CN1238891C - 新型芯片互连件以及封装沉积方法与结构 - Google Patents
新型芯片互连件以及封装沉积方法与结构 Download PDFInfo
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- CN1238891C CN1238891C CNB008189013A CN00818901A CN1238891C CN 1238891 C CN1238891 C CN 1238891C CN B008189013 A CNB008189013 A CN B008189013A CN 00818901 A CN00818901 A CN 00818901A CN 1238891 C CN1238891 C CN 1238891C
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Abstract
本发明涉及一种方法,它用于制造高性能的芯片互连件及包装件,它通过提供下述方法,以更为有效率且节省时间的方式,把导电材料沉积在基片孔穴中。它的实现,在于选择性地从基片顶部表面上去除种晶层的一些部分,且接着把导电材料沉积在基片孔穴中,在该孔穴中余留着种晶层的一些部分。另一种方法则包括,在基片顶部表面上形成氧化层,使得导电材料不形成于基片顶部表面上地沉积在孔穴中。本发明还公开了形成多层级互连件以及对应结构的方法。
Description
发明领域
本发明涉及制造高性能芯片互连件及封装件的方法。本发明尤其是涉及一种方法,它用来在现场选择性地从基片上去除种晶层(seedlayer)的一部分,同时,防止从种晶层所形成的孔穴中去除该种晶层。另外,本发明还公开了用于在基片的孔穴中沉积导电材料的方法。
背景技术
在基片或工件的孔穴(管沟、孔洞,以及通孔)中沉积金属/导电材料,在半导电和非半导电工业中具有重要而广泛的用途。例如,EP0 933 812A,US 5,723,387A,US 5,951,619A,EP 0881 673A等现有技术文件中公开了本发明的背景技术。导电材料被沉积在基片的孔穴中,以便互连各层与其中包含的各个部件。近来,人们很有兴趣以很高的纵横比和亚微米级别(例如低于0.25um)的部件来制造芯片和装置。结果,铜就成了人们喜爱选用的导电材料,因为它比起铝或铝合金来,提供了更好的导电性和可靠性。
图1A至1C显示一种常规方法。它用于把导电材料沉积在基片(例如工件)的孔穴中。图1A显示基片的剖视图,该基片上安置了不同的几个层。该图纸显示了二氧化硅(SiO2)层2(绝缘体层),该层上沉积了屏障层或粘着层4以及种晶层6。
在屏障层4和种晶层6沉积到绝缘体层2上之前,该层上一般都蚀刻了孔穴。绝缘体层2上的孔穴,一般是用反应离子蚀刻(RIE)方法蚀刻的。屏障层4可以是钽(Ta)、钛(Ti)、钨(W)、钛钨合金(TiW)、氮化钛(TiN)、铌、铜钨磷合金(CuWP)、钴钨磷合金(CoWP),或其他材料,或者该领域中通常所用的它们的化合物。屏障层4一般是用各种各样的喷溅法中的任何一种、化学气相沉积法(CVD)、电解沉积法/化学镀,沉积在绝缘体层2上的。随后,种晶层6就被沉积在屏障层4上。种晶层6也可以用各种各样的喷溅法、化学气相沉积法(CVD),或化学镀沉积法,或者它们的合成法,沉积在屏障层4上。沉积在基片表面上的种晶层6的厚度,可以为20至4000A°。
当种晶层6沉积之后,一般就用导电材料(例如铜)来填充绝缘体层2的孔穴,如图1B所示。导电材料8可以是用化学气相沉积法、喷溅法、化学镀法、电解沉积法,或者它们的合成法,形成于种晶层6上。导电材料8和种晶层6一般是用同样的材料。孔穴通常如图示那样用导电材料8填充得溢出。
一旦导电材料8在基片的孔穴中形成,基片通常就如图1C所示那样,被输送给另一个设备,以便抛光/磨平基片的顶部表面。通常而言,基片被用常规的化学机械抛光(CMP)装置磨平。基片顶部表面上的那部分种晶层6及屏障层4,也被抛光,以便与各种各样的结构电绝缘。孔穴中余留的种晶层6,则如图1C所示,被包含在导电材料8中。
返回参看图1A至1B,绝缘体层2中的孔穴的深度9c,范围可从用于互连件的0.2至5um,大到用于包装件的50um或更大。当把导电材料8沉积在基片上时,合乎要求的是要把孔穴填充得溢出,例如溢出深度9c的50%至200%,以便使布线结构中的缺陷最少。例如,就图1A中的结构而言,设想深度9a约为0.5um,而宽度9b约为10.0um。因此,较大的孔穴包括10.0um的宽度9b,且总深度约为1.0um(从孔穴的底部量到基片的顶部)。为了完全填充较大的孔穴,最小深度至少为1.0的导电材料8,必须沉积在其中。另外,额外数量的导电材料8在较大的孔穴中填充得溢出,确保孔穴被填满,且使布线缺陷最少。因此,较大孔穴上的额外数量(即50%)的导电材料8,应当是在深度9c处为至少0.5um。在此种情况下,当深度9e约为0.5um时,在场效应区域上形成的导电材料8,在深度9d处约是1.5um。换句话说,至少1.5um的导电材料8的覆盖层,会沉积在基片的大多数场效应区域上,而至少为0.5um的较小覆盖层则会沉积在较大的孔穴上。因此,0.5至1.5um的覆盖层,会沉积在基片的各种各样的部件上。
横跨基片的不等的导电材料8的覆盖层,导致使用化学机械方法处理时花费较长的抛光时间与较高的成本。因此,就需要使沉积处理让横跨基片的导电材料8覆盖层的数量最小,也要使基片表面上的不等的覆盖层深度最小。
