CN1643178A - 用于半导体工艺设备中的低污染部件及其制造方法 - Google Patents
用于半导体工艺设备中的低污染部件及其制造方法 Download PDFInfo
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- CN1643178A CN1643178A CNA038065916A CN03806591A CN1643178A CN 1643178 A CN1643178 A CN 1643178A CN A038065916 A CNA038065916 A CN A038065916A CN 03806591 A CN03806591 A CN 03806591A CN 1643178 A CN1643178 A CN 1643178A
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Abstract
至少局部由抗侵蚀,抗腐蚀和/或者抗侵腐蚀的陶瓷材料制成的半导体工艺设备的部件。示例的陶瓷材料可以包括铪,锶,镧和/或镝的至少一种氧化物,氮化物,硼化物,碳化物和/或者氟化物。这些陶瓷材料可以涂在衬底上作涂层,制成复合部件,或者制成单独个体。这些涂层可以保护衬底免受物理或化学的冲击。这些陶瓷材料可以用来制备暴露在等离子体中的半导体工艺设备的部件,以延长使用寿命。
Description
发明背景
1.发明领域
本发明涉及半导体材料工艺设备的部件。这些部件由可以在半导体材料工艺中减少污染的材料制成。本发明还涉及这些部件的制造方法。
2.相关技术描述
在半导体材料工艺领域中,使用真空工艺腔来在衬底上进行材料的刻蚀和化学气相淀积(CVD),将工艺气体供入工艺腔中,并同时对这些工艺气体施加一个射频(RF)场将其激发成等离子体。等离子体在晶片上对选好的材料进行所希望的刻蚀或淀积。在专利号为4340462,4948458,5200232和5820723的共同所有的US专利中公开了平行板式变压耦合等离子体(TCPTM),也叫做电感耦合等离子体(ICP),和电子回旋共振(ECR)反应器及其部件的例子。
在半导体衬底的处理过程中,一般用衬底夹具将衬底固定在真空腔中,例如像专利号为5262029和5838529的US专利中所公开的那样。可以通过各种气体供应方式将工艺气体供入腔室中。
除了等离子体腔室设备外,在半导体衬底加工中使用的其它设备包括传送机构,衬里,起落机构,加载锁,室门机构,机械臂,紧固件及其它类似的设备。
等离子体用来通过刻蚀去除材料,或者在衬底上淀积材料。等离子体刻蚀条件对暴露在等离子体中的工艺腔的表面产生强烈的离子轰击。这种离子轰击,结合等离子体的化学物质以及/或者刻蚀产物,会对暴露在等离子体中的工艺腔的表面产生强烈的侵蚀,腐蚀以及侵腐蚀。结果,表面的材料被物理的和/或化学的攻击,包括侵蚀,腐蚀以及/或者侵腐蚀去除。这些攻击引起的问题包括部件寿命变短,消耗成本变大,微粒污染,晶片上过渡金属污染和工艺漂移。
考虑到这些问题,等离子体工艺腔已经被设计成包括部件,例如:圆盘,圆环和圆筒,其将等离子体限定在要加工的晶片之上。然而,这些部件受到等离子体的连续攻击,结果,最终被侵蚀或者聚集了聚合物堆积。最终,这些部件遭受磨损,以致于不能再使用。那些相对短寿命的部件通常叫做“耗材”。如果耗材部件的寿命短,那么所有权的成本就高。这些耗材和其它部件的侵蚀在等离子体工艺腔中产生污染。
由于在这些反应器中,等离子体环境的侵蚀和腐蚀的本性,需要使颗粒以及/或者金属的污染最小化,希望这些设备的部件,包括耗材和其它部件,具有适用的高抗侵腐蚀性。已知已有用铝基材料制成的部件。然而,在等离子体中产生的高离子轰击会对这些材料产生侵蚀和腐蚀,造成难以令人满意的污染(例如微粒污染和金属杂质污染)。
考虑到处理半导体材料对高纯度的需要,需要有由可以提供好的抗物理和化学攻击性的材料组成的半导体工艺设备的部件,以使在半导体材料的加工过程中相关的污染最小化,这些攻击包括侵蚀,腐蚀和/或侵腐蚀。可以提高设备部件的使用寿命并因而减小设备的停机时间的材料,将有助于降低处理半导体材料的成本。
发明简述
本发明通过提供由能够针对等离子体工艺环境中的侵蚀,腐蚀和/或者侵腐蚀提供好的抗磨损性的陶瓷材料组成的半导体工艺设备的部件,能够满足上述需要,还有其它需要。这些部件可以提供低的金属和微粒污染。
本发明的一个示例实施方案,在半导体材料加工设备中用到的部件中,陶瓷材料可以在基底的表面上用作涂层。例如,所述部件可用在等离子体工艺腔中。当在工艺过程中暴露在等离子体中时,涂层部件可以对侵蚀,腐蚀和/或侵腐蚀提供好的抵抗性。
本发明的另一个示例实施方案,这些部件可以是完全由保护材料制成的体部件。即,这些部件是整体式的。
依据本发明来制造半导体工艺设备部件的方法的一个示例实施方案包括至少该设备的一个部件的一部分由陶瓷材料制成。这部分包括该部件的一个最外表面。这些陶瓷材料包括(i)锶,镧和镝的(ii)至少一种氧化物,氮化物,硼化物,碳化物和/或氟化物,以及/或者铪的至少一种氮化物,硼化物,碳化物和/或氟化物。优选的,该陶瓷材料包括氧化锶,氧化镝和氧化镧中的一种作陶瓷材料涂层的单一最大成分。这种陶瓷材料可以用作涂层,或者制成一个单独的个体。
本发明的另一个示例实施方案包括在半导体工艺设备的含金属或者聚合物的表面上涂覆一层陶瓷材料的涂层。该陶瓷材料包括氧化铪,氮化铪,硼化铪,碳化铪或者氟化铪作陶瓷材料涂层的单一最大成分。
