TW202127591A - 半導體結構及其製造方法 - Google Patents

半導體結構及其製造方法 Download PDF

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TW202127591A
TW202127591A TW109135384A TW109135384A TW202127591A TW 202127591 A TW202127591 A TW 202127591A TW 109135384 A TW109135384 A TW 109135384A TW 109135384 A TW109135384 A TW 109135384A TW 202127591 A TW202127591 A TW 202127591A
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substrate
cover
semiconductor structure
base
package
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TW109135384A
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TWI764316B (zh
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黃冠育
黃松輝
侯上勇
黃建元
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台灣積體電路製造股份有限公司
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Abstract

揭露一種半導體結構及其製作方法。一種半導體結構包括第一基底、封裝、第二基底以及蓋。封裝貼合到第一基底的第一側。第二基底貼合到第一基底的第二側。蓋連接到第一基底及第二基底。蓋包括:環形部,位於第一基底的第一側之上。環形部及第一基底界定空間且封裝容納在空間中。蓋更包括:多個外懸部,從環形部的轉角側壁朝第二基底延伸,以覆蓋第一基底的轉角側壁。

Description

半導體結構及其製造方法
由於各種電子構件(例如,電晶體、二極體、電阻器、電容器等)的積體密度的持續增加,半導體行業已經歷快速增長。在很大程度上,積體密度的這種增加來自於最小特徵大小(feature size)的不斷地減小,這使得更多的構件能夠集積到給定面積內。
由縮小電子元件的需求增加,亟需更小且更具創造性的半導體晶粒的封裝技術。這種封裝系統的實例是疊層封裝(Package-on-Package,PoP)技術。在PoP元件中,頂部半導體封裝被堆疊在底部半導體封裝的頂部上,以提供高集積水準及構件密度。另一實例是基底上晶圓上晶片(Chip-On-Wafer-On-Substrate,CoWoS)結構,其中半導體晶片貼合到晶圓(例如,中介層)以形成晶圓上晶片(Chip-On-Wafer,CoW)結構。然後將CoW結構貼合到基底(例如,印刷電路板(printed circuit board,PCB))以形成CoWoS結構。這些及其他先進的封裝技術使得半導體元件的生產具有增強的功能及小的佔用面積(footprint)。
以下揭露內容提供用於實施本發明的不同特徵的許多不同的實施例或實例。以下闡述構件及佈置的具體實例以簡化本揭露。當然,這些僅為實例而非旨在進行限制。舉例來說,以下說明中將第一特徵形成在第二特徵之上或第二特徵上可包括其中第一特徵與第二特徵被形成為直接接觸的實施例,且也可包括其中第一特徵與第二特徵之間可形成有附加特徵從而使得所述第一特徵與所述第二特徵可不直接接觸的實施例。另外,本揭露可能在各種實例中重複使用參考編號和/或字母。這種重複使用是出於簡潔及清晰的目的,而不是自身指示所論述的各種實施例和/或配置之間的關係。
此外,為易於說明,本文中可能使用例如“在...之下(beneath)”、“在...下方(below)”、“下部的(lower)”、“在...上方(above)”、“上部的(upper)”等空間相對性用語來闡述圖中所示的一個構件或特徵與另一(其他)構件或特徵的關係。所述空間相對性用語旨在除圖中所繪示的取向外還囊括元件在使用或操作中的不同取向。設備可具有其他取向(旋轉90度或處於其他取向),且本文中所使用的空間相對性描述語可同樣相應地進行解釋。
本揭露也可包括其他特徵及製程。舉例來說,可包括測試結構,以説明對三維(three-dimensional,3D)封裝或三維積體電路(three-dimensional integrated circuit,3DIC)元件進行驗證測試。所述測試結構可包括例如在重佈線層中或在基底上形成的測試焊盤,以使得能夠對3D封裝或3DIC進行測試、使用探針和/或探針卡(probe card)等。可對中間結構以及最終結構實行驗證測試。另外,本文中所揭露的結構及方法可結合包括對已知良好晶粒(known good die)進行中間驗證的測試方法來使用,以提高良率並降低成本。
