CN103430291A - 用于恢复及封孔受损的低介电常数薄膜的紫外线辅助硅烷化 - Google Patents
用于恢复及封孔受损的低介电常数薄膜的紫外线辅助硅烷化 Download PDFInfo
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- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
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- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
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- H01L21/76801—Applying 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
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Abstract
提供了用于修复受损的低介电常数薄膜的方法。对低介电常数薄膜的损坏发生在处理薄膜期间,诸如,在蚀刻、灰化及平坦化期间。对低介电常数薄膜的处理使水储存在薄膜的孔中且进一步使亲水性化合物形成在低介电常数薄膜结构中。结合紫外线(UV)辐射及硅烷化化合物的修复工艺自孔移除水且进一步自低介电常数薄膜结构移除亲水性化合物。
Description
发明背景
技术领域
所描述的方法大体而言涉及修复并降低用于半导体制造的低介电常数薄膜的介电常数。
现有技术
半导体制造中的介电薄膜的介电常数(k)随着器件比例继续缩小而不断地减小。最小化对低介电常数(低k)薄膜的整合损坏对于能够继续减小特征尺寸十分重要。然而,随着特征尺寸缩小,电阻电容的改良及介电薄膜的可靠性变为极大的挑战。
用于蚀刻或灰化介电薄膜的当前技术涉及产生水(H2O)作为副产物的工艺化学。可将水副产物引入至经沉积介电薄膜中,藉此增加介电薄膜的k值。同样,用于移除氧化铜(CuO)及化学机械平坦化(CMP)残余物的当前技术涉及使用氨(NH3)或氢(H2)等离子体。移除氧化铜及CMP残余物对于改良金属化结构的电迁移(EM)及层间介电(inter level dielectric,ILD)薄膜的时间相关介电质击穿(TDDB)是必要的。然而,将低介电常数薄膜暴露于NH3及H2等离子体修改薄膜结构且增加k值。现在的修复技术涉及液相硅烷化或者使用超临界CO2。然而,这些技术尚未证明对修复薄膜中的凹入特征的侧壁损坏是有效的。
因此,用于修复介电薄膜以降低k值的方法对于改良效率且允许较小器件尺寸是必要的。
发明内容
根据本发明的实施例大体而言涉及用于修复并降低用于半导体制造的低介电常数薄膜的介电常数的方法。
一种修复受损低介电常数介电薄膜的方法包括:至少两次交替性地将介电薄膜暴露于紫外线(UV)辐射及硅烷化化合物。
另一种方法包括:将介电薄膜暴露于硅烷化化合物;将氧化硅层沉积至介电薄膜上;以及将介电薄膜及氧化硅层暴露于紫外线(UV)辐射。
附图说明
因此,可详细地理解上述特征的方式,即上文简要概述的更特定描述可参照实施例进行,一些实施例图示在附图中。然而,应注意,附图仅图示典型实施例,且因此不应视为对本发明范围的限制,描述可建议其它等效的实施例。
图1A至图1F图示在处理的各个阶段期间的介电层。
图2A图示使用所述处理工艺的介电薄膜的水接触角与受损介电薄膜(作为对照)的水接触角相比较的增加。
图2B图示使用本文所述的处理工艺的介电薄膜的介电常数(k值)与受损介电薄膜及未受损介电薄膜(作为正对照及负对照)的介电常数(k值)相比较的减小。
图2C图示在FTIR(傅立叶变换红外光谱法)下的结果,所述结果显示用本文所述的一个或多个处理及修复工艺处理的介电薄膜的氢键结的硅醇基(group)与受损介电薄膜(作为负对照)的FTIR光谱法相比较的减少。
具体实施方式