依据本发明的方法的其它示例实施方案包括以单独个体的形式制造半导体工艺设备的部件。该部件包括氧化铪,氮化铪,硼化铪,碳化铪或者氟化铪作为单一最大成分。
依据本发明来制造半导体工艺设备部件的方法的一个示例实施方案包括准备一种浆料,其中包括(i)锶,镧和镝的(ii)至少一种氧化物,氮化物,硼化物,碳化物和/或氟化物,以及/或者铪的至少一种氮化物,硼化物,碳化物和/或氟化物作单一最大成分;用这种浆料制成所希望形状的生坯;将此生坯烧结成部件。这种陶瓷材料优选的包括氧化铪,氧化锶,氧化镝和氧化镧中的至少一种作单一最大成分。这些工艺可以用来制造单独一体的部件。
依据本发明的半导体工艺设备部件的一个示例实施方案包括至少有一部分包括一种陶瓷材料。该部分包括此部件的一个最外表面。这种陶瓷材料包括(i)锶,镧和镝的(ii)至少一种氧化物,氮化物,硼化物,碳化物和/或氟化物以及/或者铪的至少一种氮化物,硼化物,碳化物和/或氟化物作单一最大成分。
依据本发明的半导体工艺设备部件的另一个示例实施方案包括一个具有一个含金属或者聚合物的表面的基底;并在该表面上有一个陶瓷材料的涂层,其中,该陶瓷材料包括氧化铪,氮化铪,硼化铪,碳化铪或者氟化铪作这种陶瓷材料涂层的单一最大成分。
依据本发明的半导体工艺设备部件的另一个示例实施方案包括一个单独体,其包括氧化铪,氮化铪,硼化铪,碳化铪或者氟化铪作单一最大成分。
本发明还提供其中包括至少一种上述部件来提供抗磨损性的半导体工艺设备。
附图简述
下面,结合附图对本发明进行的详细描述,将使本发明容易理解:
图1所示是一种传统的等离子体喷涂工艺;
图2所示是依据本发明的一个示例实施方案的等离子体刻蚀设备的导气环(gas ring)的剖面图;
图3是一个包含依据本发明的实施例部件的刻蚀腔;
图4是另一个包含依据本发明的实施例部件的刻蚀腔;
图5是依据本发明的保护性陶瓷涂层的一个实施例;
图6是依据本发明的保护性陶瓷涂层的另一个实施例;
图7是依据本发明的单独体部件的一个实施例。
优选实施方案详述
本发明提供针对半导体材料加工设备中所生成的等离子体引起的物理和化学攻击,具有抗磨损性能的部件。如这里所用到的,“抗磨损”一词包括,但不限于,抗侵蚀,腐蚀和/或侵腐蚀。这些部件由抗磨损的陶瓷材料组成。
在一些示例实施方案中,这些部件包括在基底上制成的抗侵蚀的陶瓷材料涂层。例如,这些部件包括基底以及在这些基底上制成的一种或者多种抗侵蚀的陶瓷涂层。这些涂层抗侵蚀,由于是非金属材料,也抗腐蚀和/或侵腐蚀。
在本发明的其它示例实施方案,这些部件可以基本上完全由抗磨损的陶瓷材料制成。例如这些部件可以是半导体材料加工设备的体部件。
依据本发明,由抗磨损的陶瓷材料组成的部件可以是加工半导体的设备的部件。
本发明还提供包括一种或者多种至少局部由抗磨损的材料组成的部件的半导体工艺设备。
另外,本发明提供制造至少部分由抗磨损材料制成的部件的方法。
如上所述,本发明可用于任何适用类型的部件。本发明对半导体材料加工设备的部件表面提供有效的抗磨损性。本领域技术人员将明白,依据本发明的抗磨损材料可以用到用于处理不同半导体材料的各种工艺设备上。另外,这些抗磨损的材料可以用到工艺设备的不同部件上。这样的示例部件包括,但不限于,等离子体腔和/或者真空腔的部件,例如腔壁,衬底支撑,气体分布系统包括喷头,折流板,套环,喷嘴等,紧固件,加热元件,等离子体屏,衬里,传输模块部件,例如:机械臂,紧固件,内外腔壁等,以及其它相似的部件。
依据本发明,抗磨损的材料可以包括铪,锶,镝和镧中的至少一种。这些元素具有相对较大的分子量,并且相对于典型的刻蚀化学剂是相对惰性的,这被认为可以在等离子体环境中使侵蚀降低。优选的,抗磨损的材料包括氧化铪,氧化锶,氧化镝或者氧化镧中的一种作该陶瓷材料的单一最大组分。这种陶瓷材料的示例实施方案可以包括这些氧化物中的任何一种或者多种。在这些陶瓷材料中可以包括的其它组分在下面进行详细的描述。
依据本发明含有铪的陶瓷材料优选的包含氧化铪(hafnia)作单一最大组分。在一些实施方案中,含铪的陶瓷材料可以基本全由氧化铪构成。含铪的陶瓷材料还可以包括其它的除了氧化物之外的含铪陶瓷材料,包括,但不限于,至少一种硼化铪,氟化铪,氮化铪和/或碳化铪,或者它们的混和物。
依据本发明,含铪的陶瓷材料可以包含,或者除了上述铪的氧化物,硼化物,氟化物和碳化物材料外,还可以包含其它的陶瓷材料。这些其它的陶瓷材料可以包括,但不限于,选自元素周期表中的IIA,IIIA,IVA,VA,VIA,VIIA,VIIIA,IB,IIB,IIIB,IVB和VB族中的元素的至少一种氧化物,氮化物,硼化物,氟化物和/或碳化物;以及/或者任何锕系元素(即原子序数为58-71的元素)的一种或者多种氧化物,氮化物,硼化物,氟化物或者碳化物。例如,含铪的陶瓷材料(以及下面要描述的含锶,含镝以及含镧的材料)可以与氧化钇(yttria),氧化锆(zirconia),氧化铝(alumina)和/或氧化铈(ceria)混和。
依据本发明,含锶的陶瓷材料优选的包含氧化锶(strontia)作单一最大组分。在一些实施方案中,含锶的陶瓷材料可以基本全由氧化锶构成。这种含锶的陶瓷材料还可以包括其它的除了氧化物之外的含锶陶瓷材料,包括,但不限于,至少一种硼化锶,氟化锶,氮化锶,碳化锶,或者它们的混和物。