各種實施例提供包括蓋的半導體結構。蓋具有多個外懸部。外懸部貼合到板,以防止CoWoS結構的翹曲以及CoWoS結構與板之間的冷接縫(cold joint)。另外,外懸部被設置成環繞CoWoS結構的轉角側壁,以保護電連接件並減少電連接件中由於外部應力導致的裂紋。
圖1A到圖5A示出依據各種實施例的製造半導體結構100的中間階段的剖視圖。圖1B到圖5B示出製造圖1A到圖5A的半導體結構100的中間階段的俯視圖。圖6示出圖5A的半導體結構100的透視圖。在各種實施例中,半導體結構100包括封裝103、第一基底110及第二基底104。封裝103可為三維積體電路元件(例如,晶圓上晶片(CoW)封裝),且封裝103可被稱為CoW封裝103。CoW封裝103接合到第一基底110。CoW封裝103與第一基底110的組合可被稱為基底上晶圓上晶片(CoWoS)結構102。CoWoS結構102可包括晶片堆疊,例如邏輯搭載邏輯(logic-on-logic,LoL)、邏輯搭載記憶體(memory-on-logic,MoL)等。
圖1A及圖1B示出CoWoS結構102。在一些實施例中,CoWoS結構102的CoW封裝103包括晶粒106、晶粒108及封裝構件105。晶粒106可與晶粒108相同或不同。舉例來說,第一晶粒106與第二晶粒108具有不同的功耗。在一些實施例中,晶粒106可為高功耗晶粒,而晶粒108可為低功耗晶粒。儘管圖1A示出具有一個晶粒106及一個晶粒108的CoWoS結構102,但其他實施例可包括任意數目的晶粒106和/或晶粒108。晶粒106可設置在兩個晶粒108之間。晶粒106及晶粒108可為晶粒堆疊且可被稱為晶片。晶粒106消耗相對高的功率量,且因此,與較低功耗的晶粒相比會產生相對大量的熱。舉例來說,晶粒106可消耗從約100 W到約1,000 W的功率,且晶粒108可消耗從約10 W到約100 W的功率。晶粒106消耗的功率對晶粒108消耗的功率的比率可為從約10到約30,例如約16。在一些實施例中,晶粒106可為處理器,例如中央處理器(central processing unit,CPU)、圖形處理單元(graphic processing unit,GPU)等。晶粒108可為記憶體晶粒,例如高頻寬記憶體(high bandwidth memory,HBM)、記憶體立方體、記憶體堆疊等。在一些實施例中,晶粒106及108分別為扇出型封裝及扇入型封裝。
晶粒106及晶粒108可被包含模制化合物的包封體120環繞。可將晶粒106、晶粒108及包封體120平坦化,使得晶粒106的頂表面、晶粒108的頂表面及包封體120的頂表面齊平。由於在包封體120中可能不會產生熱量,因此在包封體120附近的區域中散熱要求可能較低。
CoW封裝103的封裝構件105可為中介層基底,所述中介層基底可為半導體基底,例如矽基底。封裝構件105也可由另一種半導體材料(例如矽鍺、碳化矽等)形成。依據一些實施例,在封裝構件105的表面處形成有例如電晶體(未單獨示出)等主動元件。在封裝構件105中也可形成有例如電阻器和/或電容器等被動元件(未單獨示出)。依據本揭露的替代實施例,封裝構件105可為半導體基底或介電基底,且相應的封裝構件105可不包括其中的主動元件。依據這些實施例,封裝構件105可包括或可不包括形成在其中的被動元件。
可形成從封裝構件105的頂表面延伸到封裝構件105中的穿孔。在封裝構件105是矽基底的實施例中,穿孔可被稱為基底穿孔或矽穿孔。在一些實施例中,封裝構件105可包括形成在基底之上的內連線結構(未單獨示出),所述內連線結構用於電連接到積體電路元件(如果有的話)及CoWoS結構102的穿孔。內連線結構可包括多個介電層、形成在介電層中的金屬線、以及形成在上覆金屬線與下伏金屬線之間並將上覆金屬線與下伏金屬線內連的通孔。依據一些實施例,介電層可由氧化矽、氮化矽、碳化矽、氮氧化矽、其組合、和/或其多層形成。做為另外一種選擇,介電層可包括具有低介電常數(k值)的一個或多個低介電常數介電層。舉例來說,介電層中的低介電常數介電材料的k值可低於約3.0或低於約2.5。
封裝構件105的俯視圖大小大於晶粒106及108的俯視圖大小。晶粒106及晶粒108可藉由倒裝晶片接合而接合到封裝構件105,其中使用多個電連接件109(例如金屬凸塊、焊料球等)將晶粒106及晶粒108接合到封裝構件105。
CoW封裝103貼合到第一基底110的第一側。在一些實施例中,CoW封裝103接合到第一基底110的頂表面110a。CoW封裝103可藉由多個電連接件112電耦合到及機械耦合到第一基底110,所述多個電連接件112可為導電凸塊、微凸塊、金屬柱等。
第一基底110可為陶瓷基底或有機基底。有機基底可為層壓式有機基底或積層式有機基底(build-up organic substrate)。第一基底110更包括導電特徵,例如導電層及導通孔。導電層及導通孔可分別由任何合適的材料(例如銅箔及銅/銅合金)形成。也可使用其他導電材料。導電特徵可用於熱傳導目的,以使熱量遠離晶粒106及108的中心消散。在一些實施例中,導電特徵也可用於電連接,例如,做為第一基底110中的接地、電源、和/或訊號輸入及輸出層。在其他實施例中,一些或所有導電特徵可能不會提供電功能且可被稱為虛擬特徵。
