TW200941557A - Susceptor for vapor phase epitaxy and vapor phase epitaxy apparatus - Google Patents

Susceptor for vapor phase epitaxy and vapor phase epitaxy apparatus Download PDF

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TW200941557A
TW200941557A TW097146643A TW97146643A TW200941557A TW 200941557 A TW200941557 A TW 200941557A TW 097146643 A TW097146643 A TW 097146643A TW 97146643 A TW97146643 A TW 97146643A TW 200941557 A TW200941557 A TW 200941557A
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outer peripheral
wafer
phase growth
peripheral portion
gas phase
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Takeshi Nishisawa
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Shinetsu Handotai Kk
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    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C16/00Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/44Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
    • C23C16/458Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for supporting substrates in the reaction chamber
    • C23C16/4581Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for supporting substrates in the reaction chamber characterised by material of construction or surface finish of the means for supporting the substrate
    • CCHEMISTRY; METALLURGY
    • C30CRYSTAL GROWTH
    • C30BSINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B25/00Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
    • C30B25/02Epitaxial-layer growth
    • C30B25/12Substrate holders or susceptors
    • 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
    • H01L21/67Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
    • H01L21/683Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
    • H01L21/687Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches
    • H01L21/68714Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support
    • H01L21/68735Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support characterised by edge profile or support profile
    • 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
    • H01L21/67Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
    • H01L21/683Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
    • H01L21/687Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches
    • H01L21/68714Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support
    • H01L21/6875Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support characterised by a plurality of individual support members, e.g. support posts or protrusions

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Mechanical Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Vapour Deposition (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)

Description

200941557 六、發明說明: 【發明所屬之技術領域】 本發明係關於在藉由氣相成長的磊晶矽晶圓的製造 中,用以載置單晶矽基板的氣相成長用承受體(基座)、以 及具備此的氣相成長裝置。 【先前技術】 〇 先前,已知有於單晶矽基板(以下,有簡稱為晶圓的 情況)的主表面上氣相成長矽磊晶層(以下,有簡稱為磊 晶層的情況)’以製造磊晶矽晶圓(以下,有簡稱為磊晶晶 圓的情況)的方法。 如此的磊晶晶圓的製造,係一邊加熱配置於反應容器 内的晶圓,一邊供給矽原料氣體至該晶圓的主表面上,藉 由使蟲日日層氣相成長而進行。 ❹ 一般地,晶圓係一邊保持於設有柱坑部(凹部 (counterbore))的承受體上,一邊被加熱,但有於承受體的 柱坑底面形成網狀圖樣的溝的情況(日本專利公開公報特 開平8-8198號)。形成溝的主要目的係形成氣體的通路, 除了防止載置晶圓時發生位置偏移之外,也有在取出晶圓 時容易從承受體取出的效果。 但是,網狀圖樣的溝的形狀,會對於晶圓載置時的彎 曲、Ba圓外周部的溫度降低、背面外周部的矽的堆積等之 磊晶晶圓的品質造成影響。 200941557 晶圓的栽而言’單片式的反應裝置中,為了提高生產率, 推"置係於承受體的溫度為400°C〜90(TC的高溫的狀 :劇地:此時’因為原本是室溫的晶圓’於承受體上被 加熱時的彎曲15mm的彎曲。與上述通常 的零曲相較’晶圓載置時的彎曲係100倍以上極大 距,而有因晶圓背面中心與承受體接觸而發生傷痕、 :是晶圓與晶圓載置用的移載機具接觸而發生傷 1外’形成有網狀圖樣的溝的承受體,若與無溝的承 "較’有晶圓外周部的溫度容易降低的傾向。