CN103956334B - 集成电路中rdl和tsv金属层一次成型方法 - Google Patents

集成电路中rdl和tsv金属层一次成型方法 Download PDF

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CN103956334B
CN103956334B CN201410191832.6A CN201410191832A CN103956334B CN 103956334 B CN103956334 B CN 103956334B CN 201410191832 A CN201410191832 A CN 201410191832A CN 103956334 B CN103956334 B CN 103956334B
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CN103956334A (zh
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李恒甫
张文奇
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National Center for Advanced Packaging Co Ltd
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/70Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
    • H01L21/71Manufacture of specific parts of devices defined in group H01L21/70
    • H01L21/768Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
    • H01L21/76838Applying 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 conductors
    • H01L21/7684Smoothing; Planarisation
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/027Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
    • H01L21/0271Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
    • H01L21/0273Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers characterised by the treatment of photoresist layers
    • H01L21/0274Photolithographic processes
    • H01L21/0276Photolithographic processes using an anti-reflective coating
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/70Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
    • H01L21/71Manufacture of specific parts of devices defined in group H01L21/70
    • H01L21/768Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
    • H01L21/76838Applying 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 conductors
    • H01L21/76841Barrier, adhesion or liner layers
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/70Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
    • H01L21/71Manufacture of specific parts of devices defined in group H01L21/70
    • H01L21/768Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
    • H01L21/76838Applying 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 conductors
    • H01L21/76877Filling of holes, grooves or trenches, e.g. vias, with conductive material
    • H01L21/76879Filling of holes, grooves or trenches, e.g. vias, with conductive material by selective deposition of conductive material in the vias, e.g. selective C.V.D. on semiconductor material, plating

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Abstract

本发明公开了一种集成电路中RDL和TSV金属层一次成型方法,包括:TSV的光刻和蚀刻;TSV光刻胶的去除和清洗;TSV绝缘层氧化物沉积;TSV?BARC填充及刻蚀;RDL光刻和蚀刻;RDL光刻胶的去除和清洗;扩散阻挡层和种子层的沉积;金属导电物的填充以及表面平坦化处理的步骤。本发明能够同时实现TSV和第一层线转移层RDL制作过程中扩散阻挡层、种子层、金属填充物的同步完成以及一次性平坦化处理,不仅提高了材料的利用率,降低了生产成本,还提高了生产效率。

