TW541356B - Surface treating agent for micromachining and method for surface treatment - Google Patents

Surface treating agent for micromachining and method for surface treatment Download PDF

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TW541356B
TW541356B TW088102968A TW88102968A TW541356B TW 541356 B TW541356 B TW 541356B TW 088102968 A TW088102968 A TW 088102968A TW 88102968 A TW88102968 A TW 88102968A TW 541356 B TW541356 B TW 541356B
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oxide film
micro
film
weight
surface treatment
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Hirohisa Kikuyama
Masayuki Miyashita
Tatsuhiro Yabune
Tadahiro Ohmi
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Stella Chemifa Kk
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    • H01L21/04Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
    • H01L21/18Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
    • H01L21/30Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
    • H01L21/302Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
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    • H01L21/18Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
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    • H01L21/71Manufacture of specific parts of devices defined in group H01L21/70
    • H01L21/768Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
    • H01L21/76801Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing
    • H01L21/76802Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing by forming openings in dielectrics
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Description

541356 五、發明說明(1) 技術領域 本發明是有關於微細加工表面處理劑及表面處理方 法,更詳言之,有關於使用在半導體元件製造時之氧化物 微細加工之濕式洗淨目的’以及表面或是微細加工之半導 體元件表面洗淨目的極為有效的表面處理劑以及使用上述 表面處理劑之表面處理方法。 背景技術 隨著半導體電路的進展’半導體積體電路之濕式製程 中,晶圓表面及微細加工表面的清洗•蝕刻以及圖案化的 凊淨化•精密化•高度化的重要性更為提高。氫,氟酸(UF) 及氟化銨(NHJ )的混合溶液(氫氟酸緩.衝溶液)為上述濕钱 刻過程不可或缺的微細加工表面處理劑,其被使用於清洗 •餘刻以及圖案化的用途,然而,因為次微米 (submi cron)超高積集化的原因,所以其必須越來越具高 性能與高機能。 特別是’伴隨著高積集化的進展,接觸孔亦發展至〇. 25 "m、0.18 //111般地微細。再者,導線數以及步驟數亦增 加。而且,膜間絕緣膜除了習知的CV])膜之外,尚使用有 機系的TE0S膜。
