TWI364095B - Finfet having improved carrier mobility and method of its formation - Google Patents

Finfet having improved carrier mobility and method of its formation Download PDF

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TWI364095B
TWI364095B TW092126057A TW92126057A TWI364095B TW I364095 B TWI364095 B TW I364095B TW 092126057 A TW092126057 A TW 092126057A TW 92126057 A TW92126057 A TW 92126057A TW I364095 B TWI364095 B TW I364095B
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substrate
layer
channel region
finfet
gate
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TW200414452A (en
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Ming-Ren Lin
Jung-Suk Goo
Haihong Wang
Qi Xiang
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Advanced Micro Devices Inc
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    • H01L29/00—Semiconductor 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
    • H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
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    • H01L29/76—Unipolar devices, e.g. field effect transistors
    • H01L29/772—Field effect transistors
    • H01L29/78—Field effect transistors with field effect produced by an insulated gate
    • H01L29/785—Field effect transistors with field effect produced by an insulated gate having a channel with a horizontal current flow in a vertical sidewall of a semiconductor body, e.g. FinFET, MuGFET
    • H—ELECTRICITY
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    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00—Semiconductor 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
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    • H01L29/06—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions
    • H01L29/10—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions with semiconductor regions connected to an electrode not carrying current to be rectified, amplified or switched and such electrode being part of a semiconductor device which comprises three or more electrodes
    • H01L29/1025—Channel region of field-effect devices
