TWI229918B - Method of forming an inter-metal dielectric layer in an interconnect structure - Google Patents

Method of forming an inter-metal dielectric layer in an interconnect structure Download PDF

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TWI229918B
TWI229918B TW093104898A TW93104898A TWI229918B TW I229918 B TWI229918 B TW I229918B TW 093104898 A TW093104898 A TW 093104898A TW 93104898 A TW93104898 A TW 93104898A TW I229918 B TWI229918 B TW I229918B
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interlayer dielectric
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TW200419716A (en
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Yi-Lung Cheng
Ming-Hwa Yoo
Szu-An Wu
Ying-Lung Wang
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Taiwan Semiconductor Mfg
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Description

發明所屬之技術領域 本發明係有關於半導體製程 介電奮叙f 1 , v V, V 符別有關於一 电书數(low k)之金屬層γ介雷爲从^ $ 9间;丨電層的半導體製程 先前技術 隨 小’晶 導線之 遞的RC 為目旬Γ 金屬銅 電子遷 屬鋁的 (A/d) 幾何改 低介電 勢。可 著半導體產品的積集化,半慕― μ _ . ^ ^ Α 千^體凡件尺寸日益縮 片運作速度除了取決於元件操 訊號傳輸速度也扮演重要角岛 二& 延遲UC delay),色。而4 了降低訊號傳 一有低電阻和低電容的材料則成 半導體製程技術的開發重。A 、 』知里^ 為了降低電阻部份, 於具備咼熔點,低電阻係數(〜l 7mW —cm)及高抗 移(Electron migration)的能力,因而成為取代金 金屬材質。另一方面,在低電容部份,電容c = e 而由於製程上的限制,因此,業界通常不考慮以 變(例如··改變導線面積)來降低寄生電容。目前, 常數(low k)材質的研究,就成為主要的發展趨 分為無機類及有機類聚合物
在多重金屬内連線結構中的層間介電層(Inter一metal dielectric layer,以下簡稱IMD),其本要求為高可靠 度、低應力、製程簡單化、不易吸水以及易於與金屬内連 線間作整合。在先前技術中,介電層材料多以電聚輔助化 學氣相沉積法(PECVD)沉積Si02,其介電常數約為3.9〜4· 2。另一些常用於介電層的材料,則以二氧化矽基 (Si〇2-based)、矽氧烧基(Siloxane-based)、石夕化氮基
〇503-8966TWf(Nl) : TSMC2002-0587;peggy.ptd 第5頁 122991 五、發明說明(2) (SlN)或陶瓷類(ceramic-like)材質為主。缺而 f 料的介電常數大多高於3 〇以卜二為 …、 上述材 後,已有a ^ 在邁入深次微米製程 後已有命夕低介電常數(小於3. 9)的材質被發展 此類材料主要分為無機類與有機類兩種Λ而直”穑 方式主由化學氣相沉積(CVD)或旋塗式塗佈法、儿、 材7:八:。在無機類低介電材質方面,車交常見的 .rr •工右,還可以改善沈積薄膜時的填溝能 县二:二二§)。然而,含氟的矽氧化物中的氟含量不 二,,谷 V致吸水的傾向,而呈現較不穩定的特性, 使内連線結構的可靠性(ReliabiUty)不易控制。