图2A至2F显示了另一种把导电材料沉积在基片孔穴中的常规方法。图2A显示绝缘体(SiO2)层2,该层是以孔穴蚀刻的,并有屏障层4和种晶层6沉积在它上面,相似于图1A所示的结构。而且,绝缘体层2中的孔穴,通常是用反应离子蚀刻方法蚀刻的。
图2B显示涂覆在种晶层6顶部上的光致抗蚀材料12。使用正光致抗蚀处理法,使用一个掩模(未显示),使紫外线仅仅施于形成于基片孔穴中的光致抗蚀材料12上。当紫外线破坏光致抗蚀剂的分子结构时,暴露于紫外线的光致抗蚀剂(孔穴中的光致抗蚀剂)被裂解。然后,用适当的溶液或反应离子蚀刻法,把裂解了的光致抗蚀剂从基片的孔穴中去除,使结构如图2C所示那样。虽然这里说明的是正光敏处理法,但也可采用负光致抗蚀处理法来形成图2C所示结构。
对于具有大的孔穴例如宽度大于2um的基片来说,从孔穴中去除光致抗蚀剂,可能要求额外的步骤。例如,孔穴中的光致抗蚀材料12,可能与种晶层6互相作用,从而,使用溶液去除光致抗蚀材料12可能是不精确的。在此种情况下,在施用溶液使光致抗蚀剂溶解之后,基片就暴露在氧等离子体下了,以便从基片的孔穴中的种晶层6中灰化掉/剥离掉余留的光致抗蚀材料12。
当把铜的种晶层暴露在氧等离子体下时,铜的氧化物、铜的硫化物,或者铜的氧化物-硫化物就可以在铜的种晶上形成,尤其是当光致抗蚀材料中包含了载硫成分时更是如此。这些在铜的种晶层上形成的化合物,一般是抵抗导电材料的,且应当在任何导电材料在种晶层上沉积之前,把它们去除。因此,可能就要求用第二种剥离方法来去除氧化物、硫化物或者氧化硫。
在许多具有亚微型部件的布线结构中,孔穴中的铜种晶层可以沉积得厚度为15至1000A°。在其他情况下,尤其是当部件的尺寸低于0.5um且纵横比大于1.5时,孔穴中的铜种晶层可能很薄,甚至不连续。在这种情况下,在孔穴中的不连续种晶层上施加光致抗蚀材料可能导致部分的种晶层被光致抗蚀材料所消耗,从而导致基片有大量的缺陷。在图2D中,以适当的电镀或化学镀溶液把导电材料8(即铜)沉积在孔穴中,同时,余下的光致抗蚀剂12防止导电材料8在基片的顶部表面上形成。当导电材料8在孔穴中沉积之后,就用合适的溶液或反应离子蚀刻法去除整个光致抗蚀剂,于是形成图2E所示结构。随后,基片顶部表面上的那部分种晶层6及屏障层4,就被用常规的方法(例如化学机械抛光法、反应离子蚀刻法,或者它们的合成法)来蚀刻或抛光,于是形成图2F所示结构。
使用可替换的常规方法,如图2B所示基片顶部表面上的光致抗蚀材料12及种晶层6,就可以用化学机械抛光设备和磨粉浆去除掉。使用这种方法,有些磨料颗粒会陷在孔穴中,使磨粉浆机械附着在孔穴的侧壁上。当磨粉浆机械地附着在孔穴侧壁上时,它们常常难以去除,从而导致当导电材料沉积在孔穴中时基片会有各种各样的缺陷。
上述用于制造芯片互连件及包装件的各种常规方法,都要求有多个步骤和/或设备。在制造过程的这种阶段所需的时间与努力,能被改进与简化。相应地,就需要有些方法,能以更为有效率且更为有效果的方式,把导电材料沉积在基片的孔穴中。本发明就是为了克服现有技术所用各种方法的这些及其他缺点的。
发明内容
本发明的目的是提供一种方法,它用于把种晶层从基片顶部表面去除,同时又防止或最少地去除基片孔穴中的种晶层。
本发明的另一个目的是提供一种方法,它用于在有选择地从基片顶部表面去除种晶层之后,把导电材料沉积在基片孔穴中。
本发明的又一个目的是提供一种方法,它用于使用衬垫型材料去除基片顶部表面上的种晶层,同时又防止从基片孔穴中去除种晶层。
本发明还有一个目的是提供一种方法,它用于从基片顶部表面上去除种晶层,同时又把导电材料沉积在基片孔穴中。
本发明还有一个目的是提供一种方法,它用于使横跨基片上的导电材料覆盖层减少或最小化,同时又把导电材料沉积在基片孔穴中。
本发明还有一个目的是提供一种方法,它用于使横跨基片上的不等的导电材料覆盖层最小化,同时又把导电材料沉积在基片孔穴中。
本发明还有一个目的是提供一种方法,它用于形成多层结构,该结构具有覆盖着导电材料的孔穴。
本发明还有一个目的是提供一种方法,它用于在基片顶部表面上形成一个氧化层之后,把导电材料沉积在基片孔穴中。
按照本发明的第一方面,提供一种用于把导电材料沉积在基片孔穴中的方法,该基片上形成了屏障层和种晶层,该方法包括下列步骤:通过在基片和阳极之间施加电势,用连接于阳极的衬垫材料从基片顶部表面上去除种晶层的某些部分,同时防止从基片孔穴中去除其他一些部分的种晶层;在去除种晶层的某些部分之后,暴露基片顶部表面上的某些部分的屏障层;以及在基片和阳极之间施加电势,通过衬垫材料的开口把导电材料沉积在基片孔穴中的种晶层上面,其中基片是阴极。
按照本发明的第二方面,提供一种用于把导电材料沉积在基片孔穴中的方法,该基片上形成了屏障层和种晶层,该方法包括下列步骤:(1)用连接于阳极的衬垫材料选择性地从基片顶部表面上去除种晶层的一些部分,同时,在基片和阳极之间施加电势,通过衬垫材料的开口把第一导电材料施加在基片孔穴中的种晶层上,其中基片是阴极;(2)在选择性地去除种晶层的一些部分之后,暴露基片顶部表面上屏障层的一些部分;以及(3)把第二导电材料沉积在基片孔穴中。
按照本发明的第三方面,提供一种方法,它用导电材料在基片上形成均匀的覆盖导电层,该基片上形成了屏障层和种晶层,该方法包括下列步骤:(1)把导电材料沉积在基片孔穴中,同时,用连接在阳极上的衬垫材料从场效应区域中抛光导电材料,其中衬垫材料具有开口,在基片和阳极之间施加电势,导电材料是通过衬垫材料的开口沉积在基片孔穴中的,其中的沉积比率与抛光比率相同;(2)当孔穴中完全填充了导电材料后,加大沉积比率,使其高于抛光比率,从而在基片上形成均匀的导电材料覆盖层。
本发明公开的各种方法,以更为有效率且更节省时间的方式,把导电材料沉积在基片孔穴中。