若晶圓 的溫度降低,則外周的爲晶層的膜厚容易變薄,而 成為B曰圓面内的膜厚分布惡化的原因。 另外’進入晶圓背面與承受體之間的矽原料氣體,於 曰曰θ的背面堆積,有平坦度惡化的情況(參照第4圖)。特 別疋對於在其背面已形成有氧化膜的晶圓,要進行除去背 面:最外周部的〇.5〜 lmm的氧化膜的處理(團塊處理), 但是因為石夕會集中堆積於氧化膜除去處理部分,此時 垣度會更加惡化。 【發明内容】 本發明係有鑑於上述課題而開發出來, _ ^ 八曰的係: —種氣相成長用承受體以及具備此的氣相成長裝置, 改善··因晶圓外周部溫度降低所造成的膜厚降低、晶 200941557 置時的彎曲、晶圓背 用以達成上述目的本發明,係積J的問題。 體,其係於用以在晶圓表面氣相成長種氣相成長用承受 中,用以支持晶圓的承受體 :膜的氣相成長裝置 成可收容晶圓的柱坑部,在該柱坑部=在該承受體,形 樣的溝形成多數個方形凸 、 底面,藉由網狀圖 的溝深度,較令央部淺。 上述柱坑部底面的外周部中 ❹ ❹ 如此,針對於載置晶圓的柱 的溝形成有多數個方形 。纟面’藉由網狀圖樣 坑部底面皆同樣, 又體,若溝深度並非於柱 度較中央部I相=柱坑部底面的外周部中的溝深 的溫度降低所造成的膜厚降:受=可防止晶圓外周部 晶圓背面外周部的矽堆積 ::圓載置時的彎曲、 . 了传到南品質的磊晶晶圓。 另外’從上述中央部至p、+、m 化,係連續地變淺為較佳。”發生的溝深度的變 =此針對上述氣相成長用承受體,若從晶圓載置面 就是柱坑部底面的中央部至外周部所產生的溝渫度的變 化,係連續地變淺,則於中央部與外周部的交界部,不會 因心劇地/皿度變化而發生遙晶層的膜厚急劇地變化的可 能可防止奈米形貌、SEMI規格的平坦度的定義之一的 ° P 平;L· 度(Site flatness least square range ; SFQR)惡化, 而可得到高品質的磊晶晶圓。 另外’較佳為:上述柱坑部底面的外周部中的最淺的 4冰度,在於〇 〇1〜〇 〇8mm的範圍,較上述外周部更内侧 5 200941557 的中央部申的最深的溝深度, 如此,㈣" 〇.5_的範圍。 如此針對上述氣相成長用承受體 面的外周部令的最淺的溝深度,俜在001 〇 部底 圍,較上述外周部更内側的中央 在〇」〜〇.5mm的範圍,則可 ’、 改盖晶圓北&冰田 日日圓的外周部溫度降低、 曲圓月面外周部的石夕堆積,且可防止晶圓的滑移、f ❹ ❹ 另外,較佳為:上述外周部 心圓站,+ t 與迹中央部的交界係同 ^圓狀’上述外周部的領域 域係攸上述柱坑部底面的外周端 算起10mm〜50mm的範圍。 ^此針對上述氣相成長用承受體,若晶圓載置面也 坑部底面的外周部與十央部的交界係同心圓狀,上 ^卜周P的4域係從上述柱坑部底面的外周端算起醜 50mm的範圍,則可改善載置在承受體時的晶圓的滑移、 彎曲’而可得到均勾性優良的蟲晶晶圓。 另外,上述承受體較佳係由石墨製的基材以碳化石夕被 覆而成者。 如此’上述氣相成長用承受體,若是由石墨製的基材 以碳化石夕被覆而成纟,則可為生產良率高、難以放出不純 物’且熱傳導性、耐久性優良的高品質的承受體。 另外’本發明係提供-種氣相成長裝置,其係至少具 備上述的氣相成長用承受體。 、如此,方疋至少具備上述的氣相成長用承受體之氣相 成長裝置則可防止因晶圓外周部的溫度降低所造成的膜 200941557 :降低’、改善晶圓栽置時的-曲、晶圓背面外周部的石夕堆 ^成為可侍到向品質的磊晶晶圓之氣相成長裝置。 右依本發明,針對於晶圓載置面具有藉由網狀圖樣的 溝而形成的多數個方形凸部之氣相成長用承受體 度並非於晶圓載置面皆同樣,而為外周部較中央部淺,藉 此’可防止因晶圓外周部溫度降低所造成的膜厚降低,改 善晶圓載置時的弯曲、晶圓背面外周部的梦堆積, ❹ ❹ 【實施方式】 於此 以下’說明關於本發明的實施形態’但本發明不限定 先前,對於在柱坑底面形成有網狀圖樣的溝之承受 體’有因晶圓外周部的溫度降低而引起的膜厚降低、晶圓 載置時的弯曲、晶圓背面外周部的石夕堆積等的問題。 