,使用TE0S膜時雖然在500 °c〜80 〇 進行熱處理,然a 2 = 2之後,導線寬或材料被限定的IGbihDRAM,在電 膜5 1 2 Ϊ f理溫度必須抑制於5 0 0 °C左右,而膜間絕矣 ::=^制!!250,0。。以下。而且,熱處理溫度- ’、之藥液對於CVD系氧化獏、TE〇s膜等變得$
541356 五、發明說明(2) 常地快速。 再者’欲進行接觸孔乾钱刻處理時,例 m直徑、卜2 " m深度乾餘刻時’為了尺寸丁: 8: 狀的優先,目前採用不考慮接觸孔底部損壞的 /。(言 ,的結果會導致孔洞底部的基板或聚。膜受到損壞:二 疋2〇nm左右的基板表面產生非晶石夕。再者,更在1部 3〇nm附近被施以乾蝕刻氣體種類之⑺系離子植入捭 為 了去除這種損壞,或是光阻去除時的洗淨步驟變得^來命 重要,例如RCA洗淨變得不可缺,另一方面,由於進^于這 ^的洗淨會形成自然氧化膜’戶斤以上述去除方法#會產生問 題0 習知,去除如上所述的自然氧化膜主要是使用稀HF、 或是緩衝氫氟酸(BHF) 〇BHF的情況,例如是使用1〇(). lBHF(4〇%NH4F :50%HF = 1〇〇 :1),對熱氧化膜姓刻速度在 25 C為10nm/min左右的藥液。 然而,欲去除開口於熱處理溫度低的氧化膜(TE〇s)之 - 接觸孔底部之自然氧化膜時,熱處理温度低的側壁之TE〇s 膜的敍刻速度極為快速,〇 · 2 5 # m直徑的孔洞洗淨後,有 擴大〇· 5 //m的情況。亦即,使用稀HF或1〇〇 : 1MF時,孔 =直徑若不擴大,實際上去除自然氧化膜很困難。因此,_ 習知採用圖案化〇· 2 # m的孔洞直徑,然後藉由蝕刻擴大比 先W還大的設計。然而,隨著微細的進展,0 · 1 8 # m、 〇· 1 5 // m的设計準則已無法容許這樣的邊緣(margin)。 去除形成於接觸孔底部的自然氧化膜時,必須增加自
541356
然氧化膜的蝕刻速度與側壁(CVD膜、TE〇s膜等)蝕刻速度 選擇比。亦即,最好儘可能地去除自然氧化膜。然而,實 際上,自,氧化膜的蝕刻速度比CVD膜或TEOS膜還大,再 者,基於量產工廠的製程考量,去除自然氧化膜所花費的 時間愈短愈好。因為,在溼處理站處理晶圓時,以一次置 入2 5片之8吋晶圓卡槽而處理的批式為主流。此時,由蝕 刻槽搬移晶圓卡槽至純水槽的時間成為問題。因此,最好 將機械式控制管理時間保持於3〇秒〜丨分鐘左右最好。亦 即,去除自然氧化膜的時間為10秒左右的話,為了考慮完 ^地過蝕刻的時間以及搬移的時間,晶圓與處理嘥接^的 日1間必須大約1分鐘。結果接觸孔側壁部分亦蝕刻相同的 添因此,本發明的目的在於提供一種微細加工表面處理 =以及微細表面處理方法,其可固定蝕刻時間為丨分鐘前 1 ,然後在此範圍的蝕刻時間内,儘可能地使自缺氧化膜 2蝕刻速度變慢,並且使CVD系氧化膜或TE〇s膜的選擇比、 發明的揭示 本發明之細加工表面處理劑,其特徵在於包括··小於 ^ 1重量%的氫氟酸·,以及47重量%以下,且4〇重量%以7上的 氟化銨。 G 的 其為使氨氣溶解 包含〇· 001〜1重 再者,本發明微細加工表面處理劑, 於氫氟酸溶液調製而成。 而且,本發明微細加工表面處理劑, 541356
量%的界面活性劑。 、再者,本發明之表面處理方法,其特徵在於 述微細加工表面處理劑,去除士 ;,使用上 =次m定上述各成份組成範圍的理由 白知微細加工表面處理劑,特 4〇重量%_4F與50重量%_製造而成,因』h夂是^合 的上限為40重量%。 辰度
本發明之發明者,藉由混合龍3氣體與HF,以確立 ,造出比NM濃度比習知40重量%高之高濃度之緩衝氣氟 酉文的‘造方法。並且發現NHj為高濃度的話,上述cvd 膜、TEOS膜的蝕刻速度變慢,且具有充分之自然氧化膜的 去除性能。然而,若45重量%以上時’藥液會析出結晶、, ,且難以進行蝕刻反應,再者,容易產生偏差,所以 表好為45重量%以下,上限為47重量%。 。 再者,一般而言,藥液之液溫溫度範圍最好為2〇〜25 °C °而且,室内溫度一般最好為23〜25 t。 亦即,NH4F為47重量%、HF濃度為〇· 〇5重量❹/。時,結晶 析出溫度大約為3 0 t,所以蝕刻槽必須加溫。再者,藥液 貯槽、管線亦必須加溫,實用性不佳。