附图说明
本发明的这些及其他目的以及优点,从下述结合附图对本发明所做的推荐示范实施例中,就可以更为明白且便于理解,在这些附图中:
图1A至1C的横截剖视图,显示一种常规方法,它用于把导电材料沉积在基片孔穴中;
图2A至2F的横截剖视图,显示另一种常规方法,它用于把导电材料沉积在基片孔穴中;
图3A至3D的横截剖视图,显示符合本发明推荐实施例的各种方法,它们用于把导电材料沉积在基片孔穴中;
图4A至4E的横截剖视图,显示符合本发明推荐实施例的一种方法,它用于形成具有覆盖了导电材料的多层结构;
图5A至5F的横截剖视图,显示符合本发明推荐实施例的另一种方法,它用于形成具有覆盖了导电材料的多层结构;
图6A至6C的横截剖视图,显示符合本发明推荐实施例的又一种方法,它用于把导电材料沉积在基片孔穴中;
图7A至7C的横截剖视图,显示符合本发明推荐实施例的又一种方法,它用于在基片孔穴中形成绝缘材料;
图8A至8F的横截剖视图,显示符合本发明推荐实施例的又一种方法,它用于把导电材料沉积在基片孔穴中。
具体实施方式
现在,参照附图3至8,说明本发明的各个推荐实施例,其中,在各张附图中,同样的结构和材料,以同样的标号表示。本发明的各个发明者在此公开一些方法,它们用于把导电材料,最好是铜,沉积在基片孔穴中。本发明也能用于任何基片或工件,例如晶片、平坦面板、磁性薄膜磁头、集成电路、装置、芯片,以及包括铅锌焊接合金或者无铅焊接合金在内的包装基片。还有,此处所提供的特定处理参数,用意在于举例,而非限制。
图3A至3D的横截剖视图,显示符合本发明的各种方法,它们用于制造芯片互连件及包装件。换言之,图3A至3D公开的各种方法,用于把一种材料,最好是导电材料/溶液,例如铜,沉积在基片孔穴中。在另一个实施例中,导电材料可沉积在孔穴中,同时,又选择性地从基片顶部表面上去除种晶层。
图3A至3D所示的各种方法,包括使用一种器械,把导电材料沉积在基片孔穴中的步骤,该器械具有衬垫型材料附着在阳极上。此种设备,在1999年8月13日登记的、名为“Method and Apparatus forDepositing and Controlling the Texture of A Thin Film”(《用于沉积与控制薄膜质地的方法与器械》)的待定的美国专利系列第09/373681号中,有详细说明,该专利为本发明的代理人共同拥有,其内容在此也特地一并作为参考。
图3A显示了绝缘体或SiO2层2,该层上沉积了屏障层或粘着层4以及种晶层6,情况相似于前面参照图1A与2A所说明的。而且,在屏障层4及种晶层6沉积在其上面之前,SiO2层2的顶部表面就被模制/蚀刻了孔穴。虽然此处所呈现的SiO2用作了绝缘体层2,但要明白,通常用作绝缘体层的其他材料,也可以按照本发明来使用。
在图3Bi中,带有或不带有磨料颗粒(未显示)的多孔衬垫型材料20,被用于有选择地从基片顶部表面(场效应区域)抛光种晶层6。附着在阳极22上的衬垫型材料20,可以按圆形运动而被转动,并被振动、从一侧到一侧地被移动,或被竖直移动,以及移动得与种晶层6相接触。衬垫型材料20和阳极22还包括出口通道21,该通道把导电材料/溶液引向基片。在推荐实施例中,在选择性地去除种晶层6的期间,阳极22、衬垫型材料20以及基片,可以转动50至2000rpm(转/分钟),但最好是转动100至1200rpm。当此种操作发生了2至60秒时,但最好是发生了5至25秒时,基片顶部表面上的种晶层6就被抛光。
当进行此种接触时,衬垫型材料20抛光余留在基片顶部表面上的种晶层6,而又不去除孔穴中的种晶层6。在这种去除步骤期间,衬垫型材料20在范围可为0.05至5psi(磅/平方英寸)的压力下,与种晶层6相接触。另外,包含了例如铜的导电溶液,可以从衬垫型材料20的出口通道21中发散出来,且可以0.01至5gpm(加仑/分钟)的量,但最好为0.1至5gpm的量被施加于基片上。当电动势施加于阳极22与导电基片之间时,少量的导电薄膜14可以沉积在基片孔穴之内,同时,衬垫型材料20就选择性地从基片顶部表面上去除种晶层6以及导电溶液。在阳极22与导电基片之间施加电动势并产生电流的目的,是为了在抛光基片顶部表面期间,避免孔穴中的种晶层6溶解。在执行此步骤期间,能以圆形运动转动,并从一侧向另一侧移动或竖直移动的基片支架(未显示),指导基片正确定位/移动。
在一个可替换实施例中,导电(保护性的或牺牲性的)薄膜14可以在电解溶液中再溶解,以便在从场效应区域中去除导电薄膜的同时且在导电材料沉积在基片孔穴中之前,即刻保护原本的种晶层6。当从场效应区域中去除种晶层6之后,可以使电极短时期(即2至10秒)去能,以便电解溶液溶解保护性的或牺牲性的薄膜14。另外,可以使基片即刻为阳极的,以促进从场效应区域去除种晶层的过程。
在选择性地从基片顶部表面上去除种晶层6的过程中,0.05至15mA/cm2(毫安/平方厘米)的、但最好为0.05至10mA/cm2的电流密度,被施加于基片。此种电流密度范围用以防止种晶层6在孔穴中溶解,并可使少量的导电薄膜14沉积在该种晶层上,如上文所述那样。请注意,重要的是,在此过程中,基片顶部表面上的种晶层6被去除,而孔穴中的种晶层6却余留着。余留在基片孔穴中的种晶层6,可以使导电材料更为有效率且更有效果地沉积,因为该种晶层比起屏障层4来,对导电材料具有更低的阻抗。
当从基片顶部表面上去除种晶层6之后,沉积电流密度可以被增大得用导电材料8填充孔穴,于是形成如图3Ci所示结构。由于余留在孔穴中的种晶层6所具有的阻抗小于基片顶部表面上的屏障层4,导电材料8就能沉积在基片孔穴中。结果,导电材料8沉积在孔穴中的种晶层6上,比沉积在基片顶部上的屏障层4上,更为有效率。换言之,导电材料8往往在基片孔穴中而非基片表面上的屏障层4上形成。导电薄膜14及余留在孔穴中的种晶层6,被包含在导电材料8中。
