TW556405B - Acoustic detection of dechucking and apparatus therefor - Google Patents
Acoustic detection of dechucking and apparatus therefor Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70691—Handling of masks or workpieces
- G03F7/707—Chucks, e.g. chucking or un-chucking operations or structural details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/12—Analysing solids by measuring frequency or resonance of acoustic waves
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- 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
- H01L21/67—Apparatus 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
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67242—Apparatus for monitoring, sorting or marking
- H01L21/67259—Position monitoring, e.g. misposition detection or presence detection
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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
- H01L21/67—Apparatus 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
- H01L21/683—Apparatus 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
- H01L21/6831—Apparatus 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 electrostatic chucks
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/02827—Elastic parameters, strength or force
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/26—Scanned objects
- G01N2291/269—Various geometry objects
- G01N2291/2698—Other discrete objects, e.g. bricks
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Description
發明範喼 本發明相關一種偵測基;6 Ν丞板凡成脫離的方法及其裝置,例 如在真空室電漿製程等製程期卩卩 +女 衣狂/月間。此方法可用以偵測半導 體晶圓的脫離。用以偵測穿点、盼 , 疋成脫離的裝置可併入用以舉高 基板的舉高接腳裝置中,此類其 此韻基板如+導體晶圓或平面板 顯示器基板等。 發明背景 半導體製程中存在多種設備,如電漿蝕刻、離子植入、 濺鍍、快速熱製程(RTP)、微影技術、化學氣體沈積(c VD) 及平面板顯示器製造方法,其中實行蝕刻、阻抗剝落、鈍 化作用、沈積等等。此系統中,須由舉高接腳機構運送及/ 或支撐基板’此類舉高接腳機構在基板的傳送、加熱、化 學、光學及其他處理期間,可用以暫時支撐基板。 在多種此類半導體製造方法中使用電漿產生,電衆產生 設備包括如在共同持有美國專利第4,340,462號所揭露的那 種並列板反應爐;如在共同持有美國專利第5,200,232號所 揭露的那種電子離子加速諧振器(ECR)系統;及如在共同持 有美國專利第4,948,458號所揭露的那種感應耦合電漿系統 。在此電漿處理系統中,通常在部分電漿處理室内在基板 容器上支撐將處理的基板,此外亦常藉由機械式及/或靜電 鉗夾機構在基板容器上固定基板。在美國專利第4,615,755 號揭露機械鉗夾系統的例子,並在美國專利第4,554,611號 揭露靜電夾頭(ESC)裝置的例子。 為了傳送如晶圓類的基板進入基板處理室,通常利用機 556405 A7 B7 五、發明説明 械手臂及舉高接腳裝置,此類裝置如在美國專利第 4,43 1,473、4,790,258、4,842,683 及 5,215,619所揭露的型式 。為了將晶圓降至基板容器,通常使用舉高接腳裝置,如 在美國專利第4,431,473號所揭露的型式,其中將四個舉高 接腳以晶圓形式的基板為中心作成圓形配置。 美國專利第5,948,986號揭露一種在一 ESC以靜電钳住基板 之前,利用聲波偵測基板存在的技術;美國專利第 6,182,5 10 B1揭露一種在晶圓處理期間,利用聲波測量晶圓 溫度的裝置,例如使用舉高接腳作為接腳轉換器,將聲波 傳送至晶圓。美國專利第5,872,694號揭露一種裝置,用以 在晶圓内判定扭曲並提供一具ESC的最優夾壓。一旦完成晶 圓製程,已有多種技術提出用以脫離晶圓及/或判定何時已 充分釋放鉗夾力的建議,而容許安全移動晶圓,請參見美 國專利第 5,117,121 ' 5,491,603、5,790,365、5,8 18,682、 5,900,062、5,956,837及 6,057,244號。 雖然已提出用以監控/預測何時已完成脫離的技術,但此 類技術不足以判定何時已充分減少在基板上的鉗夹力,並 藉由舉高接腳或其他傳送機構,容許基板從固定表面移動 。如此看來,此藝中需要一種更準確的技術,以判定何時 已充分解開基板,並容許基板由鉗位表面傳送。 發明總結 本發明提供一種可用以偵測脫離靜電夾頭的方法及裝置 ’裝置包括一基板支撐,基板支撐包括靜電夾頭,適於以 靜電將半導體基板甜夾在其支樓表面上;一聲音信號產生
