TWI250608B - Semiconductor device and method for manufacturing the same - Google Patents
Semiconductor device and method for manufacturing the same Download PDFInfo
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- TWI250608B TWI250608B TW094116606A TW94116606A TWI250608B TW I250608 B TWI250608 B TW I250608B TW 094116606 A TW094116606 A TW 094116606A TW 94116606 A TW94116606 A TW 94116606A TW I250608 B TWI250608 B TW I250608B
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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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76801—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing
- H01L21/76829—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing characterised by the formation of thin functional dielectric layers, e.g. dielectric etch-stop, barrier, capping or liner layers
- H01L21/76831—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing characterised by the formation of thin functional dielectric layers, e.g. dielectric etch-stop, barrier, capping or liner layers in via holes or trenches, e.g. non-conductive sidewall liners
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Description
1250608 九、發明說明 【交互參照之相關申請案】 本申請案係有關於同申請人、同樣申請中且與本案一起 申請之專利申請案編號第11/G48,215號“銅/低介電常數内
連線之 CxHy 犧牲層(cxHy Sacrificial Layer for Cu/Low-K
Interconnects)” 。本申請案亦有關於西元2〇〇4年i 1月J 〇 日申請的同申請人、同樣"中之專利申請案編號第 (TSM04_0369) “鑲叙結構之擴散阻障層 (Diffimon Barrier for Damascene 此⑽咖广。在此將這些 同申請人且同樣申請中之申請案一併列入參考。 一 【發明所屬之技術領域】 本發明是有關於一種半導體元件之製造,且特別是有關 於一種多孔性、低介電常數介電質之製造與製程。 【先前技術】 隨著半導體元件之密度的增加,以及電路構件之尺寸的 縮減,電阻電容(RC)延遲時間對電路性能的影響日益提升 為了降低電阻電容延遲’需將傳統介電質轉換成低;電常數 介電質。卩ϋ些低介電常數介電材料作^金屬介電質 (刪)以及内層介電f(ILD),特別有其效用。然巾,低介電 常數材料在製程期間,特別在製作内連線之導電材料的 期間’會引發一些問題。 一般利用高能量之電漿蝕刻製程來圖案化並蝕刻導電 1250608 材料。由於低介電常數材料較軟、化學穩 孔性、或上述因素的任意組合,因此低介電-。 受電襞触刻損害。t漿損害本身可產生 車又“ α