导电材料8能被使用阳极22和衬垫型材料20经由出口通道21而沉积在孔穴中。当从基片顶部表面上抛光种晶层6之后,衬垫型材料20就能被定位得与基片顶部表面的间隔在1微米至2毫米之间。电流密度能被增大得使阳极22和基片在5至250mA/cm2之间,但最好是在7至150mA/cm2之间,以便把导电材料8沉积在孔穴中。增大电流密度可使导电材料8以适时的方式填充基片孔穴。导电屏障层4被用于引导沉积电流。可替换的是,导电材料8能被沉积在孔穴中,同时,衬垫型材料20正与基片顶部表面相接触。
在一个备选实施例中,当选择性地去除而非电解沉积种晶层6之后,如上所述,孔穴被用化学镀或选择性的金属化学气相沉积法而填充。在此种情况下,基片被传送给化学镀电镀槽,且导电材料相应地被沉积。
返回参看图3Ci,当导电材料8沉积在孔穴中之后,就可用常规的抛光法或反应离子蚀刻法来去除屏障层4。当选择性地去除屏障层4并磨平/抛光基片顶部表面后,就形成图3D所示结构。
在一个备选实施例中,并非如图3Ci那样沉积导电材料8,而是可以增加用于沉积导电材料的沉积时间,于是就形成如图3Ciia所示结构。图3Ciia显示的包装结构,具有导电材料16沉积在孔穴中。在包装用途中,可采用电解沉积法、蒸馏法,或者其他已知的方法,把铅锌焊接合金或其他可焊接合金16沉积在孔穴中。在沉积步骤之后,就用反应离子蚀刻法去除部分的屏障层4,以导电材料16作为掩模,形成图3Ciib所示那样的结构。
在本发明的又一个实施例中,在形成图3A所示那样的结构之后,不同的导电材料层就能被沉积在基片孔穴中。
例如,图3Biia至3Biid显示了一种方法,它用于把一种或多种导电材料沉积在基片孔穴中。在图3Biia中,使用阳极22和衬垫型材料20(见图3Bi),就使第一导电材料24在5至35mA/cm2的电流密度下,以高流平的电镀溶液,沉积在基片上达一段时间例如15至60秒,以便部分地填充在孔穴中。可替换的是,也可用化学镀法或化学气相沉积法部分地填充孔穴。
第一导电材料24一般被填充得达到基片上最宽孔穴的深度的10%至60%。种晶层6被包含在第一导电材料24中。当第一导电材料24沉积在基片上之后,基片顶部表面可以被磨平/抛光,产生如图3Biib所示结构。基片顶部表面可以用衬垫型材料20磨平。
可替换的是,基片能被传送给化学机械抛光元件,以便抛光基片顶部表面。具有固定的磨料颗粒的化学机械抛光衬垫,以及施于它的抛光溶液,被用来抛光/摩擦基片3至60秒的时间,但最好是5至30秒。请注意,重要的是,在此过程中,屏障层4保留在基片上,且不被抛光。
当抛光第一导电材料24的覆盖层之后,第二导电材料26被沉积在第一导电材料24之上的孔穴中,如图3Biic所示。第二导电材料26的沉积,可以用阳极22和衬垫型材料20来执行,或可替换为在另一个沉积池中,用化学镀方法或化学气相沉积法来执行。例如,第一导电材料24可以用电解沉积法来沉积在基片上,而第二导电材料26则可以用化学镀法或化学气相沉积法来沉积。当第二导电材料26沉积在第一导电材料24上之后,就可用化学机械抛光法或反应离子蚀刻法来磨平/抛光第二导电材料26,以形成如图3Biid所示结构。
以上参照图3Biia至3Biid所说明的过程,显示了一些步骤的结合用法,该用法可被执行得以各种各样的导电材料填充孔穴。在另一个实施例中,可以执行下述按先后顺序的各个步骤:(1)部分地把第一导电材料沉积在孔穴和场效应区域中;(2)从场效应区域抛光第一导电材料;(3)使基片退火;(4)选择性地把第二导电材料沉积在孔穴中;以及(5)抛光/磨平基片。可替换的是,可以采用下列顺序的各个步骤来沉积导电材料:(1)部分地把第一导电材料沉积在孔穴和场效应区域中;(2)使基片退火;(3)从场效应区域抛光第一导电材料;(4)选择性地把第二导电材料沉积在孔穴中;以及(5)抛光/磨平基片。以上各个步骤的结合用法,在本发明中也可实行。
更详细地说,第一与第二导电材料24、26,可以是同样的或不同的材料。例如,第一导电材料可以是铜,而第二导电材料可以是铜锡合金、铜铟合金,或者其他适当的铜合金。最好第二导电材料26应当是强化抗腐蚀性并强化电磁性的,同时,它又具备优良的粘着性,便于粘着在第一导电材料24上,且粘着在其他随后沉积了的材料上,而该材料可以在它上面形成。另外,第二导电材料26可以具有类似于第一导电材料24的电阻抗,最好为第一导电材料24电阻抗的90%至200%。
当第一与第二导电材料24、26是同一种材料时,它们之间明显的边界就不存在了。另一方面,当第一与第二导电材料24、26不相同时,在执行随后的任何热处理之前,它们之间有明显的边界。明显的边界层可以用得使第一与第二导电材料24、26之间的混杂受阻碍。例如,薄的粘着层或屏障层(例如α钽、铬层、铜、铜磷合金、钨铜磷合金),就可沉积在第一与第二导电材料24、26之间,以便不希望这两种材料混杂时,防止这样的混杂。在另外的实施例中,可以用此处所说明的过程,在基片孔穴中形成两种以上导电材料。
返回参看图3A至3D所示各个方法,发明者们现在要公开一种新型的导电溶液(即导电材料8、16、24、26),它适合用于电解沉积孔穴中的铜材料,同时从基片顶部表面上抛光该铜材料。使用这种溶液,导电材料例如铜就能沉积在基片孔穴中,同时,同样的材料被从基片的场效应区域中抛光。该导电溶液,它可以是酸或碱,包括至少下列元素/化合物/来源:(1)金属离子的来源;(2)载流子源;3)氯离子源;(4)高流平的电解液添加剂的来源;(5)金属氧化剂;(6)钝化剂;以及(7)表面活化剂。