Description

集成电路中RDL和TSV金属层一次成型方法
技术领域
本发明涉及微电子技术领域,特别是一种集成电路中RDL和TSV金属层一次成型的工艺方法。
背景技术
随着集成电路工艺的发展,除了对器件本身提出的高速、低功耗、高可靠性的性能要求之外,互连技术的发展也在越来越大的程度上影响了器件的总体性能,减少RC延迟时间(其中R是互连金属的电阻,C是和介质相关的电容)、达到和器件延迟相当的水平是一个很大的挑战。而硅通孔技术(简称TSV技术)则可有效的降低RC延时,TSV技术是通过芯片与芯片、晶圆与晶圆的之间的垂直导通来实现芯片的互连,因而它成为先进的三维系统级封装(3DSIP)集成技术乃至三维集成电路(3DIC)集成技术的核心。
当前,TSV的填充过程一般包括氧化物、阻挡层、种子层的沉积和导电物质的填充,氧化物一般用二氧化硅、氮化硅或者TEOS,阻挡层一般用Ti、TiN、Ta或TaN,导电填充物以铜为主。
在TSV制作工艺中,氧化物的沉积可在种子层形成绝缘膜,用于防止后形成的导电材料(如铜)扩散入衬底造成互连材料铜和硅基底之间形成导电通道现象的发生。
但是,由于铜在硅或其他介质中都有较好的电子迁移率,一旦铜原子进入硅器件,便会成为深能级受主杂质,从而产生复合中心使载流子寿命降低,质的介电性能严重退化,最终导致器件性能退化甚至失效。另外铜和介质的粘附性能较弱,也较易受到腐蚀。为了避免铜互连电路中的合金化,阻止填充金属(如铜)向绝缘层扩散,在种子层和绝缘膜之间必须加入一扩散阻挡层,从而提高芯片的电学可靠性和稳定性。
大多数情况下绝缘膜采用SiO2层,SiO2的形成一般采用PECVD技术。扩散阻挡层一般选择Ti、Ta及他们的氮化物等材料,可以采用溅射、PVD、ALD等方法生长。
通常,TSV及RDL正面的工艺制作方法一般有两种方法:一种是大马士革工艺,另一种RDL的制作方法是semi-additive工艺。这两种传统的TSV和RDL制作工艺,TSV和RDL需要独自的阻挡层沉积,金属导电物填充,降低了材料的利用率,增加了制造成本;工艺步骤繁琐,容易产生问题,也不利于问题的查找。
发明内容
本发明解决的技术问题是提供一种工艺简单的集成电路中RDL和TSV金属层能够一次成型方法。
为解决上述技术问题,本发明所采取的技术方案如下。
集成电路中RDL和TSV金属层一次成型方法,主要包括以下步骤:
步骤一:TSV的光刻和蚀刻;
步骤二:TSV光刻胶的去除和清洗;
步骤三:TSV绝缘层氧化物沉积;
步骤四:TSVBARC填充及刻蚀;
步骤五:RDL光刻和蚀刻;
步骤六:RDL光刻胶的去除和清洗;
步骤七:扩散阻挡层和种子层的沉积;
步骤八:金属导电物的填充;
步骤九:表面平坦化处理。
由于采用了以上技术方案,本发明所取得技术进步如下。
本发明引入了BARC物质,与氧化层比较,由于BARC的存在,RDL刻蚀时,TSV不会被刻蚀影响,很好了保护了TSV的性能,因此对等离子体来说具有较高的选择比。采用本发明所述的工艺与传统的TSV和RDL制作工艺方法相比,工艺步骤减少近30%,同时实现了TSV和第一层线转移层RDL制作过程中扩散阻挡层、种子层、金属填充物的同步完成,实现了TSV和第一层RDL一次性平坦化处理,不仅提高了材料的利用率,降低了生产成本,还提高了生产效率。
附图说明
图1为本发明步骤三完成后形成的产品结构示意图。
图2为本发明步骤四完成后形成的产品结构示意图。
图3为本发明步骤五完成后形成的产品结构示意图。
图4为本发明步骤五完成后形成的产品结构示意图。
图5为本发明步骤八完成后形成的产品结构示意图。
图6为本发明步骤九完成后形成的产品结构示意图。
具体实施方式
下面将结合附图和具体实施例对本发明进行进一步详细说明。
集成电路中RDL和TSV金属层一次成型方法,主要包括以下步骤:
步骤一:TSV的光刻和蚀刻:在硅衬底100上通过光刻和干蚀刻工艺,形成TSV硅通孔201。
步骤二:TSV光刻胶的去除和清洗:去除硅衬底上硅通孔TSV中的光刻胶,并进行清洗。
步骤三:TSV绝缘层氧化物沉积:在TSV硅通孔内采用PECVD方法沉积一层绝缘氧化层TEOS。此步骤完成后产品的结构如图1所示,图1中的301为TSV硅通孔内的绝缘氧化层,302为表面绝缘氧化层。
步骤四:TSVBARC填充及刻蚀:在TSV硅通孔内以及硅衬底上端面填充物质BRAC,在TSV硅通孔内的物质BRAC如图2中的401所示,在硅衬底上端面的物质BRAC如图2中的402所示。然后再对物质BRAC进行刻蚀,此步骤完成后的产品结构如图3所示。
此步骤中物质BRAC可以完全填充TSV硅通孔,也可以不完全填充,但是在填充过程中应保证物质BRAC在刻蚀之后,TSV硅通孔底部的绝缘氧化层不被刻蚀,即刻蚀完成后,TSV硅通孔底部应留有足够的物质BRAC。图3中的403即为表面BARC物质刻蚀之后TSV硅通孔内剩余的BARC。
本发明中的物质BARC是bottomanti-reflectioncoating的缩写,多为有机物,一般采用旋涂方式。
步骤五:RDL光刻和蚀刻:在步骤四所形成的产品上进行RDL光刻、干蚀刻形成正面第一层线转移层RDL。此步骤完成后形成的产品如图4所示,其中501为第一层线转移层RDL,502为与TSV硅通孔接触的第一层线转移层RDL。
步骤六:RDL光刻胶的去除和清洗:去除第一层线转移层RDL上的光刻胶,并进行清洗。清洗时,连同TSV硅通孔内剩余的物质BRAC一起清洗干净。
步骤七:扩散阻挡层和种子层的沉积:在第一层线转移层RDL上以及TSV硅通孔内进行扩散阻挡层以及种子层的沉积。扩散阻挡层的沉积方法有CVD、PVD、溅射、原子层沉积技术(ALD)等;扩散阻挡层沉积完成后,再在扩散阻挡层上沉积一层种子层,种子层的沉积方法有PVD,ALD等。
步骤八:金属导电物的填充:通过电镀等方法在种子层上填充导电金属,导电填充金属一般为铜,也可以是钨、多晶硅等其他材料。此步骤完成后的产品结构如图5所示,图5中601为第一层线转移层RDL内的扩散阻挡层,602为TSV硅通孔内的扩散阻挡层,603为表面扩散阻挡层;701为第一层线转移层RDL内的导电物质,702为TSV硅通孔内的导电物质,703为表面导电物质。
步骤九:最后采用CMP技术进行表面平坦化处理,即完成了TSV和RDL的一次成型制作。
采用上述步骤完成后的产品如图6所示。

Claims (1)

1.集成电路中RDL和TSV金属层一次成型方法,其特征在于主要包括以下步骤:
步骤一:TSV的光刻和蚀刻;
步骤二:TSV光刻胶的去除和清洗;
步骤三:TSV绝缘层氧化物沉积;
步骤四:TSVBARC填充及刻蚀掉一部分BARC;
步骤五:RDL光刻和蚀刻;
步骤六:RDL光刻胶的去除和清洗;
步骤七:扩散阻挡层和种子层的沉积;
步骤八:金属导电物的填充;
步骤九:表面平坦化处理。
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