在一些實施例中,第一基底110包括芯體及設置在芯體的前側及背側上的積層(build-up layers)。穿孔可從芯體的前側延伸且電連接到芯體的背側。芯體可包括導電層(例如,銅箔)。芯體可包括兩個、四個、六個、八個、或更多個導電層。儘管附加的導電層可增加第一基底110的整體熱導率,但導電層的數目可依據半導體結構的佈局設計(例如,電路設計)而定。積層包括內連線結構,所述內連線結構具有藉由導通孔電連接的圖案化導電層。在各種實施例中,導電特徵(導電層及導通孔)可用於功能性電性目的,例如電源、接地、和/或訊號IO層。在各種其他實施例中,導電特徵可包括用於增加熱導率的虛擬特徵。在一些實施例中,第一基底110包括主動元件、被動元件等。在一些實施例中,依據佈局設計而定,第一基底110包括不同數目的芯體層及積層。
在第一基底110與CoW封裝103之間可形成有環繞第一電連接件112的底部填充材料118。底部填充材料118也可延伸且環繞CoW封裝103。
在圖2A及圖2B中,在一些實施例中,CoWoS結構102包括沉積在第一基底110的頂表面110a上的粘合劑122。在一些實施例中,CoWoS結構102更包括沉積在CoW封裝103之上的熱介面材料(thermal interface material,TIM)124。粘合劑122可為環氧樹脂、矽樹脂、膠水等。粘合劑122可具有優於TIM 124的粘合能力。粘合劑122可被定位成使得散熱特徵(例如,圖3A中所示的蓋126)貼合在CoWoS結構102周圍。因此,在一些實施例中,粘合劑122可被設置成圍繞CoW封裝103的週邊或者甚至包圍CoW封裝103。
TIM 124可為具有良好熱導性的聚合物,以利於散熱特徵(例如,圖3A中所示的蓋126)散熱。在一些實施例中,TIM 124可包含具有導熱填料的聚合物。導熱填料可將TIM 124的有效熱導率從約10 W/m·K增加到約50 W/m·K或更高。適用的導熱填料材料可包括氧化鋁、氮化硼、氮化鋁、鋁、銅、銀、銦、其組合等。在其他實施例中,TIM 124可包含其他材料,例如包括銀、銦膏等的金屬系材料或焊料系材料。在再一些實施例中,TIM 124可包含膜系材料或片系材料(sheet-based material),例如包括合成碳納米管(carbon nanotube,CNT)的片系材料或具有垂直取向的石墨填料的導熱片。
儘管TIM 124被示出為在CoW封裝103的包封體120、晶粒106及晶粒108之上延伸的連續的TIM,但在一些實施例中,TIM 124可為不連續的。舉例來說,在相鄰的晶粒(例如,晶粒106和/或晶粒108)之間的TIM 124中可具有空隙,以減少晶粒之間的側向熱交互作用。在一些實施例中,TIM 124可在粘合劑122之後沉積;然而,TIM 124也可在粘合劑122之前沉積。
在圖3A及圖3B中,將蓋126貼合到CoWoS結構102。蓋126可被貼合以保護CoWoS結構102,以將CoWoS結構102產生的熱量擴散到更大的面積,從而消散CoWoS結構102的熱量。蓋126可由具有高熱導性的材料(例如鋼、不銹鋼、銅、鋁、其組合等)形成。在一些實施例中,蓋126可為塗覆有另一種金屬(例如金)的金屬。舉例來說,蓋126可由熱導率從約100 W/m·K到約400 W/m·K(例如約400 W/m·K)的材料形成。如果蓋126的熱導率低於100 W/m·K,則無法提供足夠的散熱。如果蓋126的熱導率大於400 W/m·K,則用於蓋126的材料成本太高。
蓋126覆蓋且環繞CoW封裝103及第一基底110的部分。在一些實施例中,蓋126是單一的連續的材料。在其他實施例中,蓋126可包括可為相同或不同材料的多個部件。
蓋126包括帽部128、環形部130及多個外懸部132。帽部128覆蓋CoW封裝103及第一基底110。帽部128的俯視圖面積大於CoW封裝103的俯視圖面積。在一些實施例中,蓋126的帽部128與第一基底110具有實質上相同的形狀及實質上相同的俯視圖面積。在一些實施例中,帽部128的底表面128b與位於CoW封裝103之上的TIM 124實體接觸。因此,帽部128使得熱量能夠從TIM 124遠離CoW封裝103而消散。在一些實施例中,帽部128的底表面128b與CoW封裝103的晶粒106及晶粒108直接實體接觸。因此,帽部128使得熱量能夠遠離CoW封裝103而消散。
蓋126的環形部130從帽部128的底表面128b朝第一基底110延伸。環形部130的俯視圖大小大於CoW封裝103的俯視圖大小。在俯視圖中,環形部130可包圍CoW封裝103。環形部130、帽部128及第一基底110界定空間,且CoW封裝103容納在所述空間中。
在一些實施例中,環形部130的俯視圖大小與第一基底110的俯視圖大小(長度及寬度)相同。環形部130具有內側壁130s1及外側壁130s2。在一些實施例中,環形部130的內側壁130s1及外側壁130s2是直的,但並不僅限於此。內側壁130s1與底部填充材料118間隔開。換句話說,在CoW封裝103、底部填充材料118及環形部130之間具有空隙AG。環形部130的外側壁130s2可與第一基底110的側壁110s對齊。在一些實施例中,環形部130的外側壁130s2與第一基底110的側壁110s實質上共面。