首先,本发明的导电溶液,包括例如从硫酸盐、硝酸盐、焦磷酸盐的来源浓缩的金属离子(例如铜)。该金属离子的浓度范围是1/2至40g/L(克/升),但最好是2至25g/L。
其次,导电溶液包括除了铜离子之外的载流子的来源,该来源可以包括有机/无机酸,以及例如硫酸、磷酸、醋酸、己酸、丙酸、丁酸、硫酸铵、氢氧化钾、四甲基、氢氧化铵以及类似物。酸浓度的范围,按体积计量为0.05%至18%,但最好按体积计量为0.2%至15%。
对于酸性电解液来说,出于氯离子的第三种来源,无论是有机的或无机的,皆包括在本发明的导电溶液中。氯离子的浓度应当为2至180ppm,但最好为10至170ppm。对于硷性电解液来说,可以采用铵,约为0.5至3ml/L(毫升/升)。
导电材料中的第四种元素,是来源于高流平的电解液添加剂,以及它们的化合物。这些添加剂包括售卖的添加剂,例如Cubath MD、Cubath ML,以及Ethone-OML所产的Cubath SC补充物,和/或Ultra的填充添加剂A2001以及Shipley所产的S2001。其他可用的添加剂还有,例如Technic,Inc.所产的铜晶片添加剂200B和200C,各种各样的巯基化合物如2巯基乙烷磺酸或盐、2-巯基苯并噻唑、2-巯基-5-苯并咪唑磺酸或盐,2-巯基苯并咪唑,巯基苯并三唑、酒石酸或酒石酸盐。添加剂浓度应当为按体积计量的0.01%至4%,但最好为0.05%至3%。对于硷性电解液来说,可以用Alchem公司(AlchemCorporation)制造的Kupralume501和502添加剂。
导电材料的第五种元素/化合物,包括金属氧化剂,例如有机的及无机的氧化剂。这些制剂可以包括无机的和有机的过氧化物、过硫酸盐、硝酸盐、亚硝酸盐、硫代硫酸盐、硝基苯磺酸盐,以及类似物体。从这个例子来看,重要的是氧化剂的任何成分,都不要有害地影响沉积了的材料。还可以使用有机过氧化物,例如butopronoxyl、叔丁基氢过氧化物、叔丁基过氧化物、亚硝酸异丁酯,等等。过氧化物(例如双氧水)可以用少量的苯磺酸盐(phenol sulfornate)或伯醇(即1,4-丁二醇)来使其稳定。氧化剂的浓度可以为0.1至60g/L,但最好为0.2至40g/L。其他合适的氧化剂也可用于氧化还原作用。
导电材料的第六种元素/化合物,是一种制剂,它使铜或其他金属材料钝化或增强它们的钝化。这些制剂可以包括苯并三唑,或苯并三唑与有机三唑的合成物,例如苯并三唑-1-乙腈、苯并三唑-5-羧酸、0-苯并三唑-l-基-N、N′、N′-双(四亚甲基)脲鎓六氟磷酸盐,以及它们的合成物。钝化剂的浓度应当为0.0005M至0.1M,但最好为0.001M至0.2M。另外,上述高流平的添加剂及对应的抑制剂,可以被用作钝化剂。从这个例子来看,重要之处在于,对于化学机械抛光方法来说,钝化剂的浓度是足够的,且低于使导电材料沉积所用的临阈级。高于此临阈级,就是氢而不是导电材料,能在阴极上沉积了。
除了钝化剂之外,表面活性剂例如Duponol(Dupont Chem.)也可以使用,其中,表面活性剂的浓度为20至800ppm,但最好为40至600ppm。另外,一些戊糖例如木糖、树胶醛醣等等,也可按0.05至10克/升的浓度作为去氧剂(oxygen scavenging)添加到被沉积的导电材料中。水也可以用来平衡此处所说明的导电材料。
以上公开的此种导电溶液,可以使得在把所有或大多数沉积在基片场效应区域上的衬垫型材料去除的同时,把金属沉积在基片孔穴之内。此种用于磨平及抛光器械中的配方,使图1B所示大量的金属覆盖层被消除或变得最小了。
在其他用途中,导电材料的均匀覆盖层,通过控制图3A所示结构的沉积和抛光比率,就可变得合乎要求。例如,用衬垫型材料(即图3Bi中的衬垫20)以及用磨平和抛光的电解液配方,就可使导电材料8的沉积和去除比率为10mA/cm2。因此,导电材料8就开始填充基片孔穴,同时,同样的材料被从场效应区域上抛光。当孔穴被填充了导电材料8时,沉积比率就微微增大得高于抛光比率,从而就能使导电材料的均匀覆盖层沉积在基片上。沉积和抛光比率,能通过改变电流密度、转动比率、转动周期等等,来加以调节。例如,对于沉积均匀的导电材料覆盖层来说,电流密度的范围在10至90秒的时间中,为5至30mA/cm2。
在略微高于10mA/cm2(例如10.5mA/cm2)的电流密度下进行沉积,在整个基片顶部表面上就会形成薄薄的连续的均匀覆盖层。覆盖层的深度,可以为0.1至10000mA/cm2,甚至更高,这要依据所要求的结构而定。因此,通过变动沉积比率和/或抛光比率,就可获得如图3Biii所示的任何均匀的导电材料8的覆盖层了。
可以理解,此处公开的各种方法,减少了处理步骤的数量,并简化了制造芯片互连件及包装件的过程。种晶层的一些部分,被选择性地从基片顶部表面上去除,同时,种晶层的另一些部分则余留在孔穴中。于是,就能把一种或几种导电材料沉积在余留了种晶层的孔穴中。
如上所述,符合本发明的推荐方法,是选择性地在一个空腔/单元中去除种晶层并把导电材料沉积在孔穴中。然而,另一种方法是用化学机械抛光器械及单元,来首先去除种晶层,然后把基片输送给另一个不同的单元以便进行沉积。
在另一个实施例中,可以用化学镀把种晶层选择性地从基片顶部表面上去除。化学镀溶液可以在衬垫型材料中的通道之内发散,该材料紧挨着一个阳极和基片顶部表面。各个孔穴被选择性地用导电材料填充,同时,种晶层被具有磨料颗粒的衬垫型材料从基片顶部表面上去除。