依据本发明,含锶的陶瓷材料可以包含上述锶的氧化物,硼化物,氟化物和碳化物材料以外的其它陶瓷材料,或者除了上述锶的氧化物,硼化物,氟化物和碳化物材料外,还可以包含其它的陶瓷材料。这些其它的陶瓷材料可以包括,但不限于,选自元素周期表中的IIA,IIIA,IVA,VA,VIA,VIIA,VIIIA,IB,IIB,IIIB,IVB和VB族中的元素的一种或多种氧化物,氮化物,硼化物,氟化物和碳化物;以及/或者任何如上所述的锕系元素的一种或者多种氧化物,氮化物,硼化物,氟化物或者碳化物。
依据本发明,含镝的陶瓷材料优选的包含氧化镝(dysprosia)作单一最大组分。在一些实施方案中,含镝的陶瓷材料可以基本全由氧化镝构成。这种含镝的陶瓷材料还可以包括其它的除了氧化物之外的含镝陶瓷材料,包括,但不限于,至少一种硼化镝,氟化镝,氮化镝,碳化镝,或者它们的混和物。
依据本发明,含镝的陶瓷材料可以包含上述镝的氧化物,硼化物,氟化物和碳化物材料以外的其它陶瓷材料,或者除了上述镝的氧化物,硼化物,氟化物和碳化物材料外,还可以包含其它的陶瓷材料。这些其它的陶瓷材料可以包括,但不限于,选自元素周期表中的IIA,IIIA,IVA,VA,VIA,VIIA,VIIIA,IB,IIB,IIIB,IVB和VB族中的元素的至少一种氧化物,氮化物,硼化物,氟化物和/或碳化物;以及/或者任何如上所述的锕系元素的一种或者多种氧化物,氮化物,硼化物,氟化物或者碳化物。
依据本发明,含镧的陶瓷材料优选的包含氧化镧(lanthana)作单一最大组分。在一些实施方案中,含镧的陶瓷材料可以基本全由氧化镧构成。这种含镧的陶瓷材料还可以包括其它的除了氧化物之外的含镧陶瓷材料,包括,但不限于,至少一种硼化镧,氟化镧,氮化镧和/或碳化镧,或者它们的混和物。
依据本发明,含镧的陶瓷材料可以包含上述镧的氧化物,硼化物,氟化物和碳化物材料以外的其它陶瓷材料,或者除了上述镧的氧化物,硼化物,氟化物和碳化物材料外,还可以包含其它的陶瓷材料。这些其它的陶瓷材料可以包括,但不限于,选自元素周期表中的IIA,IIIA,IVA,VA,VIA,VIIA,VIIIA,IB,IIB,IIIB,IVB和VB族中的元素的至少一种氧化物,氮化物,硼化物,氟化物和/或碳化物;以及/或者任何如上所述的锕系元素的一种或者多种氧化物,氮化物,硼化物,氟化物以及/或者碳化物。
依据本发明,这些陶瓷材料可以包括上述含铪,锶,镝和镧的材料的混和物。另外,这些陶瓷材料可以包括含铪,锶,镝和/或者镧的材料,以及其它的材料(所述其它的材料包括,但不限于,选自元素周期表中的IIA,IIIA,IVA,VA,VIA,VIIA,VIIIA,IB,IIB,IIIB,IVB和VB族中的元素的至少一种氧化物,氮化物,硼化物,氟化物和碳化物;以及/或者任何如上所述的锕系元素的一种或者多种氧化物,氮化物,硼化物,氟化物或者碳化物)的各种混和物。
为了使对在包括一个或者多个依据本发明的含铪,锶,镝和/或镧的部件的设备中处理的电子材料的污染最小化,希望这些陶瓷材料尽可能的纯,例如,包括最小量的有可能引起污染的元素,比如过渡金属,碱金属或者其它类似的元素。例如,这些含铪,锶,镝和镧的陶瓷材料可以足够纯到使晶片上避免1010atoms/cm2或者更高的污染,优选的为105atoms/cm2或者更高。优选的,这些陶瓷材料的纯度至少为大约99%,更优选的,从大约99.99%到大约100%。
另外,这些依据本发明的含铪,锶,镝和镧的陶瓷材料具有光滑的表面。优选的,用作涂层或者制成单独体的这些材料具有的表面粗糙度(RA)从大约5μinch到大约400μinch,更优选的小于大约200μinch。
这些依据本发明的含铪,锶、镝和镧的陶瓷材料还提供与下面基底的高结合强度。优选地,这些材料在涂层形式时具有约2000至7000psi的抗拉结合强度。
并且,这些依据本发明的含铪,锶,镝和镧的陶瓷材料可以提供低的气孔率,这有利于使侵蚀性的气氛与下面的基底的接触最小化(例如含HCl的气氛),并由此使侵蚀性气氛随后对基底的腐蚀,侵蚀和/或侵腐蚀最小化。优选的,这些陶瓷材料的气孔率按体积小于15%,更优选的按体积小于大约3%。
另外,这些依据本发明的含铪,锶,镝和镧的陶瓷材料可以提供抗侵蚀的高硬度。优选的,这些陶瓷材料的硬度(HVO3)从大约200到大约800。
上述陶瓷材料可以提供所希望的抗磨损性能,以用在半导体工艺设备中,例如,像等离子体刻蚀腔。特别的,含铪,锶,镝和镧的陶瓷材料可以提供能够在等离子体反应器腔室中降低离子诱导侵蚀和相关微粒污染的表面。含铪,锶,镝和镧的陶瓷材料还可以保护下面的基底免受等离子体的物理和化学攻击。
依据本发明的抗磨损的陶瓷材料可以用在各种用于刻蚀和淀积应用以及其它应用中的不同等离子体气氛中。例如,典型的刻蚀化学物质包括,例如,含氯的气体,包括。但不限于,Cl2,HCl和BCl3;含溴的气体,包括,但不限于,溴和HBr;含氧的气体,包括,但不限于,O2,H2O和SO2;含氟的气体,包括,但不限于,CF4,CH2F2,NF3,CH3F,CHF3和SF6;以及惰性气体和其它气体,包括,但不限于,He,Ar和N2。根据所要用到的等离子体,这些以及其它气体可以以任何适用的方式结合使用。示例的等离子体反应器的刻蚀操作条件如下:温度从大约25℃到大约90℃;压力从大约0mTorr到大约100mTorr;气体流速从大约10sccm到大约1000sccm;等离子体功率从大约0Watts到大约1500Watts。