在一些實施例中,環形部130的俯視圖大小大於第一基底110的俯視圖大小,如圖7A及圖7B中所示。環形部130的外側壁130s2可不與第一基底110的側壁110s對齊。環形部130的外側壁130s2可在側向上延伸超過第一基底110的側壁110s。
環形部130的底表面130b的水平高度可相同於、高於、或低於CoW封裝103的底表面103b的水平高度。環形部130的底表面130b的面積Ar 對第一基底110的面積Ap 的比率介於從約10%到約50%的範圍內。如果面積Ar 對面積Ap 的比率大於50%,則環形部130將佔據第一基底110過大的面積。
蓋126的外懸部132位於帽部128的轉角側壁128s處,且延伸以覆蓋環形部130的轉角側壁130s3及第一基底110的轉角側壁110s1。在一些實施例中,蓋126具有四個外懸部132,但外懸部132的數目可依據半導體結構的佈局設計(例如,電路設計)而定。在一些實施例中,外懸部132與環形部130的轉角側壁130s3及第一基底110的轉角側壁110s1實質上共形。外懸部132在俯視圖中具有例如L形形狀,但本揭露並不僅限於此。外懸部132可均為實質上相同的形狀或者可為不同的形狀。
外懸部132具有頂表面132a。外懸部132的頂表面132a的水平高度可高於第一基底110的頂表面110a的水平高度,而外懸部132的頂表面132a的水平高度可低於、等於或高於帽部128的頂表面128a的水平高度。在一些實施例中,外懸部132的頂表面132a與帽部128的頂表面128a實質上共面。
外懸部132具有內側壁132s1及外側壁132s2。外懸部132的內側壁132s1及外側壁132s2可為例如直的、傾斜的或彎曲的,但並不僅限於此。在一些實施例中,內側壁132s1與第一基底110的轉角側壁110s1接觸。在一些實施例中,外懸部132的內側壁132s1藉由間隙與第一基底110的轉角側壁110s1隔開(如圖7A及圖7B中所示)。
外懸部132具有沿第一方向D1的長度Lo1 及沿第二方向D2的長度Lo2 。外懸部132的長度Lo1 可相同或不同。外懸部132的長度Lo2 可相同或不同。長度Lo1 與長度Lo2 可相同或不同。長度Lo1 小於環形部130沿第一方向D1的長度Lr1 ,且長度Lo2 小於環形部130沿第二方向D2的長度Lr2 。在一些實施例中,長度Lo1 對長度Lr1 的比率介於從約60%到約5%的範圍內;且長度Lo2 對長度Lr2 的比率介於從約100%到約5%的範圍內。如果長度Lo1 對長度Lr1 的比率和/或長度Lo2 對長度Lr2 的比率大於60%,則所述製程難以實行球柵陣列(ball grid array,BGA)重工。如果長度Lo1 對長度Lr1 的比率和/或長度Lo2 對長度Lr2 的比率低於5%,則外懸部132不能提供足夠的機械強度。在一些實施例中,環形部130的長度Lr1 與環形部130的長度Lr2 不同,而外懸部132的長度Lo1 與長度Lo2 相同。
外懸部132沿第一方向D1具有厚度To1 ,且沿第二方向D2具有厚度To2 。外懸部132的厚度To1 可相同或不同。外懸部132的厚度To2 可相同或不同。厚度To1 與厚度To2 可相同或不同。厚度To1 小於環形部130沿第一方向D1的厚度Tr1 ,且厚度To2 小於環形部130沿第二方向D2的厚度Tr2 。厚度To1 對厚度Tr1 的比率介於例如從約100%到約10%的範圍內;且厚度To2 對厚度Tr2 的比率介於例如從約100%到約10%的範圍內。在一些實施例中,厚度To1 及To2 分別介於從200 μm到5000 μm的範圍內。如果外懸部132的厚度To1 或To2 小於200 μm,則粘合劑136的面積(如圖5A中所示)不足,從而導致粘合強度差。如果外懸部132的厚度To1 或To2 大於5000 μm,則外懸部132將佔據第二基底104過大的面積,且增加重量。
相鄰的外懸部132沿第一方向D1隔開距離d1。距離d2沿第二方向D2將相鄰的外懸部132隔開。距離d1及d2一般來說大於零。在一些實施例中,距離d1對環形部130的長度Lr1 的比率介於從大於0%到約95%的範圍內,且距離d2對環形部130的長度Lr2 的比率介於從大於0%到約95%的範圍內。如果距離d2對長度Lr2 的比率大於95%,則粘合劑136的面積(如圖5A中所示)太小,從而導致粘合強度差。
外懸部132的底表面132b的水平高度低於第一基底110的底表面110b的水平高度。外懸部132的底表面132b可具有相同的面積或不同的面積Ao 。每個外懸部132的底表面132b的面積Ao 小於環形部130的底表面130b的面積Ar 。在一些實施例中,面積Ao 對面積Ar 的比率介於從約0.1%到約20%的範圍內。如果面積Ao 對面積Ar 的比率低於0.1%,則粘合強度可能不足。如果面積Ao 對面積Ar 的比率大於20%,則蓋126的過大重量及面積可增加成本且在下伏的基底上產生過度的應變。
環形部130的底表面130b藉由粘合劑122粘合到第一基底110。粘合劑122具有比TIM 124大的粘合能力但比TIM 124低的熱導率。因此,在一些實施例中,粘合劑122設置在CoW封裝103的週邊周圍以及蓋126與第一基底110之間,以將蓋126的環形部130的底表面130b粘合到第一基底110的頂表面110a。
