CN103109357B - 用于紫外线纳米固化腔室的石英喷洒器 - Google Patents
用于紫外线纳米固化腔室的石英喷洒器 Download PDFInfo
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Abstract
本发明的实施例通常提供用于控制处理腔室内的气流分布的装置及方法。在一个实施例中,处理工具包括:紫外线处理腔室,该紫外线处理腔室界定处理区域;基板支撑件;窗口,该窗口设置于UV辐射源与该基板支撑件之间;以及透明喷洒器,该透明喷洒器设置于该窗口与该基板支撑件间的处理区域内且该透明喷洒器具有介于上处理区域与下处理区域间的一或更多透明喷洒器通道。该处理工具还包括气体分配环,该气体分配环具有介于气体分配环内沟槽与该上处理区域间的一或更多气体分配环通道;及气体出口环,该气体出口环设置于该气体分配环的下方,该气体出口环具有介于该气体出口环内的气体出口环内沟槽与该下处理区域间的一或更多气体出口通道。
Description
技术领域
本发明的实施例关于用于用诸如紫外线(UV)光形成且处理基板上的薄膜的处理工具。具体而言,本发明的实施例关于控制处理腔室内的气流分布。
背景技术
具有低介电常数(low-k)的材料,诸如氧化硅(SiOx)、碳化硅(SiCx)及碳掺杂氧化硅(SiOCx),均发现极其广泛地用于半导体器件制造中。使用低介电常数材料当作传导性互连件之间的金属间及/或层间介电质,将减少归因于电容效应导致的信号传播延迟。介电层的介电常数越低,则介电质的电容越低且集成电路(IC)的RC延迟越低。
低介电常数介电材料一般定义为介电常数k低于二氧化硅的介电常数k的那些材料,即k<4。获得低介电常数材料的典型方法包括用含有碳或氟的各种官能基掺杂二氧化硅。尽管氟化硅酸盐玻璃(FSG)通常具有3.5-3.9的k,但碳掺杂方法可进一步将k值降低至大约2.5。当前努力均集中于开发低介电常数介电材料,通常称为超低介电常数(ULK)介电质,其中k值小于2.5,以满足最新技术需要。
用于在半导体基板上形成含硅薄膜的一种方法为经由腔室内的化学气相沉积(CVD)的制程。在含硅薄膜的CVD过程中,通常使用有机硅供应材料。由于碳存在于此种硅供应材料中,含碳薄膜可形成于腔室壁以及基板上。
此外,可通过将气孔整合于低介电常数介电基材内,从而形成多孔介电材料,来获得超低介电常数(ULK)介电材料。制造多孔介电质的方法通常涉及形成“前体薄膜”,该“前体薄膜”含有两种成分:致孔剂(通常为诸如烃的有机材料)及结构形成剂或介电材料(例如,含硅材料)。一旦前体薄膜形成于基板上,则可移除致孔剂成分,从而留下结构完整的多孔介电质基材或氧化物网状物。
用于自前体薄膜移除致孔剂的技术包括(例如)热制程,其中基板经加热至足以破坏且汽化有机致孔剂的温度。用于自前体薄膜移除致孔剂的一个已知热制程包括UV固化制程,以协助CVD氧化硅薄膜的后处理。例如,美国专利第6,566,278号及第6,614,181号描述用于CVD碳掺杂氧化硅薄膜的后处理的UV光的用途,美国专利第6,566,278号及第6,614,181号两者皆转让给应用材料公司(Applied Materials,Inc.)。
在移除致孔剂的UV固化制程中,UV腔室及制程可具有穿过腔室的不均匀气流。该不均匀气流可导致基板在固化制程中的不均匀加热,从而导致横跨基板的温度梯度及不均匀处理。此外,UV处理腔室可变为涂覆有完整致孔剂、致孔剂碎片及其他致孔剂残余物,包括允许UV光到达基板的窗口的涂层。由于不均匀流,窗口亦可在朝向基板的一个边缘处相对于另一边缘被优先涂覆。此外,致孔剂残余物在窗口上的不均匀堆积可导致横跨基板的不均匀固化薄膜。
随着时间的推移,致孔剂残余物通过降低基板可用的有效UV强度且堆积于腔室的较冷组件处,可降低随后UV致孔剂移除制程的有效性。此外,过量残余物堆积于腔室中可成为不适合于半导体处理的基板上微粒缺陷的来源。因此,需要自处理腔室移除牺牲材料的热不稳定有机碎片(由在CVD过程中用于提高多孔性的致孔剂导致)。因此,移除致孔剂残余物必然导致增大清洁时间及相应的降低产量。
因此,存在对提高效率、产量及改进生产环境中处理腔室(诸如,用于UV致孔剂移除制程的UV处理腔室)的清洁制程的需要。因此,在本领域中需要可提高产量、消耗最少能量且适合于腔室自身内表面的原位清洁制程的UV腔室。
发明内容
