CN1218371C - 一种无机抗反射层去除方法 - Google Patents

一种无机抗反射层去除方法 Download PDF

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CN1218371C
CN1218371C CN 02136119 CN02136119A CN1218371C CN 1218371 C CN1218371 C CN 1218371C CN 02136119 CN02136119 CN 02136119 CN 02136119 A CN02136119 A CN 02136119A CN 1218371 C CN1218371 C CN 1218371C
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sti
cmp
photoetching
hdp
silicon
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CN1391265A (zh
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肖慧敏
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Shanghai Huahong Group Co Ltd
Shanghai Integrated Circuit Research and Development Center Co Ltd
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Shanghai Huahong Group Co Ltd
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Abstract

在先进的半导体制造工艺中,无机抗反射层能有效降低衬底反射。但光刻完成后如何有效地去除这些无机抗反射层往往成为工艺难点。本发明通过反版刻蚀来去除无机抗反射层。其方法是在HDP淀积后增加一次STI反版光刻,通过干法刻蚀的方法去除有源区区域的HDP和氮氧化硅,使刻蚀终止在氮化硅上。本发明方法可使硅片表面平坦,缩短CMP时间,改善CMP均匀性,为STICMP提供良好的条件,解决了现有技术中光刻与CMP不能两全其美的问题。

Description

一种无机抗反射层去除方法
技术领域
本发明属于半导体制造工艺技术领域,具体涉及一种光刻无机抗反射层的去除方法。
背景技术
氮氧化硅作为光刻的无机抗反射层因能有效抑制衬底反射,改善条宽控制而受到光刻工艺的广泛欢迎。但当氮氧化硅应用于STI(Shallow Trench Isolation,浅槽隔离)光刻时,由于底下是氮化硅,不能在去胶后用磷酸湿法去除。现有方法是在STI(Shallow TrenchIsolation,浅槽隔离)HDP(High Density Plasma,高密度等离子体,一种化学汽相淀积方法,也指用这种方法生长的二氧化硅)后用CMP(Chemical Mechanical Polish,化学机械抛光)直接磨削,不但需要大幅度延长STI CMP的时间,也对STI CMP的均匀性和工艺窗口有负面影响,其结果是工艺成本提高,工艺控制变差,从而制约了氮氧化硅在STI光刻上的应用。
发明内容
本发明的目的是针对现有技术的不足,提出一种可缩短STI CMP时间,克服氮氧化硅对STI CMP影响的去除光刻无机抗反射层的方法。
为了实现上述目的,本发明采用的技术方案是,通过反版刻蚀去除无机抗反射层,例如氮氧化硅或碳化硅。其方法是:在HDP淀积(该步骤位于STI浅槽形成后)后增加一次STI反版光刻,通过干法刻蚀的方法去除有源区区域的HDP和氮氧化硅,使刻蚀终止于氮化硅上。
本发明提出的去除无机抗反射层的方法,其具体工艺流程如下:第一步:硅片氧化;第二步:氮化硅淀积;第三步:氮氧化硅淀积;第四步:STI光刻;第五步:STI刻蚀;第六步:去胶;第七步:氧化;第八步:HDP淀积;第九步:STI反版光刻;第十步:STI反版刻蚀(去掉HDP和氮氧化硅,停在氮化硅上);第十一步:去胶;第十二步:STI CMP。
本发明采用反版刻蚀去除无机抗反射层,不但能成功地将有源区区域的氮氧化硅有效去除,更由于同时去除了有源区区域的HDP,起到了对硅片表面进行平坦化的作用,缩短了CMP时间,改善了均匀性,为STI CMP提供了良好条件。对于CMP而言,甚至比无氮氧化硅的普通工艺还要有利;对于光刻而言,可充分发挥氮氧化硅优良的抗反射作用,加强光刻条宽控制。
附图说明
图1为现有技术剖面图,其工艺流程为:(a)第一步:硅片氧化;第二步:氮化硅淀积;第三步:氮氧化硅淀积;(b)第四步:STI光刻;(c)第五步:STI刻蚀;第六步:去胶;(d)第七步:氧化;第八步:HDP淀积;(e)第九步:STI CMP。
附图标号:1为氮氧化硅、2为氮化硅、3为二氧化硅、4为硅衬底、5为光刻胶、6为HDP。
具体实施方式
参见图1,在现有技术工艺流程的基础上增加一次反版刻蚀,位置在HDP淀积后。光刻版为STI反版,即STI光刻时的曝光区域此时被掩蔽,而STI光刻时被掩蔽的区域此时被曝光。刻蚀采用干法刻蚀,停在氮化硅上。为确保氮氧化硅全部刻尽,可加必要过腐蚀,即吃掉一部分氮化硅。由于CMP时氮化硅相对于HDP的选择比很高,不必担心没有足够的氮化硅掩蔽HDP的磨削。
由于在CMP前就已将氮氧化硅去除,避免了氮氧化硅对CMP的负面影响,解决了现有技术中光刻和CMP不能两全其美的问题。又由于在去氮氧化硅前已经去除了场区上的HDP,不但使得待CMP的HDP厚度减薄,也使得硅片表面更为平坦,从而缩短了CMP时间,改善了CMP均匀性。

Claims (2)

1、一种光刻无机抗反射层去除方法,其特征在于通过反版刻蚀去除无机抗反射层,具体步骤如下:第一步:硅片氧化;第二步:氮化硅淀积;第三步:氮氧化硅淀积;第四步:STI光刻;第五步:STI刻蚀;第六步:去胶;第七步:氧化;第八步:HDP淀积;第九步:STI反版光刻;第十步:STI反版刻蚀,去掉HDP和氮氧化硅,并使刻蚀停在氮化硅上;第十一步:去胶;第十二步:STI CMP。
2、根据权利要求1所述的方法,其特征在于上述的无机抗反射层为氮氧化硅或碳化硅。
CN 02136119 2002-07-19 2002-07-19 一种无机抗反射层去除方法 Expired - Fee Related CN1218371C (zh)

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Publication number Priority date Publication date Assignee Title
FR2889745B1 (fr) * 2005-08-10 2007-12-21 Commissariat Energie Atomique Revetement anti-reflet, en particulier pour cellules solaires, et procede de fabrication de ce revetement
CN105097491B (zh) * 2014-04-30 2018-09-21 无锡华润上华科技有限公司 一种基于氮氧化硅抗反射层的化学机械平坦化工艺

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