在一些實施例中,粘合劑122設置在環形部130的底表面130b下方。在替代實施例中,粘合劑122進一步延伸到環形部130的內側壁130s1的下部部分,同時粘合劑122與底部填充材料118間隔開。粘合劑122的面積可等於、小於或大於環形部130的底表面130b的面積。粘合劑122在俯視圖中具有例如環形形狀,但並不僅限於此。
在替代實施例中,半導體結構100’的粘合劑122包括第一部分122a及第二部分122b(如圖7A及圖7B中所示)。第一部分122a設置在CoW封裝103的週邊周圍以及蓋126與第一基底110之間,以將蓋126的環形部130粘合到第一基底110的頂表面110a。第二部分122b設置在第一基底110的轉角側壁110s1與外懸部132的內側壁132s1之間的間隙中,使得外懸部132藉由第二部分122b粘合到第一基底110的轉角側壁110s1。在一些實施例中,第二部分122b連接到第一部分122a(如圖7A中所示)。在替代實施例中,第二部分122b與第一部分122a間隔開(如圖7B中所示)。
在圖3A及圖3B中,多個電連接件116接合到第一基底110的底表面110b。所述多個電連接件116可為導電凸塊、微凸塊、金屬柱等。第一基底110的轉角下方的電連接件116在側向上與外懸部132相鄰且與外懸部132間隔開。
在圖4A及圖4B中,第二基底104貼合到與第一基底110的第一側相對的第二側。CoWoS結構102的第一基底110藉由回焊製程接合到第二基底104的頂表面104a。第一基底110可藉由電連接件116電耦合及機械耦合到第二基底104。第二基底104可為封裝基底,所述封裝基底可為印刷電路板(PCB)等。第二基底104可包括一個或多個介電層及導電特徵,例如導電線及導通孔。在一些實施例中,第二基底104可包括穿孔、主動元件、被動元件等。第二基底104可更包括形成在第二基底104的上表面及下表面處的導電焊盤。
在圖4A、圖5A及圖5B中,向第二基底104的頂表面104a與外懸部132的底表面132b之間的空間S中分配粘合劑136。空間S的高度Hs 介於從約10 μm到約300 μm的範圍內。如果空間S的高度小於10 μm,則粘合劑136難以流入到空間S中。如果空間S的高度Hs 大於300 μm,則對於粘合劑136的流動而言毛細效應(capillary effect)太弱。在一些實施例中,粘合劑136與電連接件116間隔開。粘合劑136可為環氧樹脂、矽樹脂、膠水等。粘合劑136可具有優於TIM 124的粘合能力。粘合劑136與粘合劑122可具有相同的材料或不同的材料。粘合劑136可具有從約10 GPa到約1 MPa的楊氏模量(Young’s modulus)。粘合劑136可具有從約10 μm到約300 μm的厚度。
外懸部132的底表面132b藉由粘合劑136粘合到第二基底104的頂表面104a。每個粘合劑136的俯視圖面積Aa3 可等於、相同於、或大於對應的外懸部132的面積Ao1 。舉例來說,每個粘合劑136的俯視圖面積Aa3 可小於粘合劑122的俯視圖面積Aa 。每個粘合劑136的面積Aa3 及粘合劑122的面積Aa 分別與外懸部132的底表面132b的面積Ao 及環形部130的底表面130b的面積Ar 相關。在一些實施例中,俯視圖面積Aa3 對俯視圖面積Aa 的比率介於例如從約0.1%到約20%的範圍內。如果面積Aa3 對面積Aa 的比率低於0.1%,則粘合強度可能不足。如果面積Aa3 對面積Aa 的比率大於20%,則蓋126的過大重量及面積可增加成本且在下伏的基底上產生過度的應變。
一旦將蓋126與第二基底104粘合,便可藉由向粘合劑122及136以及TIM 124加熱而使粘合劑122及136以及TIM 124固化。在一些實施例中,可藉由將CoWoS結構102放置在固化爐中而使粘合劑122及136以及TIM 124固化。在固化製程之後,粘合劑122可具有從200 μm到約20 μm的厚度T1 ,且每個粘合劑136可具有小於約300 μm的厚度T2 ,且TIM 124可具有小於約200 μm的厚度T3
在圖5A、圖5B及圖6中,貼合到第二基底104的蓋126的外懸部132可用於限制電連接件116的偏離,且可有助於防止CoWoS結構102的翹曲以及CoWoS結構102與第二基底104之間的冷接縫。另外,蓋126的外懸部132被設置成環繞CoWoS結構102的轉角側壁、可保護電連接件116且減少由外部應力導致的電連接件116中的裂紋。CoWoS結構102的翹曲及電連接件116的裂紋的減少有助於形成更可靠的半導體結構。
圖8A示出依據各種實施例的半導體結構200的剖視圖。圖8B示出圖8A的半導體結構200的俯視圖。
在圖8A及圖8B中,半導體結構200類似於圖5A及圖5B中所示的半導體結構100,且相同的參考編號表示相同的構件。半導體結構200的蓋226包括帽部228、環形部230、多個外懸部232及多個突出部234。帽部228、環形部230及所述多個外懸部232的構造及材料類似於帽部128、環形部130及所述多個外懸部132的構造及材料,且不再進行重複。