在本发明的一个优选的示例实施方案中,含铪,锶,镝和镧的陶瓷材料以衬底上的涂层形式提供。这些涂层可以通过本领域所知道的方法涂覆。一种优选的涂层方法使热喷涂(例如等离子体喷涂)。在这种方法中,将陶瓷粉体熔融,并与一种气流一起通到要喷涂涂层的部件上。热喷涂技术的一个优点是仅仅涂覆部件面对热喷涂枪的面,并可以使用掩模来对其它区域进行保护。传统的热喷涂技术,包括等离子体喷涂,在Pawlowski所著的The Science and Engineering of Thermal SprayCoating(John Wiley,1995)中进行了阐述,因此将其整体并入本文作为参考。
一种尤其优选的热喷涂方法是等离子体喷涂。等离子体喷涂可以用来涂覆相当复杂的腔室内表面和其它腔室部件。图1所示是一种典型的等离子体喷涂工艺。将涂层材料,通常是粉体112的形式,通过一个外部进料口132注射到高温等离子体火焰114中。粉体被快速加热并加速到一个很高的速度。这种热材料碰撞到基底表面116上并迅速冷却成涂层118。
等离子体喷涂枪120包含一个阳极122和一个阴极124,二者均用水冷却。等离子体气体126(例如氩,氮,氢,氦)通常沿着箭头128所示的方向在阴极周围流过,并从阳极的收缩嘴中通过。高压放电引起局部离子化并在阴极124和阳极122之间为DC弧形成一个导电通路,由此产生等离子体。弧的电阻加热使气体形成等离子体。等离子体作为一种自由的或者中性的等离子体火焰(不带电流的等离子体)由阳极喷嘴部位喷出。当等离子体稳定并为喷涂做好准备后,电弧沿着喷嘴向下扩展。粉体112加热和加速的如此之快以至于喷嘴顶端与基底表面之间的喷涂距离136可以在125到150mm的数量级。通过使熔融或者热软化的颗粒碰撞在基底表面116上,制成了等离子体喷涂涂层。
依据本发明,可以使用诸如清洗和喷丸的表面处理技术来提供一个对于结合具有更高的化学和物理活性的表面。在涂层之前,优选地,要将衬底表面彻底清洗以消除所不希望的表面物质,比如氧化物或者油脂。也可以在涂层之前,用任何适用的方法比如喷砂将表面粗化。这种粗化能够增加结合的可用表面积,这可以增强涂层的结合强度。粗糙的表面轮廓也能够提高涂层与衬底之间的机械咬合或者互锁。
对于铝反应器部件来讲,在涂层之前,优选的要将要涂层的部件表面阳极化,但不再粗化阳极化了的表面。阳极化层为下面的铝抵抗腐蚀攻击提供了一个另外的阻挡,即除了靠涂层提供保护外的另外阻挡。在铝基底,例如6061-T6铝上形成的阳极化铝层可以具有任意合适的厚度。例如,厚度一般从大约2mil到大约10mil。阳极化了的表面可以具有任意合适的抛光度。例如,表面结构的RA值可以在大约20μinch到大约100μinch之间。阳极化层可以用任意合适的技术来密封,例如用煮沸去离子水。
依据本发明的含氧化铪,氧化锶,氧化镝和/或氧化镧的陶瓷材料优选地用等离子体喷涂工艺涂覆。但也可以使用任何其它的陶瓷材料适用的涂层方法。例如,含氧化铪,氧化锶,氧化镝和/或氧化镧的陶瓷涂层也可以通过溅射,溅射沉积,浸渍涂层,化学气相沉积,蒸发和凝结(包括电子束蒸发和凝结),物理气相沉积,热等静压,冷等静压,压铸,注模,压实和烧结,以及热喷涂进行涂覆。
在本发明的一些优选的实施方案中,含铪,锶,镝和/或镧的陶瓷部件用在一个高密度等离子体反应器中。这种类型的反应器的例子是可以从California的Fremont的Lam Research Corporation得到的TCP9400TM等离子体刻蚀反应器。在TCP 9400TM反应器中,工艺气体(例如Cl2,HBr,CF4,CH2F2,O2,N2,Ar,SF6和NF3)导入位于刻蚀腔底部的导气环中,然后通过导气孔导入到反应腔室中。图2所示是TCP 9400TM刻蚀反应器中的导气环。正如图2中所示,导气环40的主体包围在衬底支撑44的周围,导气环40的底面含有一个环状导气槽60。前面提到的导气孔50延伸到导气槽60中。
典型地,导气环40用铝制成。导气环的上表面直接暴露在等离子体中,这样就会受到侵蚀、腐蚀和侵腐蚀。为保护这些表面,导气环一般用一种铝氧化物层进行覆盖。然而,这种层相当脆,使用时在反应器使用时的反复的热循环过程中会破裂。在阳极化层中形成的裂纹会使腐蚀性的工艺气体攻击下面的铝层,减小部件寿命,并对要处理的衬底如晶片,平板显示衬底等造成金属和颗粒污染。
依据本发明的示例实施方案,可以用由含铪,锶,镝和/或镧的陶瓷材料制成的涂层42覆盖在导气环的暴露表面上。这些陶瓷材料可以涂覆在裸露的(有或者没有自生氧化物表面膜)铝层上或者铝氧化物层(例如具有阳极化表面的铝)上。当对导气环进行涂覆时,可以允许涂层部分渗透到导气孔中,对其内壁进行涂层和保护,但不能将开孔阻塞。例如,在涂层过程中,要将导气孔塞住或者掩模。
在工艺过程中要暴露在等离子体中的TCP 9400TM刻蚀反应器的其它部件也能够用依据本发明的含铪,锶,镝和/或镧的陶瓷材料进行涂覆。这些部件包括,例如腔壁,腔衬里,夹持器件以及对着衬底的介电窗。在夹持器件比如静电夹具的上表面提供依据本发明的涂层可在清洗期间对夹具提供附加的保护,此过程中没有晶片,夹具的上表面因而直接暴露在等离子体中。
