CN1250490A - 碳化硅薄膜的基座设计 - Google Patents
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Abstract
一种用来最小化或消除外延生长过程中影响衬底晶片的温度梯度的基座,包含:第一基座部分,它包括用来在其上接纳半导体衬底晶片的表面;以及第二基座部分。此基座的特征是,第二基座部分面对衬底接纳表面并与衬底接纳表面隔开,其间距大得足以使气体能够在其间流动,以便在表面的衬底上进行外延生长,同时又小得足以使第二基座部分能够将衬底的暴露表面加热到与第一基座部分将直接接触衬底接纳表面的衬底的表面所加热到的温度基本上相同的温度。
Description
本发明涉及到半导体制造工艺,确切地说是涉及到用来在碳化硅衬底上进行外延生长的改进了的基座的设计。
本发明涉及到在碳化硅衬底上的半导体材料外延层的制作。碳化硅提供了许多半导体性能和器件的优良的物理和电子特性。这些特性包括宽的带隙、高的热导率、高的饱和电子漂移速度、高的电子迁移率、优越的机械强度、以及辐射硬化。
如硅之类的其他半导体材料的情况那样,制造大量碳化硅基器件的一个基本步骤包括在碳化硅衬底上生长半导体材料的薄的单晶层。此技术称为“外延”,此术语描述一种利用化学反应的晶体生长,用来在另一种晶体的表面上制作具有一定晶格结构的半导体材料薄层。在许多情况下,外延层的晶格结构与衬底的晶格结构完全相同、相似或有关系。因此,无论是在碳化硅衬底上外延生长碳化硅外延层,或者是在碳化硅衬底上外延生长其他半导体材料,都是制造基于碳化硅的器件的基本技术。
然而,由于碳化硅能够结晶成150种以上的多型体,且这些多型体中的某一些彼此的热力学差异非常小,故碳化硅是一种难以制作的材料。而且,由于碳化硅的熔点高(2700℃以上),故包括外延膜淀积在内的许多制作碳化硅的工序常常需要在比其他半导体材料中的类似反应高得多的温度下进行。
在例如Sze的论文(见Physics of Semiconductor Devices,2dED.(1981),Section 2.2,pp.64-73)或在Dorf的论文(见The ElectricalEngineering Handbook,CRC Press,(1993)at Chapter 21“Semiconductor Manufacturing”,pp.475-489)中,特别是在Sherman的论文(见Chemical Vapor Deposition for Microelectronics:Principles,Technologies and Applications,(1987),ISBN 0-8155-1136-1)中,能够找到半导体制造工艺的一些基本观点。此处所讨论的技术和装置可以归类为化学汽相淀积(CVD)或汽相外延(VPE),其中的反应气体被暴露于一种能源(例如热、等离子体、光),以激发化学反应,其产物生长在衬底上。
CVD外延生长有一些基本的技术,其中二个最常用的是热加热壁反应器工艺和冷壁反应器工艺。热壁系统有点类似于常规炉子,其中的衬底、外延生长先质材料以及周围的容器,都被升温到反应温度。此技术有一些优点和缺点。
第二种常用技术是采用“冷壁”反应器。在这种系统中,待要用来外延生长的衬底被置于容器(通常由石英或不锈钢组成)中的平台上。在许多系统中,衬底是盘状的并称为“晶片”。衬底平台由会吸收并热响应电磁辐射的材料制成。
如熟悉这种器件和技术的人员所熟知的那样,基座对电磁辐射的响应是一种感应过程,其中加于基座的交变频率电磁辐射在基座中产生感应电流。基座将部分能量从感应电流转换成热。在许多系统中,由于玻璃和石英之类的材料对射频(RF)是透明的且不受其影响,故电磁辐射被选择在射频范围内。于是,电磁辐射通过容器并被基座吸收,基座与晶片一起被加热到进行外延生长所要求的温度。由于容器壁不受电磁能量的影响,故容器壁保持“冷”态(至少比基座和衬底冷),从而促使在衬底上发生化学反应。
在例如授予Davis等人的美国专利No.4912063和授予Kong等人的美国之类4912064中,提出了对碳化硅衬底上生长碳化硅外延层的详尽讨论,此处将二者的内容整个列为参考。