另外諸如像HSQ (Hydrogen silesquioxane)和MSQ (MethylSeqUloxane)等聚合物,其最小介電常數值約為2· · 6〜2:8,可採用旋塗式玻璃法(Spin —〇n gUss,簡稱s〇g) 進行塗佈。由於採用S〇G製程,填溝能力良好,因此此類 材料也逐漸被廣泛使用中。 然而此類低介電常數材料與製程技術的搭配,一般需 要不斷的調整與驗證,以達到量產的目的。如美國專利第 6051321號中,提出一種藉由電漿或光子輔助CVD形成IMD 層的方法。藉由調整其操作條件,可以得到介電常數介於| 2 · 0至2 · 6之間的低介電常數層間界電層,主要材料為特定 的矽氧烷(si loxanes)與含氟之芳香類化合物 (F c ο n t a i n i n g a r 〇 m a t i c c 〇 m ρ 〇 u n d s )。 又如美國專利第5 8 5 8 8 6 9號中,提出一種以異方性電
〇5〇3-8966TWf(Nl) : TSMC2002-0587;peggy.ptd
漿與低介電火 --- 3構上形層間介電層的方法。其主要在金 J 4 ’接著沈積 二二氣ϋ物,在金屬頂端較厚而側壁 製程露出該金1: !常數材料於其表面,並以平坦化 作為-層間介電‘之頂#。最後,續覆蓋-摻氟氧化物層 發明内容 方法與藉其ψ個目的在於提供一種低介電常數層的形成 電層。…《内連線結構,以形成穩定的金層層間介 根據本發明 的方法,適用协二,、一種形成金屬層間介電層(IMD) 嵌製程,传包乂二夕重金屬鑲嵌内連線結構,特別為銅鑲 底,其中ίϊΐΐ:!步驟。首先,提供一半導體基底基· 漿化學氣相、=件或導電元件。接著,以高密度電 兩密度電聚内襯氧化物層與一高式將(in-situ)形成一 序覆蓋於半導體基底表面作;二雷:低介電常數層依 介電層上定義並形成鑲嵌開口:m。接續於該層間 基底上填滿鑲嵌開口。 沈積一導電層於該 本發明更提供一種形成金屬層間 法,適用於一多重金屬内連線結構,幻曰(IMD)的方 結構,包含下列步驟:提供一基底,=別為鋁金屬内連線 或導電元件;於該基底上沈積二定蓋,、上具有半導體元件 元件或導電元件成電性接觸;、以;J義了導電層與該半導體 &向密度電漿化學氣
0503-8966TWf(Nl) : TSMC2002-0587;peggy.ptd 第7頁 1229918 五、發明說明(4) 相沈積法(HDP-CVD)臨場方式(in-situ)形成一高密度電漿 内襯氧化物層與一高密度電漿低介電常數層覆蓋於該基底 表面作為一層間介電層。 根據本發明,更提供一種内連線結構,包含:—半導 體基底,其中包含半導體元件或導電元件;一介電層,其 中具有一開口與該半導體元件或導電元件相通,該介電^ 包含一高密度電漿化學氣相沈積法(HDP-CVD)形成之—高0 密度電漿内襯氧化物層與一高密度電漿低介電常數層依# 覆蓋於該基底表面,其中該高密度電漿内襯氧化物層與該 高密度電漿低介電常數層係以臨場(in-si tu)方式依序生 成;以及,一導電層,用以填滿該介電層之該開口以形成 内連線。 / 在上述方法或内連線結構中,該基底可為一半導體晶 圓’其中該高密度低介電常數層為較佳者為高密度電聚$ 氟石夕玻璃層(fluorinated silicon glass,以下簡稱 HDP-FSG),厚度大體介於50 00-8 0 0 0埃之間,較佳者為 6 0 0 0埃,而該高密度電漿内襯氧化物層較佳者為高密”产電 焚含石夕氧化物層(silicon-rich oxide,以下簡稱 HDP-SR0),厚度大體介於25 0-50 0埃之間,較佳者為3〇〇 埃。而其中該高密度電漿含矽氧化物層在該晶圓之中間區 域之厚度較大,而邊緣厚度較小,以引導電荷流通,避免 後續電漿損害。 而較佳實施例中,高密度電漿氣相沈積(HDpcvD)的操 作條件如下: ”
^2^9918-- 五、發明說明(5)
HDP-SRO
操作壓力:4-6mT,較佳者為5mT 射頻RF(頂 / 側):10〇〇-έδ〇0/2000-3000Hz,較佳者兔 1 50 0/2 500Hz …、 偏壓射頻:0