裝 訂
556405 A7 B7 五、發明説明(4) ^ ^ 場在基板的下表面產生電荷,基板與高壓電極的電荷互相 作用,結果在基板與ESC間有一淨吸力。當電漿蝕刻、沈積 等製程完成時,須將基板由真空室送出,俾能以相同方式 處理下一個基板。進行此項步驟,必須在以舉高接腳裝置 等裝置舉南基板前,先將基板與先將基板與ESC間的鉗夾力 減少至一門樓值。 本發明透過脫離技術提供改良方法及裝置,此脫離技術 依賴經驗判斷,以估算何時已發生充分的脫離。惟基板型 式間的差異及/或經過時間後E S C效能的改變,在判斷何時 已發生充分的脫離上會導致不正確的情形。本發明已提供 克服此問題的方法,藉由使用基板的饋回,能更正確判斷 何時將基板安全地從ESC移開。根據本發明一較佳方法是利 用聲波信號,以監控基板的狀況並判斷何時可安全移動基 根據第一較佳實例,將一聲音信號傳送至基板,並使用 聲音偵測器之類的偵測器監控由基板反射的聲音信號。因 為將基板夾在固定體時,比較基板與固定體間的鉗夾力降 至某一門檻以下,所反射的聲音信號表現不同,所以可偵 測何時已將鉗夾力減至足以安全地移動基板的程度。 傳送聲音信號至基板的技術係使用一舉高接腳裝置的至 少一舉高接腳,將聲音信號耦合至基板。可選擇與基板機 械諧振頻率匹配的聲波頻率,因為只要基板未完全脫離ESc ’基板與ESC將形成一耦合系統。由於耦合系統更形混亂, 其諧振頻率將比基板本身的頻率為低。由於此耦合效應, 本紙張尺度適用中g g家標準(CNS) A4規格(⑽^97公董) 556405 A7 ____B7 _ 五、發明説明) ' ' ----- 基板不會吸收舉高接腳或接腳所傳送的聲波,反而會反射 出去。另一方面,當基板完全未與ESC耦合,所傳送的聲波 將與基板的機械特徵頻率成諧振,而由基板所吸收。 可使用舉高接腳底部的聲音偵測裝置監控聲波的振幅, 發生吸收時,振幅將由於諧振放大率而明顯變高,因此, 感應到振幅增加時,可從控制器送出舉高信號至接腳舉高 機構,而使舉高接腳將基板昇高而離開ESC ,然後可使用機 械手臂將基板從真空室移開。 圖1根據本發明說明一併入聲音監裝置的裝置,此裝置包 括聲θ發射器/接收器,接在在一舉高接腳底座14的一 軸12。舉南接腳底座14包括延伸入固定體18開口的舉高接 腳16,固定體在其上部包括一 ESC,用以將基板2〇以靜電鉗 夾在固定體18的上表面。一氣動圓筒22有效地藉由垂直移 動的軸12將基板20昇高及降下,打開閥26時,即經線路24 將壓縮氣體供應至圓筒22,例如,可使用控制器3〇監控來 自發射器/接收器的饋回信號,並在發射器/接收器指示諧振 放大率已增至門檻值以上時,即操作閥26以昇高舉高接腳 16 ’該門檻值係對應至何時已充分脫離基板,並容許藉由 接腳舉高機構安全地將基板移開。 上述典型實例意圖說明本發明所有概念,但非用以侷限 本發明。因此熟諳此藝者可由此說明衍生的細節實作中做 出許多變化,而將所有此類變化與改良視為在本發明後附 申請範圍所界定的範疇與精神之内。 -8 - 本紙張尺度適用中國國家標準(CNS) A4規格(210 X 297公釐)
Claims (1)
- 556405 m 92. ?. 21 第091106000號專利申請案 中文申請專利範圍替換本(92年7月) 六、申請專利範圍 一種用以偵測脫離靜電夾頭之裝置,包括: 基板支撐,包括一靜電夾頭,適於將半導體基板以 靜電夾在其支撐表面上; 一聲音信號產生器,適於將聲音信號傳送至半導體基 板; 一偵測裝置,適於偵測半導體基板之第一及第二狀況 、,當以靜電夾住半導體基板即㈣到第—狀況,當所有 半導體基板未以靜電夾住時,偵測裝置㈣測到第二狀 況。 如申請專利範圍第1項之裝置,其中基板支撐包括舉高 接腳’與基板支撐接觸;及聲音信號產生器,透過至少 -舉高接料送聲音㈣,舉高接腳安裝料導體基板 上。 如申請專利範圍第丨項之裝置,並 坐造Μ甘U T聲音#號產生器以 半導體基板機械式諧振頻率輪屮 貝丰輸出聲波,當偵測裝置偵測 到由基板吸附之聲波增加時,即偵測到第二狀況。 如申請專利範圍第丨項之步罟, ^ ^ 展置尚包括一接腳舉高機構 及一控制器,控制器由侈測# 鈐屮Μ ^ ^ 偵測裝置接收到指示第二狀況之 輸出k 5虎’並在偵測到第-你 以昇高基板。 W一狀况時,啟動舉高接聊機構 如申請專利範圍第4項之穿f,甘士血一 動操作,控制器藉由打開中舉南接腳機構為氣 筒,氣動圓筒即昇高—轴二^、應壓縮氣體至氣動圓 t ^ # μ r ρπ ^ 1 軸連接在舉高接腳基座。 戈口甲明專利靶圍第i項之步 乂 ,、中基板支撐位於一電 本紙張尺度適财a s緖準(CNS) 556405漿I虫刻室中。 7 j, ’如申請專利範圍第1項之裝置,其中基板支撐位於— CVD室中。 8·如申請專利範圍第1項之裝置,其中基板支撐包括數個 9開口’透過開口在基板與支撐表面間供應一熱傳送氣體。 T申請專利範圍第1項之裝置,其中半導體基板為一矽 曰曰圓,當晶圓吸收到聲音信號產生器所產生之聲波時, 即偵測到第二狀況。 種偵測脫離靜電夾頭之方法,包括: 在一基板支撐上支撐一半導體基板,包括一靜電夾頭 ,適於在其支撐表面以靜電夾住半導體基板; 以聲音信號產生器產生聲音信號,適於將聲音信號傳 送至半導體基板; 半導體基板之第一及第二狀況,當以靜電夾住半導體 基板時,即谓測到第一狀況,當半導體基板未以一門檻 夾住力以靜電夾住時,則偵測到第二狀況。 ⑴如中請專利範圍第H)項之方法,其中基板支樓包括舉高 接腳,其與基板支撐接觸;及聲音信號產生器透過至少 一舉高接腳傳送聲音信號,舉高接腳安裝於半導體基板 上。 