為了解決上述課題,本發明者對於各種承受體的網狀 圖樣的溝的形狀,關於载置時的晶圓㈣曲與晶圓的外周 溫度降低量、以及晶圓背面部的料積量,進行檢討。其 結果發現,針對在其心載置晶”柱坑部底面具㈣^ 網狀圖樣的溝而形成的多數個方形凸部之蟲晶♦晶圓的製 造:承受體,藉由採用其外周部較中央部淺的承受體,而 不是採用如先前的承受體般的溝深度於晶圓載置面中皆是 相同的承受體’便可改善:0晶圓外周部溫度降低而造成 的膜厚降低、晶圓載置時的彎曲、晶圓背面外周部的料 200941557 積等的情況。因此,可謀炎故盖否a a , J咮求?文唇备晶層的面内均勻性、抑 制基於彎曲而發生的傷濟、b圓番a , 旧揚痕、日日圓I面的堆積的改善,而能 夠提高平坦度等。 以下,參照圖式來說明本發明的實施形態,但本發明 不限定於此。 ❹ ❹ 首先’第1圖係表示本發明之氣相成長用承受體的一 例的圖。 第1圖(a )所不,承受體1係例如大約形成圓盤狀’ 在其主表面形成用以收容晶圓於該主表面上的俯視大約為 圓形的凹部也就是柱坑部2。另外,如第i圖(心、⑴ 所示,在柱坑部底面3上,設有網狀圖樣的溝以作為氣體 通路’並形成多數個方形凸部6。另外,上述承受體i,其 柱坑部底面的外周部4的墦..签痒 ^ ^ (參照第…:㈣’較中央部5的溝深度淺 圖檨第1圖(C)、(d)係上述承受體1中的由網狀 2 f所形成的方形凸部6的擴大圖,此溝係以0.6〜 2mm的間距形成(參 凸邱“ 芩…、第1圖(°),破此溝包圍而形成的 凸=頂面較佳為邊長一一的正方形(參照" 生位置I:且:此網狀圖樣的溝,除了防止栽置晶圓時發 的效果。之夕’也有在晶圓取出時容易從承受體1取出 生:溝:二=受體1中,從中央部5至外周部4所產 J再/术度的變化,較佳係嬙 係連續地變淺。從中央部至外周 200941557 部產生的溝深度的變化,若為連續,則於交界部不會有急 劇的’皿度變化’可防止磊晶層的膜厚急劇地變化,而能防 止奈米形貌、局部平坦度(SFQR)惡化。為了避免如此的品質 惡化,溝深度的變化,較佳係作成連續地變化。 晶圓外周部的溫度降低,係與溝的深度 深溫度下降越大的傾 貝肖另外’背面的料積,亦有溝越 Φ ❹ 了-二二的傾向,外周部中的溝深度越淺為較佳,但 而形成淺的溝,則氣體的通路不會阻 此,柱坑部底面的外^二 移的顧慮。因 〜。_。8_的範圍:上:二淺的溝深度’是在0·。1 悬π的墦 乂上述外周部4更内側的中央部5中 最-的溝深度’較佳是在〇1〜〇 5_ 的承受體’可防止晶圓外周 ^如此 積,且可防止晶圓的滑移、f曲。 改。者面的石夕堆 另外,上述承受體i中,柱 央部5的交界係同心圓狀,"、…的外周4與中 從上述柱坑部底面二二=卜^4的領域,較佳是 扪卜周端算起l〇mm〜 5〇mm B曰圓栽置面的溝越深,向承受體載置時曰 移、管曲,越有改善。因此二載置時的晶圓的滑 中央部的面積以較廣為佳。溝較深的 則溝較淺的外周部、邛的面積過廣, =低、背面外周部的石夕堆積量增加等^外周部的溫 周部的領域,較佳^問題。因此,外 〜5。咖的範圍。另坑部底面的外周端算起! 外,因外周部與中央部的交界為同心圓 200941557 狀,可製造面内均勻性優良的磊晶晶圓。 另外,上述承受體1的構成材料,較佳是採用以石墨 為基材,並被覆碳化矽膜而成者。基材以採用石墨為較佳 的原因,係因與開發當初的氣相成長裝置的加熱方式的主 流為高周波感應加熱相關連’除此以外,亦有容易取得高 純度品、加工容易、熱傳導性優良、難以破損等的優點。 但是,由於石墨係多孔質體,在製程中有放出吸藏氣體的 可能性’另外’有在氣相成長的過程中,石墨與原料氣體 反應,承受體的表面變化為碳化矽等的問題。因此,最初 將表面被覆碳化矽的被覆膜的構成係一般化。此碳化矽的 被覆膜通常係藉由化學氣相成長法(CVD)來形成50〜200 // m的厚度。 接著,第2圖中表示本發明之氣相成長裝置的一例。 如第2圖所:,氣相成長裝置u係具備:由透明石英所構 成的反應谷"1 2,以及設於及雇交^ έΛ rtn A. 