Ar(頂/SiH4 ) :2- 8/3 0-50 sccm,較佳者為 5/40sccm
〇2 :3 5-4 2 sccm,較佳者為 38sccm HDP-FSG
操作壓力:4-6mT,較佳者為5mT 射頻(RF)(頂 / 側):50 0 - 1 20 0/3 0 0 0-380 0Hz,較佳者 為800/3400Hz 偏壓射頻:20 0 0-30 00Hz,較佳者 ΑΚ 頂/SlH4):2-8/3G-5Gsccm,tti::5/4()sccm 02 :35-42 seem,較佳者為38 seem
SiF4(頂 / 側):3-4/2 5-35sccm,較佳者為3. 5/3〇sccm 根據上述方法與藉其形成之内連線結構,本發明的優 點之一在於在一機台中,以臨場方式即可完成作為阻障層 之SRO層與低介電常數層之FSG ’可節省内連線製程步驟與 時間。 本發明的優點之二在於可以在晶圓上形成中間部分較 厚的HDP低介電常數層’如中間厚度較大的HDpsR〇層,使 得晶圓在進行後續的電漿製程時,不易受到電聚損3宝 (plasma damage) 〇 ' ° 本發明憂點之三在於由高冑度t聚形成之含石夕氧化
物層(HDPSRO),其可以有效防止上層的氟離子穿透, 在層間介電層與金屬層間形巧氣泡狀突起(bubble)或剝^ (peel ing),而影響内連線結構之電性。 各 “為了讓本發明之上述目的、特徵、及優點能更明顯 懂’以下配合所附圖式,作詳細說明如下·· 實施方式 貫施例一 以下藉由第1 A至1 E圖,詳細說明根據本發明之_種形 f金屬層間介電層(IMD)的方法,適用於一多重金屬鋼鎮/ 肷内連線結構。首先,參見第丨A圖,在一具有半導體元件 或導電元件110之半導體基底100,先形成一阻障層或蝕刻 阻擋層1 20,可為習知的氮化矽層。接著,以臨場方式 (in-si tu) ’以高密度電漿化學氣相沈積機台中(HDp-CVD) 依序形成一高密度電漿含矽氧化物層(HDp —SR〇)13〇,厚度 大體介於25 0 -50 0埃之間,較佳者為3〇〇埃。其操作壓力較 佳者為5mT ’射頻(RF)(頂/側)較佳者為1 5 0 0/2 5 0 0,而 Ar(頂/SiH4)較佳者為5/40sccm,而02較佳者為38sccm。而 在較佳情況中,在基底1 〇〇上中間區域的HDP-SR0層130厚 度大於周邊區域。 接著於同一高密度電漿機台中,依序形成高密度電漿 推氟石夕玻璃層(HDP-FSG)140,厚度大體介於50 0 0-8 0 0 0埃 之間’較佳者為6000埃,覆蓋於半導體基底1〇〇表面作為 層間介電層。一般而言,摻氟矽玻璃具有較低的介電常數
五、發明說明(7) 值,可降低内連線結構中的RC延遲。其操作壓力較佳者 5mT,射頻RF (頂/側)較佳者^80〇/34〇〇Hz,偏壓射頻較佳 者為25001^,而操作氣體包含:^(頂/以114)較佳者為5“〇 seem、02,較佳者為38sccm與SiF4(頂/側),較佳去氧 3·5/30sccm 。 ^ 接著參見第1B圖,塗佈一光阻層15〇,並於其上—
開口 160。接著參見第1(;圖,根據該具有開口之;阻H 為幕罩蝕刻HDPFSO層140與HDPSRO層130以形成鑲#門曰口 之後,移除該光阻層150,以形成具有鑲嵌開口 ° (130+140)。 丨电增 接著參見第1D圖,沈積一導電層17〇,如填入 於該半導體基底1 0 〇表面以填滿介電層内的開口。最 如第1E圖所示,對該金屬層17〇進行一平坦化製程,而來 成一銅鑲嵌内連線結構。 / 實施例二 以下藉由第2A至2D圖,詳細說明根據本發明之一护 成金屬層間介電層(IMD)的方法,特別適用於一多重/ 鋁内連線結構。首先,參見第2A圖,在一具有半導體元 或導電7L件220之半導體基底200,先形成一導電層22〇, 如鋁金屬層。接著於該鋁金屬層22〇定義形成一 圖案之光阻2 3 0。 a $ g 接著麥見第2B圖,以該光阻層23〇為幕罩,蝕刻該 屬層220以形成金屬導線220a。 接著,參見第2C圖,以臨場方式(in_situ),以高密
ί ΐ ί化ί氣相沈積機台中(HDP_CVD)依序形成一高密度 诠水3矽氧化物層(f!Dp_SR〇\23〇,厚度大體介於25〇_5〇〇