之崩潰電壓、並造成低介電常 ^電抓、較低 變。 〶数;丨電材枓之介電常數的改 -種低介電常數材料的例子為摻雜碳 矽玻璃(Organ〇silicate Glass ; 〇Sf^。古拖 有械 ) 有钱秒玻璃薄膜诵當 至少包括SiwCxOyHz,J:中四僧之切叮目士 存膜通吊 接& & ,、中四知之矽可具有種種有機族群之 替代物。-種常用之替代物產生甲基石夕酸鹽
Use — ane ; MSQ),其中甲基產生石夕甲燒(训叫鍵來取 ^石夕氧鍵。在光阻移除步驟中,#低介電常數介電質暴露在 处理電漿下時’電漿損害可能使得甲基由氳氧基所取代,因 而形成矽氫氧基(Silane^。 …丨、目前已察覺到有機矽玻璃材料之表面上的矽氫氧基鍵 曰劣化低,丨電吊’數介電薄膜之完整性。由於⑪氫氧基的存在 斤導致之種劣化之類型為低介電常數介電材料之介電常 =的增加。此外,亦察覺到受損之有機矽玻璃材料會吸收水 、、更進步,已察覺到劣化之低介電常數介電材料在暴露 於=式化學清洗期間,很難抵抗化學物之攻擊,如此將導致 低介電常數介電膜絕緣結構之關鍵尺寸(CD)產生相當嚴重 之損失。 另一種低介電常數材料的例子為多孔性介電質,例如上 用之陶氏化學(D〇w Chemical)的多孔性SILK產品與曰本合 橡知月又伤有限公司(JSR Corporation)之商品JSR 5 1 09。多 1250608 錄材料之介電常數為空氣 常數的組合。I例而▲ A …致在材科之介電 猜灿與斯〇geIs,=邦lhca)類之多孔隙性材料 衫n 在其孔洞或空隙中包含有大量之* 軋,因而可在孔洞小至5 工 於U5。 5細至1〇nm之間時,使介電常數低 ^如时碳介電質,多孔性介電f亦容 中所使用之電浆敍刻與灰化製程的損害。當介電質中= 可進入表面孔洞,因…=膜-屬化過程中的處理流體 增加。孔洞損傷亦可二/面, 性。 仏成表面從較佳之疏水性變成親水 置在1= 上示鑲介嵌:?之剖面示意圖。介電層12已設 填入後,介層窗孔!:二 溝渠Η向下延伸。當銅 連接兩導線層。由於銅之高擴散性與 在夕…再結合中心的趨勢,步驟進行時必須確件所有的 導入,此阻障中/#傳統上’大都藉助於阻障層18的 如第2圖所示襯在溝渠15與介層窗孔14之側壁上, …=上述,化學物質可能會穿透並進入低介電常數介電 貝 5進而導致其介電常數提升。低介電常數介電質之 損=成溝渠地面21與溝渠側壁23之表面粗化,如第^ 圖兵弟J所不。較為粗糙之表面意味著阻障層18之厚度 :权正::度大’如第2圖所示,以確保無薄貼片讓銅移動 牙過車乂厚之Ρ且障層1 8將導致電阻電容延遲時間的增加而 1250608 相對地抵鎖掉低介電常數介電質之優勢。 如同上述,介電質損 潰電璧、以及低介雷曰較南之漏電流、較低之崩 於這肚盥i #門m ;ί逼吊數的改變。有鑑 的方法。 低W電吊數介電質製造 【發明内容】 本發明之目的就是在提供-種修補低介電常數介電質 之孔洞損傷或碳耗指,Α中與由m ,屯昂數"電貝 可解、…… 用本發明之較佳實施例, 了解决或防止上述或其他問題,並具有技術優勢。 本發明之一較佳實施例中,提一 造方法。此方法至少包括开H 種+導體元件之製 ^ G括形成低一介電常數介電層、形成一 凹陷特徵於低介電常數介電声中 ^ L , ㊉数"冤層中以及形成一碳氫化合物層 於上述之凹陷特徵内,其中形成碳氫化合物層之步驟至少包 括使具有碳-碳雙鍵之碳氫化合物前驅物產生化學反應。此 方法更包括形成一導電層於上述之凹陷特徵中,其中此導電 層f滿而溢出凹陷特徵。在較佳實施例中,前述之碳氫化合 物前驅物至少包括α_松油烯(alpha_terpinene ; ATRp广乙烯 (C^4)以及與通式為⑷相關之化學物 質。 替代之方式包括一種具有多孔性低介電常數介電層之 半導體元件的製造方法。此方法至少包括:形成一凹陷特徵 於多孔性低介電常數介電質層中,其中形成此凹陷特徵之步 驟包括利用一電漿製程;以及形成一碳氫化合物層於多孔性 1250608 ^勺電泰數;丨電夤層上,其中形成此碳氯化合物層之步驟至 、吏八有奴-奴雙鍵之碳氫化合物前驅物產生化學反 :八戈之μ轭例更包括將碳從碳氫化合物層擴散至多孔性 低’I電常數介電質層。 人 八他κ鉍例中,提供了一種在半導體製程中受損之低 數”層的修補方法。