TWI300973B - Method for forming a semiconductor device - Google Patents

Method for forming a semiconductor device Download PDF

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TWI300973B
TWI300973B TW095100887A TW95100887A TWI300973B TW I300973 B TWI300973 B TW I300973B TW 095100887 A TW095100887 A TW 095100887A TW 95100887 A TW95100887 A TW 95100887A TW I300973 B TWI300973 B TW I300973B
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semiconductor device
manufacturing
deep trench
buried
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TW095100887A
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TW200644174A (en
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Pei Ing Lee
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Nanya Technology Corp
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    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10BELECTRONIC MEMORY DEVICES
    • H10B12/00Dynamic random access memory [DRAM] devices
    • H10B12/30DRAM devices comprising one-transistor - one-capacitor [1T-1C] memory cells
    • H10B12/48Data lines or contacts therefor
    • H10B12/485Bit line contacts
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
    • H01L21/18Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
    • H01L29/66Types of semiconductor device ; Multistep manufacturing processes therefor
    • H01L29/66007Multistep manufacturing processes
    • H01L29/66075Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
    • H01L29/66227Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
    • H01L29/66409Unipolar field-effect transistors
    • H01L29/66477Unipolar field-effect transistors with an insulated gate, i.e. MISFET
    • H01L29/66568Lateral single gate silicon transistors
    • H01L29/66613Lateral single gate silicon transistors with a gate recessing step, e.g. using local oxidation
    • H01L29/66621Lateral single gate silicon transistors with a gate recessing step, e.g. using local oxidation using etching to form a recess at the gate location
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
    • H01L29/66Types of semiconductor device ; Multistep manufacturing processes therefor
    • H01L29/68Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
    • H01L29/76Unipolar devices, e.g. field effect transistors
    • H01L29/772Field effect transistors
    • H01L29/78Field effect transistors with field effect produced by an insulated gate
    • H01L29/7833Field effect transistors with field effect produced by an insulated gate with lightly doped drain or source extension, e.g. LDD MOSFET's; DDD MOSFET's
    • H01L29/7834Field effect transistors with field effect produced by an insulated gate with lightly doped drain or source extension, e.g. LDD MOSFET's; DDD MOSFET's with a non-planar structure, e.g. the gate or the source or the drain being non-planar
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10BELECTRONIC MEMORY DEVICES
    • H10B12/00Dynamic random access memory [DRAM] devices
    • H10B12/01Manufacture or treatment
    • H10B12/02Manufacture or treatment for one transistor one-capacitor [1T-1C] memory cells
    • H10B12/05Making the transistor
    • H10B12/053Making the transistor the transistor being at least partially in a trench in the substrate
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10BELECTRONIC MEMORY DEVICES
    • H10B12/00Dynamic random access memory [DRAM] devices
    • H10B12/30DRAM devices comprising one-transistor - one-capacitor [1T-1C] memory cells
    • H10B12/34DRAM devices comprising one-transistor - one-capacitor [1T-1C] memory cells the transistor being at least partially in a trench in the substrate
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10BELECTRONIC MEMORY DEVICES
    • H10B12/00Dynamic random access memory [DRAM] devices
    • H10B12/30DRAM devices comprising one-transistor - one-capacitor [1T-1C] memory cells
    • H10B12/37DRAM devices comprising one-transistor - one-capacitor [1T-1C] memory cells the capacitor being at least partially in a trench in the substrate
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10BELECTRONIC MEMORY DEVICES
    • H10B12/00Dynamic random access memory [DRAM] devices
    • H10B12/30DRAM devices comprising one-transistor - one-capacitor [1T-1C] memory cells
    • H10B12/48Data lines or contacts therefor
    • H10B12/488Word lines

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Ceramic Engineering (AREA)
  • Semiconductor Memories (AREA)
  • Semiconductor Integrated Circuits (AREA)