另一个可包括依据本发明的含铪,锶,镝和/或镧的陶瓷材料的多晶硅刻蚀反应器的例子是同样可以从California的Fremont的LamResearch Corporation得到的VersysTM多晶硅刻蚀器或2300TM刻蚀器,如图3中所示。该反应器包含反应腔150,其中包括的衬底支撑152包括一个静电夹具154,其可以对固定在其上的衬底(没有画出)施加一个钳制力。在静电夹具154周围的衬底支撑152上固定着聚焦环(focusring)170。衬底支撑152也能用来对衬底施加一个RF偏置。衬底也能够用热交换气体比如氦来进行背冷。在2300TM刻蚀器中,工艺气体(例如Cl2,HBr,CF4,CH2F2,O2,N2,Ar,SF6或NF3)通过位于腔室150顶部并与供气舱156相连的气体注入嘴168导入腔室150中。气体注入嘴168一般用石英或者陶瓷材料比如氧化铝制成。正如所示,导电线圈158可以用适宜的RF源(没有画出)驱动来提供高密度(例如1011-1012个离子/cm3)的等离子体。导电线圈158通过介电窗160将RF能量耦合到腔室150内部。介电窗160一般由石英或者氧化铝制成。介电窗160按所示固定在环状元件162上。环状元件162将介电窗160从腔室150的顶部隔开,称作“气体分布板”。腔衬里164包围着衬底支撑152。腔室150也可以包括适宜的抽真空装置(没有画出)以使腔室内部保持在所希望的压力。
在图3中,反应器部件比如环状元件162,介电窗160,衬底支撑152,腔衬里164,气体注入嘴168,聚焦环170和静电夹具154的被选内表面按所示用依据本发明的由含铪,锶,镝和/或镧的陶瓷材料制成的涂层166涂覆。如图3中所示,腔室150和在腔衬里164下面的衬底支撑152的被选内表面也可以具有由依据本发明的由含铪,锶,镝和/或镧的陶瓷材料制成的涂层166。任何或者全部的这些表面以及任何其它的反应器内表面都能具有依据本发明的涂层。如下所述,可供选择的,任意的或者全部的这些部件可以用依据本发明的含铪,锶,镝和/或镧的陶瓷材料构成的单独个体制造。
依据本发明,这些部件能用在高密度氧化物刻蚀工艺中。一种氧化物刻蚀反应器的例子是可以从California的Fremont的Lam ResearchCorporation得到的TCP 9100TM等离子体刻蚀反应器。在TCP 9100TM反应器中,气体分布板是一个直接位于TCPTM窗下面的圆板,TCPTM窗也是位于反应器顶部的真空密封面,其位于一个处在半导体晶片之上并与之平行的平面内。气体分布板与位于气体分布板周围的气体分布环相密封。气体分布环从气源向气体分布板、位于向反应器中供应RF能量的扁平螺旋线圈式天线下面的窗的内表面和气体分布环限定的空间中供气。气体分布板包含特定直径的贯通该板的孔。可以改变贯通气体分布板的孔的空间分布以优化被刻蚀层的刻蚀均匀性,例如,抗光层,二氧化硅层和位于晶片上的底层材料。可以改变气体分布板的剖面形状以调节供入反应器等离子体中的RF能量分布。气体分布板是一种介电性的材料,能够将RF能量通过气体分布板耦合到反应器中。而且,希望气体分布板材料对在诸如氧气或碳氟烃气等离子体环境中的化学溅射刻蚀具有高度的抵抗性,以避免崩溃和由此引起的颗粒产生。
图4所示的是一个前述类型的等离子体反应器。该反应器包含反应腔10。衬底支撑12包括一个静电夹具34,其可以对衬底13施加钳制力以及RF偏置。衬底可以用热交换气体比如氦进行背冷。聚焦环14将等离子体限定在衬底上面的一个区域里。在腔室中保持高密度(例如1010-1012个离子/cm3)的等离子体的能量源,比如用适宜的RF源驱动来提供高密度等离子体的天线18置于反应器腔室10的顶部。该反应腔室包括一个抽真空装置以使腔室内部保持在所希望的压力(例如在50mTorr以下,典型的在1-20mTorr)。
在天线18和处理腔室10的内部之间是一个基本上是平板状的介电窗20,其在处理腔室10的顶部构成真空壁。气体分布板22位于窗20的下方,包括将工艺气体从气源23传到腔室10中的开口。圆锥状的衬里30从气体分布板22延伸并包围在衬底支撑12的周围。天线18可以与通道24一起提供,温度控制液可以经该通道从入口和出口管道25,26通过。然而,天线18和/或窗20无需冷却或者可以通过其它合适的技术来冷却,比如在天线和窗上进行吹风,通过冷却液或者与窗和/或气体分布板接触的热传递,等等。
在操作中,将衬底比如半导体晶片放到衬底支撑12上,并用静电夹具34固定位置。然而,也可以使用其它的钳制方法,比如机械钳制机构。另外,可以使用氦背冷以提高衬底和夹具之间的热传递。然后将工艺气体通过窗20和气体分布板22之间的空隙供入真空处理腔10中。在专利号为5824605,6048798和5863376的共同所有的US专利中公开了适宜的气体分布板(也就是喷头)的排列。这里将其中的每一个专利都整体并入本文作为参考。通过对天线18施加合适的RF源在衬底和窗之间的空间中引燃了高密度等离子体。
在图4中,反应器部件比如气体分布板22,腔衬里30,静电夹具34和聚焦环14的内表面用由依据本发明的含铪,锶,镝和/或镧的陶瓷材料构成的涂层32涂覆。然而,仅仅这些表面和/或其它表面中被选定表面的才能用依据本发明的含铪,锶,镝和/或镧的陶瓷材料涂覆。
本领域技术人员明白上述高密度多晶硅和介电刻蚀腔仅仅是包括依据本发明的部件的等离子体刻蚀反应器的示例实施方案。依据本发明的包括含铪,锶,镝和/或镧的陶瓷材料的部件可以用在任何刻蚀反应器中(例如金属刻蚀反应器)或者其它类型的其中希望减少等离子体诱发的侵蚀,腐蚀和/或侵腐蚀以及相关连的污染的半导体工艺设备中。
例如,其它的可以在其上提供依据本发明的含铪,锶,镝和/或镧的陶瓷材料涂层的部件包括,但不限于,腔壁,衬底支撑,紧固件等。这些部件一般由金属(例如铝)或者陶瓷(例如氧化铝)制成。这些金属等离子体反应器部件一般暴露在等离子体中,并经常呈现出侵蚀,腐蚀和/侵腐蚀迹象。其它的可以依据本发明进行涂层的部件可以是不直接暴露在等离子体中的,但替代的是暴露在腐蚀性气体中,比如从处理的晶片中释放出的气体或者其它类似的气体。所以,也能够依据本发明为其它的在处理半导体衬底中使用的设备提供含铪,锶,镝和/或镧的陶瓷材料表面和涂层。这些设备包括传送机构,气体供应系统,衬里,起落机构,加载锁,室门机构,机械臂,紧固件及其它类似的设备。