此方法至少包括··藉由利用電 曰凰化予孔相》儿積反應製程來反應前驅材料,以沉積-碳 二二物層於低介電常數介電層上,其中碳氫化合物層至少 ^ 於約20至約95原子百分比的碳、介於約5至約80 分比的氫、以及介於約0至約5原子百分比的氧。替 Si施例至少包括移除鄰近於窄介層窗開口之碳氫化合 以及形成一擴散阻障層至少位於碳氫化合物層上。 豆中Hi之另一些其他實施例中,包括-種半導體元件, 件係利用本發明所提供之實施例並進一步 此半導』之介電質孔洞所製成。在其他實施例中, 及一 包括·—主介電區,具有-主碳濃度;以 "電區位於主介電區上,其中此表面介電區之碳濃 度大於或等於主碳濃度之約95%。在又一… 中,卜汗+你人;丄 社 些其他貫施例 介電^上V面八 '數介電層至少包括一表面介電區位於主 J 表面介電區之碳濃度低於主碳濃度不超過約5 =的一點是’雖然在通篇專利說明書與申請專利 粑圍中使用專門術語之半導體材料層,利用 = 所產生之特徵不應永遠視為連續或不間斷之特徵。藉由 1250608 可分成不同且隔離之特 至少包括此半導體的一 本說明書之内容,將清楚此半導體層 徵(例如主動區),其中之某些或全部 部分。 以下將描述本發明之實施例的附加特徵與優點,這 加特徵與優點構成了本發明之中請專利範圍的課題。熟習 項技藝者應可了解到其可㈣地以所揭露之特施 基礎’來修正或設計其他結構或製程,以實現本發明= 的。熟習此項技藝者亦應可了解到,所描述之示範實施例中 ^類的等效架構與變化並不脫離如後时請專利範圍中所 提出的本發明之精神與範圍。 【實施方式] 以下將詳細討論本較佳實施例之操作與製造。然而,在 此所=之實施例與例子並非本發明僅有之應用或運用。在此 寸之特疋貝施例僅係製作或使用本發明之特定方式的 牛例虎明,並非用以限制本發明或後附申請專利範圍的 圍。 本發明是有關於一種半導體元件之製造,且特別是有關 於種多孔性、低介電常數介電質之製造與製程。這些低介 電韦數;|電層可包括許多薄膜或許多層,但實施例並不限於 itb能 二心。以下將以特定内容,即在鑲嵌製程中銅導線與介 曰固之製作’的較佳實施例來描述本發明。可相信的一點 疋 ▲本發明之實施例應用在此製程中時,將具有明顯優 勢更可相信的一點是,當本發明之實施例運用在其他關注 10 1250608 低介電常數介電層之性能的半導體製作應用上,亦具有其優 勢。更可相信的一點是,在此所描述之實施例將有利於其他 未特別提及之積體電路内連線的應用。因此,在此所討論之 特定實施例僅係用以說明製造與應用本發明之特定方法,並 非用以限制本發明之範圍。 見明 > 苐3圖,其係緣示欲依照本發明之較佳實施例 與示範鑲嵌製程來進行處理的—财間代表性之鑲喪結構 的剖面圖。第3圖所示係半導體之基材3(H,此基材3〇1可 例如至乂包括矽、絕緣層上有矽(s〇I)、功能性與邏輯元件、 其他内連線層、或其組合。以下為描述本發明之實施例的目 的,基材301至少包括内層介電層(ILD)以及導電内連線。 鑲嵌製程的詳細說明,Ba〇等人已在美國專利案編號第 6,248,665號以及美國專利申請案公開編號第2〇〇4/〇i2i583 號中加以描述,在此一併列入參考。 咕再次參照第3圖,第一蝕刻終止層3〇3位於基材3〇 i 上。低介電常數介電層305位於第一蝕刻終止層3〇3上,其 中此低電常數介電層3〇5亦稱為内金屬介電層(imd)、内 層介電層(ILD)或介電層。合適之低介電常數介電質包括摻 雜奴之一氧化石夕’亦稱為有機矽玻璃(〇rgan〇 siiicate Glass ’ OSG)以及碳氧化物。低介電常數介電層3〇5之較佳 厚度介於約5000A至約9000人之間,且較佳係經平坦化。 一、範之有枝低,丨電吊數材料包括聚芳基酉旨 ether)、氫矽酸鹽(hydr〇gen silsesqui〇x_ ; hsq)、含曱基 之石夕酸鹽(methyl siisesqui〇xane ; mSQ)、聚矽酸鹽 1250608 (polysilsesquioxane)、聚亞醯胺(p〇iyimide)、苯環丁烯 ‘ (benzocyclobutene ; BCB)、以及非晶系聚四氟乙烯 ' (amorphous polytetrafluoroethylene ; PTFE)(通常又稱鐵氟 龍,Teflon® )。