Description

1300973 九、發明說明: 【發明所屬之技術領域】 本發明係有關於-辭導體元件之製造㈣, 關於-種轉體元叙製造減的雜。 km 【先前技術】 導體讀,如記憶體元件、用以資料儲存之動態隨機存取記憶 -(Dynamic Random Access Memory, DRAM) ^ ^ 為目前所廣泛使用,且許多申請案正進行此方面之研究。、’、 ,。而傳、、A上電Ba體及位元線插塞的方法需要至少兩道微影 裝私’其導致侧光罩之高製造成本。於四道微影製程之間所造成之 嚴重的對準誤差,其包含電容、主動區、電晶體、及位元線插塞等四 道製程階段,且亦影_製輯境,_地,_祕賴存取記憶 -尺寸的縮減這種失敗率會i趨嚴重。據此,目前所需的是提供一 種兄憶體7G件之字元線及位元雜塞的製造方法。 【發明内容】 3本發明為提供-種轉·件的製造方法。本發明之—實施例為 提供-種形成半導體元件之方法,其包括提供_具有嵌壁式閘極與深 2槽電容元件於基底之中,其暴露岐壁式.之突出部與深溝槽電 谷轉之上部,且於上部及突出狀舰形成間雜,並於間隙壁間 之間隙形成-由導f材料組成之埋人層,另對基底、間雜、及埋入 層進仃贿化以形成平行之淺賴結構進而定義絲區,以及於淺溝 槽結構内形成-介電材料層,而其中部分埋人層可作為埋入插塞。 〇548-A5〇483-TWf/AU94〇43/Jyliu 5 •1300973 【實施方式】 本發明將藉由以下雜佳具體實施_作更進—步地詳細說 明,但這些具體實施例僅是作為舉例說明,而_以限定本發明之範 疇。 本發明說明書中,諸如「存在於基底上方(〇v吻ing the substrate)」、「在層之上方(ab〇vethelayer)」、或「位於膜上— the film)」僅表示相對於基底層之表面的相對位置關係,並無關乎中 間層的存在與否。據此,此種表示不僅指出—或多層直接接觸之狀 怨’且指出一或多層之未接觸狀態。 請參考第1圖,先行形成一基底100,於基底1〇〇内係具有深溝 槽電容元件102,且深溝槽電容元件102之上部1〇4乃位於基底1〇〇 之表面,墊層106及如氮化矽(SiN)等之介電覆蓋層1〇8係形成於 洙溝槽電容元件1〇2上部1〇4之側壁,介電覆蓋層1〇8為具有凹陷區 (concave area),此凹陷區係實質上位於兩鄰近深溝槽電容之上部 104之間的中間位置。是以,可對介電覆蓋層1〇8、墊層1〇6、及基 底100進行自行對準且蝕刻製程以形成位於溝槽電容元件102之間的 嵌壁式溝槽110。 請參考第2圖,對鄰接嵌壁式溝槽110之基底1〇〇。進行摻雜以 形成環繞嵌壁式溝槽110之通道區域114,接著,形成一閘極介電層 116,較佳地為包含氧化矽,於基底1〇〇上之嵌壁式溝槽n〇之内, 再填充一導電材料,如多晶矽、鎢、矽化鎢,於嵌壁式溝槽u〇以形 成甘欠壁式閘極118。於形成閘極介電層116之熱製程及/或其他後續製 程所發生的熱製程其間,隨之形成外擴散區域(outdiffUsi〇nregi()n) 122。 對深溝槽電容元件102之上部104、介電覆蓋層108、谈壁式閘 〇548-A5〇483-TWf/AU94〇43/Jyliu 6 -Ί300973 極118—之上部進行平坦化製程,接著,以選擇性濕式餘刻製程進行介 電覆蓋層108的移除以顯露深溝槽電容元件102之上部104及嵌壁式 閘極m之突出部⑽。此平坦化方法係包括化學機械研磨製程、^ 覆式回蝕刻、或凹蝕蝕刻製程。嵌壁式閘極118之突出部120的上表 面實質上係與深溝槽電容元件1〇2之上部刚為同等平面。 请參考第3圖,間隙壁m係形成於上部1〇4及突出部12〇之側 壁,如此一來,位於其上的間隙壁124間之空隙126則可自行對準, 其中間隙壁124可藉由沈積及對化學氣相沈積氮化秒薄膜進行乾式 回侧製程而形成。