    • H01L29/1029—Channel region of field-effect devices of field-effect transistors
    • H01L29/1033—Channel region of field-effect devices of field-effect transistors with insulated gate, e.g. characterised by the length, the width, the geometric contour or the doping structure
    • H01L29/1054—Channel region of field-effect devices of field-effect transistors with insulated gate, e.g. characterised by the length, the width, the geometric contour or the doping structure with a variation of the composition, e.g. channel with strained layer for increasing the mobility
    • H—ELECTRICITY
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    • H01L29/42312—Gate electrodes for field effect devices
    • H01L29/42316—Gate electrodes for field effect devices for field-effect transistors
    • H01L29/4232—Gate electrodes for field effect devices for field-effect transistors with insulated gate
    • H01L29/42384—Gate electrodes for field effect devices for field-effect transistors with insulated gate for thin film field effect transistors, e.g. characterised by the thickness or the shape of the insulator or the dimensions, the shape or the lay-out of the conductor
    • H—ELECTRICITY
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    • H01L29/00—Semiconductor 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
    • H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
    • H01L29/66007—Multistep manufacturing processes
    • H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
    • H01L29/66227—Multistep 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
    • H01L29/66409—Unipolar field-effect transistors
    • H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
    • H01L29/66787—Unipolar field-effect transistors with an insulated gate, i.e. MISFET with a gate at the side of the channel
    • H01L29/66795—Unipolar field-effect transistors with an insulated gate, i.e. MISFET with a gate at the side of the channel with a horizontal current flow in a vertical sidewall of a semiconductor body, e.g. FinFET, MuGFET
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