適合本發明之方法的其他類型之低介電常 數材料包括氟矽玻璃(Fluorinated Silicate Glass ; FSG),例 如摻雜氟之一甲基石夕酸鹽[fluorine-doped -(0-Si(CH3)2-0)-] ’ 以及棚填石夕玻璃(B〇r〇phosphosilicate 鲁 Glass ·’ BPSG)、侧石夕玻璃(Borosilicate Glass ; BSG)、與碟 石夕玻璃(Phosphosilicate Glass ; PSG)。 低介電常數介電層305亦可包括一種低介電常數介電 質,此種低介電常數介電質通常稱為超低介電常數(Extreme Low-k ; ELK)介電質。超低介電常數介電質一般具有低於約 2之介電常數,且這些超低介電常數介電質包括多孔性之介 電質。合適之超低介電常數介電材料可包括氮化矽、氧化 矽、旋塗玻璃(SOG)、電漿增益(PE)之四乙氧基矽曱烷 ⑩ (Tetraethoxysilane ; TE0S)、_化之氧化矽、以及氟矽玻璃。 其他更佳之超低介電常數介電質包括含有未反應且孔 洞生成之材料、或製孔劑(por〇gen)。將製孔劑加熱至高於 其分解溫度,而在介電質中形成孔洞。舉例而言,陶氏化學 (Dow Chemical)之多孔性SILK產品與日本合成橡膠股份有 限公司(JSR Corporation)之商品JSR 51〇9為合適之商用低 介電常數前驅物,其中這些低介電常數前驅物係利用有機母 體材料(Organic Host Material)。在較佳實施例中,低介電 常數介電質至少包括希普勵(Shipley)公司所提供之商用 12 1250608 /ON M低介電常數内層介電質。ZIRKON™低介電常數内 層介電質係一種以含曱基之矽酸鹽(MSQ)為基礎材料與散 佈在溶劑丙二醇單甲基醚酯(PGMEA)中之丙烯酸 高分子聚合物系統之奈米微粒製孔劑之混合。另 種替代之較佳超低介電常數包括電漿增益化學氣相沉積
Slw〇xCyHz ’因為不論其有或沒有製孔劑,均具有達成^ < 2的可能性。
,#乂佺係利用傳統之旋轉塗佈機來沉積低介 s系數内層’丨冑負。待沉積後,較佳在垂直爐管巾進行部分 之t復以交互連結母體,其中溫度介於約25至3⑽。◦之 間。ZIRKON™低介電常數内層介電f之製孔劑的衰減開始 於約275 C,且完全衰減發生在約45〇它。 請參照第4圖’其係繪示第3圖之中間半導體元件經進 步开y成非等向性蝕刻之中間雙重金屬鑲嵌結構85後的側 :剖面圖。在此中間之雙重金屬鑲嵌結構85中,係由介層 窗104與上方之溝渠1〇6所構成之凹陷特徵。 製作第—雙重金屬鑲嵌結構85時,係先利用微影圖案 化以及非等向性蝕刻,來形成介層窗1〇4穿過低介電常數介 電層305、以及至少一部分之第一蝕刻終止層3〇3。接下來, 利用相似之製程來進行微影圖案化與非等向録刻,以形成 溝渠106穿過第一蝕刻終止層3〇3、以及部分之低介電常數 介電層305。這些步驟形成溝渠1〇6位於且圍繞在介層窗… 之上方。可了解的一點是,溝渠1〇6可包圍一或多個介層窗 104’溝渠106與介層窗104可形成於不同之堆疊介電層中, 13 1250608 =:二同之堆疊介電層之間形成有另,刻終止 二士:二“吊數介電層3G5之表面可包括其他凹陷之特徵, 例如溝朱86’以容納更多内層導電層。 2應用在鑲嵌製造方法中之電㈣刻會傷及低介電 吊數;丨電質。在第人 a中低"電常數介電層305之損傷由
八;a V面可看出。值得注意的—點是,這樣的損傷延伸至溝 ,86與溝渠106 t側壁以及介層冑104之側壁。如以上所 提广知可包括表面粗糙、受損之孔洞、打開之表面孔洞以 及石厌耗扣…般而言’溝渠受損之狀況較介層窗嚴重。 、見了參妝第5圖,並根據較佳實施例,較佳係利用電漿 增盈化學氣相沉積方式來使碳氫化合物之前驅物產生化學 反應,藉以沉積碳氫化合物層307,其中此碳氫化合物層307 至 >、包括CxHy。合適之碳氫化合物前驅物包括具有充分之 揮發性的化學物質,如此一來,這些化學物質可在反應容器 中形成蒸氣。較佳之前驅物為經取代之己烷衍生物α_松油 細(Substituted Hexane Derivative a -terpinene ; ATRP)[(CH3)2CHC6H6CH3]或乙烯(c2H4)。