在这些过程中的主要条件之一,是种晶层的去除比率约比孔穴中导电材料的沉积比率快约2至100倍。因此,在化学镀和电解沉积的情况下,当种晶层被从基片顶部表面上去除之后,基片就可被移动得离开衬垫型材料,在那儿执行沉积过程,或可替代的是,在使基片顶部表面与衬垫型材料保持实际接触的同时,进行沉积。
在其他实施例中,种晶层从基片顶部表面上的去除比率,可以与导电材料在基片孔穴中的沉积比率相同。在这种情况下,在把顶部表面上的种晶层去除的同时,就可把导电材料沉积在孔穴中。
在又一个实施例中,在选择性地从基片顶部表面上去除种晶层的同时,可以把初始的合金层沉积在基片孔穴中。例如,在选择性地从基片顶部表面上去除种晶层的初始阶段(见图3B),可以把电解溶液例如合金材料沉积在孔穴中的种晶层上,以形成初始的薄的合金层。在导电材料为铜的情况下,就可采用含有铟、镉、锡的薄合金膜,以及类似物。
当选择性地去除种晶层,并把薄的合金层(图3B中标号14所示)沉积在孔穴中之后,基片和/或阳极被去能,从而基片就可以被喷洗漂清。当漂清基片之后,基片中的孔穴,就可选择性地用适当的来源例如化学镀或电镀槽的铜来填充。
对于最适宜的互连件的性能来说,最好是通过使沉积了的铜退火来稳定结构。退火可以在室温下进行一天或更长的时间,或者在合适的炉子或管式炉中更快地退火15秒至2小时。退火温度可在60°至450℃的温度下在惰性环境中进行,例如在氮包围的即还原环境(reducing ambient)中进行,甚至在真空室中进行。
孔穴中的薄的合金层,被用于增强芯片互连件的机械、腐蚀以及电移性能。该合金层与孔穴中沉积了的导电材料相混杂,从而,一旦使基片退火,合金材料就会增强芯片互连件的结构性能。
图4A至4E的横截剖视图显示一种方法,该方法用于形成符合本发明推荐实施例的一种多层结构,该结构具有覆盖了的导电材料。如图3Ci所示被填充了的孔穴,可以用合适的屏障材料而选择性地盖住。例如,覆盖层32例如铜磷合金、镍磷合金、钨铜磷合金(CoP、NiP、WCoP),或者它们的组合,能使用已知方法而在铜材料8上形成,于是形成如图4A所示结构。覆盖层32防止导电材料氧化,起到屏障层的作用,并增强粘着性。
当覆盖层32在导电材料8的顶部上形成之后,形成于基片顶部表面上的屏障层4,就可如图4B所示,被用反应离子蚀刻法去除。当把屏障层4从基片顶部表面上去除后,第一绝缘体材料2的一些部分,也可用反应离子蚀刻法去除,于是形成图4C所示结构。例如,在第一绝缘体材料为二氧化硅(SiO2)的情况下,孔穴的深度可以为0.3至2.5um。所去除的第一绝缘体材料2的量,可以为孔穴深度的10%至20%,但最好在30%至95%之间。有足够的绝缘体材料2余留下来,以便支承几乎是不附属的孔穴。
接着,就可以用化学气相沉积法或旋转法(spin-on process),把第二绝缘体材料30沉积在图4C所示基片上,以形成图4D所示结构。第二绝缘体材料30于是被磨平/蚀刻,以便暴露出覆盖层32,如图4Ei所示那样。第二绝缘体材料30可以是低的或高的绝缘体材料。
在本发明的另一个实施例中,如图4D所示的第二绝缘体材料30,可以用平版印刷法成型。于是就能用反应离子蚀刻法把绝缘体材料30蚀刻成另外的一些孔穴。当屏障层和种晶层沉积在第二绝缘体材料30上之后,种晶层又被从第二绝缘体材料30的顶部表面上去除,且第二导电材料28被沉积在第二绝缘体材料30的孔穴中,于是形成如图4Eii所示结构。
图5A至5F的横截剖视图,显示了另一种方法,它用于形成符合本发明推荐实施例的多层结构。以化学气相沉积法、化学镀法或电解沉积法进行的透过掩模(through-mask)沉积法,可用来把第二导电材料沉积在第一导电材料上面。图5A显示了图3D所示结构。
图5B显示了光阻材料50,它被涂覆在了基片上,其中,光阻材料50的一些部分被去除得使第二导电材料可以被沉积在第一导电材料上面。第二导电材料58就沉积在如图5C所示的去除了那部分光阻材料50之处。第一与第二导电层,可以是同样的或不同的材料的。光阻材料50以及那部分屏障层4,被用常规方法去除,于是形成如图5D所示结构。第二导电材料58保持为不附属的。
接着,在把那部分屏障层4及第一绝缘体层2去除之前,用化学镀沉积法选择性地覆盖第二导电材料58。在此情况下,那部分屏障层4可以如上文所述那样,连同那部分绝缘体层2一起去除,以便形成如图5E所示结构。覆盖层60以低的或高的绝缘体材料涂覆如图5E所示那个新结构。然后,第二绝缘体层70就可以形成并被磨平,以形成图5F所示结构。
图6A至6C显示了另一种方法,它用于把导电材料沉积在基片孔穴中,但不把同样的材料沉积在基片顶部表面上。这仅仅使基片顶部表面隔离就办到了。例如,图6A所示结构,显示了沉积在屏障层4上面的二氧化硅层2。屏障层4可以是众所周知的材料,例如钽、钨,或者上文所述的氮化钽(TaN)。这些材料是用以形成均匀的表面氧化层的已知材料,它们可用阳极化电镀法电解形成。
使用阳极化电镀技术,把添加的材料蘸于电解溶液中,并对该材料施以与阴极有关的正电压,该阴极也与电解溶液相接触。表面氧化层在阳极化了的材料上形成,且表面氧化层的厚度依电解溶液以及所施电压的性质而定。一般来说,较高的阳极化电压会导致较厚的表面氧化层薄膜。在图6B中,阳极化之后,薄薄的氧化层66仅在基片顶部表面上的屏障层4上面形成。一旦薄薄的氧化层66形成了,就可以用导电材料例如铜来电镀而填充在孔穴中,而不让导电材料在氧化层66上形成,从而形成如图6C所示结构。由于氧化层66对导电材料有很高的阻抗,就形成了图6C所示结构,且因此导电材料就在基片孔穴中形成。
