TW201731132A - 表面塗佈處理 - Google Patents

表面塗佈處理 Download PDF

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TW201731132A
TW201731132A TW105140055A TW105140055A TW201731132A TW 201731132 A TW201731132 A TW 201731132A TW 105140055 A TW105140055 A TW 105140055A TW 105140055 A TW105140055 A TW 105140055A TW 201731132 A TW201731132 A TW 201731132A
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ceramic layer
adjusting
substrate
excimer laser
laser beam
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麗華 李 黃
洪 石
西文 李
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蘭姆研究公司
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Abstract

提供調節位在基板上且厚度小於150μm之陶瓷層的方法。清潔陶瓷層。使用脈衝式準分子雷射光束在3-300 Hz之重現速率下掃描陶瓷層的區域。

Description

表面塗佈處理
本發明係關於半導體裝置之製造。更具體而言,本發明係關於塗佈用以製造半導體裝置之腔室表面。
在半導體晶圓處理期間,使用電漿處理腔室來處理半導體裝置。使用塗層以保護腔室表面。
為達成前述並根據本發明之原則,提供調節陶瓷層的方法,該陶瓷層位在基板上且厚度小於150μm。清潔該陶瓷層。使用脈衝式準分子雷射光束在3-300 Hz之重現速率下掃描該陶瓷層的區域。
在另一操作中,提供調節陶瓷層的方法,該陶瓷層包含下列至少一者:氟化物、含氧氟、或含鑭系III 族或IV族元素的氧化物,且該陶瓷層位在基板上且厚度小於150μm。清潔該陶瓷層,清潔該陶瓷層之步驟包括:沖洗該陶瓷層;對該陶瓷層施加超音波能量;並且乾燥該陶瓷層。使用脈衝式準分子雷射光束,在3-300 Hz之重現速率、介於157 nm 及351 nm之間的波長、及200 到 8000 mJ/cm2 的能量密度下,掃描該陶瓷層的區域,其中以10到500次雷射射擊處理在該陶瓷層的該區域中的每一點,其中該脈衝式準分子雷射光束提供該陶瓷層局部加熱至一溫度,其促使該陶瓷層在無損壞基板或從該基板剝離的情況下融化,其中融化該陶瓷層使該陶瓷層的孔隙度降低並減少該陶瓷層鬆動的微粒。
這些及其它特徵將在以下的實施方式中伴隨著圖式更詳細地加以說明。
現在將詳細地敘述實施例,並且參考隨附圖式中所述的幾個較佳實施例。在以下敘述中,特定細節被提出以提供對於本發明之徹底了解。然而,對於所屬技術領域中具有通常知識者而言顯然的係,本發明可在沒有這些特定細節之部分或全部之情況下加以實施。熟知的處理步驟及∕或結構並未詳細地描述,以免不必要地混淆本發明。
為了幫助了解,圖1為本發明之一實施例中使用的方法的高階流程圖。沉積陶瓷層於基板上,其中陶瓷層具有孔隙度(步驟104)。清潔陶瓷層(步驟106)。使陶瓷層經受處理製程(步驟108)。處理製程(步驟108)包含下列步驟:透過脈衝式準分子雷射提供陶瓷層之區域局部加熱至一溫度,該溫度在無損壞基板的情況下促使陶瓷層融化(步驟112);並且掃描陶瓷層上受局部加熱所加熱的陶瓷層之區域 (步驟116)。做出是否重複執行製程的決定(步驟120)。若欲重複執行製程,則重複執行孔隙度降低製程(步驟108)。若不進一步重複執行製程,則將基板製成電漿處理腔室中的元件(步驟124),例如內襯層、窗、注射器、邊緣環、或另一腔室元件的覆蓋層(covering);或將基板使用作為電極。然後將基板用於電漿處理腔室中(步驟128)。範例