替代之前驅物包括 α-松油烯同源物(α _terpinene Anai〇gs),其中α甲基由直鏈 烧基’即與通式(CH3)2CHC6H6-CnH2n+1相關之化學物質,所 取代。另一些替代之前驅物包括任何其他碳氫化合物,較佳 是具有碳-碳雙鍵之碳氫化合物。在溝渠深度約2000A時, 碳氫化合物層307之厚度通常約介於約40A至約50A之間。 電漿增益化學氣相沉積製程較佳係包括惰性載氣,例如 氦氣。氦氣之流量可介於約25sccm至約lOOOOsccm之間, 1250608 車乂 it係”於約5〇sccm至約5〇〇〇sccm之間。基材之溫度介 於約25°c至約400°C,且較佳係介於約125°c至約35〇。〇之 間。射頻功率密度介於約50W至約2500W,且較佳係介於 約50W至約1500W。在沉積製程中,反應器壓力介於約 lOOmTon:至約1G()()()mT()]:r之間,較佳係介於約⑽^ 至約80〇〇mTorr之間。 根據本發明,碳氫化合物層3〇7較佳係至少包括:介於
、、、勺2〇至約95原子百分比的碳;介於約0至約5原子百分比 =氧;以及介於約5至㉚80原子百分比的氣。在薄膜之沉 * 1私,月間,文控制之主要製程變量為射頻功率、前驅物流 率、反應器壓力以及基材温度。 在某些情況下,碳氫化合物層3〇7之建立可部分阻隔窄 凹fe特试,例如介層窗1〇4,的開啟。除非移除阻礙,否則 將會妨礙導體沉積於介層窗⑽中,因而導致元件之性質下 :’例如電阻電容延遲。因此’本發明之實施例可進一步包 ::啟之介層窗104進行金屬形成前之清潔步驟。此金屬 〜則之清潔步驟包括在約25°c至35G°C下進行小於約1 刀鐘之氬/氫或氫電漿清潔處理。 沉積石”—替代實施例中’係利用原子層沉積(則)方式身 牲%厌^化合物層3〇7。在沉積碳氫化合物層307於窄凹Η 積:’例如介層窗1〇4,之側壁上時,較佳係採用原子層沒 π, 曰^有回度之共形特性,而不會阻隔窄南 且對乍特徵具有良好之穿透性。
同Χ上所4,在傳統製程中,—種低介電常數介電I 15 I25〇6〇8 經卢审系使低;l電$數介電層表面粗化。中請人發現傳統上 均方過之;1電貝層在溝渠1G6底部的平均表面粗化值之 補牛驟:13·89Α。在至少包括Cxiiy層之沉積的孔洞密封修 步驟後,溝準翻^卜 t .1§ . 算木粗化之方均根值降至&73A。分析後之結果 二’碳耗損受損層可藉由CxH〆覆蓋而適當地恢復其 兔含量的程度。 車又佳貫施例之結果繪示於第6圖中。低介電常數介電層 之平順表面代表具有經封住之孔洞的修補表面。 據本&月之佳貫施例’碳自碳氫化合物層術擴散 :介電常數介電層305中,因而在低介電常數介電層3〇5 面上形成虽含碳之區域3()5,。為方便起見,在低介電 吊數介電層305中之碳分布’在主介電區内稱為主碳程度, 人。表面"電區則稱為甬含碳之程度。虛線以距低介電常數 "電層305之表面x的距離畫過低介電常數介電層如,而 圖不出低介電常數介電層3〇5中的富含碳之區域3〇5,。 〜此一擴散過程形成經碳調節之區域3〇9鄰近於低介電 吊數介電層305之溝渠側壁’其中經碳調節之區域3〇9的厚 度為:。“交佳係介於約3〇〇人至5〇〇A之間。根據本發明之 較佳實施例’經碳調節之區域3〇9可部分修補由傳統溝渠蝕 刻或電漿處理所造成之碳消耗的損傷。當依照所述之較佳實 施例來沉積碳氫化合物4 3G7時,χ之厚度一般係介於約 300Α至500Α之間。 在含碳之低介電常數介電質的傳統處理中,低介電常數 表面通常會產生碳的消耗一般而言,鄰近於表面介電質之 16 1250608 厌辰度下降至主介電質之碳濃度以下約5%至約⑽。然 :人在山本發明之較佳實施例中,相對於主介電質之碳濃度, 田:厌之區域3〇5’的碳濃度下降小於約5%。換言之,傳統 程會從低介電常數介電質消耗表面之碳超過約5%,因 而降低表面之碳濃度至小於其原來濃度㈣㈣。較佳實 施例將碳濃度復原至其原來濃度之至少約95% 。 較佳係利用溫度介於約3〇(rc至約4〇〇t:2熱處理,來 移除任何之CxHy層殘餘。—般而言,這樣的熱處理可輕易 =整合至另一製程中。舉例而言,銅鑲嵌製程通常包括氫電 浆處理’藉以從超低介電常數介電質移除水氣,或者在銅線 之縮減中移除氧化鋼(Cu〇x)。這類步驟通常係在足以移除 CxHy層殘餘的情況下進行。在所有之c而層殘餘移除後, 可進行傳統製程來完成鑲嵌結構。 