本发明的实施例通常提供用于控制处理腔室内的气流分布的装置及方法。在一个实施例中,处理工具包含:紫外线处理腔室,该紫外线处理腔室界定处理区域;基板支撑件,该基板支撑件用于支撑该处理区域内的基板;紫外线(UV)辐射源,该紫外线辐射源与该基板支撑件间隔开来且该紫外线辐射源被配置成产生且向设置于该基板支撑件上的基板发送紫外线辐射;窗口,该窗口安置于该UV辐射源与该基板支撑件之间;透明喷洒器,该透明喷洒器安置于该窗口与该基板支撑件间的该处理区域内且该透明喷洒器界定上处理区域及下处理区域。上处理区域设置于窗口与透明喷洒器之间而下处理区域设置于透明喷洒器与基板支撑件之间。该透明喷洒器具有介于该上处理区域与该下处理区域间的一或更多透明喷洒器通道。该处理工具进一步包含:气体分配环,该气体分配环具有介于该气体分配环内的气体分配环内沟槽与该上处理区域间的一或更多气体分配环通道;以及气体出口环,该气体出口环位于该气体分配环的下方,该气体出口环具有介于该气体出口环内的气体出口环内沟槽与该下处理区域间的一或更多气体出口通道。
在另一个实施例中,本发明提供一种控制处理腔室中的流量分配分布的方法,该方法包含:将气体物质注入至该处理腔室的上处理区域中,该上处理区域位于窗口与透明喷洒器之间,该透明喷洒器设置于该处理腔室内;使该气体物质流动穿过一或更多通道且进入下处理区域中,该一或更多通道形成于该透明喷洒器中,该下处理区域位于该喷洒器与基板支撑件之间,该基板支撑件位于该处理腔室内;以及使该气体物质自该下处理区域排出且穿过排气口。
在另一个实施例中,本发明提供一种用于清洁处理腔室的方法,该方法包含:将清洁气体注入至该处理腔室的上处理区域中,该上处理区域位于窗口与透明喷洒器之间,该透明喷洒器设置于该处理腔室内;将该清洁气体与UV光与热中的至少一个反应,以形成反应物质;使该反应物质流动穿过一或更多通道且进入下处理区域中,该一或更多通道形成于该透明喷洒器中,该下处理区域位于该喷洒器与基板支撑件之间,该基板支撑件位于该处理腔室内;移除沉积于该窗口及该透明喷洒器的表面上的残余物;以及使该反应物质及残余物自该下处理区域排出且穿过排气口。
附图说明
因此,已可详细理解本发明的上述特征结构的方式,可参照实施例获得上文简要概述的本发明的更具体描述,其中某些实施例图示于附图中。然而,应注意,附图仅图示本发明的典型实施例,且因此不欲视为本发明范围的限制,因为本发明可允许其他同等有效的实施例。
图1为半导体处理系统的平面视图,本发明的实施例可整合于该半导体处理系统中。
图2为针对UV固化配置的半导体处理系统的串联处理腔室的视图。
图3为具有盖组件的串联处理腔室的局部剖视图,其中两个UV灯泡分别安置于两个处理区域的上方。
图4为无盖组件的一个处理腔室的一部分的等角横截面视图。
图5A为无窗口组件的图4中处理腔室的等角横截面视图。
图5B为图5A中所示喷洒器的横截面的近视图。
图6为图示气流路径的图5A中处理腔室的横截面视图。
图7为如图6中所示处理腔室及气流路径的一部分的等角横截面的近视图。
为了促进理解,在可能的情况下,使用相同元件符号代表诸图所共有的相同元件。预期在一个实施例中所揭示的元件可有利地用于其他实施例中,而无需特别叙述。
具体实施方式
本发明的实施例大体而言提供一种处理工具,该处理工具具有紫外线(UV)处理腔室及该处理腔室内的硬件,该处理工具用于控制处理区域内的气流分布。本发明的实施例使得处理工具能够控制紫外线处理腔室内气体的传递、流径、分配及移除,以较佳地控制各种制程。本发明的实施例亦提供控制处理工具内气流分布的方法及清洁处理工具的方法。
硬件的设计允许横跨基板的特定气流分布分配,该基板正在UV腔室、灯加热腔室或其他腔室中进行处理,在腔室中呈光形式的能量用以直接在该基板上或在该基板上方处理薄膜或催化反应。此外,可通过移除任何残余物累积来有效地清洁处理腔室壁、UV窗口及基板支撑件。此外,本发明的实施例通过在基板处理期间控制基板除气的气流分布来减少初始残余物累积。尽管任何处理腔室或制程可使用本发明的实施例,但含致孔剂薄膜的UV固化将用以描述本发明。
在用于UV固化的处理腔室的一个实施例中,串联处理腔室提供腔室主体中的两个独立且相邻的处理区域及具有一或更多灯泡隔离窗口的盖,这些灯泡隔离窗口在每一个处理区域上方各自对准。可用串联处理腔室的每侧一个窗口(以隔离一或更多灯泡与一个较大共用体积中的基板)来实施这些灯泡隔离窗口,或用密闭于UV透明容器(该UV透明容器与处理区域直接接触)中的灯泡阵列中的每一个灯泡来实施这些灯泡隔离窗口。可由耦接至盖的外壳覆盖每处理区域的一或更多UV灯泡,且该一或更多UV灯泡发射UV光,该UV光穿过窗口导向至位于每一个处理区域内的每一个基板上。
UV灯泡可为发光二极管阵列或使用任何最新技术UV照明源的灯泡,包括(但不限于)微波弧、射频灯丝(电容耦合等离子体)及电感耦合等离子体(inductively coupledplasma;ICP)灯。此外,在固化制程期间,UV光可呈脉冲状。增强基板照明均匀性的各种概念包括灯阵列的使用(这些灯阵列亦可用以改变入射光的波长分配)、基板及灯头的相对运动(包括旋转及周期性平移(扫掠))及灯反射体形状及/或位置的实时修改。UV灯泡为紫外线辐射源,且这些UV灯泡可发送宽广波长光谱范围的UV及红外线(IR)辐射。