參 、夂應合益的内部,將矽基板(晶 圓)w支持於其頂面上的承受冑13。此氣相成長裝置u 中所具備的承受體丨3係依據本發明的承受體,例如 用第1圖所示的承受體1。 反應容器121有氣相成長用氣體導q 14,用 包含原料氣體(例如三氯碎烧)以及載體氣/ 的氣相成長用氣體,導入反應容器12 歹,虱氣) 領域,而供給至承受體上的晶圓的主表面内:受體的上侧的 應容器的設有氣相成長用氣體導入管料,於反 洗氣體營〗S 目同御丨’設有沖 洗虱體管1 5,用以將沖洗氣體(例如 τ ;)導入反應容器 200941557 中的承受體的下側的領域。 再者’於反應容器的設有氣相成長肖氣體導入管與 洗氣體導入管側的相反側,設有排氣管 :, α _ 用以將反應容 器内的氣體(氣相成長用氣體以及沖洗氣體)排氣。 反應容器的外部,設有從上側與下側加熱反應容器ι 的複數個加熱裝置17a、17b。作為加熱裝置,例如可舉 ❹ 鲁 齒素燈等。又,隨意地設定了加熱裝置的數量,但 並無限制。 —数量 另外,承受體u的背面,設有用以支持承受體η 承受體支持構件18,此承受體支持構件係可往上下方向蒋 動’且可旋轉。 "移 另外,採用包含如上所述的本發明之氣相成長用承受 體之氣相成長裝置U,可藉由以下的方法 曰Β TS1 、 心辟日日日曰 圓。最初’將晶圓W投入至Ρ,敕或4 。 _ 仅八主匕調整為投入溫度(例如65〇 C)的反應容器12内,其主表面6卜 番 、录面向上而載置於承受體頂面 的柱坑部13a上。在此,從投入曰圓 a 仅八日日圓W的刖階段,分別經 由氣相成長用氣體導入管14以及沖洗氣體管Μ,將氫氣 導入反應容器12中。接著’承受體13上的晶圓,藉由加 熱裝置17a、17b加熱至氫氣熱處理溫度(例如⑴〇〜⑴〇 C )為止。 接著,進行用以除去於晶圓W的纟 、 圓…的主表面上所形成的自 然氧化膜的氣相姓刻。又,士卜名4 J 此軋相蝕刻,具體地,係進行 至次一製程也就是氣相成長之前為止。 接著’將晶圓W降溫至預定的成長溫度(例如刪〜 200941557 1150°C)為止,分別經由氣相成長用氣體導入管14, %晶 圓表面W的主表面上,大約水平地供給原料氣體(例如三 氯矽烷),並經由沖洗氣體導入管15大約水平地供给沖洗 氣體(載體氣體··例如氫氣),藉此,於晶圓w的主表面 上氣相成長磊晶層’來製造磊晶晶圓。又,沖洗氣體係以 較原料氣體更高壓时式來進行H此料了原料氣鐘 從反應容器與承受體13之間的間隙進入下側的空間。 ❹ 最後,將磊晶晶圓降溫至取出溫度(例如650。匸)為止, 然後搬出反應容器12外。 、如此,若利用具備本發明之氣相成長用承受體之氣相 成長裝置來製造磊晶晶圓’則於晶圓載置面具有以網狀圖 樣的溝而形成的多數個方形凸部之氣相成長用承受體中, 因溝深度於晶圓載置面並非同樣,而為外周部較中央部 淺’藉此可改善基於因晶圓外周部溫度降 膜厚 降低而導致的遙晶層的膜厚均⑽的劣化的膜厚 沾镞1 的劣化、因晶圓載置時 的彎曲所造成的傷痕發生、因晶 a T U日日圓貪面外周部的矽堆積所 地成的平坦度的惡化等的問題。 以下’例舉本發明的實施例 , ^ I關比較例,更具體地說明, 但本發明不限定於此。 (實施例、比較例) 製作第3圖所示的形狀 例1、7 q„ 又體I作為實施例卜比較 、3,並採用這些承受體 (a )植止二也山 个衣知·為日日日日圓。第3圖 )係先則形狀的氣相成長用 又骽其柱坑部底面的溝 12 200941557 深度全面-律是〇.lmm (比較例υ。另外,如第3圖⑴ 所示的承受體係全面一律是0 02mm(比較例2)。再者, 如第3 ® (〇所示’製作出其溝深度係至柱坑部底面的直 徑180mm為止的中央部領域為〇 lmm,較直徑i8〇mm更 外側為無溝的形狀的承受體(比較例3 >另外,如第3圖 (c〇所示,製作出具有柱坑部底面的溝深度係至直徑 180_為止的中央部領域為〇 lmm,從此處開始向外周側 ❹傾斜地變化成〇·〇2_(逐漸地變淺)的形狀的承受體(實施 例1 )。 