因為,為了設定結晶析出溫度為25 °C以下,NH4F濃度 最好為45重量%以下。 上限為47重量%的理由如下。亦即,47重量% iNH4F, 洗淨•蝕刻本身不會產生問題。然而,NH4F濃度大於47重 量%的話,結晶析出溫度急劇地變高,變得難以控制。
第7頁 541356 五、發明說明(5) 例如’ 49重量%之⑽』濃度’結晶析出溫度上昇至45 °C。47重量%至49重量的變化,結晶溫度上昇至接近15 V。 因此,雖然洗淨·#刻能力本身並不會產生很大的不 同,然而,溫度控制困難,並且若考慮到溫度上昇使在高 溫使用的藥液蒸發而導致的NHJ濃縮的話,可以使用的 NHJ濃度範圍上限為47重量%,最好為45重量%以下。 β本發明微細加工表面處理劑之^的濃度下限為〇 . 〇〇1 重。此為蝕刻處理的濃度。例如,在25 π氧化膜的蝕 刻速度為0.001埃/ min。 本發明微細加工表面處理劑最好含有界面活性 5有量最好為0.00W重量%,更好為〇 〇〇5重量% 〇 重 l%(50ppm〜l〇〇〇ppm) 。 · 比0.001重量%的低濃度幾乎沒有 重量%以上效果相同。 双木丹#,1 含有界面活性劑的理由如下。 左右或是以下的微細加工表面處理咧難二::隔〇· 5 //in 以氧化膜的蝕刻均-度會降低 士:艮:次浚軋化膜,所 的話,可改善光阻表面的浸渥 疋精由添加界面活性劑 蝕刻均一性。再者,露出s丨表 士並且更提昇矽氧化膜的 制表面的粗糙,而實頊鲈古:f時’藉由界面活性劑可抑 再者,NHJ在飽和濃度以上又裒置。 一旦析出結晶的話,且=丄的話’會析出結晶,然而 相同溶液的問題。此处a X左右的溫度亦難以回復 、、”曰之极子由於會產生姓刻不平均等
Μ $ 8頁 541356 五、發明說明(6) 偏差,所以必須去除,然而藉由添加界面活性劑可防止姅 晶之粒子附著於晶圓之表面。 μ 本發明的界面活性劑例如為,脂肪族胺(CnH2n+1NH2 · η二7〜14)、脂肪族羧酸(CnH2n+lC00H ;n = 5〜n)、或脂肪族醇 (CnH2n+1OH ; η = 6〜12)。特別是,至少配合i種上述三種界 活性劑,並且最使因NHJ濃度、肝濃度槽度而選擇。再 者,這些界面活性劑的碳鏈部為直鏈或是支鏈構造(分 狀)皆可。特別好的界面活性劑為脂肪胺與脂肪羧酸。 本發明微細加工表面處理劑的製造法為,如上 Hj水溶液吸收NH3軋體的方法(HF溶液吸收帅〗氣體•,以:1 高濃度的NH』,然後使其與50重量%的犯混合至所欲^ 例之方法也可以),另外,尚有將高純度㈣粉體溶^ HF的方法·’以超純水吸收Nh3氣體,以製造 : 度的NH4〇H水溶液,然後使其與5〇重量,混合 ^,屯 然而,以HF水溶液吸收NH3氣體的方法,可得到去寺。 產物,所以最好。再者,Nh3氣體在HF水溶收ς 驟或是通氣泡步驟被吸收。 A Η文步 本發明微細加工表面處理劑, 膜内的接觸孔内Si表面所產生 成;下述氧化 的氧化膜不論有無熱處理生的自&化膜。再者,以下 熱氧化膜(乾氧化膜、渥氧 CVD氧化膜:未摻雜 、 CVD氧化膜:PSG膜(P摻雜卜8重量 CVD氧化膜:BSG膜(B摻雜18重量
541356
CVD氧化膜:AsSG膜(As摻雜1〜8重量%) CVD氧化膜iBPSG膜(B,P摻雜各卜8重量%) 離子植入之AsSG膜(As摻雜1〜8重量%) 離子植入之PSG膜(P摻雜1〜8重量〇/0) 以及TEOS膜··未摻雜膜 摻雜TEOS膜:B,P摻雜膜各丨〜8重量% 實施發明之最佳形態 以下列舉實施例以更詳細地說明本發明,然而本發明 不限於實施例。 (實施例1 ) , 、 以熱氧化膜、電漿TEOS(PL-TEOS)膜以及自然氧化膜 為例’並且調查藥液組成與蝕刻速度之結果顯示於表1。 广並且’本實施例之中,熱氧化膜為在1〇〇〇、利用加 熱氧化法(H2 : 〇2 = 1 : 1)形成。再者,PL-TE0S膜為利用電 浆CVD法,並且使用TE0S(Si(0C2H5)4)以及氧氣,而在400 °C形成。自然氧化膜為浸潰於98%Η#〇4與31%H2〇2的混合溶 液(4 : 1)所形成。 另一方面’蝕刻速度為利用以下所述求得。 熱氧化膜以及CVD系、TE0S系氧化膜為使用光學式膜 厚測定裝置’藥液浸潰前後以測定膜厚,並且根據浸潰時 間與膜厚減少量算出蝕刻速度。自然氧化膜是以光學式測 定浸潰前後的膜厚,並且使晶圓浸潰時間變化3秒、5秒、 1 〇秒···’此時觀察晶圓的撥水狀態以進行自然氧化膜的 去除確認,由此算出蝕刻速度。