在固化制程期间形成的残余物可包含碳,例如碳及硅两者,且使用基于臭氧的清洁移除这些残余物。可利用将臭氧远端输送至固化腔室、原位产生或通过同时执行这两种方案来达成必要臭氧的生产。可使用任何现有臭氧产生技术达成远端产生臭氧的方法,这些技术包括(但不限于)介电阻挡/电晕放电(例如,应用材料公司(Applied Materials)的臭氧发生器)或UV活化反应器。用于固化介电材料的UV灯泡及/或可远端设置的额外UV灯泡(多个)可用以产生臭氧。
图1图示半导体处理系统100的平面视图,该半导体处理系统100可使用本发明的实施例。系统100图示ProducerTM处理系统的一个实施例,该ProducerTM处理系统可购自加利福尼亚州圣塔克拉拉市的应用材料公司(Applied Materials,Inc.)。处理系统100为独立系统,该系统具有必要的处理设施,这些处理设施支撑于主框架结构101上。处理系统100大体包括:前端分级区域102,该前端分级区域中支撑基板盒109并且基板装入装载锁定腔室112中且自装载锁定腔室112卸载;移送腔室111,该移送腔室111容纳基板机械手113;一系列串联处理腔室106,这些串联处理腔室106安装于移送腔室111上;以及后端138,该后端138容纳系统100的操作所需的支撑设施(诸如,气体盘103及配电盘105)。
串联处理腔室106中的每一个串联处理腔室106均包括两个用于处理基板的处理区域(参阅图3)。两个处理区域共享共用气体供应器、共用压力控制及共用制程排气/泵送系统。系统的模块设计允许自任何一个配置快速转换为任何其他配置。可改变腔室的布置及组合,以达成执行特定制程步骤的目的。串联处理腔室106中的任何串联处理腔室106可包括根据本发明的如下所述方面的盖,该盖包括一或更多紫外线(UV)灯,以用于基板上低介电常数材料的固化制程中及/或用于腔室清洁制程中。在一个实施例中,所有三个串联处理腔室106均具有UV灯,且这些串联处理腔室106被配置成并行运行的UV固化腔室,以达成最大产量的目的。
在替代性实施例中,其中并非所有串联处理腔室106均配置为UV固化腔室,系统100可适于具有串联处理腔室中一或更多个,这些串联处理腔室具有支撑腔室硬件,已知该支撑腔室硬件可容纳各种其他已知制程,诸如化学气相沉积(CVD)、物理气相沉积(PVD)、蚀刻等。例如,系统100可被配置成串联处理腔室106其中之一作为用于将诸如低介电常数(K)薄膜的材料沉积于基板上的CVD腔室。此种配置可使研发制造利用率最大化且(若需要)不使原沉积薄膜暴露于大气中。
控制器140耦接至半导体处理系统100的各种部件以便于控制本发明的制程,该控制器140包括中央处理单元(CPU)144、存储器142及支持电路146。存储器142可为半导体处理系统100或CPU 144的近端或远端的任何计算机可读取媒体,诸如随机存取存储器(RAM)、只读存储器(ROM)、软盘、硬盘或任何其他形式的数字存储。支持电路146耦接至CPU 144,用于以常规方式支持CPU。这些电路包括高速缓存、电源、时钟电路、输入/输出电路系统及子系统等。当由CPU 144执行时,储存于存储器142中的软件例程或一系列程序指令使UV固化串联处理腔室106执行本发明的制程。
图2图示针对UV固化配置的半导体处理系统100的一个串联处理腔室106。串联处理腔室106包括主体200及盖202,该盖202可铰接至主体200。腔室主体200可用铝制成。两个外壳204耦接至盖202,这些外壳204各自耦接至入口206及出口208,以使冷却空气通过外壳204的内部。冷却空气可处于室温或大约二十二摄氏度。中心加压空气源210向入口206提供足够流速的空气,以确保正常操作任何UV灯灯泡及/或与串联处理腔室106有关的灯泡功率源214。出口208接收来自外壳204的废气,该废气由共用排气系统212收集,该排气系统212视灯泡选择而定可包括洗涤器以移除由UV灯泡潜在产生的臭氧。可通过用无氧冷却气(例如,氮气、氩气或氦气)冷却灯来避免臭氧管理问题。