能够用依据本发明的含铪,锶,镝和/或镧的陶瓷材料进行涂层的金属材料的例子包括铝和铝合金,不锈钢,难熔金属,例如6061-T6铝和304以及316不锈钢。由于含铪,锶,镝和/或镧的陶瓷材料在部件上形成了一个抗磨损的涂层,下面的部件被保护不再直接暴露在等离子体中。因此,就可以保护金属性的衬底免受等离子体的侵蚀,腐蚀和/或侵腐蚀的冲击。结果,金属材料,比如铝合金,就可以在使用时不必考虑合金添加剂,晶粒结构或者表面条件。
另外,许多陶瓷或者聚合物材料也可以用依据本发明的含铪,锶,镝和/或镧的陶瓷材料进行涂层。特别地,反应器部件可以用陶瓷材料包括,但不限于,氧化铝(Al2O3),碳化硅(SiC),氮化硅(Si3N4),碳化硼(B4C)和/或氮化硼(BN)来制造。能够被涂层的聚合物材料优选的是那些能够抵御等离子体反应器中存在的高温条件的材料。
如果需要,在含铪,锶,镝和/或镧的陶瓷材料涂层和被涂覆的衬底表面之间可以提供一个或者多个中间材料层。图5所示的是依据本发明的一个优选实施方案的已涂层了的部件。可选地,通过一种传统技术将第一中间涂层80涂覆在衬底70上。这种可选的第一中间层80是足够厚的,可以附着在衬底上,而且允许在制备第二中间涂层90或者所述含铪,锶,镝和/或镧的陶瓷材料涂层100之前对其进行处理。第一中间涂层80和第二中间涂层90可以具有任意合适的厚度,只要能够提供所希望的性能。这些涂层的厚度至少大约0.001英寸,优选的从大约0.001英寸到大约0.25英寸,更优选的从大约0.001英寸到大约0.15英寸,最优选的从大约0.001英寸到大约0.05英寸。
在将可选的第一中间涂层80淀积在反应器部件70上之后,可以用任意适用的技术将该涂层进行处理,比如粗化,然后再在上面涂上可选的第二涂层90或者含铪,锶,镝和/或镧的陶瓷材料涂层100。粗化的第一中间涂层80为后续的涂层提供了相当好的结合。所希望的是,第二中间涂层90能给第一中间涂层80带来高的机械压缩强度并减少第二中间涂层90中裂纹的形成。
这种可选的第二中间涂层90是足够厚的,可以附着在第一中间涂层80上,而且进一步允许在制备任意的其它附加中间涂层或者外面的含铪,锶,镝和/镧的陶瓷材料涂层100之前对其进行处理。第二中间涂层90也可以进行比如粗化处理。第二中间涂层90可以具有任意合适的厚度,只要能够提供这些所希望的性能,比如厚度至少为大约0.001英寸,优选的从大约0.001英寸到大约0.25英寸,更优选的从大约0.001到大约0.15英寸,最优选的从大约0.001英寸到大约0.05英寸。
这些第一和第二中间涂层可以用任意适用于半导体等离子体工艺腔中的金属,陶瓷和聚合物材料制成。特别希望的能够采用的金属包括,但不限于,难熔金属,其可以抵御高的工艺温度。优选的陶瓷包括,但不限于,Al2O3,SiC,Si3N4,BC,AlN,TiO2以及它们的混和物。优选的聚合物包括,但不限于,含氟聚合物,如聚四氟乙烯和聚酰亚胺。
这些中间涂层可用任意适用的淀积技术来涂覆,如镀层(例如化学镀或者电镀),溅射,浸渍涂层,化学气相沉积,物理气相沉积,电泳沉积,热等静压,冷等静压,压铸,浇注,压实和烧结,以及热喷涂(例如等离子体喷涂)。
可选的第一中间涂层80和第二中间涂层90依赖于所需的性能,可以彼此具有相同的或者不同的组成。如果需要,在涂层和衬底之间还可以提供相同或者不同材料的另外的中间涂层,比如第三,第四或者第五中间涂层。
图6所示的是依据本发明的含铪,锶,镝和/或镧的陶瓷材料涂层的另一个示例实施方案。涂层100直接淀积在衬底上,其是部件70的一个外表面。该涂层具有可为部件提供所希望的抗磨损水平的任意合适的厚度。特别的,涂层100的厚度在大约0.001英寸到大约1英寸的范围,优选的从大约0.001英寸到大约0.5英寸,最优选的从大约0.001英寸到大约0.05英寸。可以选择陶瓷层的厚度以与在反应器(例如刻蚀,CVD等)中要遇到的等离子体环境相容。
如上所讨论的,热喷涂是提供具有依据本发明的涂层表面的部件的优选方法。然而,其它的涂层方法也可以使用,包括,例如,其它的淀积技术,像溅射,浸渍涂层,化学气相沉积和物理气相沉积,热等静压,冷等静压,压铸,浇注,以及压实和烧结技术。
如上所述,半导体工艺设备的部件也可以用含铪,锶,镝和/或镧的陶瓷材料制成单独的个体。这些单独个体可以是分离体或者其它部件的覆盖层。例如,依据本发明的含铪,锶,镝和/或镧的陶瓷材料可以制成覆盖层,比如衬里,形成后盖住反应器部件的暴露表面。这些覆盖层可用任意适用的固定技术附在反应腔室内的表面上,包括,例如,粘附结合或者机械紧固。当采用紧固件时,紧固件自身如果暴露在等离子体中,也优选用抗侵蚀的材料来制造,以提高它们的使用寿命。另外,可以将含铪,锶,镝和/或镧的陶瓷材料覆盖层制成与下面的反应器部件互锁。整体式的覆盖层可以提供在任意合适的衬底上,比如像腔壁以及其它的表面。
用含铪,锶,镝和/或镧的陶瓷材料制成单独个体的示例方法可包括制备含,例如氧化铪,氧化锶,氧化镝和/或氧化镧的浆料,按所期望的形状和尺寸成型生坯,将坯体烧结成烧结体。可以将生坯制成任何所希望的等离子体反应器部件的形状。在W.D.Kingery,H.K.Bowen和D.R.Uhlmann(J.Wiley 8c sons,1976)所著的Introduction to Ceramics第二版中详细给出了陶瓷工艺技术,这里将其整个内容并入作为参考。