所描述的实施例大体而言涉及用于修复用于半导体制造中的低介电常数薄膜的介电常数(k值)及降低用于半导体制造中的低介电常数薄膜的介电常数(k值)的方法。
图1A图标沉积至结构101上的介电薄膜100。结构101可为基板(诸如举例而言,硅晶圆)或者先前形成的层(诸如举例而言,金属化层或互连层)。介电薄膜100可为含有多孔硅的低介电常数薄膜,诸如举例而言,SiO2薄膜、SiOC薄膜、SiON薄膜、SiCOH薄膜、SiOCN薄膜、或者其它相关薄膜。介电薄膜100可具有形成在所述介电薄膜100中的孔102。
图1B图示在经平坦化且经蚀刻以使特征(例如,104)形成在介电薄膜100中之后的介电薄膜100。例如,介电薄膜100可能已藉由化学机械平坦化(CMP)工艺来平坦化。例如,介电薄膜100可能已藉由以下步骤来蚀刻:遮蔽介电薄膜100的一部分;将介电薄膜100的未遮蔽部分与自氢氟酸(HF)蒸汽形成的等离子体接触;以及使用自氧气(O2)气体或CO2气体形成的等离子体灰化掉遮蔽物。
例如,介电薄膜100的平坦化工艺、灰化工艺及蚀刻工艺将氢气和/或水引入至介电薄膜100中,从而使Si-OH基形成,所述Si-OH基使得介电薄膜100为亲水性的。介电薄膜100的亲水性使孔102填充有水,所述水产生不良效应,使得载水的孔随后被识别为受损孔103。Si-OH基与受损孔103两者的存在以非期望的方式增加介电薄膜100的k值,且存在Si-OH或受损孔103的位置被视为受损。因平坦化及蚀刻受损的位置通常位于介电薄膜100的上部且位于特征(例如,104)的侧壁,如图1B中所示。
图1C图示在已藉由一个或多个工艺修复之后的介电薄膜100,下文描述所述一个或多个工艺。例如,修复工艺藉由自受损孔103移除水,藉此产生经修复孔105,且藉由将介电薄膜100中的Si-OH基转化成疏水性的Si-O-Si(CH3)3基,来减小介电薄膜100的k值。疏水性的Si-O-Si(CH3)3基辅助将水驱出受损孔103。当与未修复受损介电薄膜的介电常数(k值)相比较且与未受损介电薄膜的介电常数(k值)相比较(分别作为正对照及负对照)时,使用所述处理工艺修复的受损介电薄膜(从而变为经修复介电薄膜)的介电常数(k值)显著地减小。
此外,当在使用本文所述的处理及修复工艺之后与受损介电薄膜(用作对照)的水接触角相比较时,所得经修复介电薄膜显示水接触角的增加。此外,当使用FTIR(傅立叶变换红外光谱法)分析经修复介电薄膜的键结性质时,存在于受损介电薄膜中的氢键结的硅醇基的数目在用下文描述的修复工艺中的一个或多个修复工艺处理受损介电薄膜之后已显著地减少(与作为负对照的未修复受损介电薄膜的FTIR光谱法相比较)。
在一个实施例中,受损介电薄膜100可藉由气相硅烷化工艺来修复。气相硅烷化工艺包含:将介电薄膜100与气化的硅烷化化合物接触,以在介电薄膜100中产生Si-O-Si(CH3)3基。气化硅烷化化合物允许所述硅烷化化合物深入地渗透至介电薄膜100中。硅烷化化合物可为六甲基二硅氮烷(HMDS)、四甲基二硅氮烷(TMDS)、三甲基氯硅烷(TMCS)、二甲基二氯硅烷(DMDCS)、甲基三氯硅烷(MTCS)、三甲基甲氧基硅烷(TMMS)(CH3-Si-(OCH3)3)、二甲基二甲氧基硅烷(DMDMS)((CH3)2-Si-(OCH3)2)、甲基三甲氧基硅烷(MTMS)((CH3)3-Si-OCH3)、苯基三甲氧基硅烷(PTMOS)(C6H5-Si-(OCH3)3)、苯基二甲基氯硅烷(PDMCS)(C6H5-Si-(CH3)2-Cl)、二甲基胺基三甲基硅烷(DMATMS)((CH3)2-N-Si-(CH3)3)、双(二甲基胺)二甲基硅烷(BDMADMS)、或者含有Si、H及C的其它化合物。
