2017-08-29 |
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