TW201100437A - Solution based zirconium precursors for atomic layer deposition - Google Patents

Solution based zirconium precursors for atomic layer deposition Download PDF

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TW201100437A
TW201100437A TW099113373A TW99113373A TW201100437A TW 201100437 A TW201100437 A TW 201100437A TW 099113373 A TW099113373 A TW 099113373A TW 99113373 A TW99113373 A TW 99113373A TW 201100437 A TW201100437 A TW 201100437A
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precursor
deposition
substrate
compound
atomic layer
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Ce Ma
Kee-Chan Kim
Graham Anthony Mcfarlane
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Linde Ag
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    • 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
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    • 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
    • C23C16/455Chemical 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 introducing gases into reaction chamber or for modifying gas flows in reaction chamber
    • C23C16/45523Pulsed gas flow or change of composition over time
    • C23C16/45525Atomic layer deposition [ALD]
    • C23C16/45553Atomic layer deposition [ALD] characterized by the use of precursors specially adapted for ALD
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    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/02104Forming layers
    • H01L21/02107Forming insulating materials on a substrate
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    • H01L21/0226Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process
    • H01L21/02263Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase
    • H01L21/02271Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition
    • H01L21/0228Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition deposition by cyclic CVD, e.g. ALD, ALE, pulsed CVD