在本發明的一較佳實施例的一範例中,沉積陶瓷層於基板上 (步驟104)。圖2A為基板204(其具有位於基板204上的陶瓷層208)的示意剖面圖。陶瓷層208具有孔隙度,以陰影區表示。在此實施例中,透過熱噴塗沉積(thermal spray deposition)來沉積陶瓷層208。在其他實施例中,可透過電漿噴塗(plasma spray)、懸浮噴塗(suspension spray)、PVD(電漿氣相沉積)、CVD(化學氣相沉積)、或氣膠沉積(aerosol deposition)來 沉積陶瓷層。在此實施例中,基板為陽極處理鋁。在其他實施例中,基板為氧化鋁、矽碳化物、鋁、氧化釔、或AlN。在此實施例中,陶瓷層208包含釔氧化物(氧化釔)。在其他實施例中,陶瓷層208包含下列至少一者:氟化物、含氧氟、或含鑭系III 族或IV族元素的氧化物、或陶瓷塗層的其他組合。較佳的係,陶瓷塗層包含下列至少一者: 釔氧化物、釔氟化物、氧氟化釔、或釔安定氧化鋯。
熱噴塗為用以描述各種塗佈處理的一般用語,例如電漿噴塗、電弧噴塗、火焰/燃燒噴塗、及懸浮噴塗。所有熱噴塗均使用能量將固體加熱至熔融或增塑(plasticized)狀態。將熔融或增塑材料朝基板加速,使得熔融或增塑材料塗佈基板的表面並冷卻。較佳的係,使用電漿噴塗來提供氧化釔塗層。這些處理與氣相沉積處理不同,氣相沉積處理使用汽化材料(而非熔融材料)。在此實施例中,陶瓷塗層的厚度小於150μm。
清潔陶瓷層(步驟106)。在此實施例中,清潔首先包含陶瓷層之表面的去離子水沖洗。然後使陶瓷層之表面經受超音波清潔,這可使用超音波振盪。然後將陶瓷層加熱至100℃以乾燥陶瓷層之表面。
使陶瓷層經受處理製程(步驟108)。在此製程中,透過脈衝式準分子雷射提供陶瓷層208之區域局部加熱至一溫度,該溫度在無損壞基板的情況下促使陶瓷層融化(步驟112),以將局部區域加熱至一溫度,該溫度使在該局部區域的陶瓷塗層融化而不損壞基板204。能量主要在陶瓷塗層的頂部50μm或更小處耗散,使得距離表面大於50μm的材料不融化。更佳的係,距離表面大於30μm的材料不融化。這需要選擇被陶瓷塗層吸收的能量來源。在此實施例中,融化陶瓷層使孔隙度降低。融化陶瓷亦可包括以複數次暴露及改變的能量位準來再融化陶瓷,以達到期望的材料性質(亦即融化深度及表面光度)。
圖3為用以提供陶瓷層208之局部準分子雷射加熱(步驟112)的準分子雷射加熱系統300之示意圖。準分子雷射加熱系統300包含準分子雷射304。準分子雷射304提供進入腔室302中的脈衝式雷射光束308。在一些實施例中,準分子雷射304位在腔室302之中。在其他實施例中,準分子雷射304位在腔室302之外,其中脈衝式雷射光束308定向進入腔室302中。脈衝式雷射光束308定向至鏡子312。在此實施例中,鏡子連接至鏡子制動器316。鏡子312將脈衝式雷射光束308反射至基板208。
基板固持器340位於腔室302中。基板固持器340可耦接至二維移動系統342,以在x方向及y方向上獨立地移動基板固持器340。在此範例中,移動系統342包含用以在x方向上移動基板固持器340的x階段343、及用以在y方向上獨立地移動基板固持器340的y階段344。二維移動系統342相對於脈衝式雷射光束308而移動基板。基板固持器340可更包含加熱元件350,例如舉例來說,電阻式加熱器、及/或散熱件(例如水冷板),以在處理期間控制基板的溫度。
在存在淨化氣體(purge gas ,例如N2 、He、或 Ar)之情況下,將具有陶瓷層208的基板204放置於準分子雷射加熱系統300中。透過準分子雷射304將陶瓷層208之局部區域加熱至一溫度,而在無損壞基板204的情況下促使陶瓷層融化,其中融化使孔隙度降低並使鬆動的(loose)微粒減少(步驟112)。脈衝式雷射光束在陶瓷層208上產生面積為1-10 mm2 的光束場(beam field),使得被脈衝式雷射光束直接加熱的局部加熱區域具有1-10 mm2 的面積。