突出部234從外懸部232的外側壁232s2朝第二基底104的邊緣延伸。突出部234的高度Hp 小於外懸部232的高度Ho 。突出部234的高度Hp 被界定成從突出部234的頂表面234a到底表面234b的距離。外懸部232的高度Ho 被界定成從帽部228的底表面228b到外懸部232的底表面232b的距離。高度Hp 對高度Ho 的比率介於例如從約10%到約100%的範圍內。如果高度Hp 對高度Ho 的比率低於10%,則突出部234不會提供足夠的支撐。
在一些實施例中,突出部234與外懸部232共形。舉例來說,突出部234在俯視圖中可具有L形形狀。突出部234與外懸部232的組合在俯視圖及剖視圖中可具有L形形狀,但本揭露並不僅限於此。
在一些實施例中,突出部234的底表面234b與外懸部232的底表面232b的組合面積Apo 對環形部230的面積Ar2 的比率介於從約1%到約60%的範圍內。在其他一些實施例中,突出部234的底表面234b與外懸部232的底表面232b的組合面積Apo 對環形部230的面積Ar2 的比率介於從約1%到約20%的範圍內。如果面積Apo 對面積Ar2 的比率低於1%,則粘合強度可能不足。如果面積Apo 對面積Ar2 的比率大於20%,則蓋126的過大重量及面積將導致成本增加且在下伏的基底上產生過度的應變。
在外懸部232的底表面232b及突出部234的底表面234b下方設置有粘合劑236,以將外懸部232及突出部234粘合到第二基底104的頂表面104a。因此,由於突出部234提供了附加的底表面234b,因此突出部234可增加蓋126到CoWoS結構102的粘合力。
每個粘合劑236的俯視圖面積Aa3 可等於、相同於、或大於突出部234的底表面234b與外懸部232的底表面232b的組合面積Apo 。舉例來說,每個粘合劑236的俯視圖面積Aa3 可小於環形部230的底表面230b下方的粘合劑222的俯視圖面積Aa 。在一些實施例中,俯視圖面積Aa3 對俯視圖面積Aa 的比率介於從約1%到約30%的範圍內。在其他一些實施例中,俯視圖面積Aa3 對俯視圖面積Aa 的比率介於從約1%到約10%的範圍內。如果俯視圖面積Aa3 對俯視圖面積Aa 的比率低於1%,則粘合強度可能不足。如果俯視圖面積Aa3 對俯視圖面積Aa 的比率大於10%,則蓋226的過大重量及面積可增加成本且在下伏的基底上產生過度的應變。
圖9A示出依據各種實施例的半導體結構300的剖視圖。圖9B示出圖9A的半導體結構300的俯視圖。
在圖9A及圖9B中,半導體結構300類似於圖5A及圖5B中所示的半導體100,且相同的參考編號表示相同的構件。半導體結構300的蓋326包括帽部328、環形部330及多個外懸部332。環形部330及所述多個外懸部332的構造及材料類似於環形部130及所述多個外懸部332的構造及材料,且不再進行重複。帽部328的構造類似於圖5A及圖5B中所示的帽部128的構造,但帽部328中具有開口329。開口329的俯視圖大小可小於、等於或大於CoW封裝103的俯視圖大小。帽部328的頂表面328a的水平高度可低於、等於或高於CoW封裝103的頂表面103a的水平高度。帽部328的底表面328b的水平高度可低於、等於或高於CoW封裝103的頂表面103a的水平高度。在一些實施例中,開口329暴露出CoW封裝103的頂表面103a且與環形部330和CoW封裝103之間的間隙G連通,從而改善CoWoS結構102的散熱。
圖10A示出依據各種實施例的半導體結構400的剖視圖。圖10B示出圖10A的半導體結構400的俯視圖。
在圖10A及圖10B中,半導體結構400類似於圖5A及5B中所示的半導體100,且相同的參考編號指代相同的構件。半導體結構400的蓋426包括環形部430及多個外懸部432,但不包括環形部430上的帽部。環形部430及所述多個外懸部432的材料及構造類似於環形部130及所述多個外懸部132的材料及構造,且不再進行重複。蓋426與蓋126之間的構造差異將在下面詳細闡述。
外懸部432定位在外懸部430的轉角側壁430s3及第一基底110的轉角側壁110s1處。外懸部432具有頂表面432a。外懸部432的頂表面432a的水平高度可高於第一基底110的頂表面110a的水平高度。外懸部432的頂表面432a的水平高度可低於、等於、或高於環形部430的表面430a的水平高度。在一些實施例中,外懸部432的頂表面432a與環形部430的頂表面430a可實質上共面。
蓋426的環形部430設置在第一基底110之上且可包圍CoW封裝103。環形部430的頂表面430a的水平高度可等於或高於CoW封裝103的頂表面103a的水平高度。環形部430暴露出CoW封裝103的頂表面103a及第一基底110的頂表面110a的一部分,從而改善CoWoS結構102的散熱。