图3图示串联处理腔室106的局部剖视图,该串联处理腔室106具有盖202、外壳204及功率源214。外壳204中的每一个外壳204覆盖两个UV灯灯泡302中的各别一个灯泡302,这些灯泡302各自安置于界定于主体200内的两个处理区域300上方。处理区域300中的每一个处理区域300包括加热基板支撑件(诸如,基板支撑件306),以支撑处理区域300内的基板308。基板支撑件306可由陶瓷或诸如铝的金属制成。较佳地,基板支撑件306耦接至主干310,该主干310延伸穿过主体200的底部且由驱动系统312操作,以移动处理区域300中的基板支撑件306朝向UV灯灯泡302及远离UV灯灯泡302。在固化期间驱动系统312亦可旋转及/或平移基板支撑件306,以进一步增强基板照明的均匀性。基板支撑件306的可调节定位允许控制挥发性固化副产品及净化和清洁气流图案及滞留时间,以及基板308上的入射UV照射水平的潜在微调,这视光传递系统设计考虑事项(诸如,焦距)的本质而定。
通常,可使用任何UV源,诸如汞微波弧光灯、脉冲氙闪光灯或高效UV发光二极管阵列。UV灯灯泡302为密封等离子体灯泡,这些灯泡填充有一或更多用于受功率源214激发的气体,诸如氙(Xe)或汞(Hg)。较佳地,功率源214为微波产生器,这些微波产生器可包括一或更多磁控管(未图示)及以给磁控管的灯丝供能的一或更多变压器(未图示)。在一个具有千瓦微波(MW)功率源的实施例中,外壳204中的每一个外壳204包括邻接于功率源214的孔径215以接收来自功率源214的高达约6000W的微波功率,以随后产生来自灯泡302中的每一个灯泡302的高达约100W的UV光。在另一个实施例中,UV灯灯泡302可包括灯泡302中的电极或灯丝,以使功率源214表示电极的电路系统及/或电流供应,诸如直流(DC)或脉冲DC。
对一些实施例而言,功率源214可包括能够激发UV灯灯泡302内的气体的射频(RF)能量源。灯泡中RF激发的配置可为电容性或电感性。电感耦合等离子体(ICP)灯泡可用于通过产生比在电容耦合放电的情况下更密的等离子体来有效提高灯泡辉度。此外,ICP灯消除由电极劣化引起的UV输出的劣化,从而导致增强系统生产率的较长寿命灯泡。功率源214为RF能量源的益处包括提高效率。
较佳地,灯泡302发射横跨170nm至400nm的宽广波长带的光。在本发明的一个实施例中,灯泡302发射波长为185nm至255nm的光。经选定用于灯泡302内的气体可决定发射的波长。发射自UV灯灯泡302的UV光通过窗口314进入处理区域300,这些窗口314安置于盖202中的孔径中。窗口314较佳地由无OH的合成石英玻璃制成且这些窗口314具有足以无裂缝维持真空的厚度。此外,窗口314较佳地为熔融二氧化硅,该熔融二氧化硅透射下至大约150nm的UV光。由于盖202密封至主体200且窗口314密封至盖202,所以处理区域300提供能够将压力维持于大约1托至大约650托的体积。处理气体或清洁气体经由两个入口通道316中的各别一个入口通道316进入处理区域300。随后,处理气体或清洁气体经由共用出口318离开处理区域300。此外,提供至外壳204的内部的冷却空气循环经过灯泡302,但窗口314将该冷却空气与处理区域300隔离。
外壳204可以包括内抛物表面,该内抛物表面由浇铸石英内衬304界定,该石英内衬304涂覆有二向色薄膜。石英内衬304反射发射自UV灯灯泡302的UV光,且这些石英内衬304基于UV光(该UV光由石英内衬304导向至处理区域300中)的图案经成形以适合于固化制程以及腔室清洁制程。石英内衬304可调整以通过移动且改变内抛物表面的形状较佳地适合于每一个制程或任务。此外,石英内衬304归因于二向色薄膜可透射红外线光且反射由灯泡302发射的紫外线光。二向色薄膜通常构成周期性多层薄膜,该周期性多层薄膜由不同的介电材料组成,这些介电材料具有交替的高折射率及低折射率。由于涂层为非金属的,所以来自功率源214的向下入射于浇铸石英内衬304的背侧上的微波辐射并不会与调制层显著相互作用或为调制层所吸收,且该微波辐射易透射以供使灯泡302中的气体离子化。
使基板进入处理区域300,以对沉积于基板308上的介电薄膜执行后处理固化。薄膜可为低介电常数介电薄膜,这些介电薄膜具有致孔剂,包括(例如)薄膜内的硅主链结构及碳。薄膜内的硅主链结构及碳有时称为致孔剂。在UV暴露后,碳键断裂且碳自薄膜除气,留下硅主链且提高多孔性,从而降低介电常数值且减小薄膜的载流容量。
在常规系统中,在基板的固化及除气过程中,交叉流动的不均匀气流分布净化腔室。净化气体自腔室的一侧流向相对侧且介于基板与窗口之间,以使逸出薄膜的任何残余物在该残余物可凝结于窗口上或腔室中的其他任何地方之前被带走。鉴于流量分布的不受控制的不均匀性,基板处理亦将是不均匀的且导致横跨基板的温度梯度。然而,45nm范围中的薄膜的所得的不均匀性可能为可接受的,但该不均匀性在下一代20nm至28nm薄膜中为不可接受的。