气相硅烷化工艺可藉由以下步骤来执行:将介电薄膜100放置到处理腔室中,气化硅烷化化合物,以及使经气化硅烷化化合物流动至处理腔室中。硅烷化化合物可替代性地在处理腔室中气化。可将硅烷化化合物经由喷淋头引入至处理腔室中,所述喷淋头定位在处理腔室的上部处。诸如He之类的载气可用以辅助将硅烷化化合物引入至处理腔室中。此外,可在气相硅烷化工艺期间添加诸如水之类的催化剂。气相硅烷化工艺可在介于约50毫托与约500托之间(诸如,6托)的处理腔室压力、介于约100℃与约400℃之间(诸如,385℃)的介电薄膜温度、介于约0.5g/min与约5g/min之间(诸如,1g/min)的硅烷化化合物流动速率、以及介于约1分钟(min)与约10分钟之间(诸如,3分钟)的处理时间下执行。处理腔室压力在气相硅烷化工艺期间可在例如约50托与约500托之间变化。
在另一实施例中,介电薄膜100可藉由使用紫外线(UV)固化工艺来修复。紫外线固化工艺包含:将介电薄膜100暴露于紫外线辐射,以自受损孔移除水并在以上所述的介电薄膜100中产生Si-O-Si(CH3)3基。紫外线固化工艺可藉由以下步骤来执行:将介电薄膜100放置到处理腔室中,并且使介电薄膜100暴露于紫外线辐射源,所述紫外线辐射源具有足够的能量来驱动起始且驱动所述工艺。例如,紫外线辐射源可为紫外线灯。例如,紫外线辐射源可定位在处理腔室的外部,所述处理腔室具有惰性气体(诸如,He或Ar)环境及石英窗,紫外线辐射可穿越所述石英窗。处理腔室还可包括微波源,以在将介电薄膜100暴露于紫外线辐射之前或与将介电薄膜100暴露于紫外线辐射同时加热介电薄膜100。还可使用等离子体模拟紫外线辐射波长,来执行紫外线固化工艺。可藉由将RF功率耦接至诸如He、Ar、O2及N2之类的处理气体,来形成等离子体。紫外线固化工艺可在介于约1托与约100托之间(诸如,6托)的处理腔室压力、介于约20℃与约400℃之间(诸如,385℃)的介电薄膜温度、介于约8slm与约24slm之间(诸如,16slm)的处理腔室环境(非处理)气体流动速率、介于约2slm与约20slm之间(诸如,12slm)的处理气体流动速率、介于约50W与约1000W之间(诸如,500W)的RF功率、13.56MHz的RF功率频率、介于约10秒与约180秒之间(诸如,60秒)的处理时间、介于约100W/m2与约2000W/m2之间(诸如,1500W/m2)的紫外线辐照度下、以及使用介于约100nm与约400nm之间的紫外线波长来执行。以上所述的紫外线固化工艺发挥作用以修复特征(例如,104)的侧壁中的受损孔103。
在另一实施例中,可使用以上所述的气相硅烷化工艺并接着使用以上还描述的紫外线固化工艺来修复介电薄膜100,或者反之亦然。还可原位(in-situ)且在相同腔室中执行两个工艺。举例而言,处理腔室可含有喷淋头及石英窗,所述喷淋头及所述石英窗可整合成单一部件。
在另一实施例中,介电薄膜100可使用工艺来修复,所述工艺包括紫外线固化工艺、接着使用的气相硅烷化工艺、以及随后接着使用的额外紫外线固化工艺。三阶段工艺操作以自受损孔103移除水,以便硅烷化化合物可渗透且修复受损孔103。最初的紫外线固化自介电薄膜100的表面且自特征(例如,104)的侧壁移除水,气相硅烷化恢复薄膜的疏水性,并且额外的紫外线固化完成介电薄膜100的修复。可在单一处理腔室中或多个处理腔室中执行所述工艺。
在另一实施例中,介电薄膜100可藉由原位脉冲硅烷化及紫外线固化工艺来修复。原位脉冲硅烷化及紫外线固化工艺可藉由以下步骤来执行:将介电薄膜100放置到处理腔室中且交替性地将介电薄膜100暴露于紫外线辐射,并且随后与硅烷化化合物接触。举例而言,在原位脉冲硅烷化及紫外线固化工艺的一部分中,可将紫外线辐射源暴露于介电薄膜100达约5秒与约10秒之间,并且随后自暴露切断所述紫外线辐射源。在原位脉冲硅烷化及紫外线固化工艺的另一部分中,可控制液体或气化硅烷化化合物(诸如,上文提及的硅烷化化合物中的一种硅烷化化合物)流动至处理腔室中达约5秒与约10秒之间,以与介电薄膜100接触,并且随后可停止流动。可按需重复原位脉冲硅烷化及紫外线固化工艺的两个步骤,以实现介电薄膜100的期望修复。举例而言,可重复原位脉冲硅烷化及紫外线固化工艺的两个步骤,例如,重复2次、3次、10次等。应理解,两个步骤中的任一步骤可开始修复程序且随后接着使用另一步骤。可将硅烷化化合物经由定位在处理腔室的上部的喷淋头引入至处理腔室中,紫外线辐射源可为定位在处理腔室的外部的紫外线灯,并且处理腔室可具有石英窗,紫外线辐射可穿越所述石英窗。原位脉冲硅烷化及紫外线固化工艺可在介于约1托与约500托之间(诸如,6托)的处理腔室压力、介于约100℃与约400℃之间(诸如,385℃)的介电薄膜温度、介于约0.5g/min与约5g/min之间(诸如,1g/min)的硅烷化化合物流动速率、介于约10秒与约600秒之间(诸如,180秒)的总处理时间、介于约100W/m2与约2000W/m2之间(诸如,1500W/m2)的紫外线辐照度下、并且使用介于约100nm与约400nm之间的紫外线波长来执行。