又上述實知例1、比較例1 — 3中的各承受體,係統 一地設為:碳化矽的被覆的厚度係1〇〇/im、柱坑直徑係 208mm、網狀的間距係〇 7mm、溝的寬度係〇 。 (1 )外周溫度降低的概算 首先,另外準備直徑200mm、電阻率1 〇 q · cm、主表 面的面方位<100>的P—型矽晶圓,並經離子植入n型不 β純物之鱗而成者,來作為溫度評價用的試驗用晶圓。此離 子植入係以離子加速能量5〇〇KeV、劑量3 〇χΐ〇14/^2來 進行對於經離子植入之試驗用晶圓,利用已知溫度特性 的熱擴散爐,施以3〇分鐘熱處理之後,測定薄片電阻,預 先製作檢定線,以可根據薄片電阻來換算處理溫度。 接著,採用實施例1、比較例i—3的承受體,將與經 述離子植入之化度3平價用的試驗用晶圓相同處理後的評 價用BB圓以預定溫度熱處理3 0分鐘後,以四短針測定器 測定薄片電阻,使用預先得到的檢定線來換算溫度。薄片 13 200941557 電阻的測定位置係距晶圓的外周端5mm與距外周端〗 的位置’箅出其差值來作為溫度降低量。 另外,採用上述的實施例1、比較例i — 3的承受體以 及具備此的氣相成長裝置,對直徑200mm、p型、結晶方 位<1〇〇>、背面CVD氧化膜厚度5〇(^m的晶圓施:團曰塊 處理之後,使未摻雜的磊晶層成長厚度7〇/Wm,分別製作 出遙晶晶圓。 ❻採用實施例1、比較例1 — 3的承受體製作出來的磊晶 晶圓的品質,以(2 )背面外周部矽堆積量測定、(3 )因晶 圓載置時的彎曲所造成的傷痕不良、(4 )晶圓載置時的滑 移之四種態樣的評價方法來評價。 (2 )背面外周部矽堆積量測定 因石夕未堆積於背面CVD氧化膜上,矽係從團塊處理部 起堆積’因此測定從CVD氧化膜起的團塊處理部的高度曲 線。 © (3)因晶圓載置時的彎曲所造成的傷痕不良 遙晶成長後’將晶圓進行鹵素燈下外觀目視檢查,檢 查傷痕的有無。 (4 )晶圓載置時的滑移 在常溫的狀態下,藉由目視檢查將晶圓載置於承受體 上時,晶圓是否於柱坑部内滑移來評價。 將採用上述的實施例1、比較例1 — 3的承受體而進行 的外周溫度降低的概算結果、以及採用實施例1、比較例丄 ~ 3的承受體製作出來的磊晶晶圓中的品質評價的結果, 200941557 表示於第1表。 第1表 溝深度 晶圓外周 溫度降低 背面外周部 矽堆積量 因晶圓載置時 的彎曲所造成 的傷痕不良 晶圓載置 時的滑移 其他的 品質 比較例1 全面一律為 O.lrnin -1.6°C 7.0μιη 無 無 比較例2 全面一律為 〇.〇2mm -0.5°C 3.5μιη 有 有 比較例3 "~~--- t 央部:0.1mm 外周部:無溝 -0.2°C 3.4μιη 鱼 #»*> _— 有 於交界 部有膜 厚段差 實施例1 — 中央部:0.1mm 外周部:0.02〜 g-Imm (傾斜狀)_ -0.4°C 3.5μιη 無 -----—-- 無 m乐1表,採用實施例1、 出央沾石 贷"比較例2、3的承受體絮 ❹ 低量:晶圓與比較例1相較’成為晶圓外周溫度的 低量小、背面外周部的石夕堆積 枉坑部底面全面形成一律為 ::[方面’ 體的情況,晶圓外的溝的比較例1的承 積量“ I 耆地降低,背面外周部” Γ::::是採用外周部無溝的比較例3的承受 圓外周溫度:低低::少:發堆積量亦少’因此可知, 深度越淺,會變得越广:底面的外周部的網狀圖樣的 另外可知,柱坑部底, 15 200941557 的中央部的溝木度,係與晶圓外周溫度降低、背 珍堆積沒有關係。 外周部 另方面’因晶圓载置時的彎曲造成的傷痕 發生於中央部的網妝m禅 不良’僅 的網狀圖樣的溝較淺的比較例2, 中央部的溝深度較深者係難以發生,而外 則咖響。但是,如比較例3般地,可知若 Ο 溝’全消除時’會發生晶圓的滑移。由此可知,如實 1般地’即使外周部中 如實施例 料成淺淺地,亦不會發生滑移。 卜可知’如比較例3般地,若急劇地改變溝、 ^晶層的膜厚形狀會於其部位改變,而有影響奈米;貌 這樣的平坦性品質的0j· @ m ’、 買的U。