本发明的实施例涉及硬件设计,该硬件设计允许横跨基板308的特定气流分布分配,该基板308正在UV腔室、灯加热腔室或其他腔室中进行处理,在腔室中“光”能量用以直接在基板308上或在基板308上方处理薄膜或催化反应。将就图4至图5B描述本发明的各种实施例。图4图示一个处理腔室400的一部分的等角横截面视图,该处理腔室400包括用以在处理期间改进气流分布均匀性及提高基板产量的本发明的实施例。图5A为无窗口组件的图4中处理腔室400的等角横截面视图。图5B为图5A中所示喷洒器的横截面的近视图。
处理腔室400的一部分图示允许控制处理腔室各处气流分布的各种硬件设计。窗口组件设置于处理腔室400内,以固持UV真空窗口412。窗口组件包括真空窗口夹410,该真空窗口夹410放置于主体200的一部分上且支撑真空窗口412,来自UV灯302的UV光可通过真空窗口412,该窗口组件为主体200上方盖组件的一部分。真空窗口412设置于UV辐射源(诸如,UV灯302)与基板支撑件306之间。UV辐射源302与基板支撑件306间隔开来且被配置成产生且向设置于基板支撑件306上的基板308发送紫外线辐射。
透明喷洒器414设置于处理区域300内且介于真空窗口412与基板支撑件(诸如,基板支撑件306)之间。透明喷洒器将上处理区域320界定于真空窗口412与透明喷洒器414之间,且该透明喷洒器进一步将下处理区域322界定于透明喷洒器414与基板支撑件(诸如,基板支撑件306)之间(图5A)。透明喷洒器414亦具有一或更多介于上处理区域320与下处理区域322间的通道416。通道416可能具有粗糙表面418,有时称为“磨砂(frosted)”,以使通道416并非完全透明,否则可能会潜在地在基板308上造成阴影且削弱薄膜的正常固化。因为可能为磨砂的通道416扩散UV光,所以在处理期间在基板308上不存在光图案。
透明喷洒器414形成第二窗口,UV光可通过该第二窗口到达基板308。作为第二窗口,喷洒器414需要对用于固化基板308上的薄膜的所要光波长为透明的。透明喷洒器可由各种透明材料(诸如,石英或蓝宝石)制成。可通过穿过石英件钻孔来形成通道416,以形成透明喷洒器414且使透明喷洒器414成形以装入处理区域300内。石英件的表面可经火焰抛光,而钻孔可经蚀刻以形成粗糙表面418。通道416的大小及密度可能为均匀的或不均匀的,以实现横跨基板表面的所要流动特性。通道416可具有均匀流量分布(其中横跨基板308的每径域的流量为均匀的)或气流可优先到基板308的中心或边缘,即,气流可具有优先的流量分布。
可涂覆透明喷洒器414及真空窗口412,以具有带通滤光片且改进所要波长的透射。例如,抗反射涂层(ARC)可沉积于透明喷洒器414及真空窗口412上,以改进所要波长的透射效率。用以反射IR且允许UV通过的反射涂层或用以反射UV且允许IR通过的二向色涂层皆亦可应用于透明喷洒器414表面及真空窗口412表面。可由PVD、CVD或其他合适的沉积技术形成涂层。涂层可包含具有所要薄膜透射率及折射率的无机薄膜层,该无机薄膜层可协助光穿过透明喷洒器414及真空窗口412透射至基板308。在一个实施例中,这些涂层可含有氧化钛(TiO2)层、氧化锡(SnO2)层、二氧化硅(SiO2)或这些材料的组合,这些涂层形成于真空窗口412及透明喷洒器414的表面上。
在另一个实施例中,ARC涂层可为具有形成于真空窗口412及透明喷洒器414的表面上的一层或更多层的组合层。在一个实施例中,ARC涂层可为包括形成于第二层上的第一层的薄膜堆迭,该ARC涂层形成于真空窗口412及透明喷洒器414的表面上。在一个实施例中,第一层可为氧化硅(SiO2)层而第二层可为氧化钛(TiO2)层或氧化锡(SnO2)层,或者反之亦然。在另一个实施例中,ARC层可包括含有重复氧化硅(SiO2)层及氧化钛(TiO2)层的薄膜堆迭。
气体分配环420安置于处理区域300内,该气体分配环420具有一或更多气体分配环通道426。一或更多气体分配环通道426耦接气体分配环内沟槽424与上处理区域320,从而在内沟槽424与透明喷洒器414上方的上处理区域320之间形成气流路径。气体出口环430设置于气体分配环420下方,且该气体出口环430可至少部分地位于处理区域300内的透明喷洒器414下方。气体出口环430亦具有一或更多气体出口通道436,该一或更多气体出口通道436耦接气体出口环内沟槽434及下处理区域322,从而在下处理区域322与气体出口内沟槽434之间形成气流路径。气体出口环430的一或更多气体出口通道436至少部分地安置于透明喷洒器414下方。
图6图示图5A中处理腔室的示意横截面视图,从而图示气流路径。净化气体或其他类型的气体可注入至真空窗口412与透明喷洒器414间的上处理区域320中,穿过透明喷洒器414且自透明喷洒器414向下朝向基板。通道416、426、436的大小及气体流速可经调整,使得背压形成以使向下朝向基板308的流动均匀。气流自上方冲刷基板、同心展开且离开下处理区域322,穿过气体出口通道436且流向泵610。