現請參照第7圖,將阻障^ 116全面性地沉積在第6 °中]元件上。阻卩早層116之厚度較佳係約為1 〇A至1 〇〇A 之間且此阻障層116可阻障銅的擴散。阻障層i丨6可包括 金屬氮化物,例如氮化鈕(TaN)、氮化鈦(TiN)、氮化鎢(WN)、 氮化铽(TbN)、氮化釩(VN)、氮化鍅(ZrN)、氮化鉻(CrN)、 碳化鎢(wc)、氮化鎢(WN)、碳氮化鎢(WCN)、氮化鈮(NbN)、 氮化鋁(A1N)及上述材料之組合。在其他實施例中,阻障層 11 6包括鈕/氮化鈕雙層結構。 可利用物理氣相沉積(PVD)、化學氣相沉積(CVD)、電 漿增益化學氣相沉積(PECVD)、或電漿增益原子層沉積 (PE ALD) 4技術來形成阻障層丨丨6。在較佳實施例中,阻障 !25〇6〇8 層116包括氮化* ’且係利用原子層 阻障層11 ό。 〃刀八木/儿檟 替代之實施例可進—+ a h 層m與其上方之導體層二::層二未:示)介:阻障 之間的附著。此黏著層較佳係可:曰:;:#各層 佳係少於約_。:著 == 為 料包含由·)、组:、:包括:广層材料層 ㈠鋼合金、上述材料之氮化:(=_)、_)、 一、, 十芡虱化物、及上述材料之組合。 ’儿積導體層之别’先利用例如物理 式選擇性地沉積晶種層__)(未二: 至700Α之連續層於晶圓之處理表面Π 體。-〜之導電表面’以利在電化學沉積製程中沉積鋼主 學、、冗ΓΐΓ照第7圖’待轉層116沉積後,利用傳統電化 =製程電鍍導體層31。,以填滿溝渠86、雙重金屬鑲嵌 ’厂106、與介層窗104,並形成位於溝渠平 :::::二度填充),其中導體層™
相、沉積::、:=真:方法’例如物理氣相沉積W 能力,因此較佳係具有優異之填隙與階梯覆蓋 體層…實;1= 積銅。在#代實施例中,導 及上述材料之合金化合物。 肖〜合物、 18 1250608 較佳係運用化學機械研磨(CMP)來平坦化導體層3i〇至 第8圖所示之程度。在另-替代實施例中,電研磨或日過載縮 減可用來取代化學機械研磨或與化學機械 此替代實施例中,可同時進行化學機械研磨與二在 上述之本發明之實施例僅為示範例並非用以限制本發 :之範圍,且對於熟習此項技藝者而言,各種變型為顯而易 見’而包括本發明之特徵之這些變型落在本發明之範圍盥所 附申睛專利範圍中。雖然、本發明之實施例及其優點已詳細描 =如然應該了解到的—點是’在不偏離后附中請專利範 所U之本發明的精神與範圍了 ’當可在此進行各種改 變、取代以及修正。 而:,此項技藝者將可輕易地了解到在此所描 ;、言夕特试功此、製程及材料可在本發明之範圍内變 明^卜’本申請案之範圍並非用以將本發明之範圍限制在 所描述之製程、機械、製造、物質成分、手段、方法 2 Y驟的特定實施例中。任何在此技術領域中具有通常知 :將可輕易從本發明之揭露中了解到,現存或日後所發 實之可與上述之對應實施例執行實質相同之功能'或達到 之結果的製程、機械'製造、物質成分、手段、方 ^广’均可依據本發明來加以應用。因此,所附之申請 方法::係用以將這類製程、機械、製造、物質成分、手段、 去或步驟涵括在其範圍内。 圖式簡單說明 19 1250608 為了更完整了解本發明及其優點,請參照上述輔以所附 圖示所作之說明。其令,所附之圖示包括: 第1圖與第2圖係繪示半導#; > 士 y由Μ β山& 亍¥體το件在傳統鑲嵌製程中之 中間步驟的剖面圖,其中圖示屮柄 口丁出低介電常數介電質表面的損 傷。 第3圖係繪示依照本發明一 一 &仏實施例的一種半導體 元件在示範鑲嵌製程中之中間步 一 』ν驟的剖面圖,其中此半導體 元件包括含碳及/或多孔性介電質。 第4圖係繪示本發明一較佳 一 平乂住只施例之剖面圖,其中進一 步圖示出電漿及/或餘刻製程之損傷。 第5圖係繪示本發明一較每 Ψ ^ ^ ^ 1土灵^例之剖面圖,其中圖示 出石厌虱修補層的沉積。 第6圖係繪示本發明一較 山αv 只施例之剖面圖,其中圖示 出經修補之低介電常數介電層。 口 第7圖係繪示本發明一較佳 出尚未妳化風嬙# ^ 之剖面圖,其中圖示 出予機械研磨平坦化之前的結構。 第8圖係繪示本發明—較 屮經化學機妯m命τ 只她例之剖面圖,其中圖示 出、,工化予钱械研磨平坦化後之 數介電層。 構以及昌含碳之低介電常 在不同目$巾之相對應圖號 之部分,除非另有彳t # m - r ' 般係表示相對應 乃坷払疋。圖不係繪示成 … 例之相關方面’而無需依比例繪示。-是圖例較佳貫細 主要元件符號說明 20 1250608 11 :導線層 14 :介層窗孔 1 8 :阻障層 23 :溝渠側壁 86 :溝渠 106 :溝渠 301 :基材 305 :低介電常數介電層 307 :碳氫化合物層 12 :介電層 15 :溝渠 2 1 ··溝渠地面 85 :雙重金屬鑲嵌結構 104 :介層窗 11 6 :阻障層 3 03 :第一蝕刻終止層 3 05’ :富含碳之區域 310 :導體層