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    • H01L29/00—Semiconductor 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
    • H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
    • H01L29/68—Types 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
    • H01L29/76—Unipolar devices, e.g. field effect transistors
    • H01L29/772—Field effect transistors
    • H01L29/78—Field effect transistors with field effect produced by an insulated gate
    • H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
    • H01L29/78603—Thin film transistors, i.e. transistors with a channel being at least partly a thin film characterised by the insulating substrate or support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
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    • H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
    • H01L29/68—Types 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
    • H01L29/76—Unipolar devices, e.g. field effect transistors
    • H01L29/772—Field effect transistors
    • H01L29/78—Field effect transistors with field effect produced by an insulated gate
    • H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
    • H01L29/78684—Thin film transistors, i.e. transistors with a channel being at least partly a thin film having a semiconductor body comprising semiconductor materials of Group IV not being silicon, or alloys including an element of the group IV, e.g. Ge, SiN alloys, SiC alloys
    • H01L29/78687—Thin film transistors, i.e. transistors with a channel being at least partly a thin film having a semiconductor body comprising semiconductor materials of Group IV not being silicon, or alloys including an element of the group IV, e.g. Ge, SiN alloys, SiC alloys with a multilayer structure or superlattice structure

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Description

1364095 玖、發明說明： 【發明所屬之技術領域】 本發明係有關於半導體裝置，更詳而言之，係關於垂 直雙閘極MOSFET，亦轉為FinfET。 【先前技術】 金屬氧化物半導體場效電晶體（MOSFET)係大部分半 導韙裝置之主要構件。習知的MOSFET係由半導體基板所 構成’該半導體基板中形成有數個摻雜物植入作用區。因 此，MOSFET作用構件係由半導體材料所圍繞。惟，當通 道長度小於1 0〇nm時’於MOSFET中使用半導體基板架構 會造成諸如短通道效應之性能降低的效果。由於圍繞著作 用區之半導體基板的半導體材料使源極和没極區域間互 動，因而產生短通道效應降低M〇SEFET閘極控制m〇sfet 通道區之導電性的能力。 一種代替習知半導體基板架構為絕亨層上^辱矽（s〇I) 架構。於SOI架構中，諸如M0SFET的裝置由電介質基板 支撐以單石基板（monolithic substrate)方式形成，而非以半 導體基板中的區域方式形成，已知s〇I裝置比使用半導體 基板架構所形成之裝置具有較多的優點，例如裝置間隔離 較良好、漏電流減少、CM0S元件間之鎖定Uatch_up)減少、 晶片電容減少、以及耦合於源極與>及極區域間的短通道減 少或免除。 有一種使用SOI架構形成之M〇SFET結構習知上稱^ 垂直雙閘極M0SFET，或FinFET。如第la圖所示，FinFE (修正本；)92428 5 1364095 由包含有源極區域〗、汲極區域14與鰭狀的通道區域16 之矽體所構成。源極區域12、汲極區域14與通道區域16 由單石石夕體所形成，該單石矽體由電介質基板18上的矽層 圖案化而來。將矽體圖案化後，於矽體上生成或沉積閘極 氧化物接著將如第lb圖所示之導電閘極2〇圖案化以圍 繞通道區域16。該導電閘極2G自諸如多⑽之導電材料 化而來。第2圖顯示第lb圖之FinFET之閘極和通道 區域沁線A-A’之剖面圖。如第2圖所示，閘極氧化物22 間隔開導電閘極2G與通道區域！ 6，導電閘極2()圍繞著通 iL區域16之兩側壁，因而作為雙閘極將閘極電壓分至通道 ，域16之兩側邊。FinFET之通道寬度因此約為通道區域 :度的兩倍’致使比相同尺寸之半導體基板廳則τ有更 高的驅動電流。 雖然習知的FinFET因為s〇I架構而比半導體基板形 成於上提供上述的好處，—些諸如載子移動性之 FmFET之基本特性與其他咖㈣相同，因為源極、沒 =通道區域通常㈣如⑦之習知刪啦半導體材料所 形成。 【發明内容】
FinFET : 根據本發明之實施例 (SiGe)層使FinFET基體圖 ，自將覆蓋於電介質層 案化，接著將應變矽磊 上的矽鍺 晶層形成 (修正本）92428 6 1364095 於石夕鍺FinFET基體上。由於放鬆的本質矽晶格（relaxed intrinsic silicon lattice)以及作為磊晶層生長之模板的矽 鍺晶格尺寸不同’因而使拉應變（tensile strain)施加於磊晶 石夕上。應變矽比放鬆的矽具有較高的載子移動性，因此受 應力的磊晶矽於FinFET中提供較高的載子移動性。所以 利用應變矽通道層於FinFET中可實現較高的驅動電流。 根據本發明之一實施例’絕緣層上覆石夕MOSFET裝置 包括有一具備電介質層之基板。將FinFET基體形成於電 介質層上。FinFET基體通常為矽鍺。FinFET基體包含有 源極和汲極區域’且通道區域延伸於源極和汲極區域之 間。將應變矽層形成於至少通道區域之表面上。將導體閘 極圍繞於通道區域兩側與上部分，並且由閘極絕緣層和應 變石夕使該導電閘極與通道區域分隔開。 根據本發明之另一實施例’絕緣層上覆矽MOSFET裝 置藉由首先k供包括有半導體層覆蓋於電介質層上之 基板所形成。該半導體層通常為矽鍺。將半導體層圖案化 而形成包括有源極和汲極區域以及於兩者間延伸有通道區 域之FinFET基體。接著於至少通道區域之表面上形成應 變石夕層1閉極絕緣層形成於至少生成在通道區域上的應 變石夕上a f蓋生成在通道區域上的應變石夕。形成導電間 極。導電閘極圍繞著通道區域之兩侧與上部分，並且由閘 極絕緣層和應變錢該導電閘極與通道區域分隔開。
根據本發明之又一實施例，可將複數個上述之^nFET 結合形成CMOS裝置 並可將FinFE 丁基體形成有複數個 (修正本）92428 7 通道區域，俾以提供更大的通道寬度 【實施方式】 又
第3圖十顯示根據本發明—實施例所形成之FinFET 閘極和通道剖面圖。由笸 田弟3圖可見，該結構包括有其上生 成遙晶應變碎層的發錯通j 吵銪逋迢&域32。由於晶格中有較大鍺 原子存在夕鍺通道區域32之#鍺晶格通常比本質的 石夕晶格間隔較寬。因切晶格的原子與分佈較寬的石夕錯晶 格對齊’於矽層中產生拉應變。將矽原子實質上彼此拉開。 施於矽晶格上的拉應變量隨矽鍺晶格中鍺的比例增加"斤 以，生成於錢通道區域32上㈣晶㈣34受到拉應變。 拉應變施於⑪晶格造成補電子帶六個之中的四個電子帶 能量增加，而兩個電子帶能量減少。由於量子效應，當電 子通過應變石夕的較低能㈣1際上重量減少百分之3〇。 因此較低能帶對電子流提供較少的電阻。另外，電子遭受 到來自碎原子核之的較少震動能量，㈣子比於放鬆的石夕 中的電子減少500至1000倍之散射速度。所以，相對於放 鬆的矽，應變矽中的載子移動性能大幅的增加，提供電子 移動性百分之80或更多的潛在增加，.電洞移動性百分之 2〇的增加。已知移動性之增加可持續到每公分15百萬伏 (megav〇its/centimeter)的電流場中。相信這些要素能不減 少裝置尺寸而增加百分之35的裝置速度，或不減低性能而 減少百分之25的電力消耗。 