返回参看图6B,阳极化应当执行得使某种可评估的屏障层4直接余留在氧化层66下面。这是重要的一点,因为如果所有顶部表面上的屏障层4都被氧化了,那么,把导电材料68电镀进孔穴中就不能进行,因为没有电流穿过完全氧化了的表面上的各层。
在另一个实施例中,薄薄的种晶层(未显示)可以在图6A所示结构中的屏障层4的上方形成。在此情况下,基片顶部表面上的种晶层在阳极化期间会被溶解,且屏障层4会氧化,从而形成氧化层66。种晶层的一些部分则余留在屏障层上方的孔穴中。
为了制造图6C所示结构,图6A所示孔穴就需要在阳极化期间电绝缘。否则阳极化就会影响整个基片,包括孔穴和顶部表面。可以各种方式来达到绝缘。例如,假如孔穴又窄又深,就可以使基片降低而进入阳极化的电解溶液中而使孔穴面朝下方。被吸陷在孔穴中的气体/空气能避免电解溶液进入孔穴中,并因此能起到绝缘器的作用。
可替换的是,在把基片顶部表面暴露在阳极化的电解溶液下之前,可以把绝缘材料填充在孔穴中。例如,图7A显示了一个其中装有电解溶液70的液体室74。在图7B中,绝缘溶液72,其重量比阳极化电解溶液70轻,且它未与电解溶液70混合,被放置在液体室74中的阳极化电解溶液70的顶上。在图7C中,液体室74被升高了,使得基片顶部表面(有孔穴开口末端的那一侧)首先与绝缘溶液72相接触。用这种技术,当液体室74升高时,孔穴首先就被绝缘溶液72所填充。当液体室74进一步升高时,基片的其余顶部表面(在孔穴外面的那一部分)就由于基片顶部表面与电解溶液70相接触而被阳极化了。所以,当在基片顶部表面上进行阳极化时,孔穴外面那部分屏障层4就会形成氧化层。孔穴中的绝缘溶液72则防止氧化层在孔穴中形成。
应当注意,图7A至7C所述的方法,也能用来从基片顶部表面上去除种晶层。在此情况下,在原本的基片上就会有屏障层和种晶层。阳极化电解溶液70,可以用蚀刻电解溶液来替代,后一种溶液会与基片顶部表面上的种晶层相接触,并会化学蚀刻种晶层。然而,孔穴内的种晶层会受到绝缘溶液72的保护。一旦顶部表面上的种晶层被蚀刻掉,就可从液体室中取走基片了。可从孔穴中去除绝缘溶液72,以便接着使导电材料能被沉积在基片孔穴中。
图8A至8F显示本发明的另一个实施例,它用于把导电材料沉积在基片孔穴中。图8A显示沉积在屏障层4和种晶层6上面的绝缘层2,这相似于图3A所示结构。
在图8B中,牺牲层或保护层84,例如它为铬(Cr)的,被以25至1000A°的厚度沉积在种晶层6上面。随后,由二氧化硅制成的硬的平滑层86,它与用紫外辐射处理过的环氧树脂交联,被涂覆在铬层84上,于是形成图8C所示结构。
在图8D中,基片顶部表面接着被用例如磨粉浆衬垫或溶液磨平,从而去除硬的平滑层86、铬层84以及处在场效应区域的种晶层6。基片孔穴中的硬的平滑层86被用例如稀释的氟化氢去除,于是形成图8E所示结构。孔穴内余留着的铬层,可用专业界所知的适当溶液剥离掉。随后,就通过电镀、化学镀,以及类似方法,把导电材料88沉积在基片孔穴中。
除了用铜及其合金作为导电材料之外,其他导电材料例如铝、铁、镍、铬、铟、铅、锡、铅锡合金、无铅可焊接合金、银、锌、镉、钛、钨、钼、钌、金、钯(paladium)、钴、铑(rhondium)、铂,它们相应的合金,以及上述材料与氧、氮、氢及硫的化合物,在本发明中均可采用。例如,第一导电材料由铬组成,第二导电材料由铜组成。
在以上说明中,对许多特定细节做了说明,例如特定的材料、结构、化学物品、过程等等,以便于彻底理解本发明。然而,普通的专业人员都明白,不凭借特地说明的细节,本发明也能实行。
虽然在上文中详细说明了各个推荐实施例,但专业人员都会明白,只要不在实质上背离本发明的新颖原理和优点,就可以对示范实施例,做许多改动。
Claims (19)
1.一种用于把导电材料沉积在基片孔穴中的方法,该基片上形成了屏障层和种晶层,该方法包括下列步骤:
通过在基片和阳极之间施加电势,用连接于阳极的衬垫材料从基片顶部表面上去除种晶层的某些部分,同时防止从基片孔穴中去除其他一些部分的种晶层;
在去除种晶层的某些部分之后,暴露基片顶部表面上的某些部分的屏障层;以及
在基片和阳极之间施加电势,通过衬垫材料的开口把导电材料沉积在基片孔穴中的种晶层上面,其中基片是阴极。
2.根据权利要求1所述的方法,其特征在于:从基片顶部表面上去除种晶层的某些部分的步骤包括用具有磨料颗粒的衬垫材料抛光某些部分的种晶层的步骤。
3.根据权利要求2所述的方法,其特征在于:抛光步骤包括顺着环形方向以每分钟50至2000转的速率转动衬垫材料或基片2至60秒。
4.根据权利要求2所述的方法,其特征在于:抛光步骤包括顺着环形方向以每分钟100至1200转的速率转动衬垫材料或基片5至25秒。
5.根据权利要求2所述的方法,其特征在于:抛光步骤包括以每平方英寸0.05至5磅的压力用衬垫材料与基片顶部表面上某些部分的种晶层相接触这个步骤。
6.根据权利要求1所述的方法,其特征在于:基片包括绝缘层。
7.根据权利要求6所述的方法,其特征在于:绝缘层包括二氧化硅层。
8.根据权利要求1所述的方法,其特征在于:导电材料包括铝、铁、镍、铬、铟、铅、锡、铅锡合金、无铅可焊接合金、银、锌、镉、钛、钨、钼、钌中的一种,及它们的组合。
9.一种用于把导电材料沉积在基片孔穴中的方法,该基片上形成了屏障层和种晶层,该方法包括下列步骤:
(1)用连接于阳极的衬垫材料选择性地从基片顶部表面上去除种晶层的一些部分,同时,在基片和阳极之间施加电势,通过衬垫材料的开口把第一导电材料施加在基片孔穴中的种晶层上,其中基片是阴极;
(2)在选择性地去除种晶层的一些部分之后,暴露基片顶部表面上屏障层的一些部分;以及
(3)把第二导电材料沉积在基片孔穴中。