在另一实施例中,介电薄膜100可藉由原位硅烷化及紫外线固化工艺来修复。原位硅烷化及紫外线固化工艺可藉由以下步骤来执行:将介电薄膜100放置到处理腔室中,使液体或气化硅烷化化合物(诸如,上文提及的硅烷化化合物中的一种硅烷化化合物)连续流动至处理腔室中以与介电薄膜100接触,并且同时将介电薄膜100暴露于脉冲紫外线辐射。可将硅烷化化合物经由定位在处理腔室的上部的喷淋头引入至处理腔室中,紫外线辐射源可为定位在处理腔室的外部的紫外线灯,并且处理腔室可具有石英窗,紫外线辐射可穿越所述石英窗。原位硅烷化及紫外线固化工艺可在介于约1托与约500托之间(诸如,6托)的处理腔室压力、介于约100℃与约400℃之间(诸如,385℃)的介电薄膜温度、介于约0.5g/min与约5g/min之间(诸如,1g/min)的硅烷化化合物流动速率、介于约10秒与约600秒之间(诸如,180秒)的总处理时间、介于约100W/m2与约2000W/m2之间(诸如,1500W/m2)的紫外线辐照度下、并且使用介于约100nm与约400nm之间的紫外线波长来执行。
在另一实施例中,介电薄膜100可藉由三阶段程序来修复,所述三阶段程序包括硅烷化工艺、低温共形氧化硅沉积工艺、以及紫外线固化工艺。硅烷化工艺及紫外线固化工艺可类似于最初以上所述的那些硅烷化工艺及紫外线固化工艺。低温共形氧化硅沉积工艺为用于沉积十分薄的层的原子层沉积(ALD)型工艺。在低温共形氧化硅沉积工艺中,藉由将介电薄膜100定位在处理腔室中且将介电薄膜100暴露于自含硅的前驱物形成的等离子体,来将共形籽晶层沉积至介电薄膜100上。随后用自含氧的前驱物形成的等离子体来处理共形籽晶层,藉此在介电薄膜100上形成氧化硅层。可重复所述工艺,直至形成期望厚度的氧化硅为止。
适合的含硅的前驱物可包括八甲基环四硅氧烷(OMCTS)、甲基二乙氧基硅烷(MDEOS)、双(叔丁胺基)硅烷(BTBAS)、三-二甲基胺基硅烷(TriDMAS)、硅烷、乙硅烷、二氯甲硅烷、三氯硅烷、二溴硅烷、四氯化硅、四溴化硅、或者上述前驱物的组合。在13.56MHz和/或350KHz的频率下,以约50W至约3000W的RF功率提供含硅的等离子体。可向腔室中的喷淋头(即,气体分配组件)和/或基板支撑件提供RF功率。喷淋头与基板支撑件之间的间隔可大于约230密耳,诸如,介于约350密耳与约800密耳之间。
含硅的前驱物可视需要包括载气,诸如,氦气、氮气、氧气、氧化亚氮、以及氩气。可以介于约5sccm与约1000sccm之间的流动速率引入含硅的前驱物。可以介于约100sccm与约20000sccm之间的流动速率引入视需要的载气,例如,氦气。含硅的前驱物(例如,八甲基环四硅氧烷)的流动速率与载气(例如,氦气)的流动速率的比率为约1:1或大于1:1,诸如,介于约1:1与约1:100之间。当含硅的前驱物流动至处理腔室中以沉积共形籽晶层时,处理腔室压力可大于约5毫托,诸如,介于约1.8托与约10托之间,并且介电薄膜100的温度可介于约125℃与约580℃之间,更特定地,温度介于约200℃与约400℃之间。
适合的含氧的前驱物可包括氧气(O2)气体或氧化亚氮(N2O)。可将含氧的前驱物以介于约100sccm与约20000sccm之间的流动速率引入至腔室中。可控制含氧的前驱物流动至腔室中达诸如介于约0.1秒与约120秒之间的处理时间。可藉由在13.56MHz和/或350KHz的频率下,在腔室中施加介于约50W与约3000W之间的RF功率,来提供氧等离子体。当含氧的前驱物流动至腔室中时,腔室压力可介于约5毫托与约10托之间,并且介电薄膜100的温度可介于约125℃与约580℃之间。用于含碳的等离子体工艺的适合处理腔室为可购自位于加利福尼亚州圣克拉拉市的应用材料公司的SNOWPECVD腔室。以上所述的三阶段程序有利地密封受损孔,所述受损孔可能已在以上论述的蚀刻工艺、灰化工艺或平坦化工艺期间破裂。