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Claims (1)
1250608 十、申請專利範圍 1· 一種半導體元件之製造方法,至少包括: 形成一低介電常數介電層; 形成一 ^特徵於該低介電常數介電層中; 形成一灰氫化合物層於該凹 人仏> η 特破中,其中形成該碳 氫化合物層之步驟至少包括化學 山斤 »山# 入 反應一石反氫化合物前驅 物,该妷虱化合物前驅物具有一碳-碳雙鍵;以及 形成-導體層於該凹陷特徵中,其中該導體層填滿該 凹陷特徵。 2.如申睛專利範圍第丨項所述之半導體元件之製造 方法,其中形成該碳氫化合物層於該凹陷特徵之步驟包括 利用一電漿增益化學氣相沉積製程。 3 ·如申請專利範圍第2項所述之半導體元件之製造 • 方法,其中該電漿增益化學氣相沉積製程包括·· 設定一基材溫度至介於實質125 °C至實質350 °C之 • 間; 設定一電漿增益化學氣相沉積反應器壓力至介於實 質500mTorr至實質8000mTorr之間;以及 設定一電漿增益化學氣相沉積反應器功率至介於實 質50W至實質1500W之間。 22 1250608 4 ·如申請專利範圍第1項所述之半導體元件之製造 方法,其中形成該破氫化合物層於該凹陷特徵内之步驟包 括使用一原子層沉積製程。 5 ·如申請專利範圍第1項所述之半導體元件之製造 方法,其中該低介電常數介電層至少包括一材料,且該材 料係選自於實質由有機石夕玻璃(OSG)、侧填石夕玻璃 (BPSG)、硼矽玻璃(BSG)、磷矽玻璃(PSG)、聚芳基酯 (polyarylene ether)、氫矽酸鹽(HSQ)、含甲基之矽酸鹽 (MSQ)、聚石夕酸鹽(p〇lySilseSqUi〇xane)、聚亞醯胺 (polyimide)、苯環丁烯(BCB)、聚四氟乙烯(PTFE)、氟矽 玻璃(FSG)、多孔性氧化物、多孔性氮化物、製孔劑、及 其組合所組成之一族群。 6·如申請專利範圍第1項所述之半導體元件之製造 方法,其中該碳氫化合物前驅物至少包括一材料,且該材 料係選自於實質由α-松油烯(ATRP)、乙烯以及與通式 (CH3)2CHC6H6-CnH2n + 1相關之化學物質所組成之一族群。 7 ·如申請專利範圍第1項所述之半導體元件之製造 方法,其中該碳氫化合物層至少包括: 介於實質20至實質95原子百分比的碳; 介於實質5至實質80原子百分比的氫;以及 介於實質0至實質5原子百分比的氧。 23 1250608 :生-種利用申請專利_ 1項之方法製造之半導 體兀件,其中該低介電常數介電層至少包括·· 一主介電區,具有一主碳濃度;以及 一表面介電區位㈣主介電區上,其中該表面介電區 之-碳濃度低於該主介電區之該主碳濃度不超過實質5 9. 一種具有多孔性之低介電常數介電層之半導體元 件的製造方法,至少包括: 形成一凹陷特徵於該多孔性之低介電常數介電層 中,其中形成該凹陷特徵之步驟包括利用一電漿製程; 形成一碳氫化合物層於該多孔性之低介電常數介電 層上,其中形成該碳氫化合物層之步驟至少包括化學反應 石厌氫化合物前驅物,該碳氫化合物前驅物具有一碳_碳 雙鍵;以及 將碳自該碳氫化合物層擴散至該多孔性之·低介電常 數介電層。 10. 如申請專利範圍第9項所述之具有多孔性之低介 電常數介電層之半導體元件的製造方法,其中該碳氫化合 物前驅物至少包括一材料,且該材料係選自於實質由I 松油烯(ATRP)、乙烯、與通式相關 之化學物質、及其組合所組成之一族群。 24 1250608 11.如申請專利範圍第9 + #批人+㈡ 貝所述之具有多孔性之低介 電吊數”電層之半導體元件的 &人ρ I化方法,其中形成該碳氫 化合物層之步驟包括使用一 辽 使用原子層沉積製程。