第10頁 541356 五、發明說明(8) +此時,自然氧化膜的膜厚為,比較熱氧化膜與自然氧 化膜之ESCA的Si尖峰強度與橢圓測定膜厚,而換算出之埶 氧化膜的膜厚值。 … (表1) 藥液組成 HF濃度 NH4F渡度 姓刻連度(nm min) at 25 -赛聲化膜 PL-TEOS 自然秘化膜 0.5 39. 6 9.0 15. 0 45. 0 0.25 39. 8 5.1 9.0 28. 0 0.12 41. 0 3.0 6.0 13. 0 0.10 41. 0 2.8 4.5 9.0 0.09 39. 9 2.7 5.5 11. 0 0.09 17. 0 2.6 9.5 36. 0 0.09 40. 01 2.5 8.5 9.2 0.03 45. 0* 2.0 3.0 6.0 0.001 45. 0* 0.2 0.5 1. 0 * )藥液的組成在25 t析出結晶,所以顯示35 X:的蝕刻 數據。 由表1可清楚地得知,使用HF濃度〇· 1重量%以下,且 NHJ濃度較40重量%高的藥液的話,自然氧化膜與PL —TE〇s 膜或是熱氧化膜之蝕刻速度接近。 (實施例2)
以熱氧化膜與TEOS-BPSG膜、自然氧化膜為例,並且 與實施例1 一樣調查藥物組成與蝕刻速度,顯示於表2。自 然氧化膜、熱氧化膜與實施例1 一樣地形成。 再者,TEOS-BPSG膜為,利用常壓CVD法,並且使用 TEOS、〇3、TMOP((CH30)3P〇)、TMB((CH30)3B),在40 0 °C 形
第11頁 541356 五、發明說明(9) 成。 (表2) 藥液組成 姓釗速度(nm min) at 25 HF濃度 nh4f濃度 熱駿化膜 TE〇S-BPSG膜 自然鲅化膜 0.5 39. 6 9.0 36. 1 45. 0 0.25 39. 8 5.1 22. 8 28. 0 0.12 41. 0 3.0 11. 9 13. 0 0.10 41. 0 2.8 6. 6 930 0.09 39. 9 2 Π 9.5 11· 0 0.09 17. 0 2.6 27. 4 36. 0 0.09 40. 01 2.5 8.5 9.2 0.03 42. 0 1.5 2.5 4.5 0.001 42. 0* 0.1 0.3 0.6 由表2可清楚地得知,使用HF濃度〇· 1重量%以下,且 NHJ濃度較40重量%高的藥液的話,自然氧化膜與 TEOS-BPSG膜或是熱氧化膜之蝕刻速度接近。 (實施例3 ) 在石夕晶圓上形成1 //m的Os —TE0S膜、pl-TE0S膜,然後 利用微景〉製程以及乾钱刻以形成〇 · 5 # m的接觸孔。接著, 進行光阻去除以及RCA洗淨,之後,與表3所示的各種藥液 接觸1分鐘,以去除自然氧化膜(丨〇 nm)。 利用SEM觀測處理後的接觸孔直徑。結果顯示於表3。 並且,〇3-TEOS膜為,利用常壓CVD法,並且使用TE〇s 以及03,在350 °C形成。
第12頁 541356 五、 發明說明 (10) --------- (表3) 藥液組成 接觸孔尺寸(μιη) ---~——--— HF濃度 NH4F濃度 初期值 PL-TEOS 膜 0.5 39. 6 0.5 0.53 丄 % 0.60 0.25 39. 8 0.5 0.52 0.55 0.12 41. 0 0.5 0.51 0.52 0.10 41. 0 0.5 0.51 〇51 0.09 39. 9 0.5 0.51 w Ο丄 0.52 0.09 17. 0 0.5 0.52 〇_57 0.09 41. 0 0.5 0.50 0.51 0.03 42. 0 0.5 0.50 0.50 0.001 45. 0 0.5 0.50 Π c 〇 ________ U . 〇 〇
由表3可清楚地得知,藉由使用HF濃度〇· i重<量%以 下’且ΝΗβ濃度超過40重量%的藥液,可抑制形成於 〇3-TEOS膜或是PL-TEOS膜之接觸孔擴大,並且得到設計的 孔洞直徑。 (實施例4) 與實施例3同樣形成〇 · 2 5 // m的接觸孔,接著以各種藥 液去除自然氧化膜之後,利用SEM觀測接觸孔的直姓' 果顯示於表4。 &