箭头605图示气流路径自气体分配环420、穿过透明喷洒器414、在基板支撑件306上方、穿过气体出口环430且离开腔室400,该基板支撑件306上亦可具有基板308。通道416、426、436的密度及大小可经调整,以视需要增大或减小气流速率。在一个实施例中,通道416、426、436的密度及大小提供横跨基板308的均匀的气流分布。诸如气体分配环420的硬件提供充足压力降,以在进入透明喷洒器414上方的上处理区域320之前均匀分配气体。随后,气体由于穿过喷洒器414的通道416的高流动阻力可均匀地填充透明喷洒器414上方的上处理区域320。气流行进至基板,且该气流随后均匀地穿过气体出口环430经泵出至泵610。
视喷洒器414中的通道416图案而定,流动可为均匀的(与基板面积成比例)或优先朝向中心或边缘流动。因此,可横跨基板308控制气流分布,以提供所要均匀的或不均匀的分配。此外,亦可将横跨基板308的温度分布控制为均匀的或不均匀的。因此,本发明的实施例不仅提供产生横跨基板的均匀气流及温度分布的能力,亦提供产生及控制所要不均匀的气体及温度分布的能力。
在本发明的一些实施例中,气体组合物可包括用于净化腔室的净化气体。这些气体可包括惰性气体物质或不反应气体,诸如氩气(Ar)、氦气(He)、氮气(N2)等。在另一个实施例中,气体组合物可包括用于清洁处理腔室及腔室内的部件的清洁气体。清洁气体可包括臭氧、Ar、He或这些气体的组合。本发明的实施例在清洁气体为臭氧时尤其有助于改进清洁制程。臭氧可在处理区域的远端产生,或将臭氧引入至腔室中可包括用紫外线光活化氧以产生臭氧。气体供应器600可将臭氧产生源耦接至处理区域300。当使用臭氧时,较小体积的腔室可改进清洁效率。提供至处理区域的UV光及热可将臭氧分解为氧自由基,以供与沉积残余物进行反应,以移除这些残余物。
当UV灯302开启时,归因于来自灯的红外线光,加热真空窗口412及透明喷洒器414两者。透明喷洒器414可能对UV光透光而吸收IR光中的一些IR光,因此在两个窗口之间形成加热沟槽,以供臭氧在上处理区域320中分解,且该臭氧随后向下移动至下处理区域322中以供清洁。透明喷洒器414所吸收的IR光产生温度梯度,该温度梯度与自气体分配环420注入至上处理区域320中的臭氧相互作用,从而使臭氧分解。正在分解的臭氧量可能与环绕上处理区域320的部件(诸如,喷洒器414及气体分配环420)的温度及表面积成比例。通过增大加热部件的表面积,将臭氧分解成为反应氧自由基所需的能量可能较少,且可改进清洁效率。此外,可将臭氧均匀地传递至基板308,在基板308处UV光将使臭氧分解成O2及氧自由基,该O2及氧自由基可用于蚀刻基板308上的有机薄膜或材料。
如图6中所示,另一个加热器630可用以加热处理腔室中的部件,诸如真空窗口夹410、真空窗口412及气体分配环420。加热这些硬件部件可改进臭氧退化效率且减少致孔剂在部件上的沉积。气体分配环420、气体出口环430及真空窗口夹410可由阳极化铝制成,以增大那些部件的放射率。部件随后可吸收更多热量,从而升高部件温度且减少部件上的残余物沉积量,以产生减少的清洁时间、改进产量及粒子性能。此外,可向排气口317提供热量,以亦减少或防止致孔剂聚集于排气口317中。
气体供应器600与气体分配环420耦接,以提供用于可在腔室400中执行的沉积制程、形成制程、处理制程、净化制程及清洁制程的各种气体。在另一个实施例中,远端等离子体源(RPS)亦可与气体分配环420耦接,以在需要时将等离子体供能物质提供至处理区域中。气体泵610与气体出口环430耦接,以自腔室移除气体化合物。此外,加热器620与基板支撑件306耦接,以加热基板及周围区域,包括下处理区域322中的气体。
图7为如图6所示处理腔室及气流路径的一部分的等角横截面的近视图。气体分配环420及气体出口环430可包含各种部件。气体分配环420可包含基座分配环421及气体入口环423。基座分配环421可界定一或更多气体分配环通道426。气体入口环423可与基座分配环421耦接,该气体入口环423及该基座分配环421可一起界定气体分配环内沟槽424。气体入口环423亦可具有一或更多气体入口425,气体可穿过该或该一或更多气体入口425进入气体分配环内沟槽424。气体供应源600耦接至气体入口425,以向气体分配环420提供气体物质及混合物。
气体出口环430可包含基座出口环431及气体泵送环433。气体泵送环433可界定该一或更多气体出口通道436且支撑透明喷洒器414。基座出口环431与气体泵送环433耦接,以形成气体出口环430。基座出口环431及气体泵送环433可一起界定气体出口环内沟槽434。气体出口环430的至少一个气体出口438(参阅图6)可与排气口317对准,以供气体离开气体出口环430。