采用冷壁反应器来进行外延生长,虽然在许多方面是满意的,但也引起其他的一些问题。特别是由于半导体晶片置于基座上,与基座接触的晶片一侧将比衬底的其余部分更热。这就在晶片中沿轴向引起温度梯度。轴向梯度在晶片中引起的热膨胀差异尔后容易引起外围边沿(由于大多数晶片是盘状的,故通常是圆周)从基座翘曲,从而与基座脱离接触。由于边沿与基座脱离接触,其温度就变得比更靠中心的晶片部分的温度低,于是,除了轴向温度梯度外,还在衬底中产生径向温度梯度。
这些温度梯度和引起的物理缺陷,对衬底及其上的外延层的特性有相应的负面影响。例如,若边沿处于极度拉伸状态,则已观察到毁灭性的破裂和失效。即使避免了毁灭性的失效,外延层也易于包含缺陷。在碳化硅CVD生长温度(例如1300-1800℃)下使用大晶片(亦即2英寸或更大)时,晶片弯曲变成一个重要问题。例如,此处图3示出了不同的轴向温度梯度下晶片弯曲(H)量对晶片直径的函数关系。
而且,由于晶片具有有限的厚度,故基座施加的热倾向于沿晶片中心轴产生另一个温度梯度。这一轴向梯度能够产生并恶化上述问题。
在衬底晶片的背面与基座正面之间,通常还存在另一个温度梯度,亦即表面-表面梯度。于是可以理解,在基座与衬底晶片之间通常发生辐射和传导二种热传送。由于许多基座是由涂敷有碳化硅的石墨制成的,故基座与碳化硅晶片之间大的温度梯度引起的热力学驱动力还使碳化硅涂层不希望有地从基座升华到晶片。
此外,由于这种升华倾向于促使在基座涂层中形成针孔,故能够使来自石墨的沾污物逸出并对衬底到外延层形成非有意掺杂。这就最终导致半导体材料中的不均匀掺杂水平,并缩短基座的寿命。在例如授予Kong等人的美国专利No.5119540的背景部分中,描述了不希望有地发射掺杂剂的基座所产生的问题。
虽然如此,仍然需要能够在碳化硅工艺所要求的高温下工作而同时最小化或消除这些径向、轴向和表面温度梯度、以及相关的物理改变和问题的基座。
因此,本发明的目的是提供一种用来最小化或消除衬底晶片上的径向、轴向以及表面-表面温度梯度的基座。
本发明用一种基座满足了这一目的,此基座包含:第一部分,它包括用来在其上接纳半导体衬底晶片的表面、以及第二部分,它面对衬底接纳表面并与衬底接纳表面隔开一个大得足以允许基本组分能够流过其间以便在衬底上进行外延生长的间距。然而,为了使第二基座部分将衬底的暴露表面加热到与第一基座部分将直接接触衬底接纳表面的衬底的表面加热到基本上相同的温度,此间距保持尽可能小。
在另一种情况下,本发明是一种借助于加热面向但避免接触半导体衬底并与衬底隔开足够远以便允许基本组分能够在衬底和基座部分之间流动,以便促使在面对基座部分的衬底上外延生长的基座部分,从而在外延生长过程中最小化或消除衬底中以及衬底周围的温度梯度的方法,其中的基座对辐射发生热响应。
考虑到结合描述最佳示范性实施例的附图的下列详细描述,将更容易了解本发明的上述和其它目的、优点和特点及其制造方法。
图1是平台式化学汽相淀积(CVD)系统的剖面图;
图2是筒式CVD系统的剖面图;
图3是示出了不同温度梯度下晶片弯曲与晶片直径的关系;
图4是筒式基座的示意图;
图5是晶片弯曲与温度梯度的示意图;
图6是根据本发明的基座的一个实施例的剖面图;
图7是本发明的基座的第二实施例的局部剖面图;
图8是扁平式基座的剖面图;
图9是根据本发明的扁平式基座的俯视平面图。
本发明是用来最小化或消除外延生长过程中影响衬底晶片的包括径向、轴向和表面-表面梯度的温度梯度的一种基座。根据本发明的衬底对图1和2所示的化学汽相淀积系统特别有用。图1示出了用20概括表示的平台式即扁平式CVD系统。此系统包含通常由石英管材料制成的对适当频率的电磁辐射基本上透明的反应容器21即钟罩。气体供应系统与反应容器21流体连通,并在图1中被示为气体注入器22。
此系统包括电磁辐射源,在图1中被示为感应线圈25。这种发生器和感应线圈的工作是本技术领域一般熟练人员众所周知的,因而此处不作更详细的讨论。正如本技术领域还了解的那样,变通的加热技术可以包括电阻加热、辐射灯加热和相似的技术。
图1所示的化学汽相淀积系统还包括其上有半导体衬底,通常为盘状晶片27的平台式基座26。图1还示出了用来按需要抽空系统的抽气口30。