間,較佳者為3〇0埃。^操作壓力較佳者為5mT,射頻 F)(頂/側)較佳者為15〇〇/25〇〇112,而氣體包含· Ar(頂 /SiH^,較佳者為5/4〇sc⑽,以及〇2,較佳者為38sccm。、 而在較佳情況中,在基底1〇〇上中間區域的HDp一SR〇層丨別 厚度大於周邊區域。 接著於同一高密度電漿機台中,依序形成高密度電漿 摻氟矽玻璃層(HDP-FSG) 240,厚度大體介於50〇〇_8〇〇〇埃 之間,以完全覆蓋該金屬導線2 2 0 a,而較佳者厚度約為 6000埃’覆盖於半導體基底2〇〇表面作為層間介電層。一 般而言,摻氟矽玻璃具有較低的介電常數值,可降θ低内連 線結構中的RC延遲。其操作壓力較佳者為5[111[,射頻RF (頂 /側)較佳者為80 0/ 340 0,偏壓RF較佳者為250 0,而摔作^ 體包含:Ar(頂/SiH4),較佳者為5/4〇Sccm、〇2,較二者= 38SCCm,以及SiF4(頂/側),較佳者為3· 5/30sccm。 …、 最後,參見第2D圖,對該HDP-FSG層240進行一平坦化 製程。 一
以下,進一步以下列數據與資料揭露本發明之優點與 特徵。 〜一 試驗樣品 對照組(習知的PEOX SRO + HDP FSG) 該樣品係先在半導體基底上,先以電漿輔助化學氣相 沈積機台(PECVD)形成PE SRO層,接著將基底送至高密度
丨 12纖_18___:___ 五、發明說明(9) · 電漿機台形成HDP FSG層。 試驗組(根據本發明之HDP SRO + HDP FSG) 該樣品係根據本發明,無半導體基底上,以臨場方式 (in-situ)直接在同一高密度電漿機台(HDPCVD)上依序形 成HDP-SRO層與HDP FSG層。 試驗結果 參見第3A與3B圖,所示為兩組半導體基底之厚度分佈 圖。由第3B圖可以看出,習知的ΡΕΟχ層的其厚度分佈成同 心圓狀’其厚度由内往外加厚。而根據本發明之層, 其呈現中間較厚,而周邊較薄的分佈狀況。而由於習知 PEOX的中間部分較薄,容易使電漿製程中,電荷往中間部 分累積’造成中間區域的元件受到電漿損害(plasma damage)。而根據本發明之臨場HDPSR0與HDPFSG層則可有· 效避免晶圓中間過薄的問題。 參見第4A與4B圖,圖中所示為晶圓表面在電漿製程後 的表面電荷分佈。由圖中可以明顯看出,第4B圖中對照組 的習知製程,其表面電荷平均高達4 · 68V,而根據本發明 之试驗組’其第4 A圖之結果顯示其平均電荷僅為〇 . 4 9 V。 顯示根據本發明之臨場生成HDPSRO與HDPFSG層,有效改善 電漿製程後的電荷累積。 接著參見考〜5麗,,所示為兩組晶圓的二次離子質譜儀 (S I M S )分析結果。由圖中可以清楚看出,習知的對照組中 的Ρ Ε Ο X S R 0層並無法有效阻播上層的氟離子滲透。然而, 根據本發明的HDP SRO,其緻密度更能有效的阻擋上層
0503-8966TWf(Nl) ; TSMC2002-0587;peggy.ptd 第13頁 HD PFSG層中的氟離子滲透,因此可有效避免採用FSG材料 時’ l離子滲透對下層金屬或元件的損害。 接著參見第6圖,所示鎵、兩組之X—光電子光譜儀 (ESCA)之分析結果。由圖中結果可以看出習知的對照組 PEOX SRO層會形成N鍵結(N_b〇nding),然而本發明之試驗 組則不會形成N鍵結(n - b ο n d i n g )。 最後參見第7A盘7BFSI ,所+Iaz m。夂s笛7A闽” 所不為兩組之晶圓良率分佈 回 夕 圖’根據本發明之試驗組,复曰圓卜、套妒/ 中心(edge/center)的晶圓良率 "日日0上邊、味/ 知的對照組之〇 · 6 6。顯示相撼夫 為· 7 3 ’明顯高於習 電層其良率顯著提升。 乂本發明所形成之金屬層間介 雖然本發明以較佳實施例 定本發明,任何熟悉此項技蓺二路如上,然其並非用以限 和範圍内,當可做些許更動^ ,在不脫離本發明之精神 圍當視後附之申請專利範圍^ 因此本發明之保護範 叮界定者為準。