圖11是示出依據一些實施例的製作半導體結構(舉例來說,例如,圖5A中所示的半導體結構100、100’、300或400)的方法的流程圖。所述方法從製程1101開始,其中如上面參照圖1A所述,將封裝(舉例來說,例如,圖1A中所示的封裝103)貼合到第一基底(舉例來說,例如,圖1A中所示的第一基底110)的第一側。在製程1102中,如上面參照圖1A所述,提供蓋(舉例來說,例如,圖3A、圖8A、圖9A或圖10A中所示的蓋126、226、326或426)。蓋包括環形部(舉例來說,例如圖3A、圖8A或圖9A中所示的環形部130、230或330)及多個外懸部(舉例來說,例如,圖3A、圖9A或圖10A中所示的外懸部132、332或432)。在製程1103中,如上面參照圖3A、圖7A及圖7B所述,利用第一粘合劑(舉例來說,例如,圖3A、圖7A或圖7B中所示的粘合劑122、122a、222)將環形部的底表面貼合到第一基底的第一側。在製程1104中,如上面參照圖3A及圖4A所述,將第二基底(舉例來說,例如,圖3A及圖4A中所示的第二基底104)藉由多個電連接件(舉例來說,例如,圖3A及圖4A中所示的電連接件116)貼合到第一基底的與第一側相對的第二側。在製程1105中,如上參照圖5A所述,利用第二粘合劑(舉例來說,例如,圖5A中所示的粘合劑136)將蓋的所述多個外懸部的底表面貼合到第二基底。
本揭露的實施例提供包括蓋的半導體結構。蓋具有多個外懸部,以限定電連接件在CoWoS結構與板之間的偏離,且防止CoWoS結構的翹曲以及CoWoS結構與板之間的冷接縫。另外,外懸部環繞CoWoS結構的轉角側壁可減少由外部應力導致的電連接件中的裂紋。CoWoS結構的翹曲及電連接件的裂紋的減少有助於形成更可靠的半導體結構。
依據實施例,一種半導體結構包括:第一基底,包括第一側及與所述第一側相對的第二側;封裝,貼合到所述第一基底的所述第一側;第二基底,貼合到所述第一基底的所述第二側;蓋,連接到所述第一基底及所述第二基底,所述蓋包括:環形部,位於所述第一基底的所述第一側之上,其中所述環形部及所述第一基底界定空間且所述封裝容納在所述空間中;以及多個外懸部,從所述環形部的轉角側壁朝所述第二基底延伸,以覆蓋所述第一基底的轉角側壁。
依據另一實施例,一種半導體結構包括:第一基底,包括第一側及與所述第一側相對的第二側;封裝,貼合到所述第一基底的所述第一側;第二基底,貼合到所述第一基底的所述第二側;蓋,連接到所述第一基底及所述第二基底,所述蓋包括:帽部;環形部,從所述帽部的底表面朝所述第一基底延伸,其中所述環形部、所述帽部及所述第一基底界定空間,且所述封裝容納在所述空間中;以及多個外懸部,從所述帽部的轉角側壁朝所述第二基底延伸,以覆蓋所述第一基底的轉角側壁。
依據再一實施例,一種製作半導體結構的方法包括:將封裝貼合到第一基底的第一側;提供蓋,其中所述蓋包括環形部及多個外懸部;將所述蓋的所述環形部的底表面藉由第一粘合劑貼合到所述第一基底的所述第一側;將所述第一基底的與所述第一側相對的第二側藉由多個電連接件貼合到第二基底;以及將所述蓋的所述多個外懸部的底表面藉由第二粘合劑貼合到所述第二基底,所述多個外懸部從所述環形部的轉角側壁朝所述第二基底延伸,以覆蓋所述第一基底的轉角側壁。
以上概述了若干實施例的特徵,以使所屬領域中的技術人員可更好地理解本揭露的各個方面。所屬領域中的技術人員應理解,他們可容易地使用本揭露做為設計或修改其他製程及結構的基礎來施行與本文中所介紹的實施例相同的目的和/或實現與本文中所介紹的實施例相同的優點。所屬領域中的技術人員還應認識到,這些等效構造並不背離本揭露的精神及範圍,而且他們可在不背離本揭露的精神及範圍的條件下在本文中作出各種改變、代替及變更。
100、100’、200、300、400:半導體結構 102:基底上晶圓上晶片(CoWoS)結構 103:封裝/CoW封裝 103a、104a、110a、128a、132a、234a、328a、432a:頂表面 103b、110b、128b、130b、132b、228b、230b、232b、234b、328b:底表面 104:第二基底 105:封裝構件 106、108:晶粒 109、112、116:電連接件 110:第一基底 110s:側壁 110s1、128s、130s3、430s3:轉角側壁 118:底部填充材料 120:包封體 122、136、222、236:粘合劑 122a:第一部分 122b:第二部分 124:熱介面材料(TIM) 126、226、326、426:蓋 128、228、328:帽部 130:環形部 130s1、132s1:內側壁 130s2、132s2、232s2:外側壁 132:外懸部/外懸部分 230、330、430:環形部 232、332、432:外懸部 234:突出部 329:開口 430a:表面 1101、1102、1103、1104、1105:製程 AG:空隙 D1:第一方向 D2:第二方向 d1、d2:距離 G:間隙 Ho 、Hs 、Hp :高度 Lo1 、Lo2 、Lr1 、Lr2 :長度 S:空間 T1 、T2 、T3 、To1 、To2 、Tr1 、Tr2 :厚度
結合附圖閱讀以下詳細說明,會最好地理解本揭露的各個方面。應注意,依據本行業中的標準慣例,各種特徵並非按比例繪製。事實上,為使論述清晰起見,可任意增大或減小各種特徵的尺寸。 圖1A到圖5A示出依據各種實施例的製造半導體結構的中間階段的剖視圖。 圖1B到圖5B示出製造圖1A到圖5A的半導體結構的中間階段的俯視圖。 圖6示出圖5A的半導體結構的透視圖。 圖7A、圖7B、圖8A、圖9A及圖10A示出依據各種實施例的半導體結構的剖視圖。 圖8B到圖10B示出圖8A到圖10A的半導體結構的俯視圖。 圖11是示出依據一些實施例的製作半導體結構的方法的流程圖。