如第3圖更進一步顯示，將閘極絕緣層36形成於磊晶 矽層34上，而雙閘極結構38覆蓋於閘極絕緣層36上並圍 (修正本）92428 8 1364095 繞著矽鍺通道區域32形成。 因為應”層形成於通道區域以及源極和祕區域之 面，所以第3圖所示之結構形成顯出更好的載子移動性 之FinFET的部份。诵指+ Ai 的刀通道£域之剖面的寬高比可能越高越 好，俾以形成完全空乏且提供最大眚 促供琅大實際通道寬度之高 的通道區域。 乍 中說明根據本發明之一較佳實施 茲配合第4a至4c圖 例形成FinFET之過程。 第^圖顯示包括電介質層40和放鬆的石夕錯層42之 S〇1基板。7文將描述多種形成該基板之方式1鍺層4 較佳具有組成物Sii.xGex，苴中χ的笙执 X ，、甲X約等於0.2,且通常於〇 至〇·3範圍間。 _ 、用於蝕刻矽鍺層42之遮罩44形成於矽鍺層“上。該 遮罩最好為硬質遮罩（hardmask)，由使用類似形狀之光阻 遮罩作為蝕刻遮罩蝕刻雙層接構而成。 第4b圖顯示第4a圖經過使用遮罩44將未遮罩的石夕錯 移除後之結構，以形成矽鍺FinFET基體。 將磊晶應變矽層選擇性生長於矽鍺FinFET基體牝 上。應變石夕層最好使帛Si2H6作為來源氣體，以及 的分塵力與大約攝氏_至9⑽度之基板溫度的化學氣相 沉積所形成。因為矽原子經由點接至矽鍺晶格之對應的原 子齊於石夕曰曰格中產生力量使蟲晶石夕層形成時受應變。 在較佳實施例巾，遙晶應變梦具有⑽至細埃的厚度。. 於生成應變石夕層後，形成氧化石夕之閘極絕緣層於應變 (修正本）92428 9 1364095 矽層上。可藉由自應變矽層上沉積或選擇性生成該氧化 矽。應變矽層最後之厚度最好約為80至2〇〇埃。所以先 别生成之應變矽的量部分由是否於氧化物生成中消耗一肽 應變矽而定《>: ~ 於形成閘極絕緣層後，形成閘極48，得到如第圖 所示者。最好於基板以及矽鍺FinFET基體46上藉由沉積 多晶矽之保角層（conformal layer)，以形成該閘極，接著將 多晶矽層平面化，然後使用蝕刻遮罩圖案化並定義該閘極 48，如第4c圖所示。 於閘極48圖案化之後，可執行更進一步的製程，如於 閘極兩側壁上形成絕緣間隔體、於源極和汲極中植入摻雜 物、形成源極、没極和閘極石夕化物、以及於FinFET四周 形成保護層。 雖然參考第4a至4c圖所述之製程有關單一 FinFET 的製程，應了解可使用類似的製程方式實施多樣的代替結 構。例如，於一替代實施例中，一對以互補之摻雜物摻雜 之FinFET可具有電性連接的閘極以組成cM〇s FinFET。 於另一替代實施例中，FinFET之源極和汲極可藉由數個延 伸於其間之通道區域所連接，因此提供通道區域與閘極間 更多表面積接觸以及更大的通道寬度。 可用多種不同方式提供矽鍺SOI基板。第5a、5b、和 5c圖顯示於矽鍺基板中使用植入氧形成埋入氣化物 (buried oxide; BOX)層所形成之結構。如第5a圖所示，提 供矽鍺基板50。該基板通常包括有一層生成於石夕晶片上之 (修正本）92428 10 1364095 石夕錯。生成矽鍺的方式有例如，化學氣相沉積使用二矽烷 (Si#6)和鍺烷（GeH4)作為來源氣體、基板溫度攝氏6〇〇至 900度、30mPa的分壓力之ShH6，以及60mPa的分壓力之
GeH4。石夕鍺物質之生成可初步使用該等比例，或代替性的 可漸漸自低壓或零壓增加GeH4的分壓力，以形成傾斜的 構成。最好用來形成FinFET基體之矽鍺層之部分具有均 勻的構成。 如第5a圖所示’將氧52植入矽鍺基板50中，於足夠 能1時形成氧化區域（0Xygenated regi〇n)54在一能夠留下 所需厚度之石夕錯於氧化區域上之深度。 第5b圖顯示第5a圖之石夕鍺基板50退火後以形成埋入 矽鍺氧化物（silicon germanium oxide)層56於基板中之結 構°通常退火係在攝氏1350度下執行四個小時左右，且通 常作為放鬆任何矽鍺晶格中之應力。氧化物層56作為之後 將單石基板形成於其上之電介質層，如上所述。第5e圖顯 不第5b圖於圖案化矽鍺FinFET基體58(通道區域之剖面 所不）以形成覆於氧化物層56上的矽鍺層後之結構。 第6a至6d圖顯示根據形成矽鍺s〇I基板之第二方法 所形成之結構。第6A圖顯示平面化之矽鍺基板6〇。將氫 62植入矽鍺基板60以於矽鍺材料中形成富含氫區域 (hydrogen rich regi〇n)64。用一能量將氫62植入矽鍺基板 60，使留在备含氫區域之矽鍺的量超過將形成於s〇i基板 上之矽鍺層之厚度。較佳方式為將氫植入矽鍺之受應變之 區域。 & (修正本）92428 11 1364095 第6b圖顯示第6a圖之矽鍺清理乾淨、於稀釋之HF 溶劑中剝除氧化物、用除去離子之水沖洗以在矽鍺表面上 形成動態天生的氧化物、然後反向並接合（b〇nding)於第二 基板70之半導體層74之上之結構。可在室溫下進行接合， 且對於黏接袁佳化，兩基板需要精準的平面化以提供最大 接觸面積。 