在另一实施例中,介电薄膜100可藉由含碳的等离子体工艺来修复。含碳的等离子体工艺可藉由以下步骤来执行:将介电薄膜100放置在处理腔室中,使含碳的前驱物气体(诸如,烃前驱物气体)流动至处理腔室中,将RF功率耦接至含碳的前驱物气体以形成等离子体,并且将介电薄膜100与含碳的等离子体接触。含碳的前驱物气体可包括乙烯、乙炔、丁二烯、α萜品烯(A-TRP)、甲烷、二环庚二烯(BCHD)、或者其它相关化合物。可将含碳的前驱物气体经由喷淋头引入至处理腔室中,所述喷淋头定位在所述处理腔室的上部处。用于含碳的等离子体工艺的适合处理腔室为可购自位于加利福尼亚州圣克拉拉市的应用材料公司的PECVD腔室。含碳的等离子体工艺可在介于1托与50托之间(诸如,10托)的处理腔室压力、介于约20℃与约400℃之间(诸如,300℃)的介电薄膜温度、介于约10sccm与约5000sccm之间(诸如,1000sccm)的含碳的前驱物气体流动速率、介于约10W与约1000W之间(诸如,300W)的RF功率、介于0.01MHz与300MHz之间(诸如,13.56MHz)的RF频率、以及介于约5秒与约600秒之间(诸如,60秒)的处理时间下执行。
图2A至图2C图示使用以上所述的修复工艺的益处。在图2A中,图示各种介电薄膜的水接触角。未受损介电薄膜通常呈现较大水接触角,例如,如图2A的数据栏7中所示的约102.5度,并且未受损介电薄膜为相对疏水性的。与未受损介电薄膜的水接触角相比较,受损介电薄膜通常呈现更小的水接触角。举例而言,如图2A的数据栏1及数据栏3中所示的两个示例性受损介电薄膜的水接触角为7.5度及13度,并且因此,受损介电薄膜更具亲水性。
图2A的数据栏2图示在将以上所述的一个气相硅烷化工艺用于受损介电薄膜上之后,已恢复至至少约82.6度的受损介电薄膜的水接触角的一个实例,所述受损介电薄膜的预修复状况图示在数据栏1中。图2A的数据栏4图示在将以上所述的另一气相硅烷化工艺用于受损介电薄膜上之后,已恢复至至少约76.2度的受损介电薄膜的水接触角的另一实例,所述受损介电薄膜的预修复状况图示在数据栏3中。图2A的数据栏5图示在将以上所述的紫外线固化工艺用于受损介电薄膜上之后,已恢复至至少约28.92度的受损介电薄膜的水接触角的另一实例,所述受损介电薄膜的预修复状况图示在数据栏3中。
此外,图2A的数据栏6图示在将以上所述的另一气相硅烷化工艺及原位紫外线固化工艺同时用于受损介电薄膜上之后,已恢复至至少约96.3度的受损介电薄膜的经恢复水接触角的另一实例,所述受损介电薄膜的预修复状况图示在数据栏3中。数据栏6的经修复介电薄膜的经恢复水接触角惊人地比数据栏2、4及5中所示的实例大得多,并且数据栏6的经修复介电薄膜的经恢复水接触角相对接近于数据栏7的未受损介电薄膜的水接触角(102.5度)。图2A中的结果显示使用本文所述处理工艺的介电薄膜的水接触角与受损介电薄膜(用作对照)的水接触角相比较的增加。
在图2B中,图示各种介电薄膜的介电常数(k值)。未受损低介电常数介电薄膜通常呈现较低介电常数。在一个实例中,低介电常数的未受损介电薄膜具有如数据栏10中所示的2.21的k值,并且未受损低介电常数介电薄膜可由各种不同处理损坏,所述处理将介电薄膜改变(变换)成受损介电薄膜,所述受损介电薄膜具有2.62的k值作为数据栏1中的受损介电薄膜的一个实例且具有2.52的k值作为数据栏5中的受损介电薄膜的另一实例。因此,一些沉积后处理工艺可损坏低介电常数介电薄膜,并且所得受损介电薄膜的介电常数(k值)比未受损介电薄膜的介电常数高10%至20%。