优选的单独个体部件是等离子体反应器中的暴露在等离子体中的部件。适用的部件可以包括,例如,腔壁,衬底支撑,包括喷头,折流板,套环,喷嘴等的气体分布系统,紧固件,加热元件,等离子体屏,衬里,传输模块部件,例如:机械臂,紧固件,内外腔壁等,以及其它相似的部件。这些部件的一个具体例子是图7中所示的反应器部件110。反应器部件110是用含氧化铪,氧化锶,氧化镝和/或氧化镧的陶瓷材料制成的单独体。
含氧化铪,氧化锶,氧化镝和/或氧化镧的陶瓷材料可以提供在全部的或者部分的反应器腔室和部件上。在一个优选的实施方案中,该涂层或者单独体提供在暴露于等离子体环境中的反应腔室的区域上,比如那些与等离子体直接接触的部分或者位于腔室部件(例如衬里)后面的部分。另外,含氧化铪,氧化锶,氧化镝和/或氧化镧的陶瓷材料涂层或者单独体优选地用在那些要承受相对较高的偏置电压(即相对较高的溅射离子能量)的反应腔室的区域上。
依据本发明,通过将含铪,锶,镝和/或镧的陶瓷材料用作涂层或覆盖层,或者制成单独的含铪,锶,镝和/或镧的陶瓷部件,实现了一些优点。也就是说,在等离子体反应器中,得到了较低的侵蚀速度。结果,依据本发明的含铪,锶,镝和/或镧的陶瓷涂层,覆盖层和部件可以降低金属和颗粒污染的水平,通过提高耗材的使用寿命而降低成本,降低工艺漂移,并能减少腔室部件和衬底的腐蚀水平。
依据本发明的含铪,锶,镝和/或镧的陶瓷涂层和部件可以提供极硬的,抗磨损的表面。这些涂层和部件希望不含与工艺腔气体反应的物质,是化学惰性的,这些就会有低的或者没有颗粒污染,小的或者没有腐蚀,小的或者没有金属污染以及/或者少的或者没有挥发性的刻蚀产物。
尽管已参照具体的实施方案对本发明进行了详细描述,本领域技术人员明显明白,只要不脱离所附权利要求的范围,可以进行各种修改和完善,可以使用等价的操作。
Claims (40)
1.一种半导体工艺设备部件,包括至少一个包含陶瓷材料的部分,该部分包括该部件的最外表面,并且这种陶瓷材料包括选自氮化铪,硼化铪,碳化铪,氟化铪,氧化锶,氮化锶,硼化锶,碳化锶,氟化锶,氧化镧,氮化镧,硼化镧,碳化镧,氟化镧,氧化镝,氮化镝,硼化镝,碳化镝和氟化镝中的材料作该陶瓷材料的单一最大组分。
2.权利要求1中的部件,其中的陶瓷材料包括氧化锶,氧化镧和氧化镝中的一种作单一最大组分。
3.权利要求1中的部件,其中部件包括一个基底,以及在该基底之上的陶瓷材料涂层。
4.权利要求3中的部件,其中涂层的厚度从大约0.001in.到大约0.050in.。
5.权利要求3中的部件,其中涂层基本上全由这种陶瓷材料组成。
6.权利要求3中的部件,进一步包括:
在基底上至少有一个中间层;
其中所述涂层位于这种至少一个的中间层上。
7.权利要求1中的部件,其中的陶瓷材料进一步包括至少一种选自(i)元素周期表中的IIA,IIIA,IVA,VA,VIA,VIIA,VIIIA,IB,IIB,IIIB,IVB和VB族中的元素的氧化物,氮化物,硼化物,氟化物和碳化物;以及(ii)元素周期表中锕系元素的氧化物,氮化物,硼化物,氟化物和碳化物中的材料。
8.权利要求1中的部件,其选自腔壁,腔衬里,气体分布板,导气环,底座,介电窗,静电夹具和等离子体聚焦环。
9.一种包括至少一个依据权利要求1的部件的等离子体刻蚀反应器。
10.一种制造依据权利要求1的半导体工艺设备部件的方法,包括将陶瓷材料以涂层形式施加在基底上,该涂层包括该部件的一个最外表面。
11.权利要求10中的方法,其中的陶瓷材料包括氧化锶,氧化镝和氧化镧中的一种作单一最大组分。
12.权利要求10中的方法,进一步包括将基底表面粗化,在粗化的表面上涂覆这种陶瓷材料以提高陶瓷材料在基底上的粘附性。
13.权利要求10中的方法,其中的涂层基本上全由这种陶瓷材料组成。
14.权利要求10中的方法,进一步包括:
在基底上涂覆至少一个中间层;
并在这种至少一个的中间层上涂覆该涂层。
15.权利要求14中的方法,进一步包括如下至少之一:
在涂覆所述至少一个的中间层之前对衬底进行处理,以提高这种至少一个的中间层在基底上的粘附性;
在涂覆该陶瓷材料之前对这种至少一个的中间层进行处理,以提高该陶瓷材料在这种至少一个的中间层上的粘附性。
16.权利要求10中的方法,其中的陶瓷材料通过热喷涂涂覆在衬底上。
17.权利要求10中的方法,其中的陶瓷材料进一步包括至少一种选自(i)元素周期表中的IIA,IIIA,IVA,VA,VIA,VIIA,VIIIA,IB,IIB,IIIB,IVB和VB族中的元素的氧化物,氮化物,硼化物,氟化物和碳化物;以及(ii)元素周期表中锕系元素的氧化物,氮化物,硼化物,氟化物和碳化物中的材料。
18.一种制造依据权利要求1中的半导体工艺设备部件的方法,包括将该部件做成一个基本上全由该陶瓷材料构成的单独体。
19.一种半导体工艺设备部件,包括:
(a)一个完全由一种包括氧化铪,氮化铪,硼化铪,碳化铪和氟化铪中的一种作为其单一最大组分的陶瓷材料组成的单独体;或者
(b)一个包括一个含有金属或者聚合物的基底以及一个在该基底上的陶瓷材料涂层的复合体,这种涂层构成此部件的最外表面。
20.权利要求19中的部件,其中的陶瓷材料基本上全由氧化铪组成。