在接合.後’將接合的基板退火’例如於攝氏6〇〇度的 溫度下大約三小時。如第6c圖所示，退火使矽鍺基板沿著 富含氫區域64斷裂，因此留下包含有黏接一氧化物層72 之矽鍺層76之新的基板，並且在基板上表面具有剩餘的富 含風區域64 〇 接著將新的基板平面化並清洗，留下如第6d圖所示之 石夕鍺SOI基板，可由該基板上之矽鍺FinFET基體如前述 般圖案化。 第7圖描述包含較佳實施例、前文之代替例、以及其 他形成SOIMOSFET裝置之製程。首先提供SOI基板（步 驟80)。該SOI基板包含有覆於電介質層上之半導體層。 該半導體層最好為矽鍺，而該電介質層最好為矽鍺氧化物 或石夕氧化物。接著將半導體層圖案化以形成包括有源極和 没極區域以及其間延伸有通道區域之FinFET基體（步驟 82)。然後將一層應變矽形成於至少通道區域上（步驟84)， 但可添加地將應變矽形成於整個FinFET基體之表面。將 閘極絕緣層形成於至少生成於FinFET基體之通道區域的 應變石夕上以覆蓋通道區域上生成之應變矽（步驟86)。閘極 12 (修正本）92428 絕緣層可4自應變矽生成而來的氧化物或沉積於應變矽 形成導電閘極（㈣88)。該閘極環繞著區域通道之侧 壁/、上部77 ϋ且藉由閘極絕緣層以及應變石夕層使該閉極 與通道區域分開。如上述，可用該製程形成多種結構實施， 匕括第4“C圖所示之單-裝置、以及CMOS裝置、具有 多個區域通道之裝置、以只4 &使用不同材料成分與材料層結 構之裝置。 卜如本文中所述之含括應變矽之結構亦 可由替代方法所實施，如於半導體FinFET基體上之石夕鍺 層之生成，❹FinFET基體之錯楂人，接著在·ετ基 體，表面上之梦錯晶格中生成應變石夕。更進一步，可藉由 將喊植入梦FinFET其主 土 之表面形成應變矽。所以，根據 =明中應minFET之特徵為具有形成於至少…聰 基體之通道區域上的應詩層。通常，❿耐基體於至少 其通道區域之表面上包括一層矽鍺。 於另外代替實施例中，可藉由植入鍺至支樓的氧化物 層中來擴展氧化物層，肖以增加半導體層之應力。在又 貫施例t ’可使用_鍺具有晶格μ之高^料作為間 極絕緣層以提供額外的支援給應㈣層中之應變。 對熟悉該項技藝者可輕易 苴他方—-^ 百易了解上述中之製程並不限制 ，、他方式，而疋根據將形成之特定結構可將另 括到上述的製程中。例如，如在製造步驟之間形成= 純態層或保護層之中間製程'形成與移除光罩和 ^ 層、推雜與反摻雜（—^Ping)、清潔、平面化、= (修正本）92428 13 1364095 其他的步驟，可盥 不需要在一整L之特疋製程一起執行。另外，製程 整片的基板上如整偏B H U虹 裏程 某部分上選擇性 Β曰片上執行，亦可在基板 實施例為最佳例孚. …、圖中與上文所描述之 發明並不限於笨# ~ # Μ等貫施例僅為例示性。本 以及變形而落入本發 申至各種更改，合併’ 【圖式簡單說明】 -均等物範圍内。 第la圖顯示傳統FinpET基體的一部份； 、第®顯不形成於第la圖所示之傳統FinFET基體 部份上閘極的部分； 第2圖顯示傳統FinFET沿著a_a，線之問極和通道剖 面圖； 第3圖顯示根據本發明一實施例所形成之FinFET之 FinFET閘極和通道剖面圖； 第4a圖顯示之一基板和遮罩用於形成根據本發明之 一實施例之FinFET ; 第4b圖顯示第4a圖於蚀刻基板後以形成FinFET基 體之結構； 第4c圖顯示第4b圖形成閘極後的結構； 第5 a圖顯示將氧植入矽鍺基板； 第5b圖顯示.第5a圖經過退火後以形成矽鍺SOI基板 之埋入氧化物（BOX)層之結構； 第5c圖顯示第5b圖在從矽鍺層使FinFET基體圖案 化後之結構； 14 (修正本）92428 丄 第6&圖顯示將氫植入石夕錯基板； 第6 b圖忽e _ , 頌示將第6a圖翻轉而接合於第二基板之氧化 物層後的結;^ . 顯示第6b圖經過退火後以使植入氫區域的第 一基板斷裂之結構； 第6d圖顯示第6c圖經過平面化後以形成石夕鍺s〇i基 板之結構；以及 [ 第7圖顯示較佳以及替代實施例之流程圖。 主要元件符號說明】 12 源極區域 14 汲極區域 16 通道區域 18 電介質基板 20 導電閘極 22 閘極氧化物 32 石夕錯通道區域 34 磊晶矽層 36 閘極絕緣層 38 雙閘極結構 40 電介貧層 42、76 衫鍺層 44 遮罩 46 FinFET基體 48 閘極 50、60 矽鍺基板 52 氧 54 氧化區域 56 氧化物層 58 矽鍺FinFET基體 62 氫 64 富含氫區域 70 第二基板 72 氧化物層 74 半導體層 80、82 、84、86、88 步轉 15 (修正本）92428

Claims (1)