图2B的数据栏2及6图示在将以上所述的一个气相硅烷化工艺用于受损介电薄膜的实例上之后,已恢复至至少约2.54及约2.43的受损介电薄膜的介电常数的实例,所述受损介电薄膜的预修复状况分别图示在数据栏1及5(2.62及2.52的k值)中。数据栏2及6中经修复介电薄膜的2.54及2.43的k值与数据栏10中未受损介电薄膜的2.21的k值相比较仍过高。结果表明,气相硅烷化工艺修复受损介电薄膜的介电常数且使受损介电薄膜的介电常数值降低介于约2%与约6%之间。
图2B的数据栏7图示在将以上所述的紫外线固化工艺用于受损介电薄膜的实例上之后,已修复至至少约2.45的受损介电薄膜的介电常数的一个实例,所述受损介电薄膜的预修复状况图示在数据栏5中。结果显示,紫外线固化工艺在恢复受损介电薄膜的k值方面可与硅烷化工艺效果相当,通常显示受损介电薄膜的介电常数降低介于约2%与约6%之间。
图2B的数据栏3及8图示将气相硅烷化工艺及紫外线固化工艺连续用于受损介电薄膜上的两个实例,所述受损介电薄膜的预修复状况分别图示在数据栏1及5中。藉由硅烷化工艺及紫外线固化工艺的连续的经组合处理恢复且修复受损介电薄膜并降低受损介电薄膜的k值。此外,藉由使用硅烷化工艺及紫外线固化工艺的连续的经组合处理,如数据栏3及8中所示的经修复介电薄膜的2.4及2.36的所得k值比数据栏2、6及7中经修复介电薄膜的2.54、2.43及3.45的k值更低,所述数据栏2、6及7中经修复介电薄膜仅使用硅烷化工艺或者紫外线固化工艺的单一处理步骤。
此外,已发现,在处理腔室内部使用基板的多步骤或同时执行的原位处理可比仅使用单一处理步骤工艺更佳地恢复且修复受损介电薄膜,在所述基板上具有受损介电薄膜。例如,基板的多步骤原位处理可为将基板同时暴露于气相硅烷化工艺及原位紫外线固化工艺达预定处理时间,而不将基板带出处理腔室。另一实例为将基板同时暴露于原位脉冲硅烷化及紫外线固化工艺(例如,将基板暴露于气相硅烷化化合物)达预定处理时间(例如,连续地或以较短的5-10秒脉冲)且暴露于原位紫外线固化工艺达另一处理时间(例如,连续地或以较短的5-10秒脉冲)。
图2B的数据栏4及9图示使用原位气相硅烷化及紫外线固化工艺(例如,同时用气相硅烷化化合物及紫外线辐射处理具有受损介电薄膜的基板,所述受损介电薄膜的预修复状况图示在数据栏1及5中)的两个实例的结果。分别与数据栏1及5中的起始受损介电薄膜的介电常数2.62及2.52相比较,经修复介电薄膜的介电常数(k值)为数据栏4及9中所示的约2.38及约2.32。数据栏4及9中的结果显示原位硅烷化及紫外线固化工艺比连续的经组合硅烷化及紫外线固化工艺更佳,通常受损介电薄膜的介电常数降低介于约6%与约20%之间。原位气相硅烷化及紫外线固化工艺不仅可降低受损介电薄膜的介电常数而且可将受损介电薄膜修复并恢复至介电常数值与未受损介电薄膜的2.21的原始k值相当的程度。
图2C图示FTIR(傅立叶变换红外光谱法)的结果图,所述结果图图示用本文所述的一个或多个处理/修复工艺处理的介电薄膜的氢键结的硅醇基与受损介电薄膜(用作负对照)的FTIR光谱法相比较的减少。在图2C中,虚线(the dotted line)图示受损介电薄膜的FTIR结果(建立负对照水平),从而显示在约3000(cm-1)至3500(cm-1)的波数处的较高吸收且指示较大数目的Si-OH键。点划线(the long and short dashed line)图示使用以上所述的硅烷化工艺的经修复介电薄膜的FTIR结果,从而图示与受损负对照水平相比较的减少的Si-OH键。
在图2C中,实线图示使用以上所述的原位硅烷化及紫外线固化工艺的经修复介电薄膜的FTIR结果,从而图示与单一硅烷化处理工艺的FTIR结果(点划线)及受损负对照的FTIR结果(虚线)相比较的减少的Si-OH键。波数3000(cm-1)至3500(cm-1)周围的吸收的显著减小指示Si-OH键的数目减小,例如,Si-OH键可转换成Si-O-Si(CH3)3键及其它键。