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Description

201100437 六、發明說明: 【發明所屬之技術領域】 本發明係關於一種用於原子層沉積之新穎且有用的以溶 液為主的前驅物。 本發明之以溶液為主的ALD前驅物係關於由本申請案之 發明者及受讓人實施之工作。特定言之,美國專利申請案 號11/400904係關於使用用於ALD之以溶液為主的前驅物之 方法及裝置。美國專利申請案號12/396806係關於使用用 Ο 於ALD之以溶液為主的前驅物之方法及裝置。美國專利申 請案號12/3739 13係關於使用用於ALD之以溶液為主的前 驅物之方法。美國專利申請案號12/374066係關於蒸發及 傳送用於ALD之以溶液為主的前驅物之方法及裝置。美國 專利申請案號12/2611 69係關於用於ALD之以溶液為主的鑭 前驅物。 【先前技術】 原子層沉積(ALD)係一種用於先進薄膜沉積之致能技 術,其提供令人滿意的厚度控制及階梯覆蓋。此外,ALD 係一種可於矽晶圓處理中提供新一代導體障壁層、高介電 常數閘極介電層、高介電常數電容層、覆蓋層及金屬閘電 極之致能技術。ALD生長之高介電常數及金屬閘極層業已 展現超越物理氣相沉積及化學氣相沉積方法之優勢。ALD 亦已應用於諸如平板顯示器、化合物半導體、磁學及光學 儲存、太陽能電池、奈米技術及奈米材料之其他電子工 業。ALD係用於在傭環沉積方法中一次一層地建造超薄且 147735.doc 201100437 高保形的金屬、氧化物、氮化物及其他層。業已藉由ald 方法利用氧化或氮化反應製造許多主族金屬元素及過渡金 屬元素(諸如鋁、鈦、鍅、铪、及钽)之氧化物及氮化物。 亦可利用ALD方法經由還原或燃燒反應沉積諸如Ru、、 Ta及其他之純金屬層。 ALD方法之廣泛採用面臨涉及有限的合適前驅物選擇、 低晶圓生產量及低化學利用率之挑戰。於HKMGt有用的 許多ALD前驅物係以具有相對低之揮發性之固相存在。為 克服此等挑戰,本發明發展一種名為Flex-ALDTM2以溶液 前驅物為主的ALD技術。藉由以溶液為主的前驅物技術, ALD前驅物選擇將得以大幅地擴增以包括低揮發性固體前 驅物’曰曰曰圓生產量隨著車交高的膜生長率而升高,且化學利 用經由稀釋化學品之使用而改良。此外,藉由蒸氣脈衝之 液體注射會提供均一的前驅物劑量。 典型的ALD方法使用連續的前驅物氣體脈衝以一次一層 也"L·積膜。特疋吕之,將第一前驅物氣體導入處理室,及 於《亥至内中之基板表面處藉由反應製造單層。然後導入第 一刖驅物來與該第—前驅物反應並於基板上以由第一前驅 物與第二前驅物兩組份構成而形成單層膜。每一對脈衝 (-,盾,)會製造單層或更少層的膜,其容許根據實施的沉 積循%次數極精確地控制最終膜厚度。 半導體裝置之堆積越來越致密,通道長度亦需製得 於來越紐對於未來的電子設備技術,其將需求以具有小 於1 ·5 nm之有效氧化物厚度(EQT)之超薄高介電常數氧化 147735.doc 201100437 物替代Si〇2及SiON閘極介電質。較佳地,高介電常數材料 應具有高帶隙及帶偏移、高介電常數值、於矽上之良好穩 定性、最小化的Si〇2界面層、及於基板上之高品質界面。 亦期望非晶性或高結晶溫度膜。 氧化锆(Zr〇2)係一種用於先進CMOS設備中之可希望的 ^ 高介電常數介電材料,因其具有相對穩定的介電常數(3〇 至40)。已發現,藉由還原界面層,同時保留有效的高介 電常數值,Zr〇2係一種用於πι-ν族高電子遷移率通道之較 佳閘極介電質。此外,Zr〇2可用作32 nm2DRAM技術節 點及以後之記憶容量材料。 ALD係一種沉積超薄Zr〇2層之較佳方法且—般係基於使 用以醯胺或Cp為主的液體前驅物。然而,針對習知前驅物 使用標準ALD沉積技術需要高來源溫度,其會導致過早的 前驅物分解。為克服此問題,可直接注射以醯胺為主的前 驅物,諸如TEMAZ或TMAZr,然而該等分子於沉積溫度 ❹下不穩定,其會導致類CVD自生長,進而損失均勻沉積之 品質及控制能力。 於本技藝中仍需求改良以溶劑為主的ALD前驅物。 【發明内容】 本發明提供一種經改良之以溶劑為主的前驅物配方。特 定言之,本發明提供一種以自限制且保形方式生長Zr〇2或 其他ZHb合物膜之以溶液為主的無氧錯ALD前驅物。 