12·如申請專利範圍第 電常數介電層之半導體元件 物層至少包括: 9項所述之具有多孔性之低介 的製造方法,其中該碳氫化合 介於實質20至實質95原子百分比的碳; 介於實質5至實質80原子百分比的氳;以及 介於實質0至實質5原子百分比的氧。 13.如申清專利範圍第12項所述之具有多孔性之低 介電常數介電層之半導體元件的製造方法,其中該碳氫化 合物層實質包含: 介於實質2〇至實質95原子百分比的碳; 介於實質5至實質80原子百分比的氫;以及 介於實質〇至實質5原子百分比的氧。 14.如申請專利範圍第9項所述之具有多孔性之低介 電常數介電層之半導體元件的製造方法,其中該多孔性之 低介電常數介電層至少包括一材料,且該材料係選自於實 質由有機矽玻璃(OSG)、硼磷矽玻璃(BPSG)、硼矽玻璃 (BSG)、石粦石夕玻璃(PSG)、聚芳基酯(polyarylene ether)、 25 1250608 氫矽酸鹽(HSQ)、含甲基之矽酸鹽(MSQ)、聚石夕酸鹽 (polysilsesquioxane)、聚亞醯胺(p〇lyimide)、苯環丁烯 一 (BCB)、聚四氟乙烯(PTFE)、氟矽玻璃(FSG)、多孔性氧 化物、多孔性氮化物、製孔劑、及其組合所組成之一族群。 15· —種利用申請專利範圍第9項之方法製造之半導 體元件,其中該半導體元件更至少包括: φ 一主介電區,具有一主碳濃度;以及 一表面介電區位於該主介電區上,其中該表面介電區 之一碳濃度大於或等於該主碳濃度之實質95% 。 16· —種利用申請專利範圍第9項之方法製造之半導 體元件,其中該半導體元件更至少包括: 一孔洞,為該碳氫化合物層所封住,其中該碳氫化合 物層實質上係由介於實質2〇至實質95原子百分比的碳、 _ ’丨於貝貝5至實質80原子百分比的氫、以及介於實質〇 至實質5原子百分比的氧所組成; 一主介電區,具有一主碳濃度;以及 表面彳電區位於該主介電區上,纟中該表面介電區 之一碳濃度大於或等於該主碳濃度之實質95% 。 17·種L補半導體元件製程中所造成之低介電常 數介電層之損傷的方法,至少包括: 利用t漿增盈化學氣相沉積反應製程來反應一前 26 1250608 驅物質,以沉籍一 積厌虱化合物層於該低介電常數介電層 ,/、中該碳氫化合物層至少包括·· 介於實質20至實質95原子百分比的碳; 介於實質5至實質80原子百分比的氫;以及 介於實"至實質5原子百分比的氧; 移除鄰近於—窄介層窗之—碳氫化合阻礙物;以及 形成擴散阻障層至少位於該碳氫化合物層上。 18.如中請專利範圍第17項所述之修補半導體元件 、紅中所造成之低介電常數介電層之損傷的方法,更包括 一電漿蝕刻製程。 19·如申請專利範圍第丨7項所述之修補半導體元件 製程中所造成之低介 a 二 低’丨電吊數介電層之損傷的方法,其中該 刖驅物質至少包括一材料,且該材料係選自於實質上由 C2H4、(CH3)2CHC6H6CH3、與通式(CH3)2CHC6H6-CnH2n+1 相關之化學物質、及其組合所組成之一族群。 ,20_如申請專利範圍第17項所述之修補半導體元件 製程中所造成之低介電常數介電層之損傷的方法,其中該 :介電常數介電層^包括一材#,且該材料係選自於實 質上由有機矽玻璃、硼磷矽玻璃、硼矽玻璃、磷矽玻璃、 水芳基酯(p〇lyarylene ether)、氫矽酸鹽、含曱基之 矽I鹽(MSQ)'聚矽酸鹽(p〇lysilsesqui〇xane)、聚亞醯胺 27 1250608
(polyimide)、苯環丁烯(BCB)、聚四氟乙烯(PTFE)、氟矽 玻璃(FSG)、多孔性氧化物、多孔性氮化物、製孔劑 (porogen)及其組合所組成之一族群。 28
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CN100403514C (zh) | 2008-07-16 |
TW200629467A (en) | 2006-08-16 |
US20060172531A1 (en) | 2006-08-03 |
CN1815709A (zh) | 2006-08-09 |
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