在已修复介电薄膜100之后,可执行后续工艺,以继续制造半导体基板。举例而言,如图1D中所示,可将扩散阻挡层106沉积至介电薄膜100的特征(例如,104)中,并且可将诸如举例而言铜或铜合金的金属材料107沉积至特征(例如,104)中。可能有必要平坦化金属材料107且自金属材料107移除可能在平坦化期间形成的任何氧化物。常见的金属氧化物移除技术涉及使用氢等离子体或氨等离子体。平坦化工艺和/或金属氧化物移除工艺可能再损坏介电薄膜100的表面,如图1E中所见。可使用以上所述的修复工艺中的任何修复工艺来修复介电薄膜100,如图1F中所见。
所述修复工艺有效地降低受损介电薄膜的k值,因此使半导体器件特征的比例能够继续缩小。
尽管上文涉及所述实施例,但可在不脱离本发明的基本范围的情况下设计根据本发明的其它及进一步实施例,并且本发明的范围由以下权利要求书决定。
Claims (15)
1.一种修复受损介电薄膜的方法,所述方法包含:
将基板放置到处理腔室中,在所述基板上具有所述受损介电薄膜;
将硅烷化化合物气化成气化硅烷化化合物的流;
在所述处理腔室中将所述基板暴露于所述气化硅烷化化合物的所述流达第一处理时间,并在相同的处理腔室中将所述基板原位暴露于紫外线(UV)辐射达第二时段,将所述基板设置于相同的处理腔室中,而不将所述基板带出所述处理腔室。
2.如权利要求1所述的方法,所述方法进一步包含:使一种或多种惰性气体流动至所述处理腔室中。
3.如权利要求1所述的方法,所述方法进一步包含:
在所述处理腔室中自He、Ar、O2或N2气体中的至少一种形成等离子体。
4.如权利要求1所述的方法,所述方法进一步包含:
在将所述基板暴露于所述气化硅烷化化合物的所述流之前或者与将所述基板暴露于所述气化硅烷化化合物的所述流同时,将所述基板加热至介于约100℃与约400℃之间的基板温度,在所述基板上具有所述受损介电薄膜。
5.如权利要求1所述的方法,其中在将所述基板原位暴露于紫外线(UV)辐射之前或者与将所述基板原位暴露于紫外线(UV)辐射同时,将所述基板暴露于所述气化硅烷化化合物的所述流。
6.如权利要求1所述的方法,其中在所述硅烷化化合物流动至所述处理腔室中之前,将所述硅烷化化合物气化成气相。
7.如权利要求1所述的方法,其中所述硅烷化化合物选自由以下组成的群组:六甲基二硅氮烷(HMDS)、四甲基二硅氮烷(TMDS)、三甲基氯硅烷(TMCS)、二甲基二氯硅烷(DMDCS)、甲基三氯硅烷(MTCS)、三甲基甲氧基硅烷(TMMS)(CH3-Si-(OCH3)3)、二甲基二甲氧基硅烷(DMDMS)((CH3)2-Si-(OCH3)2)、甲基三甲氧基硅烷(MTMS)((CH3)3-Si-OCH3)、苯基三甲氧基硅烷(PTMOS)(C6H5-Si-(OCH3)3)、苯基二甲基氯硅烷(PDMCS)(C6H5-Si-(CH3)2-Cl)、二甲基胺基三甲基硅烷(DMATMS)((CH3)2-N-Si-(CH3)3)、双(二甲基胺)二甲基硅烷(BDMADMS)、以及上述化合物的组合。
8.如权利要求1所述的方法,其中所述第一处理时间介于约10秒与约600秒之间。
9.如权利要求1所述的方法,其中自介于约100nm与约400nm之间的紫外线波长下且介于约100W/m2与约2000W/m2之间的紫外线辐射功率下的紫外线辐射源产生所述紫外线辐射。
10.如权利要求1所述的方法,所述方法进一步包含:
在将所述基板在所述处理腔室中暴露于所述气化硅烷化化合物的所述流、同时将所述基板原位暴露于紫外线(UV)辐射之前,将所述基板暴露于紫外线固化工艺。
11.如权利要求1所述的方法,其中将所述基板在所述处理腔室中暴露于所述气化硅烷化化合物的所述流、同时将所述基板原位暴露于紫外线(UV)辐射包含:
将所述基板连续暴露于所述气化硅烷化化合物的所述流达所述第一处理时间,同时以脉冲将所述基板原位暴露于紫外线(UV)辐射,每一脉冲介于约5秒与约10秒之间。
12.如权利要求1所述的方法,其中将所述基板在所述处理腔室中暴露于所述气化硅烷化化合物的所述流、同时将所述基板原位暴露于紫外线(UV)辐射包含:
交替性地将所述基板暴露于所述气化硅烷化化合物达介于5秒与10秒之间的脉冲且暴露于所述紫外线(UV)辐射达介于5秒与10秒之间的脉冲;以及
重复交替性地将所述基板暴露于所述气化硅烷化化合物的所述流及所述紫外线(UV)辐射。