12.如中請專利範圍第1G項之方法,其中聲音㈣產生器以 +導體基板機械式諧振頻率輸出聲波,當㈣裝置偵測 到由基板吸附之聲波增加時,即偵測到第二狀況。 13 ·如申清專利範圍第1 〇項之方決 貝l万忐尚包括一接腳舉高機構 ____ 本紙張尺度適用中國國家標準(CNS) A4規格(210 X 297公董~—及-控制n ’控制器由相裝置接收到指示第二狀況之 輸出信號,並在偵測到第二狀況時,啟動舉高接腳機構 以昇而基板。 14. 如申請專利範圍第13項之方法,其中舉高接腳機構為氣 動操作,控制器藉由打開一閥而供應壓縮氣體至氣動圓 15. 筒,氣動圓筒即昇高一軸,該軸連接在舉高接腳基座。 ,申清專利範圍第1G項之方法,其中基板支撐位於一電 水蝕刻至中,在半導體基板上蝕刻一層後,即偵測 —狀況。 16·如申,專利範圍第10項之方法,其中基板支撐位於一 CVD至中’在半導體基板上沈積一層後,即偵測到二 狀況。 一 17.如f請專利範圍第_之方法,其中基板支撐包括數個 開口透過開口在基板與支撐表面間供應一熱傳送氣體。 18·如申請專㈣圍第1G項之方法,其中半導體基板為一石夕 晶圓,當晶圓吸收到聲音信號產生器所產生之 , 即偵測到第二狀況。 ------- . -3 - 本紙張尺度相巾a _家標準(CNS) A4規格(21QX297公董)
Applications Claiming Priority (1)
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US09/817,162 US6403322B1 (en) | 2001-03-27 | 2001-03-27 | Acoustic detection of dechucking and apparatus therefor |
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TW091106000A TW556405B (en) | 2001-03-27 | 2002-03-27 | Acoustic detection of dechucking and apparatus therefor |
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US (2) | US6403322B1 (zh) |
EP (1) | EP1374283A2 (zh) |
JP (1) | JP4153309B2 (zh) |
KR (1) | KR100830070B1 (zh) |
CN (1) | CN1329947C (zh) |
TW (1) | TW556405B (zh) |
WO (1) | WO2002078062A2 (zh) |
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US7073383B2 (en) * | 2001-06-07 | 2006-07-11 | Tokyo Electron Limited | Apparatus and method for determining clamping status of semiconductor wafer |
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- 2001-03-27 US US09/817,162 patent/US6403322B1/en not_active Expired - Lifetime
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- 2002-03-21 KR KR1020037012430A patent/KR100830070B1/ko active IP Right Grant
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- 2002-03-21 CN CNB028070828A patent/CN1329947C/zh not_active Expired - Fee Related
- 2002-03-21 WO PCT/US2002/006649 patent/WO2002078062A2/en active Application Filing
- 2002-03-21 EP EP02717544A patent/EP1374283A2/en not_active Withdrawn
- 2002-03-27 TW TW091106000A patent/TW556405B/zh not_active IP Right Cessation
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US6403322B1 (en) | 2002-06-11 |
JP4153309B2 (ja) | 2008-09-24 |
KR20030085572A (ko) | 2003-11-05 |
WO2002078062A2 (en) | 2002-10-03 |
US6578423B2 (en) | 2003-06-17 |
US20020142492A1 (en) | 2002-10-03 |
KR100830070B1 (ko) | 2008-05-16 |
EP1374283A2 (en) | 2004-01-02 |
CN1520607A (zh) | 2004-08-11 |
CN1329947C (zh) | 2007-08-01 |
JP2004534384A (ja) | 2004-11-11 |
WO2002078062A3 (en) | 2003-03-13 |
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