第13頁 541356 五、發明說明(11) 藥液組成 HF濃度 NH4F濃度 0.5 39. 6 0.25 39. 8 0.12 41. 0 0.10 41. 0 0.09 39. 9 0.09 17. 0 0.09 41. 0 0.03 42. 0 0.001 45. 0
0 25 接觸孔尺寸(μιη) ^ΤΕ0^ m__Ο,-τεπ^ 犋 25 25 25 25 2S 2S 2S 0^25 0.28 0.27 0.26 0.25 0.26 0.27 0.25 0.25 0.25 0.33 0.30 0.28 0.26 0.27 0.32 0.26 0.25 0.25 由表4可清楚地得 ^ 下,且嶋度超過4。重量=;HFf度0.1重量%以 為〇.25^時,,亦可抑d,2使接觸孔的直徑 的孔洞直徑。 成接觸孔擴大,並且得到設計 (貫施例5) 根據有無使用界面活柯 不同。 生M,以顯不接觸孔不良個數的使用HF濃度〇· 〇5%、Nh 蝕刻0.5 /zm的接觸孔,^ /辰度4"°的樂品,然後在25¾ 膜的干涉色。 ,以光學顯微鏡確認殘存氧化 熱氧化膜厚·· 5000埃厚 光阻膜厚:0·7 /zm厚 蝕刻時間·· 20分鐘 、、、、、'力界面/舌性劑〇· 5 接觸孔不良個數(個/ 1 000個
541356 五、發明說明(12) 中) 〇 〇 X X 可確 常少。 (實施例6) 根據界面 同。 使用H F滚 活性劑溫度變 次,以光學顯 界面活性劑添 /1000個中) 0. 0. 0. 0. 可 的不良個數變 產業上之利用 根據本發 不但可抑制接 1個 0個 277個 95個 認藉由使用界面活性劑 005 002 0 0 0 9 0 0 0 5 確認界 接觸孔不良個數變得非 活性劑添加,以顯示接觸孔不良個數的不 度0. 05%、NH4F濃度41%的藥品,妙 化,接著的接=使界其面 微鏡確認殘存氧化膜的干涉色。 加濃度(重量%) 0 · 5 // m接觸孔不良個數(個 1個 10個 77個 138個 面活性劑濃度小於〇 · 〇 〇 1重量%的話,接觸孔 多。 可能性 明微細加工表面處理劑以及表面處理方法, 觸孔側壁的氧化膜之蝕刻,還可去除形成於
541356 五、發明說明(13) 接觸孔底部的自然氧化膜。 亦即,根據本發明微細加工表面處理劑以及表面處理 方法,以去除自然氧化膜時,孔徑直徑擴大5%以下,而可 抑制微影製程之偏差範圍内。其結果使得微細加工後的處 理步驟變得容易,並且可確保加工尺寸的邊緣,而可達成 半導體製造產率的提昇。
第16頁

Claims (1)

  1. 1 . 禋微細加 體表面或微細加工表面之=劑二:徵在於適:… /月洗、I虫刻或圖形化,其包括: 小於0. 1重量%的氫氟酸;以及 47重量%以下,且40重量%以上的氟化銨。 ,2甘如中請專利範圍第1項所記載的微細加工表面處理 1其為使氨氣溶解於氫氟酸溶液調製而成。 理叫3. t : Ϊ ί利^第1或2項所記載之微細加工表面處 理Μ,其中包含〇.〇0卜〇._重量%的界面活性劑。 劑,A Ϊ申f Ϊ利靶圍第3項所記載之微細加工表面處理 Γ H J 7界面活性劑為1種或2種以上的脂肪族胺 、LnH2n+1NH2 ; n = 7〜1 4)、η匕旺从 , 或脂肪族醇既1〇Η;二=魏 5使:=處理方法,其特徵在於: 便用申晴專利筋圖楚彳 以去除半導體之接觸的3項之微細加卫表面處理劑, 6.如申請專利範圍第5lg氧化膜為目的。 方法’其中上述接觸:的古員所記載之微細加工表面處理 7 , 安觸孔的直徑為〇 · 5 // m以ίγ。 .如申請專利範圍第^ 理方法,苴中卜、+、从弟b或6項所記載之微細加工表面處 8.如;:2妾觸孔為開口於氧化膜者。 理方法,豆中 弟或6項所記載之微細加工表面處 八Τ上迷氧化膜係CV]) 9·如申請專利範 ,、乳化膜。 方法,其中上述氧各圍弟員所記載之微細加工表面處理 專利轮圍第5或6項所記載之微細加工表面
    541356 秦 _案號88102968_年月曰 修正_ 六、申請專利範圍 處理方法,其中上述氧化膜係TEOS系氧化膜。 1 1.如申請專利範圍第7項所記載之微細加工表面處理 方法,其中上述氧化膜係TEOS系氧化膜。
    2015-2482-PFl.ptc 第18頁
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