13.如权利要求1所述的方法,所述方法进一步包含:
将氧化硅层沉积至所述基板上,在所述基板上具有所述受损介电薄膜,其中沉积所述氧化硅层包含:
自含硅的前驱物形成等离子体,以将含硅的化合物沉积至所述基板上;以及
将所述基板暴露于含氧的等离子体,所述基板具有所述经沉积含硅的化合物。
14.如权利要求13所述的方法,其中所述含硅的前驱物包含八甲基环四硅氧烷(OMCTS)、甲基二乙氧基硅烷(MDEOS)、双(叔丁胺基)硅烷(BTBAS)、三-二甲基胺基硅烷(TriDMAS)、硅烷、乙硅烷、二氯甲硅烷、三氯硅烷、二溴硅烷、四氯化硅、或者四溴化硅。
15.如权利要求13所述的方法,其中将所述基板暴露于所述含氧的等离子体包含:
自含氧的前驱物形成等离子体,所述含氧的前驱物选自由以下组成的群组:O2、N2O、以及上述化合物的组合。
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PCT/US2012/032203 WO2012148641A2 (en) | 2011-04-25 | 2012-04-04 | Uv assisted silylation for recovery and pore sealing of damaged low k films |
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- 2012-04-04 KR KR1020137029732A patent/KR20140010449A/ko not_active Application Discontinuation
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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CN104779197A (zh) * | 2014-01-13 | 2015-07-15 | 台湾积体电路制造股份有限公司 | 半导体器件金属化系统和方法 |
CN104779197B (zh) * | 2014-01-13 | 2018-08-28 | 台湾积体电路制造股份有限公司 | 半导体器件金属化系统和方法 |
US10121698B2 (en) | 2014-01-13 | 2018-11-06 | Taiwan Semiconductor Manufacturing Company | Method of manufacturing a semiconductor device |
CN105990224A (zh) * | 2015-02-04 | 2016-10-05 | 中芯国际集成电路制造(上海)有限公司 | 改善绝缘层与金属扩散阻挡层的交界面性能的方法 |
CN107743651A (zh) * | 2015-06-25 | 2018-02-27 | 应用材料公司 | 针对侧壁孔密封及通孔清洁度的互连整合 |
CN107743651B (zh) * | 2015-06-25 | 2022-02-01 | 应用材料公司 | 针对侧壁孔密封及通孔清洁度的互连整合 |
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US8492170B2 (en) | 2013-07-23 |
JP2014516477A (ja) | 2014-07-10 |
KR20140010449A (ko) | 2014-01-24 |
TW201243948A (en) | 2012-11-01 |
WO2012148641A2 (en) | 2012-11-01 |
WO2012148641A3 (en) | 2012-12-20 |
US20120270339A1 (en) | 2012-10-25 |
TWI456655B (zh) | 2014-10-11 |
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