【實施方式】 本發明提供用作ALD前驅物之以Zr為主的材料。首先, 147735.doc 201100437 評價一新種類的含有除金屬-碳鍵之外還含有金屬-氧鍵之 基於環戊二烯基(Cp)之前驅物。此等含氧前驅物展現高分 解溫度,然而其等並未經證實係理想的ALD材料。其一原 因係大部份無氧Cp前驅物於室溫下呈固態及因此需要高來 源溫度。 特定言之,評論含氧Cp複合物、TEMAZ及 (MeCp)2Zr(OMe)(Me)。發現TEMAZ係熱不穩定且 (MeCp)2Zr(OMe)(Me)展現自生長。據信於前驅物中存在氧 會實質上導致自生長。 考慮到含氧前驅物所遭受之以上問題,本發明係關於使 用無氧Cp銼前驅物形成真Zr02之ALD膜。特定言之,本發 明係關於具有以下化學式中之一者之無氧Cp Zr複合物: (MeCp)2ZrMe2、(Me5Cp)2ZrMe2 或(t-BuCp)2ZrMe2,其各自 將於下文分別論述。 單支鏈Cp環前驅物(MeCp)2ZrMe2不穩定,因此無法證實 可用作ALD前驅物。甲基飽和之Cp環前驅物 (Me5Cp)2ZrMe2展現甚差的溶解度,故亦無法用作ALD前 驅物。 關於無氧以溶液為主的ALD前驅物之最佳候選物係(t-BuCp)2ZrMe^可於室溫下以大於0·2Μ之溶解度將此固體 前驅物溶於諸如正辛烷之經純化的溶劑中。該固體前驅物 及該溶劑均不含氧。用於ALD應用之溶液濃度較佳係0.05 Μ至0.15 Μ且更佳係0.1 Μ。 可藉由直接液體注射方法於室溫下將溶於溶劑之以溶液 147735.doc 201100437 為主的前驅物(即’(t-BuCp^ZrMe2),傳送至使用點蒸發 器。隨後利用惰性氣體開關使經完全蒸發之溶液前驅物搏 動進入沉積室中以建立ALD前驅物傳送之理想方波。該蒸 發器溫度係較佳介於15(TC與250。(:之間,且更佳係 190。。。 % 使用本發明之岫驅物配方’於含有使用石英晶體微量天 平之就地生長監視器之熱壁室中沉積Zr〇2及其他心化合物 0 膜。用於Zr〇2膜之氧前驅物係水蒸氣、臭氧或其他含氧氣 體或蒸氣。特定言之,氧前驅物可為水蒸氣、〇2、…、 N20、NO、C〇、c〇2、CH3〇H、C2H5〇H、其他醇其他 酸及氧化劑。較佳的氧化劑前驅物係於室溫下來自去離子 水蒸氣源之水蒸氣。膜生長溫度較佳係18〇。(:至28〇。(:,且 更佳係2G0°C至240°C。生長之飽和度係藉由增加△前驅物 劑量或水蒸氣劑量測試。其表明該生長係真自限制ALD生 長而不含自生長。 Ο 此外,氮化錘膜可根據本發明藉由將諸如nh3、n2h4、 胺等之含氮反應物用作第二前驅物製得。相似地,金屬鍅 ALD膜可藉由將氫氣、氫原子或其他還原劑用作第二前驅 物形成。 鍅前驅物溶液亦可包含其他溶劑及添加劑。然而,此等 溶劑及添加劑必須不干擾氣相中或基板表面上之ALD處 理此外’該等溶劑及添加劑在ALD處理溫度下應係执穩 定而不^分解。烴適宜作為主要溶劑以藉㈣拌或超聲^ 混口(右必要)之方法溶解ALD前驅物。烴係化學惰性且可 147735.doc 201100437 =驅=目容且不會與該等前驅物競爭基板表面上之反應 免m =溶劑之满點應高得足以匹配溶f之揮發性以避 免於4¾處理期間產生顆粒。 本二月之前驅物提供數種優勢,包括可將固體前驅物用 埶^夜為主的ALD處理。藉由使用此等化學,使低 …、异之至溫傳送成為可能並因此克服與諸如temar =準㈣前驅物有關之熱分解問題。本發明之以Cp為主之 合液二驅物係熱穩定的,且採用無氧溶液化學會消除因含 氧Cp $驅物而發生之自生長。 ^發明之_物可用於數種應用中。料言之,本發明 W㈣"Γ用於形成用於基於si' Ge及(^IV族元素半導 體之高介電常數閘極介電層或形成用於㈣心、㈣士 =其他m至v族高電子遷移率半導體之高介電常數間極介 電層。此外,本發明之前驅物可用於形成用於dram、快 閃及鐵電記憶設備之高介電常數電容器。本發明之前驅物 亦可用作氣體純化、有機合成、燃料電池膜及化學偵測 °" X及於燃料电池中之經釔穩定氧化鍅(YZT)固體陽極 材料中之基於Zr之觸媒’或用作於約100 κ下維持液相之 過冷的基於Zr之合金。 預期藉由參照以上論述,本發明之其他實施例及變化可 輕易地為熟練技術者瞭解,且期望此等實施例及變化同樣 包含於後附申請專利範圍所列出之本發明範圍内。 147735.doc