因此可知’改變溝深度時, 較佳疋不急劇地改變’而如實施例i般地,漸漸變化。 圓二的結果可知,如實施例1般地,若是形成其晶 圓載置面也就是柱坑部底面的外周部中的溝深度較中央部 淺之氣相成長用承受體’即可改善:因晶圓外周部溫度降 低所造成的膜厚降低、晶圓載置時的彎曲、晶圓外周部的 背面的堆積。另外’如實施们般地,因從柱坑部底面的 中央邛至外周冑’溝深度係連續地改變而變淺,因此不會 有影響到㈣形貌這樣的平坦性品質的可能性,而可製造 出高品質的磊晶晶圓。 又,本發明並非被限定於上述實施形態者,上述實施 形態僅為例示’凡是具有和本發明申請專利範圍所記載之 技術思想實質相同之構成’可達到同樣之作用效果者,皆 包含在本發明之技術範圍中。 200941557 【圖式簡單說明】 第1圖係表示本發明之氣相成長用承辱艘μ 又體的—例的 圖;(a )剖面圖、(b )平面圖、(c )凸部擴大剖面圖(d、 凸部的頂面擴大圖。 第2圖係表示本發明之氣相成長裝置的—例的圖。 第3圖係表示在實施例、比較例中製作出來的承受體 的圖。 0 第4圖係關於背面外周部矽堆積的說明圖。 【主要元件符號說明】 1 : 承受體 2 : 柱坑部 3 : 底面 4 : 外周部 5 : 中央部 6 : 凸部 11 :氣相成長裝置 12 : 反應容器 13 :承受體 13a :桎坑部 14 :氣體導入管 15 : 沖洗氣體管 16 :排氣管 17a :加熱裝置 17b :加熱裝置 18 : 支持構件 W •晶圓 17

Claims (1)

  1. 200941557 七、申請專利範圍: ι_ -種氣相成長用承受體,其係於用以在晶圓表面氣相 成長薄膜的氣相成長裝置中,用以支持晶圓的承受體,其 特徵為: 在該承受體,形成可收容晶圓的柱坑部’在該柱坑部 的底面,藉由網狀圖樣的溝來形成多數個方形凸部,上述 柱坑部底面的外周部中的溝深度,較中央部淺。 ❹2.⑹中請專利範圍第!項所述的氣相成長用承受體,其 中從上述中央部至上述外周部發生的溝深度的變化,係連 續地變淺。 3.如申請專利範圍第!項所述的氣相成長用承受體,其 中上述柱坑部底面的外周部中的最淺的溝深度,係在Μ 0-08mm的範圍,較上述外周部更内側的中央部中的最深 的溝深度,係在的範圍。 Ο 4·如申請專利範圍第2項所述的氣相成長用承受體,其 中上述柱坑部底面的外周部中的最淺的溝深度,係在0.01 〜〇.〇8mm的範圍,較上述外周部更内側的中央部中的最深 ,的溝深度’係在0.1〜〇.5mm的範圍。 5.如申請專利範圍第丨項所述的氣相成長用承受體,其 中上述外周部與上述中央部的交界係同心圓狀,上述外周 的領域係從上述柱坑部底面的外周端算起1〇脑〜職 的範圍。 18 200941557 6. 如申請專南丨ϊ=ι α τ〜乾圍第2項所述的氣相成長用承受體,其 中上述外周部盘 一上述中央部的交界係同心圓狀,上述外周 部的領域係從、+. “ & 返柱坑部底面的外周端算起10mm〜5 0mm 的範圍。 7. 如申請專利笳®1 、 圍第3項所述的氣相成長用承受體,其 t_L述外周部舆上 < r夹邠的交界係同心圓狀,上述外周. 的領域係從上逋扣p加办 上之柱坑部底面的外周端算起10mm〜50m Ο Ο 的範圍。 8·如申請專利範圍第4 Ji所、十、# 上 闽乐4項所述的氣相成長用承受體,其 中上述外周部與上述中央Μ &六、 ^ t T夹σΡ的父界係同心圓狀,上述外周 部的領域係從上述柱坑邱 一 几邛底面的外周端算起10mm〜5〇mm 的範圍。 9. 如申請專利範圍第丨至8瑁 m ^ . 項之任一項所述的氣相成長 用承受體,其中上述承夸神在 涛 又體係由石墨製的基材以碳化矽被 覆而成者。 攸 10. —種氣相成長裴置,其特徵為: 至少具備申請專利範圍第f ,. 至8項之任一項所述的氣 相成長用承受體。 ' U•—種氣相成長襞置,其特徵為. 至少具備申明專利範圍第9货^ 體。 項所述的氣相成長用承受
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