如图7中所示且如箭头605所图示,气体可进入气体入口425,并且该气体流动穿过气体分配环内沟槽424且流出气体出口环430的通道426。气体填充透明喷洒器414上方的体积(例如,上处理区域320)且该气体流动穿过喷洒器通道416。随后,气体横跨基板308同心且径向流动至气体出口通道436。随后,气体自下处理区域322排出、进入气体出口环内沟槽434、流动穿过内沟槽434且离开气体出口438进入排气口317且至泵610。
由本发明的实施例提供的同心气流分布亦可允许调整压力、气体组合物、气体混合物等,以改变基板308上的温度分布,诸如在若期望基板边缘冷制程或边缘热制程的情况下。常规设计不允许调整这些变量,以产生且控制横跨基板表面的温度分布。例如,在本发明的一些实施例中,压力变化及更多氩气或更多氦气可用以调整温度分布。氦气运载热量更有效率,且压力将改变气体滞留时间。为穿过透明喷洒器的流量分配调整这些制程变量以及通道大小可促使将横跨基板的温度分布控制为在基板308上的所要位置处为均匀的或不均匀的,藉此较佳地处理基板308及基板308上的薄膜。在一些实施例中,气体可注射于处理腔室400内的不同区域处。
UV固化可具有各种用途,诸如用于薄膜修复及使薄膜中的氢键断裂以增大薄膜应变能。处理腔室400亦可用于将UV活化气体物质注入至处理区域300中,以在基板308上形成薄膜。特定气体可在基板308上方混合,在基板处可通过使用UV光且允许“滴落(drop-on)”沉积制程,在气相中使反应活化。在另一个实施例中,气体可与用作催化剂的UV光反应,以在基板308上形成薄膜。因此,气体供应器600亦可包括前体及不反应气体,可用UV光引发这些前体及不反应气体以形成薄膜。在一些实施例中,窗口412及喷洒器414可能需要冷却或至少不被加热,以防止在窗口412及喷洒器414上沉积薄膜。然而,可实施臭氧清洁制程,以自窗口412及喷洒器414移除任何这种薄膜沉积物。此外,可均匀地引入气体以在基板上产生单层或多层薄膜。UV能量随后可用以使基板308上的反应活化,以进一步视需要形成沉积层。
本发明的实施例改进基板的温度均匀性达2倍至3倍,且更有效地清洁真空窗口。因为该系统允许清洁制程及固化制程两者的更高效率,因此该系统的产量增大。在一些情况下,改进的固化时间差不多减少了10%至15%,被认为是基板308的更均匀温度的结果,从而在腔室内或在基板308上不具有冷点且保持窗口更清洁以降低由沉积残余物堆积所引起的横跨窗口表面的不同光强度。此外,由于更有效地使用气体,因此可减少流动穿过处理腔室所需的气体量。
尽管上文针对本发明的实施例,但在不脱离本发明的基本范围的情况下可设计本发明的其他及另外实施例。
Claims (15)
1.一种用于控制处理腔室内的气流分布的处理工具,所述处理工具包含:
紫外线处理腔室,所述紫外线处理腔室界定处理区域;
基板支撑件,所述基板支撑件用于支撑所述处理区域内的基板;
紫外线(UV)辐射源,所述紫外线辐射源与所述基板支撑件间隔开来且所述紫外线辐射源被配置成产生且向设置于所述基板支撑件上的基板发送紫外线辐射;
窗口,所述窗口安置于所述UV辐射源与所述基板支撑件之间;
其特征在于,所述处理工具进一步包含:
透明喷洒器,所述透明喷洒器安置于所述窗口与所述基板支撑件间的所述处理区域内且所述透明喷洒器界定上处理区域及下处理区域,所述上处理区域位于所述窗口与所述透明喷洒器之间,而所述下处理区域位于所述透明喷洒器与所述基板支撑件之间,所述透明喷洒器具有介于所述上处理区域与所述下处理区域间的一或更多透明喷洒器通道;
气体分配环,所述气体分配环具有介于所述气体分配环内的气体分配环内沟槽与所述上处理区域间的一或更多气体分配环通道;以及
气体出口环,所述气体出口环设置于所述气体分配环的下方,所述气体出口环具有介于所述气体出口环内的气体出口环内沟槽与所述下处理区域间的一或更多气体出口通道。
2.如权利要求1所述的处理工具,其中所述一或更多气体出口通道至少部分地安置于所述透明喷洒器的下方。
3.如权利要求1所述的处理工具,其中所述气体分配环进一步包含:
基座分配环,所述基座分配环界定所述一或更多气体分配环通道;以及
气体入口环,所述气体入口环与所述基座分配环耦接,所述气体入口环及所述基座分配环一起界定所述气体分配环内沟槽,所述气体入口环进一步包含一或更多气体入口,以供气体进入所述气体分配环内沟槽。
4.如权利要求1所述的处理工具,其中所述气体出口环进一步包含:
气体泵送环,所述气体泵送环界定所述一或更多气体出口通道;以及