10.根据权利要求9所述的方法,其特征在于,步骤(1)还包括下列步骤:
用连接在阳极上的衬垫材料抛光种晶层的一些部分;以及
在阳极与基片之间应用第一电流密度,以便使第一导电材料从衬垫材料流向基片孔穴。
11.根据权利要求10所述的方法,其特征在于:步骤(3)还包括这样的步骤,即在阳极与基片之间应用第二电流密度,以便使第二导电材料从衬垫材料流向基片孔穴。
12.根据权利要求11所述的方法,其特征在于:第一电流密度包括0.05至10mA/cm2。
13.根据权利要求11所述的方法,其特征在于:第一导电材料以每分钟0.1至5加仑的流率流动。
14.根据权利要求11所述的方法,其特征在于:第二电流密度包括5至250mA/cm2。
15.根据权利要求9所述的方法,其特征在于:第一导电材料与第二导电材料由同样材料组成。
16.根据权利要求9所述的方法,其特征在于:第一导电材料由铬组成,第二导电材料由铜组成。
17.一种方法,它用导电材料在基片上形成均匀的覆盖导电层,该基片上形成了屏障层和种晶层,该方法包括下列步骤:
(1)把导电材料沉积在基片孔穴中,同时,用连接在阳极上的衬垫材料从场效应区域中抛光导电材料,其中衬垫材料具有开口,在基片和阳极之间施加电势,导电材料是通过衬垫材料的开口沉积在基片孔穴中的,其中的沉积比率与抛光比率相同;
(2)当孔穴中完全填充了导电材料后,加大沉积比率,使其高于抛光比率,从而在基片上形成均匀的导电材料覆盖层。
18.根据权利要求17所述的方法,其特征在于:步骤(1)包括以10mA/cm2至10.5mA/cm2的电流密度把导电材料沉积在阳极与基片之间。
19.根据权利要求17所述的方法,其特征在于:均匀的导电材料覆盖层范围为0.1至10000。
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-
1999
- 1999-09-17 US US09/398,258 patent/US6355153B1/en not_active Expired - Lifetime
-
2000
- 2000-09-13 AU AU74841/00A patent/AU7484100A/en not_active Abandoned
- 2000-09-13 KR KR1020027003502A patent/KR100802128B1/ko active IP Right Grant
- 2000-09-13 EP EP00963426A patent/EP1218937A2/en not_active Withdrawn
- 2000-09-13 JP JP2001524131A patent/JP2003525523A/ja active Pending
- 2000-09-13 CN CNB008189013A patent/CN1238891C/zh not_active Expired - Fee Related
- 2000-09-13 WO PCT/US2000/025142 patent/WO2001020647A2/en not_active Application Discontinuation
- 2000-09-16 TW TW089119072A patent/TW464928B/zh not_active IP Right Cessation
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2001
- 2001-07-13 US US09/905,335 patent/US6905588B2/en not_active Expired - Fee Related
-
2003
- 2003-04-04 US US10/407,892 patent/US7147766B2/en not_active Expired - Lifetime
-
2005
- 2005-12-06 US US11/295,014 patent/US20060070885A1/en not_active Abandoned
Also Published As
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---|---|
EP1218937A2 (en) | 2002-07-03 |
KR100802128B1 (ko) | 2008-02-11 |
CN1433572A (zh) | 2003-07-30 |
TW464928B (en) | 2001-11-21 |
US7147766B2 (en) | 2006-12-12 |
US20060070885A1 (en) | 2006-04-06 |
JP2003525523A (ja) | 2003-08-26 |
US6355153B1 (en) | 2002-03-12 |
US20030164302A1 (en) | 2003-09-04 |
US20020033342A1 (en) | 2002-03-21 |
KR20020095159A (ko) | 2002-12-20 |
WO2001020647A3 (en) | 2002-01-17 |
AU7484100A (en) | 2001-04-17 |
WO2001020647A2 (en) | 2001-03-22 |
US6905588B2 (en) | 2005-06-14 |
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