图2示出了一种基本工作非常相似的系统,但这是一种筒式而非扁平式的基座。在图2中,CVD系统概括地用32表示,并示出了被水套34环绕的反应容器33,水套34使水向反应容器33的壁循环。此CVD系统32还包括气体入口35和气体出口36、水入口37和水出口40、以及基座的提升和旋转装置41。
基座本身概括地用42表示,成稍微倾斜的普通圆筒形状的截头圆锥形状。此圆筒由多个相邻的确定此圆筒的笔直侧壁区段43构成。多个晶片坑44位于侧壁43上并将半导体衬底支持于其上。基座的少许倾斜有利于将晶片保持在坑44中,并由于促使更有利的气流而改善得到的外延层的均匀性。图2还示出了概括地用46表示的用于感应线圈的电源45。
图3有助于说明本发明所提及的问题。在图3中,对于三种不同的温度梯度ΔT,以千分之几英寸为单位的晶片弯曲按单位为英寸的晶片直径绘出。如图3所示,基座表面温度为1530℃,而晶片厚度为12密尔(0.012英寸)。如图3所示,当衬底晶片的直径约为1英寸或更小时,晶片弯曲问题不大。对于更大的晶片,特别是2英寸、3英寸或甚至4英寸的晶片,即使在比较低的温度梯度下,弯曲也变得更为严重。
图4示出了相似于图2中所用的筒式基座。采用与图2相同的参考号系统,基座概括地用42表示,由多个一起确定普通圆筒形的笔直侧壁43构成。侧壁43包括多个用来支持衬底晶片的晶片坑44。
图5是示于图3的温度梯度的作用的示意图,包括轴向温度梯度(ΔT1)和径向温度梯度(ΔT2)。
图6示出了根据本发明的最适合于用在图2所示的筒式系统中的一种基座。在图6所示的实施例中,基座概括地用50表示,是由多个相邻的笔直的侧壁区段51组成的圆筒。图6示出了剖面中的二个侧壁和侧视图中的一个侧壁。最通常为4个、6个或8个笔直的侧壁51,由对选定频率的电磁辐射有热响应的材料组成。如上所示,最常用的电磁辐射处于射频频率范围内,故基座材料一般选择为对这种RF频率有热响应。在最佳实施例中,基座50由涂敷有碳化硅的石墨制成。
在此最佳实施例中,采用充分利用固态技术固有效率优点的固态电源,施加8-10千赫兹范围的电磁辐射。熟悉感应CVD工艺的人员知道,较厚的基座壁需要较低的频率以达到最有效的渗透。
在图6的实施例中,基座50包括圆筒内圆面上的多个晶片坑52。于是,当基座50被加热时,对面的壁对晶片的正面进行辐射加热,而基座对背面加热。如图6所示,在此实施例中,侧壁51最好确定一个比真正圆锥具有稍浅斜度的倒置截头圆锥。如早先所指出的那样,侧壁51的稍浅斜度使得在化学汽相淀积过程中更容易将晶片保持在坑52中,并有助于提供CVD气体的适当流型。
图7示出了本发明的另一实施例,其中的基座包含概括地用54表示的第一圆筒(即“筒”)。此圆筒由多个相邻的笔直的侧壁区段55确定,并由对选定频率的电磁辐射有热响应的材料组成。圆筒54包括侧壁区段55外表面上的多个晶片坑56。
概括地用57表示的第二圆筒围绕着第一圆筒54,并在第一和第二圆筒之间确定一个环形空间A。第二圆筒57也由对选定频率的电磁辐射有热响应的材料组成,且第一和第二圆筒(54,57)之间的环形空间大得足以允许气体在其间流动以便在晶片坑56中的衬底上进行外延生长,同时又小得足以使第二圆筒57能够将衬底的暴露表面加热到与第一圆筒54将直接接触第一圆筒的衬底表面所加热到的基本上相同的温度。
第一和第二圆筒54和57可以由相同的或不同的材料制成。若用在图2所示的筒式基座中,则第二圆筒57倾向于将第一圆筒54加热到基本上达到相同的温度。如在其它实施例中那样,每个圆筒最好由涂敷有碳化硅的石墨制成。
可以理解,采用涂敷在这种基座上的碳化硅涂层,是多晶碳化硅的陶瓷性质的一种用途,而不与其它情况下的半导体性质有关。于是,由不锈钢、石墨、涂敷有碳化硅的石墨、或碳化硅制成的基座就通常在半导体工业中被用于CVD工艺。
图8、9和10示出了根据本发明的另一种基座。图8和9分别示出了概括地用60表示的扁平状即平板形基座的剖面图和俯视平面图。基座60具有顶表面61,用来在其上接纳半导体衬底晶片。在此实施例中,本发明还包含一个平行于第一基座部分60的晶片接纳表面61并位于其上方的水平排列的第二基座部分63。基座部分60和63都由对选定频率的电磁辐射有热响应的材料组成,且如前述实施例那样,最好由对同一频率的电磁辐射有响应的相同的材料组成。基座部分60和63都由涂敷有碳化硅的石墨组成则更好。如在前述实施例中那样,二个部分60和63之间的B所示的间距大得足以允许气体在其间流动以便在表面61的衬底上进行外延生长,同时又小得足以使第二基座部分63能够将衬底的暴露表面加热到与第一基座部分60将直接接触衬底接纳表面61的衬底的表面所加热到的基本上相同的温度。如图8、9和10所示,第一水平基座部分60的顶表面61最好包括多个晶片坑64。