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  1. 201100437 七、申請專利範圍: 1. 一種用於原子層沉積之前驅物,其包含無氧鍅環戍二婦 基化合物。 2. 如請求項1之前驅物,其中該化合物具有下式: (RiR2R3R4R5Cp)2MR6R7 其中 Ri、R2、R3、R4、R5、或具有式 CnHm2 烴,其中n=l至10且m=1至2n+1,Cp係環戊二烯基且厘係 IV族元素。 〇 1 2.如請求項2之前驅物,其包含(t_BuCp)2ZrMe2。 4.如請求項3之前驅物,其係溶於溶劑以形成前驅物溶 液。 5·如請求項4之前驅物,其中該溶劑係正辛烷且該前驅物 溶液具有〇.05 Μ至0.15 Μ之濃度。 6. 如請求項3 4之前驅物,其中該濃度係〇.1Μβ 7. 一種氧化鍅膜,此膜係使用包含無氧鍅環戊二烯基化合 Q 物之前驅物藉由原子層沉積而沉積製得。 8. 如°月求項7之膜,其中該前驅物係(t-BuCp)2ZrMe2。 9. 種氮化锆膜,此膜係使用包含無氧锆環戊二烯基化合 物之前驅物藉由原子層沉積而沉積製得。 1 月驅物藉由原子層沉積製得。 2 12.如凊求項"之膜,其中該前驅物係(t_BuCp)2ZrMe2。 3 Π· 一種原子層沉積之方法,其包含: 4 147735.doc 201100437 將溶於溶劑之包合I董 〜巴3無軋锆環戊二烯基化合物之 驅物導入一蒸發器; 蒸發該蒸發5| + > # & ^ 益中之该第一則驅物溶液; 將經蒸發之笫—i 私你 弟别驅物傳送至沉積室; 藉由基板上之表面反應形成含鍅分子之單層; 沖洗該沉積室; 將έ氧化合物之第二前驅物導入該沉積室; 藉由該基板上之表面反應形成氧化錯之單層;及 重複A等步驟以於該基板上製造具預定厚度之氧化錯 膜。 。 14.如明求項13之方法,其中傳送該經蒸發之第一前驅物包 含以理想方波之形式傳送該第一前驅物。 15·如請求項13之方法,其中導入該第二前驅物包含以理想 方波之形式傳送該第二前驅物。 16_如明求項13之方法,其中該蒸發器之溫度係介於150°C 與250 C之間且該沉積溫度係介於18(Γ(:與28〇0C之間。 17.如請求項16之方法’其中該蒸發器之溫度係l9(rc且該 沉積溫度係介於2〇0°c與24〇。〇之間。 18·如請求項13之方法,其中該第二前驅物係水蒸氣、〇2、 〇3、N20、N〇、CO、C02、CH3OH、C2H5OH、醇、酸 或氧化劑。 19. 一種原子層沉積方法,其包含: 將溶於溶劑之包含無氧锆環戊二烯基化合物之第一前 驅物導入蒸發器; 147735.doc 201100437 热發該蒸發器中之該第一前驅物溶液; 將該經蒸發之第一前驅物傳送至沉積室; 藉由基板上之表面反應形成含錘分子之單層; 沖洗該沉積室; 將包含含氮化合物之第二前驅物導入該沉積室; 藉由該基板上之表面反應形成氮化锆之單層;及 重複該等步驟以於該基板上製造具預定厚度之氣化生 膜。 ’雀。 Ο 20· t請求項19之方法,其中傳送該經蒸發之第—前驅物包 含以理想方波之形式傳送該第一前驅物。 21.如請求項19之方法,其中導入該第二前驅物 w b Μ理相 方波之形式傳送該第二前驅物。 、 22·如請求項19之方法,其中第二前驅物係νη3、N2H D、 胺。 2 4或 23. —種原子層沉積方法,其包含: 〇 將溶於溶劑之包含無氧锆環戊二烯基化合物之笛 驅物導入蒸發器; 第-前 蒸發該蒸發器中之該第一前驅物溶液; 將&蒸發之第一前驅物傳送至沉積室; 藉由基板上之表面反應形成含锆分子之單層; 沖洗該沉積室; 將包含還原劑之第二前驅物導入該沉積室; 藉由該基板上之表面反應形成锆金屬單層;及 重複該等步驟以於該基板上製造具預定厚度之錯金屬 147735.doc 201100437 膜。 之第一前驅物包 24·如請求項23之方法,其t傳送該經蒸發 含以理想方波之形式傳送該第—前驅物 前驅物包含以理想 25.如請求項23之方法,其中導入該第二 方波之形式傳送該第二前驅物。 26_如請求項23之方法,其中該還原劑係氣氣或氫原子 147735.doc 4- 201100437 四、指定代表圖: (一) 本案指定代表圖為:(無) (二) 本代表圖之元件符號簡單說明: 五、本案若有化學式時,請揭示最能顯示發明特徵的化學式: (無) 147735.doc -2-
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