圖式簡單說明 第1A至1E圖所示為招姑丄 ^ B' 馬根據本發明形成一銅鑲嵌結構之金 屬層間介電層的方法流程。 弟2A至2D圖所示為椒诚Ί A ^ " 馬根據本發明形成一鋁内連線結構之 金屬層間介電層的方法流程。 第3 A與3 B圖所不為根據本發明之一實施例中,習知 PEOX層與本發明之HDP層之厚度分佈。 第4A與4B圖所示為根據本發77明之一實施例中,習知 PEOX層與本發明之HDP屉矣:+ μ , r增表面在電漿製程後的表面電荷分 佈。 第5圖所不為根據本發明之一實施例中,習知?麗層 1 ^發明之HDP層兩、组晶圓的二次離子質譜儀(sims)分析 結果。 弟6圖所示為根據本發明 U J ) Ay -rn t 〜明之一實施例中,習知PEOX層 與本發明之HDP層兩組晶圓沾 ^ ^ a 日日®的之X一光電子光譜儀(ESCA)之 分析結果。 第7Α與7Β圖’所不為根據务明之 隱層與本發明之ΟΡ層兩組晶圓的良率分佈圖】。中 符號說明 100 半 導 體 基 底; 120 刻 終 止 層; 140 HDPFSG 160 鑲 嵌 開 口 y 200 半 導 體 基 底; 110 半導體元件; 130 HDPSR0 ; 151 光阻層; 170 導電層; 210 半導體元件;
1229918 圖式簡單說明 220:導電層; 230:光阻層; 220a :導線; 230 : HDPSRO ; 24 0 ·· HDPFSG。 0503-8966TWf(Nl) : TSMC2002-0587;peggy.ptd 第16頁 111·

Claims (1)

  1. 六、申請專利範圍 93104898 修正 1 · 一種形成金屬層間介電層(I MD)的方法,適用於一 夕重金屬鎮後内連線結構,包含下列步驟: 提供一基底,其中設置一半導體元件或導電元件; 以高密度電漿化學氣相沈積法(HDP-CVD)以臨場方式 (in-situ)形成一高密度電漿内襯氧化物層與一高密度電 聚低介電常數層覆蓋於該基底表面作為一層間介電層; 於該層間介電層上定義並形成一鑲嵌開口;以及 沈積一導電層於該基底表面並填滿該鑲嵌開口。 2·根據申請專利範圍第1項所述之形成金屬層間介電 層的方法,其中該高密度低介電常數層為一高密度電漿摻 氟矽玻璃層(HDP-FSG)。 3·根據申請專利範圍第2項所述之形成金屬層間介電 層的方法’其中該高密度電漿摻氟矽玻璃層(HDP-FSG)之 厚度大體介於5000-8000埃之間。 4·根據申請專利範圍第3項所述之形成金屬層間介電 層的方法,其中該高密度電漿摻氟矽玻璃層(HDP-FSG)之 操作壓力大體為4 - 6 m T,射頻r (頂/侧)大體為 5 00- 1 20 0/30 00-380 0Hz 之間,偏壓 RF 大體為 2000-3000Hz 。 5·根據申請專利範圍第4項所述之形成金屬層間介電 層的方法,其中該高密度電漿採用Ar (頂/Si H4)大體 2- 8/30-50sccm,02 大體為 35-42sccm,SiF4(頂/侧)大體為 3- 4/25-35sccm 〇 6 ·根據申請專利範圍第2項所述之形成金屬層間介電
    0503-8966TWFl(Nl).ptc 第17頁 1229918
    A:物 電漿 7·根據申請專利範圍第6項所述之形成金屬層間介電 I略方法,其中該高密度含矽氧化物層(HDP —SRO)之厚戶 大體介於250-50 0埃之間。 又 8 ·根據申請專利範圍第7項所述之形成金屬層間介電 曰的方法’其中該高密度含矽氧化物層(HDP-SRO)之操作 壓力大體為4-6mT,射頻RF(頂/侧)大體為 1000-2000/2000一3000Hz 。 9·根據申請專利範圍第8項所述之形成金屬層間介電 層的方法’其中該高密度含矽氧化物層(HDP-SRO)係採用 Ar(頂/ SiH4)大體為2-8/30 — 5〇sccm 與〇2 大體為35-42sccm。 1 〇·根據申請專利範圍第1項所述之形成金屬層間介電 層的方法’其中該高密度電漿内襯氧化物層在該基底之中 間位置之厚度較大,以避免後續電漿損害。 11 ·根據申請專利範圍第1項所述之形成金屬層間介電 層的方法’其中更包含一步驟:對該導電層進行一平坦化 製程。 12. 種形成金屬層間介電層(IMD)的方法,適用於一 多重金屬内連線結構,包含下列步驟·· 提供一基底,其上具有一半導體元件或導電元件; 於該基底上沈積並定義一導電層與該半導體元件或導 電元件成電性接觸;以及 以高密度電漿化學氣相沈積法(HDP-CVD)臨場方式