在陶瓷層208上,掃描陶瓷層208之局部加熱區(步驟116)。在各種實施例中,二維移動系統342或鏡子312之移動(藉由鏡子制動器316) 可分開地或結合地使用,以提供掃描。在此實施例中,掃描為沿著x及y方向形成行列的笛卡爾座標(Cartesian)。在其他實施例中,掃描可為旋轉的(以螺旋的路徑)。局部加熱使陶瓷層208加熱至陶瓷層208的融化溫度,而促使陶瓷層208融化並再固化。在一些實施例中,陶瓷層已在先前步驟中被融化,故此融化為再融化。在此範例中,決定陶瓷層208上的局部區域將掃描兩次(步驟120)。在此實施例中,第二次掃描將在與第一次掃描不同的處理條件下進行。在其他實施例中,第二次掃描將在相同的處理條件下進行。
圖2B為基板204(其具有位於基板204上的陶瓷層208)在陶瓷層208上的局部區域已經掃描兩次之後的示意剖面圖。製程已降低孔隙度並減少表面微粒,如以被減少的陰影區表示。可提供其他處理步驟,例如陶瓷層之表面的額外去離子水沖洗與乾燥。
然後將基板204製成電漿處理腔室的部分(步驟124)。圖4為電漿處理腔室400的示意圖,基板安裝於其中。電漿處理腔室400包含限制環402、上電極404、下電極408、氣體來源410、內襯層462、及排氣泵浦420。內襯層462係從具有再融化陶瓷層的基板形成。在電漿處理腔室400中,晶圓466放置在下電極408上。下電極408結合了適當的基板夾持機制(例如靜電、機械夾具等),以固持晶圓466。反應器頂部428結合了正對下電極408而設置的上電極404。上電極404、下電極408、及限制環402界定了限制電漿容積440。
氣體藉由氣體來源410並通過氣體入口443而供應到限制電漿容積440中,並且藉由排氣泵浦420並通過限制環402及排氣埠而從限制電漿容積440中排氣。除了幫助將氣體排氣以外,排氣泵浦420亦幫助調節壓力。RF來源448電氣連接至下電極408。
腔室壁452圍繞內襯層462、限制環402、上電極404、及下電極408。內襯層462幫助避免通過限制環402的氣體或電漿接觸腔室壁452。連接RF功率至電極的不同組合係可能的。在較佳實施例中,27 MHz、60 MHz、及 2 MHz功率來源形成連接至下電極408的RF功率來源448,而上電極404接地。控制器435可控制地連接至RF來源448、排氣泵浦420、及氣體來源410。處理腔室400可為CCP(電容耦合型電漿)反應器或ICP(感應耦合型電漿)反應器、或可使用其他來源,像是表面波、微波、或電子迴旋共振ECR。
然後將基板用於電漿處理腔室中(步驟128)。在使用時,將晶圓466放置在下電極408上。電漿處理氣體(例如蝕刻氣體或沉積氣體)從氣體來源410流進電漿處理腔室400中。在此範例中,電漿處理氣體具有包含氫及鹵素的組成物。電漿處理氣體形成用於電漿處理的電漿。含氫及鹵素之組成物中的若干者沉積在內襯層462上。當開啟腔室時,氫及鹵素組成物與水蒸氣結合而形成酸。在高孔隙度的情況下,陶瓷層將使基板暴露到酸,而導致基板腐蝕。熱處理使孔隙度降低,改善了陶瓷層對於基板的保護,而遠離酸。
較佳的係,陶瓷層之孔隙度在處理之前高於5%,在處理之後低於1%。在另一實施例中,陶瓷層之孔隙度在處理之前高於1%,在處理之後低於0.5%。在兩個例子中,孔隙度均降低至少50%。較佳的係,局部加熱具有小於50μm的融化深度。更佳的係,融化深度小於30μm。小的融化深度可避免陶瓷層從基板上剝離。此小的融化深度允許陶瓷融化,而在不損壞或融化基板的情況下使陶瓷回流。在一些實施例中,陶瓷層中的材料係第一次融化。在其他實施例中,陶瓷層中的材料係再融化。在其他實施例中,若干材料係第一次融化而其他材料係再融化。在一些實施例中,基板為Al、陽極處理Al、或氧化鋁,且局部加熱區域將陶瓷層加熱到至少1800℃之溫度。較佳的係,當使用脈衝式準分子雷射光束時,融化的局部區域具有小於5cm的直徑。