是以,間隙壁124乃圍住上部刚及突出部12〇, 且可以深溝槽電容元件1G2、嵌壁式電晶體112、及位於環形空隙 (circular spaces) 126外之間隙壁124覆蓋基底1〇〇,接著進行離子 佈植以於_式通道區域114之相反側及其環形空隙126下方 極/汲極區域128。 、 请參考第4圖及第5圖,一導電材料層,較佳為包含以摻雜之 多晶石夕或金屬,係形成於基底卿之上,並填充於間隙壁124間之空 隙126。其後’對導電材料層、間隙壁124、深溝槽電容元件ι〇2、 及嵌壁式閘極112進行平坦化製程以於間隙壁124間之空隙126内形 成埋入層130 ’如第4及5圖所示,此埋入層13〇鱗繞於深溝槽電 谷兀件102之上部1〇4。此平坦化方法係使用化學機械研磨製程、毯 覆式回蝕刻、或凹蝕蝕刻製程以達成。 第5圖顯示一俯視示意圖,其繪示於平坦化製程後的深溝槽電容 元件102之上部1〇4圖案、間隙壁124、埋入層13〇、及嵌壁式電晶 體112之突出部120。 請參考第5圖及第6圖,對間隙壁124、埋入層13〇、深溝槽電 容兀件舰、及散壁式閘極m進行圖案化製程以形成平行淺溝槽 〇548-A5〇483-TWf/AU94043 / Jyliu 7 •1300973 132,圖案化製程可藉由微影及蝕刻製程而達成。圖案化製種同時口 定義出主動區域136且製造隔離層以隔絕電晶體。平行淺溝槽13:係 接鄰深溝槽電容元件102及嵌壁式間極II2之圖案化邊緣區域。換句乎、 話說,此最終得到之間隙壁⑶及埋入層130係分別位於深溝槽電容 102及嵌壁式閘極112側邊之數個區域,因此,則形成圖案化之埋入 * 層13如及134b,且圖案化之埋入層134a係作為埋入插塞或埋入位元 . 線插塞。 介電材料層係形成於淺溝槽之内,介電材料可為藉由高密度電裝 , (HDP)製程沈積而得之氧化物以形成相關技藝所述之淺溝槽隔離結 構’最終,對介電材料進行平坦化以顯露上部1〇4、間隙壁124、圖 案化埋入層134、及突出部120。 雖然本發明已啸佳實施觸露如上,然其並非用以限定本發 明’任何熟習此技藝者,在不脫離本發明之精神和範圍内,當可作些 許之更動與潤飾,因此本發明之保護範圍當視後附之申請專利範圍所 界定者為準。
〇548-A5〇483-TWf/AU94〇43/Jyliu 8 *13*00973 【圖式簡單說明】 第1圖為-剖面示意圖’其繪示依據本發明之實施例所描述之欲 壁式溝槽的製造方法。 第2 _-剖面示意圖’其繪示依據本發明之實施綱描述具有 大出部之嵌壁式電晶體的製造方法。 第3圖為-剖面示意圖,其綠示依據本發明之實施例所描述以間 隙壁形成空隙的製造方法。
第4圖為-剖面示意圖,其繪示依據本發明之實施例所描述形成 埋入層(埋入位元線插塞)的製造方法。 第5圖為-俯視7F意圖,其繪示依據本發明之實施例所描述深溝 槽電谷元件、嵌壁式閘極、間隨、及埋人層之配置態樣。 第6圖為-俯視示意圖,其繪示依據本發明之實施例所描述淺溝 槽、圖案化深溝槽電容元件、圖案化嵌壁式閘極、圖案化嶋壁、及 圖案化埋入層之配置態樣。
【主要元件符號說明】 100〜基底; 104〜上部; 108〜介電覆蓋層; 112〜嵌壁式電晶體; 116〜閘極介電層; 120〜突出部; 124〜間隙壁; 128〜源極/汲極區域; 132〜平行淺溝槽; 136〜主動區域。 °548-A5〇483-TWf/AU94〇43/Jyliu 102〜深溝槽電容元件; 106〜塾層; 110〜嵌壁式溝槽; 114〜通道區域; 118〜散壁式閘極; 122〜外擴散區域; 126〜空隙; 130〜埋入層; 134a、134b〜圖案化埋入層;