21.权利要求19中的部件,其中的陶瓷材料进一步包括至少一种选自(i)元素周期表中的IIA,IIIA,IVA,VA,VIA,VIIA,VIIIA,IB,IIB,IIIB,IVB和VB族中的元素的氧化物,氮化物,硼化物,氟化物和碳化物;以及(ii)元素周期表中锕系元素的氧化物,氮化物,硼化物,氟化物和碳化物中的材料。
22.权利要求19中的部件,其中这种复合体进一步包括:
在基底上至少有一个中间层;
在这种至少一个的中间层上的所述陶瓷涂层。
23.权利要求19中的部件,其选自腔壁,腔衬里,气体分布板,导气环,底座,介电窗,静电夹具和等离子体聚焦环。
24.权利要求19中的部件,其中的单独体和涂层基本上全由该陶瓷材料组成。
25.一种包括至少一个依据权利要求19的部件的半导体工艺设备。
26.一种制造依据权利要求19的半导体工艺设备部件的方法,包括:
(a)制造基本上完全由这种陶瓷材料组成的单独体;或者
(b)将此陶瓷材料涂覆在基底上作涂层,这样,该涂层构成此复合体的最外表面。
27.权利要求26中的方法,其中涂层的厚度从大约0.001in.到大约0.050in.。
28.权利要求26中的方法,进一步包括:
在基底上涂覆至少一个中间层;
并在这种至少一个的中间层上涂覆该涂层。
29.权利要求28中的方法,其中:
基底是金属基底;并且
该方法进一步包括如下至少之一:
在涂覆所述至少一个的中间层之前对基底进行处理,以提高这种至少一个的中间层在基底上的粘附性;以及
在涂覆该陶瓷材料之前对这种至少一个的中间层进行处理,以提高该陶瓷材料在这种至少一个的中间层上的粘附性。
30.权利要求26中的方法,其中:
基底是金属基底;并且
涂层通过热喷涂涂覆在基底上。
31.权利要求26中的方法,其中的陶瓷材料进一步包括至少一种选自(i)元素周期表中的IIA,IIIA,IVA,VA,VIA,VIIA,VIIIA,IB,IIB,IIIB,IVB和VB族中的元素的氧化物,氮化物,硼化物,氟化物和/或碳化物;以及(ii)元素周期表中锕系元素的氧化物,氮化物,硼化物,氟化物和碳化物中的材料。
32.权利要求26中的方法,其中的部件选自腔壁,腔衬里,气体分布板,导气环,底座,介电窗,静电夹具和等离子体聚焦环。
33.一种由权利要求26中的方法制成的等离子体反应器部件。
34.一种制造半导体工艺设备的方法,包括
制备一种包含至少一种选自氧化铪,氮化铪,硼化铪,碳化铪,氟化铪,氧化锶,氮化锶,硼化锶,碳化锶,氟化锶,氧化镧,氮化镧,硼化镧,碳化镧,氟化镧,氧化镝,氮化镝,硼化镝,碳化镝和氟化镝中的陶瓷材料作其单一最大组分的浆料;
用此浆料制备生坯;以及
将此生坯烧结成部件。
35.权利要求34中的方法,其中的浆料包括氧化铪,氧化锶,氧化镧和氧化镝中的一种作此浆料的单一最大组分。
36.权利要求34中的方法,其中部件基本上全由这种至少一种的陶瓷材料组成。
37.权利要求34中的部件,其中部件包括氧化铪作单一最大组分。
38.权利要求34中的方法,其中的陶瓷材料进一步包括至少一种选自(i)元素周期表中的IIA,IIIA,IVA,VA,VIA,VIIA,VIIIA,IB,IIB,IIIB,IVB和VB族中的元素的氧化物,氮化物,硼化物,氟化物和/或碳化物;以及(ii)元素周期表中锕系元素的氧化物,氮化物,硼化物,氟化物和碳化物中的材料。
39.权利要求34中的方法,其中的部件选自腔壁,腔衬里,气体分布板,导气环,底座,介电窗,静电夹具和等离子体聚焦环。
40.一种由权利要求34中的方法制成的等离子体刻蚀反应器的部件。
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KR20040101330A (ko) | 2004-12-02 |
CN100357489C (zh) | 2007-12-26 |
TW200802545A (en) | 2008-01-01 |
US6780787B2 (en) | 2004-08-24 |
US8935990B2 (en) | 2015-01-20 |
JP2005521250A (ja) | 2005-07-14 |
JP2010153881A (ja) | 2010-07-08 |
AU2003210966A1 (en) | 2003-10-08 |
US20090123735A1 (en) | 2009-05-14 |
KR101024514B1 (ko) | 2011-03-31 |
US20130059071A1 (en) | 2013-03-07 |
US20030181065A1 (en) | 2003-09-25 |
US20090068845A1 (en) | 2009-03-12 |
EP1495155A1 (en) | 2005-01-12 |
US20050003240A1 (en) | 2005-01-06 |
TWI300587B (en) | 2008-09-01 |
TW200305198A (en) | 2003-10-16 |
TWI299182B (en) | 2008-07-21 |
US20090120790A1 (en) | 2009-05-14 |
US8318327B2 (en) | 2012-11-27 |
WO2003080892A1 (en) | 2003-10-02 |
IL163917A (en) | 2009-11-18 |
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