在一些實施例中,融化的陶瓷層具有改善的微粒效能、均勻度、密度、純度、及表面光度,以改善化學及電漿抗性。再融化亦可用以密封PVD及CVD處理的柱狀顆粒晶界。再融化亦可減少氣膠沉積之塗層凹坑及低密度面積、提高塗層硬度及破裂韌度。在一些實施例中,在不損壞下層鋁(熔點大約為660℃)或氧化鋁基板(具有高得多的融化溫度)的情況下,將陶瓷層加熱至高於2200℃的溫度。
脈衝式準分子雷射具有頻率,較佳的係,在157 nm 至351 nm的波長範圍內。更具體而言,脈衝式準分子雷射具有範圍在193 nm 至351 nm內的波長。依據陶瓷層而選擇來自準分子雷射之脈衝式雷射光束的頻率,使得較佳的係,低於60%的雷射光束跨越陶瓷層的厚度而穿透通過陶瓷層。更佳的係,低於50%的雷射光束跨越陶瓷層的厚度而穿透通過陶瓷層。較佳的係,準分子雷射以3-300 Hz的重現速率加以脈衝。更佳的係,準分子雷射提供脈衝重現速率為25-200 Hz的脈衝。較佳的係,陶瓷層之表面上的脈衝式雷射光束的面積介於0.01 mm2 到100 mm2 之間。更佳的係,陶瓷層之表面上的脈衝式雷射光束的面積介於1  到10 mm2 之間。受到脈衝式雷射光束所加熱的陶瓷層的局部加熱區域大約等於脈衝式雷射光束的面積。光束形狀可為方形光束的型態。當需要時,可實行圓形、菱形、π形、或線形光束形狀,以進一步增強處理速度。較佳的係,脈衝式雷射光束的平均雷射能量密度(通量)為200 到 8000 mJ/cm2 。更佳的係,脈衝式雷射光束的平均雷射能量密度為500 到 3000 mJ/cm2 。較佳的係,各個區域被脈衝1到5000次。更佳的係,各個區域暴露至10到500次雷射射擊。此種暴露可為靜態(static)暴露:脈衝相同的面積達給定之脈衝次數,然後移動到另一未重疊的面積;或暴露可在面積(該面積在脈衝之間被照射)中緩慢移動,而產生重疊的脈衝區域,其中重疊面積被照射達特定次數。此種脈衝消除或減少未融化或懸浮的(dangling)微粒、裂痕、並消除或降低孔隙度。此類脈衝亦可緻密化陶瓷層、改善抗電漿侵蝕性、抑制微粒形成、並改善陶瓷層的機械性質。
在另一實施例中,陶瓷層在用於電漿處理腔室後再修復 (而非陶瓷層在基板上形成)。將基板與陶瓷層從電漿處理腔室中移除。清潔陶瓷層的表面。在此範例中,清潔陶瓷層的表面首先提供陶瓷層之表面的拋光。此類拋光移除汙染,但亦對陶瓷層產生表面與底面的損壞。然後使陶瓷層的表面經受超音波處理,以提供超音波振盪。接著使陶瓷層的表面經受去離子水沖洗。並將陶瓷層加熱至100℃以乾燥陶瓷層之表面。再使陶瓷層經受脈衝式準分子雷射處理,以將至少部分的陶瓷層再融化。然後可提供後續的去離子水沖洗及乾燥。在其他實施例中,可提供其他清潔步驟,例如洗滌(scrubbing)或化學擦拭(wiping)。將再修復的基板放回電漿處理腔室中,並將電漿處理腔室與經安裝的再修復基板一起使用。
本發明雖已透過數個較佳實施例加以說明,但仍有許多落於本發明範疇內之替換、變更及各種置換均等物。有許多本文中揭露之方法及裝置的替代實施方式。因此欲使以下隨附請求項解釋為包含所有落於本發明之真正精神及範疇內的此替換、變更及各種置換均等物。
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204‧‧‧基板
208‧‧‧陶瓷層
300‧‧‧準分子雷射加熱系統
302‧‧‧腔室
304‧‧‧準分子雷射
308‧‧‧脈衝式雷射光束
312‧‧‧鏡子
316‧‧‧鏡子制動器
340‧‧‧基板固持器
342‧‧‧移動系統
343‧‧‧x階段
344‧‧‧y階段
350‧‧‧加熱元件
400‧‧‧處理腔室
402‧‧‧限制環
404‧‧‧上電極
408‧‧‧下電極
410‧‧‧氣體來源
420‧‧‧排氣泵浦
428‧‧‧頂部
435‧‧‧控制器
440‧‧‧限制電漿容積
443‧‧‧氣體入口
448‧‧‧RF(功率)來源
452‧‧‧腔室壁
462‧‧‧內襯層
466‧‧‧晶圓
在伴隨的圖式中,以範例的方式(而非限制的方式)說明所揭露的發明,其中類似的元件符號表示類似的元件,其中:
圖1為本發明之一實施例的高階流程圖。
圖2A-B為根據本發明之一實施例加以處理的基板的示意圖。
圖3為可用於根據本發明之一實施例之局部加熱系統的示意圖。