Claims (1)

  1. I令年f月I β ;,:::乂楚X 期· 97年7月1日 1300973 第95100887號申請專利範圍修正本 十、申請專利範圍: 1.一種半導體元件的製造方法,包括: 提供一基底,其具有嵌壁式閘極與深溝槽電容元件,其中該 嵌壁式閘極之突出部與深溝槽電容元件之上部係露出於該/基底Y 於該上部及該突出部之侧壁形成間隙壁; ⑨該間隙壁間之間隙形成-由導電材料構成之複數埋入層; • 對該基底、該_壁、及該些埋人層進行圖案化以形成平0行 之淺溝槽結構進而定義出主動區;以及 , 於該淺溝槽結構内形成一介電材料層,其中一些埋入層係作 為埋入插塞。 2·如申請專利範圍第i項所述之半導體元件的製造方法,其 中該間隙壁係包括氮化矽。 3·如申請專利範圍第丨項所述之半導體元件的製造方法,呈 中該導電材料係包括多晶矽。 /、 4·如申明專利範圍帛J項所述之半導體元件的製造方法,其 中該間隙壁更進-步環繞於該深溝槽電容元件之上部周圍。 5·如申凊專㈣圍第i項所述之半導體元件的製造方法,盆 中該介電材料係包括氧化物。 /、 、6.如中凊專利範圍第i項所述之半導體元件的製造方法,其 中對該基底、該間隙壁、及該埋人層進行圖案化包括〆微影製程 及一姓刻製程。 -。如-申Μ專利範圍帛1項所述之半導體元件的製造方法,其 中該平仃/¾溝槽結構係形成於接鄰該深溝槽電容元件與該嵌壁 式閘極的圖案化邊緣。 8·如申請專利範圍第i項所述之半導體元件的製造方法,呈 中該埋人插塞係包括位元線插塞。 八 〇548-A5〇483.TWf/AU94〇43/Jyliu 10 1300973 第9駕887號精麵麵修正本 日期:97年7m日 9.一種半導體元件的製造方法,包括: 提供一基底,其具有嵌壁式閘極與深溝槽電容元件,其中該 後壁式閘極之突㈣與深溝槽電容元件之上部係露出於該基^ 於該上部及該突出部之側壁形成間隙壁; 於該基底上形成一導電材料層; • I該導電材料層進行平坦化製程以於該間隙壁間之間隙形 . 成複數埋入層; ^ 對該基底、該間隙壁、該些埋入層、該深溝槽電容元件、及 該喪壁式閘極進行圖案化以形成平行之淺溝槽結構進而 主動區;以及 於該淺溝槽結構内形成一介電材料層,其中一些埋入層係 為埋入插塞。 Θ ’、f 10. 如申請專利範圍第9項所述之半導體元件的製造方法, 其中該間隙壁係包括氮化矽。 11. 如中請專㈣圍第9項所述之半導體元件 其中該導電材料係包括多晶石夕。 12. 如申請專㈣圍第9項所述之半導體元件的製造方法, 其中該平坦化製程係包括化學機械研磨、毯覆式回 蝕刻製程。 ^凹蝕 13. 如申請專利範圍第9項所述之半導體元件的製造 其中該間隙壁更進-步環繞於該深溝槽電容元件之上部周圍。’ 14·如申請專㈣圍第9項所叙半㈣ 其中該介電材料係包括氧化物。 ]衣每方法, 15. 如申請專利範圍第9項所述之半導體元件的製 其中對該基底進行圖案化包括進行一微影製程及—钱刻呈。, 16. 如申請專利範圍第9項所述之半導體元件的製^方1。, ►548-A5〇483-TWf/AU94〇43/Jylii 11 1300973 第95100887號申請專利範圍修正本 日期·· 97年7月1日 其中該平行淺溝槽結構係形成於接鄰該深溝槽電容元 壁式閘極的圖案化邊緣。 瓜 17·如申請專利範圍第9項所述之半導體元件的製造方法, 其中該埋入插塞係包括位元線插塞。 18·—種半導體元件的製造方法,包括·· 山提供-基底,其具有後壁式閘極與深溝槽電容元件,其中該 -嵌壁式閘極之突出部與深溝槽電容元件之上部係露出於該基底 於該上部及該突出部之側壁形成間隙壁; | 於基底上形成一導電材料層; 對該導電材料層、該間隙壁、該深溝槽電容元件、及該嵌壁 ^閑極進行平坦化製程以於該間隙壁間之間隙形成複數埋入 曰,其中該些埋入層係圍繞該深溝槽電容元件之上部; 山對該基底、該間隙壁、該埋入層、該深溝槽電容元件、及該 2壁式閘極進行圖案化以形成平行之淺溝槽結構進而定義出主Λ 動區,以及 介電材料層,其中 些埋入層係fi 於該淺溝槽結構内形成 為埋入插塞。 19·如中請專利範圍第18項所述之半導體元件的製造方法 /、中該間隙壁係包括氮化矽。 料職_18韻叙半導^件的製造 其中該導電材料係包括多晶矽。 料職圍第18項所叙半導體元件的製造方法 ==域製㈣包括化學機械研磨、毯覆式回㈣、或㈣ 〇548-A5〇483-TWf/AU94〇43/Jyliu 12 1300973 第95100887號申請專利範圍修 23·如申請專利範圍第丨 、…日期:97年7月1日 其中該介電材料係包括氧化物、述之半導體元件的製造方法, 24. 如申請專利範圍 其中對該基底進行圖宰化勺、&之半導體元件的製造方法, 茶化包括一微影製程及一蝕列制护。 25. 如申請專利範圍第18 :衣耘 其中該平行淺溝槽# 半導體疋件的製造方法, 丁氏席糟、構彳請成於接鄰該深溝 •壁式閘極的圖案化邊緣。 谷兀件共該欺 26·如申睛專利範圍第18項所述之半導體元件 其中該埋入插塞係包括位元線插塞。 It万去,
    〇548-A5〇483-TWf/AU94〇43/Jyliu 13
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