100:半導體結構
102:基底上晶圓上晶片(CoWoS)結構
104:第二基底
110:第一基底
126:蓋
128:帽部
130:環形部
132:外懸部/外懸部分

Claims (20)

  1. 一種半導體結構,包括: 第一基底,包括第一側及與所述第一側相對的第二側; 封裝,貼合到所述第一基底的所述第一側; 第二基底,貼合到所述第一基底的所述第二側;以及 蓋,連接到所述第一基底及所述第二基底,其中所述蓋包括: 環形部,位於所述第一基底的所述第一側之上,其中所述環形部及所述第一基底界定空間且所述封裝容納在所述空間中;以及 多個外懸部,從所述環形部的轉角側壁朝所述第二基底延伸,以覆蓋所述第一基底的轉角側壁。
  2. 如請求項1所述的所述的半導體結構,其中所述多個外懸部與所述第一基底的所述轉角側壁實質上共形。
  3. 如請求項2所述的半導體結構,其中所述多個外懸部具有L形形狀。
  4. 如請求項1所述的半導體結構,其中所述多個外懸部中的一者具有底表面,且所述底表面的面積小於所述環形部的底表面的面積。
  5. 如請求項1所述的半導體結構,更包括多個電連接件,所述多個電連接件將所述第一基底的所述第二側連接到所述第二基底,其中所述多個外懸部在側向上位於所述多個電連接件的一部分的旁邊。
  6. 如請求項5所述的半導體結構,更包括: 第一粘合劑,將所述蓋的所述環形部連接到所述第一基底;以及 多個第二粘合劑,將所述蓋的所述多個外懸部連接到所述第二基底。
  7. 如請求項6所述的半導體結構,其中所述多個電連接件與所述多個第二粘合劑間隔開。
  8. 如請求項6所述的半導體結構,其中所述第一粘合劑還將所述多個外懸部的內側壁連接到所述第一基底的轉角側壁。
  9. 一種半導體結構,包括: 第一基底,包括第一側及與所述第一側相對的第二側; 封裝,貼合到所述第一基底的所述第一側; 第二基底,貼合到所述第一基底的所述第二側;以及 蓋,連接到所述第一基底及所述第二基底,所述蓋包括: 帽部; 環形部,從所述帽部的底表面朝所述第一基底延伸,其中所述環形部、所述帽部及所述第一基底界定空間,且所述封裝容納在所述空間中;以及 多個外懸部,從所述帽部的轉角側壁朝所述第二基底延伸,以覆蓋所述第一基底的轉角側壁。
  10. 如請求項9所述的半導體結構,其中所述帽部覆蓋所述封裝的頂表面,且在所述封裝、所述環形部及所述帽部之間具有空隙。
  11. 如請求項9所述的半導體結構,其中所述帽部具有開口,所述開口暴露出所述封裝的頂表面。
  12. 如請求項9所述的半導體結構,其中所述蓋更包括多個突出部,所述多個突出部從所述多個外懸部的外側壁朝所述第二基底的邊緣延伸。
  13. 如請求項12所述的半導體結構,更包括: 第一粘合劑,將所述蓋的所述環形部連接到所述第一基底;以及 多個第二粘合劑,將所述蓋的所述多個外懸部連接到所述第二基底。
  14. 如請求項13所述的半導體結構,其中所述多個突出部還通過所述多個第二粘合劑連接到所述第二基底。
  15. 如請求項9所述的半導體結構,其中所述多個外懸部與所述第一基底的所述轉角側壁實質上共形。
  16. 如請求項9所述的半導體結構,更包括多個電連接件,所述多個電連接件將所述第一基底的所述第二側連接到所述第二基底,其中所述多個外懸部在側向上位於所述多個電連接件的一部分旁邊。
  17. 如請求項9所述的半導體結構,其中所述封裝包括: 中介層基底; 第一晶粒,接合到所述中介層; 第二晶粒,與所述第一晶粒相鄰且接合到所述中介層,其中所述第一晶粒與所述第二晶粒具有不同的功耗;以及 包封體,包封所述第一晶粒及所述第二晶粒。
  18. 一種製作半導體結構的方法,包括: 將封裝貼合到第一基底的第一側; 提供蓋,其中所述蓋包括環形部及多個外懸部; 將所述蓋的所述環形部的底表面藉由第一粘合劑貼合到所述第一基底的所述第一側; 將所述第一基底的第二側藉由多個電連接件貼合到第二基底,所述第一基底的所述第二側與所述第一側相對;以及 將所述蓋的所述多個外懸部的底表面藉由第二粘合劑貼合到所述第二基底,所述多個外懸部從所述環形部的轉角側壁朝所述第二基底延伸,以覆蓋所述第一基底的轉角側壁。
  19. 如請求項18所述的方法,更包括:在所述將所述第一基底的所述第二側貼合到所述第二基底之前且在貼合所述蓋的所述環形部的所述底表面之後,將所述多個電連接件接合在所述第一基底的所述第二側上。
  20. 如請求項18所述的方法,更包括: 將所述蓋的所述多個外懸部的側壁藉由所述第一粘合劑貼合到所述第一基底的所述轉角側壁。
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US12068260B2 (en) 2021-08-31 2024-08-20 Taiwan Semiconductor Manufacturing Company, Ltd. Semiconductor die package with ring structure and method for forming the same

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