1364095 .. ........ ... ——.— —士fi年月％鼻t修(泉)正f 第92126057號專利申請案 ^ (99 年 1〇 月 28 日） 拾、申請專利範圍： 1· 一種絕緣層上覆矽（SOI)MOSFET裝置，包括： 具有電介質層（40)之基板； 矽鍺FinFET基體（46)，形成於該電介質層（40)上， 該矽鍺FinFET基體（46)包括源極和汲極區域於該等源 極和汲極區域具有延伸於其間之通道區域； 應變矽層（34)，形成於該矽鍺FinFET基體之至少 該通道區域之側壁以及上表面上； 閘極絕緣層（36)，形成於至少該通道區域上以覆蓋 形成於該通道區域之表面上之該應變石夕層（34);以及 導電閘極（48) ’圍繞著該通道區域之側壁以及上部 分’並且藉由該閘極絕緣層與該應變矽層將該導電閘極 與該通道區域分隔開。 2.如申請專利範圍第1項之裝置，其中，該矽鍺FinFET 基體（46)包括第一 FinFET基體，以及其中，該裝置中 復包括： 第二FinFET基體，形成於該電介質層上，該第二 FinFET基體包括第二源極和汲極區域，該等第二源極 和没極區域具有延伸於其間之第二通道區域； 應變矽層’形成於該第二通道區域之表面上； 問極絕緣層，形成於至少該第二通道區域上以覆篕 形成於該第二通道區域之表面上之該應變矽；以及 第一導電閘極’圍繞著該第二通道區域之側壁以及 上部分’並且藉由該閘極絕緣層與該應變矽層將該第二 16 (修正本）92428 第92126057號專利申請案 (99年1〇月28日） 導電閘極與該第二通道區域分隔開，而且該第二導電閘. 極與圍繞著該第一 FinFET基體的該通道區域之該導電 閘極電性連接， 該第一 FinFET基體之該源極和汲極以第一摻雜物 摻雜，並且該第二FinFET基體之該源極和汲極以與該 第—摻雜物互補之第二摻雜物摻雜。 3·如申請專利範圍第1項之裝置’復包括間隔體，形成於 該導電閘極之侧壁上。 4.種开> 成絕緣層上覆矽（SOI)MOSFET裝置之方法，包 括下列步驟： 提供包括覆蓋於電介質層上之半導體層（42)的s〇I 基板（40); 將該半導體層（42)圖案化以形成包括有源極和汲 極區域之矽鍺FinFET基體（46)，該等源極和汲極區域 具有延伸於其間之通道區域； 形成應變矽層（34)於至少該通道區域之側壁以及 上表面上； 形成閘極絕緣層（36)於至少生成在該通道區域上 之該應變>5夕（34)上，以覆盍在該通道區域上之該應變石夕 (34);以及 形成導電閘極，該導電閘極圍繞著該通道區域之側 壁以及上部分，並且藉由該閘極絕緣層（36)與該應變矽 層（34)將該導電閘極與該通道區域分隔開。 5.如申凊專利範圍第4項之方法，其中該矽鍺FinFET基 (修正本）92428 17 1364095 第92126057號專利申請案 (99年10月28日） 體（46)包括第-FinFET基體，而且其巾，該.方法復包 括下列步驟： 與該第—FinFEH «案化同時進行該半導體 層之圖案化，以形成包括第二源極和沒極區域之第二 Fin雨基體，該等第二源極和❹區域具有延伸於其 間之第二通道區域； 形成一層應變矽層於該第二FinFET基體之至少該 第二通道區域之表面上，與生成應變矽層於該第一 FinFET基體上同時進行； 形成閘極絕緣層於至少生成在該第二FinFET基體 ，該第二通道區域上的該應變矽上，以覆蓋生成在該第 二通道區域上之該應變矽’與形成導電絕緣層於該第一 FinFET基體上同時進行；以及 形成第二導電閘極圍繞著該第二通道區域之側壁 =上部分，並且藉由該間極絕緣層與該應變石夕將該第 :於^極t該第二通道區域分隔開’與形成該導電閘 極於該第一 FlnFET基體上同時進行， .其中該第- FinFET基體之該導電閑極與二 FlnFET基體之該導電閘極電性連接。 6.如申請專利範圍第4項之方法，其中，該石夕鍺η咖丁 基體（46)具有至少延伸於該源極和及極區域之間的第 -和第二通道區域。 間的第 7·如申請專利範圍第4項之方 雷介晳, 丁死1，、已括覆蓋於 電"質層上之半導體層之S0I基板包括： (修正本）92428 18 1364095 第92126057號專利中請案 (99年10月28日}' 提供包括矽鍺層之基板； 將氧植入該矽鍺層中；以及 將該基板退火以形成埋入矽鍺氧化物層於該矽鍺 層申。 8.如申請專利範圍第4項之方法，其中，提供包括覆蓋於 電介質層上之半導體層之SOI基板包括·· 提供包括矽鍺層之第一基板； 將虱植入該石夕·鍺層中以於該石夕鍺層中形成富含氫 區域； 將該第一基板接合至第二半導體基板之氧化物層； 將該接合之第一和第二基板退火使該富含氫區域 中之該第一基板斷裂；以及 移除該第一基板以形成具有石夕緒層接合於該氧化 物層之該第二基板。 19 (修正本）92428 1364095 修正 Mii> 8/8
第7圖 1364095 柒、指定代表圖： (一） 本案指定代表圖為：第（5c )圖。 (二) 本代表圖之元件代表符號簡單說明： 捌、本案若有化學式時，請揭示最能顯示發明特徵的化學式: 50 矽鍺基板 56 氧化物層 58 矽鍺FinFET基體 4 (修正本）92428
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