基座出口环,所述基座出口环与所述气体泵送环耦接,所述基座出口环及所述气体泵送环一起界定所述气体出口环内沟槽,所述基座出口环进一步包含至少一个气体出口,以供气体离开所述气体出口环。
5.如权利要求1所述的处理工具,其中所述一或更多透明喷洒器通道具有均匀的气流分布,其中横跨所述基板的每径域的所述气流为均匀的。
6.如权利要求1所述的处理工具,其中所述一或更多透明喷洒器通道具有优先的气流分布,其中每径域的所述气流优先到所述基板的中心或边缘。
7.一种控制处理腔室中的流量分配分布的方法,所述方法包含:
将气体物质注入至所述处理腔室的上处理区域中,所述上处理区域位于窗口与透明喷洒器之间,所述透明喷洒器设置于所述处理腔室内;
使所述气体物质流动穿过一或更多通道且进入下处理区域中,所述一或更多通道形成于所述透明喷洒器中,所述下处理区域位于所述透明喷洒器与基板支撑件之间,所述基板支撑件位于所述处理腔室内;以及
使所述气体物质自所述下处理区域排出且穿过排气口。
8.如权利要求7所述的方法,其中注入气体物质进一步包含:
使所述气体物质流动穿过气体分配环至所述上处理区域。
9.如权利要求8所述的方法,其中使所述气体物质流动穿过所述气体分配环包含:
使所述气体物质流动穿过气体分配环内沟槽及一或更多气体分配环通道,所述气体分配环内沟槽安置于所述气体分配环内,所述一或更多气体分配环通道安置于所述气体分配环内且介于所述气体分配环内沟槽与所述上处理区域之间。
10.如权利要求7所述的方法,其中使所述气体物质排出进一步包含:
使所述气体物质流动穿过气体出口环且流向排气口,所述气体出口环安置于所述气体分配环下方。
11.如权利要求10所述的方法,其中使所述气体物质流动穿过气体出口环进一步包含:
使所述气体物质流动穿过一或更多气体出口通道且穿过气体出口环内沟槽至所述排气口,所述一或更多气体出口通道安置于所述气体出口环内且介于所述下处理区域与所述气体出口环内沟槽之间,所述气体出口环内沟槽安置于所述气体出口环内。
12.一种用于清洁处理腔室的方法,所述方法包含:
将清洁气体注入至所述处理腔室的上处理区域中,所述上处理区域位于窗口与透明喷洒器之间,所述透明喷洒器设置于所述处理腔室内;
将所述清洁气体与UV光或热中的至少一个反应,以形成反应物质;
使所述反应物质流动穿过一或更多通道且进入下处理区域中,所述一或更多通道形成于所述透明喷洒器中,所述下处理区域位于所述透明喷洒器与基板支撑件之间,所述基板支撑件位于所述处理腔室内;
移除沉积于所述窗口及所述透明喷洒器的表面上的残余物;以及
使所述反应物质及残余物自所述下处理区域排出且穿过排气口。
13.如权利要求12所述的方法,其中注入进一步包含:
使所述清洁气体流动穿过气体分配环至所述上处理区域;以及
其中排出进一步包含:
使所述反应物质流动穿过气体出口环且流向排气口,所述气体出口环安置于所述气体分配环下方。
14.如权利要求13所述的方法,其中使所述清洁气体流动穿过气体分配环至所述上处理区域进一步包含:
使所述清洁气体流动穿过气体分配环内沟槽及一或更多气体分配环通道,所述气体分配环内沟槽安置于所述气体分配环内,所述一或更多气体分配环通道安置于所述气体分配环内且介于所述气体分配环内沟槽与所述上处理区域之间。
15.如权利要求13所述的方法,其中使所述反应物质流动穿过安置于所述气体分配环下方的气体出口环且流向排气口进一步包含:
使所述反应物质流动穿过一或更多气体出口通道且穿过气体出口环内沟槽至所述排气口,所述一或更多气体出口通道安置于所述气体出口环内且介于所述下处理区域与所述气体出口环内沟槽之间,所述气体出口环内沟槽安置于所述气体出口环内。
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WO2012054206A3 (en) | 2012-06-21 |
US20120090691A1 (en) | 2012-04-19 |
KR101896607B1 (ko) | 2018-09-07 |
CN103109357A (zh) | 2013-05-15 |
US8911553B2 (en) | 2014-12-16 |
TW201221684A (en) | 2012-06-01 |
JP2013541849A (ja) | 2013-11-14 |
WO2012054206A2 (en) | 2012-04-26 |
JP5905476B2 (ja) | 2016-04-20 |
KR20130129943A (ko) | 2013-11-29 |
TWI537417B (zh) | 2016-06-11 |
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