    0503-8966TWFl(Nl)-Ptc 第18頁 1229918 案號 931048QR_年月__g--^- 六、申請專利範圍 (in-situ)形成一高密度電漿内襯氧化物層與一1^密度電 漿低介電常數層覆蓋於該基底表面作為一層間介電層。 1 3 ·根據申請專利範圍第1 2項所述之形成金屬層間介 電層(IMD)的方法,其中更包含一步驟··對該層間介電層 進行一平坦化製程。 1 4 ·根據申請專利範圍第1 2項所述之形成金屬層間介 電層的方法,其中該高密度低介電常數層為一尚密度電漿 摻氟矽玻璃層(HDP-FSG)。 1 5 ·根據申請專利範圍第1 4項所述之形成金屬層間介 電層的方法,其中該高密度電漿摻氟矽玻璃層(HDP-FSG) 之厚度大體介於5000-8000埃之間。 1 6 ·根據申請專利範圍第1 5項所述之形成金屬層間介 電層的方法,其中該高密度電漿摻氟矽玻璃層(HDP-FSG) 之操作壓力大體為4-6mT,射頻RF(頂/侧)大體為 50 0 - 1 2 0 0/3 0 0 0-380 0Hz 之間,偏壓 RF 大體為 2000-3000Hz 。 1 7 ·根據申請專利範圍第1 6項所述之形成金屬層間介 電層的方法,其中該高密度電漿採用Ar (頂/Si H4)大體 2- 8/30-5 0sccm,02 大體為35-42sccm,SiF4(頂/側)大體為 3- 4/25-35sccm 〇 1 8 ·根據申請專利範圍第1 4項所述之形成金屬層間介 電層的方法,其中該高密度電漿内襯氧化物層為高S密度電 漿含矽氧化物層(HDP-SRO)。 &
    修正 曰 案號 931n4sgs 六、_請專利範圍 電層的方法’其中該高密度含矽氧化物層(HDP-SR〇)之厚 度大體介於250-500埃之間。 “ 2 0 ·根據申請專利範圍第1 9項所述之形成金屬層間介 電f的方法,其中該高密度含矽氧化物層(HDP-SR〇)之操 作>1力大體為4-6mT,射頻RF(頂/側)大體為 1000-2000/2000一3〇〇〇Hz 。 21 ·根據申請專利範圍第2 〇項所述之形成金屬層間介 電層的方法’其t該高密度含矽氧化物層(HDp —SR〇)係採 用Ar(頂/ SiH4)大體為2-8/30-50sccm與02大體為 35-42sccm 〇 22·根據申請專利範圍第丨2項所述之形成金屬層間介 電層的方法,其中該高密度電漿内襯氧化物層在該基底之 中間位置之厚度較大,以避免後續電漿損害。 23· —種内連線結構,包含: 一基底,其中包含一半導體元件或導電元件; 一介電層,其中具有一開口與該半導體元件或導電元 件相通,包含一高密度電漿化學氣相沈積法(HDp_CVD)形 成之一高密度電漿内襯氧化物層與一高密度電漿低介電常 數層依序覆蓋於該基底表面,其中該高密度電漿内襯氧化 物層與該南费度電聚低介電常數廣係以Sa場(in__situ)方 式依序生成;以及 一導電層,用以填滿該介電層之該開口以形成内連 線。 24.根據申請專利範圍第23項所述之内連線結構,其 第20頁 0503-8966TWFl(Nl).ptc
    1229918 _案號 93104898_年月日__ 六、申請專利範圍 中該高密度低介電常數層為一高密度電漿摻氟矽玻璃層 (HDP-FSG)。 2 5.根據申請專利範圍第24項所述之内連線結構,其 中該高密度電漿内襯氧化物層為高密度電漿含矽氧化物層 (HDP-SRO)。 26.根據申請專利範圍第25項所述之内連線結構,其 中該高密度含矽氧化物層(HDP-SRO)之厚度大體介於 250-500埃之間。 2 7.根據申請專利範圍第23項所述之内連線結構,其 中該高密度電漿内襯氧化物層在該基底之中間位置之厚度 較大,以避免後續電漿損害。
    0503-8966TWFl(Nl).ptc 第21頁
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US20060237802A1 (en) * 2005-04-21 2006-10-26 Macronix International Co., Ltd. Method for improving SOG process
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