圖4為可用於根據本發明之一實施例之蝕刻反應器的示意圖。
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Claims (19)

  1. 一種調節陶瓷層的方法,該陶瓷層位在基板上且厚度小於150μm,該方法包括下列步驟: 清潔該陶瓷層; 使用一脈衝式準分子雷射光束在3-300 Hz之重現速率下掃描該陶瓷層的一區域。
  2. 如申請專利範圍第1項之調節陶瓷層的方法,其中該脈衝式準分子雷射光束具有相對於該陶瓷層之厚度提供低於60%之穿透率的一波長。
  3. 如申請專利範圍第2項之調節陶瓷層的方法,其中該脈衝式準分子雷射具有200 到 8000 mJ/cm2 的雷射能量密度。
  4. 如申請專利範圍第3項之調節陶瓷層的方法,其中該脈衝式準分子雷射提供波長介於157 nm 及351 nm之間的雷射光束。
  5. 如申請專利範圍第4項之調節陶瓷層的方法,其中以10到500次雷射射擊處理在該陶瓷層的該區域中的每一點,其中該脈衝式準分子雷射光束提供該陶瓷層局部加熱至一溫度,其促使該陶瓷層在無損壞基板或從該基板剝離的情況下融化,其中融化該陶瓷層使該陶瓷層的孔隙度降低。
  6. 如申請專利範圍第5項之調節陶瓷層的方法,其中清潔該陶瓷層之步驟包括: 沖洗該陶瓷層; 對該陶瓷層施加超音波能量;並且 乾燥該陶瓷層。
  7. 如申請專利範圍第6項之調節陶瓷層的方法,其中該陶瓷層包含下列至少一者:氟化物、含氧氟、或含鑭系III 族或IV族元素的氧化物。
  8. 如申請專利範圍第7項之調節陶瓷層的方法,更包含將該基板放置於一電漿處理腔室中。
  9. 如申請專利範圍第8項之調節陶瓷層的方法,更包含沉積該陶瓷層於該基板上。
  10. 如申請專利範圍第9項之調節陶瓷層的方法,其中沉積該陶瓷層之步驟包含提供熱噴霧塗層。
  11. 如申請專利範圍第10項之調節陶瓷層的方法,其中再融化深度小於50μm。
  12. 如申請專利範圍第1項之調節陶瓷層的方法,其中該陶瓷層包含下列至少一者:釔氧化物、釔氟化物、氧氟化釔、或釔安定氧化鋯。
  13. 如申請專利範圍第1項之調節陶瓷層的方法,其中該脈衝式準分子雷射具有200 到 8000 mJ/cm2 的雷射能量密度。
  14. 如申請專利範圍第1項之調節陶瓷層的方法,其中該脈衝式準分子雷射提供波長介於157 nm 及351 nm之間的雷射光束。
  15. 如申請專利範圍第1項之調節陶瓷層的方法,其中以10到500次雷射射擊處理在該陶瓷層的該區域中的每一點,其中該脈衝式準分子雷射光束提供該陶瓷層局部加熱至一溫度,其促使該陶瓷層在無損壞基板或從該基板剝離的情況下融化,其中融化該陶瓷層使該陶瓷層的孔隙度降低。
  16. 如申請專利範圍第1項之調節陶瓷層的方法,其中清潔該陶瓷層之步驟包括: 沖洗該陶瓷層; 對該陶瓷層施加超音波能量;並且 乾燥該陶瓷層。
  17. 如申請專利範圍第1項之調節陶瓷層的方法,其中該陶瓷層包含下列至少一者:氟化物、含氧氟、或含鑭系III 族或IV族元素的氧化物。
  18. 一種調節陶瓷層的方法,該陶瓷層包含下列至少一者:氟化物、含氧氟、或含鑭系III 族或IV族元素的氧化物,且該陶瓷層位在基板上且厚度小於150μm,該方法包括下列步驟: 清潔該陶瓷層,其中清潔該陶瓷層之步驟包括: 沖洗該陶瓷層; 對該陶瓷層施加超音波能量;並且 乾燥該陶瓷層; 使用一脈衝式準分子雷射光束,在3-300 Hz之重現速率、介於157 nm 及351 nm之間的波長、及200 到 8000 mJ/cm2 的能量密度下,掃描該陶瓷層的一區域,其中以10到500次雷射射擊處理在該陶瓷層的該區域中的每一點,其中該脈衝式準分子雷射光束提供該陶瓷層局部加熱至一溫度,其促使該陶瓷層在無損壞基板或從該基板剝離的情況下融化,其中融化該陶瓷層使該陶瓷層的孔隙度降低。
  19. 如申請專利範圍第18項之調節陶瓷層的方法,更包含將該基板放置於一電漿處理腔室中。
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