在这些实施例的每一个中,可以理解,正如不同情况下可能希望或需要的那样,二个基座部分可以彼此连接,或者可以是一个基座的分立部分或者是独立部分。此外,可以借助于计算机模拟或实际应用来确定衬底各部分之间的最佳间距,而不必要求过分的实验。
在另一种情况下,本发明包含最小化或消除外延生长过程中衬底中的温度梯度的方法。在此情况下,本发明包含对面向但避免接触半导体衬底晶片并离晶片远得足以使气体能够在衬底与面对的基座之间流动从而促进在面向基座部分的衬底上的外延生长的基座或基座部分进行辐照。如在结构实施例中那样,基座对辐照有热响应。
如本发明的结构方面进一步指出的那样,本发明最好还包含同时辐照其上置有晶片的分立的基座部分,以便将衬底的暴露表面加热到与直接接触其它基座部分的衬底的表面基本上相同的温度。
此方法还包含引导源气体在被加热的基座部分之间流动的步骤。若外延层由碳化硅组成,则此方法最好包含引导诸如硅烷、乙烯、丙烷之类的含硅和碳的源气体。
当诸如III族的氮化物之类的其它材料在碳化硅上形成外延层时,引导源气体的步骤可以包括引导诸如三甲基铝、三甲基镓、三甲基铟、氨之类的气体。
在最佳实施例中,本方法还包含制备用于生长的衬底表面的步骤。如上面所引用的参考文献中更为详细描述的那样,这一制备可以包含诸如对表面进行氧化的步骤,随之化学腐蚀步骤以清除被氧化的部分,从而留下制备过的表面,或者对碳化硅表面进行干法腐蚀,从而为进一步生长而制备表面。如在大多数外延生长技术中那样,表面制备通常还包含在氧化或腐蚀之前对衬底表面进行研磨和抛光。
在附图和说明书中,已经公开了本发明的典型最佳实施例,虽然使用了具体的术语,但这仅仅是用于一般的和叙述的意义,而不是为了限制,在下列权利要求中提出了本发明的范围。
Claims (20)
1.一种用来最小化或消除外延生长过程中影响衬底晶片的温度梯度的基座,所述基座包含:
第一基座部分,它包括用来在其上接纳半导体衬底晶片的表面;以及
第二基座部分;
其特征是,所述第二基座部分面对所述衬底接纳表面并与所述衬底接纳表面隔开,所述间距大得足以使气体能够在其间流动,以便在所述表面上的衬底上进行外延生长,同时又小得足以使所述第二基座部分能够将衬底的暴露表面加热到与所述第一基座部分将直接接触所述衬底接纳部分的衬底的表面所加热到的温度基本上相同的温度。
2.一种化学汽相淀积系统,它包含:
由对电磁辐射基本上透明的材料制成的反应容器;
与所述反应容器流体连通的气体供应系统;
所述反应容器外部的电磁辐射源;以及
所述反应容器中的根据权利要求1的基座。
3.根据权利要求2的化学汽相淀积系统,其中所述反应容器由石英制成。
4.根据权利要求2的化学汽相淀积系统,其中所述反应容器由不锈钢制成。
5.根据权利要求2的化学汽相淀积系统,其中所述电磁辐射源包含围绕所述反应容器的感应线圈。
6.根据权利要求1或权利要求2的基座,其中所述第一基座部分由对电磁辐射有热响应的材料制成。
7.根据权利要求1或权利要求2的基座,其中所述第二基座部分由对电磁辐射有热响应的材料制成。
8.根据权利要求1或权利要求2的基座,其中所述第一和第二部分由相同的材料制成。
9.根据权利要求1或权利要求2的基座,其中所述第一和第二部分由不同的材料制成。
10.根据权利要求1或权利要求2的基座,其中所述第一和第二基座部分由涂敷有碳化硅的石墨制成。
11.根据权利要求1或权利要求2的基座,其中所述衬底接纳表面还包含多个晶片坑。
12.根据权利要求1或权利要求2的基座,其中所述第一和第二部分一起确定由多个确定圆筒的相邻的笔直的侧壁区段组成的圆筒,所述圆筒的内周面上有多个晶片坑。
13.根据权利要求12的基座,其中所述侧壁确定一个倒置的截头圆锥。
14.根据权利要求1或权利要求2的基座,其中:
所述第一部分包含由多个确定圆筒的相邻的笔直的侧壁区段组成的第一圆筒,所述圆筒由对选定频率的电磁辐射有热响应的材料制成,并在所述侧壁区段的外表面上具有多个晶片坑;以及
所述第二部分包含围绕所述第一圆筒并确定所述第一和第二圆筒之间的环形空间的第二圆筒,所述第二圆筒由对选定频率的电磁辐射有热响应的材料制成,所述第一和第二圆筒之间的环形空间大得足以使气体能够在其间流动,以便在所述晶片坑中的衬底上进行外延生长,同时又小得足以使所述第二圆筒能够将衬底的暴露表面加热到与所述第一圆筒将直接接触所述第一圆筒的衬底的表面所加热到的温度基本上相同的温度。
15.根据权利要求1或权利要求2的基座,其中所述第一基座部分水平定位,并由对选定频率的电磁辐射有热响应的材料制成,且具有在其上接纳半导体衬底晶片的顶表面;以及
所述第二基座部分平行且隔开于所述第一基座部分的所述晶片接纳表面,并由对选定频率的电磁辐射有热响应的材料制成,所述空间大得足以使气体能够在其间流动,以便在所述表面上的衬底上进行外延生长,同时又小得足以使所述第二基座部分能够将衬底的暴露表面加热到与所述第一基座部分将直接接触所述衬底接纳表面的衬底的表面所加热到的温度基本上相同的温度。
16.根据权利要求15的基座,其中所述第一基座部分的所述顶表面包括多个晶片坑。
17.一种用来最小化或消除外延生长过程中影响衬底的温度梯度的方法,此方法包含:
加热面向半导体衬底但避免与半导体衬底接触的、且离衬底远得足以使气体能够在衬底与基座部分之间流动,以便促使在面对基座部分的衬底上进行外延生长的基座部分。
18.根据权利要求17的方法,还包含同时加热其上置有晶片的第二基座部分,以便将衬底的暴露表面加热到与直接接触第二基座部分的衬底的表面的温度基本上相同的温度。
19.根据权利要求17的方法,其中的加热步骤包含用某些频率范围内的电磁辐射,辐照对这些频率的电磁辐射有热响应的基座。
20.根据权利要求17的方法,还包含将源气体引导流到被加热的基座部分之间的步骤。
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CN103243313A (zh) * | 2013-05-22 | 2013-08-14 | 光垒光电科技(上海)有限公司 | 衬底支撑结构、含有上述衬底支撑结构的反应腔室 |
CN104746037A (zh) * | 2013-12-29 | 2015-07-01 | 北京北方微电子基地设备工艺研究中心有限责任公司 | 反应腔和mocvd设备 |
Also Published As
Publication number | Publication date |
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CA2284771A1 (en) | 1998-10-01 |
DE69801987T2 (de) | 2002-05-02 |
WO1998042897A1 (en) | 1998-10-01 |
KR100504634B1 (ko) | 2005-08-04 |
KR20010005747A (ko) | 2001-01-15 |
ES2163263T3 (es) | 2002-01-16 |
CN1220800C (zh) | 2005-09-28 |
DE69801987D1 (de) | 2001-11-15 |
AU6572698A (en) | 1998-10-20 |
JP2001518238A (ja) | 2001-10-09 |
EP0970267A1 (en) | 2000-01-12 |
US6217662B1 (en) | 2001-04-17 |
ATE206774T1 (de) | 2001-10-15 |
EP0970267B1 (en) | 2001-10-10 |
US20010009141A1 (en) | 2001-07-26 |
US20080257262A1 (en) | 2008-10-23 |
US6530990B2 (en) | 2003-03-11 |
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