CN103681274B - 半导体器件制造方法 - Google Patents

半导体器件制造方法 Download PDF

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CN103681274B
CN103681274B CN201210336478.2A CN201210336478A CN103681274B CN 103681274 B CN103681274 B CN 103681274B CN 201210336478 A CN201210336478 A CN 201210336478A CN 103681274 B CN103681274 B CN 103681274B
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CN103681274A (zh
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李春龙
李俊峰
闫江
孟令款
贺晓彬
陈广璐
赵超
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Institute of Microelectronics of CAS
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Abstract

本发明提供了一种假栅结构的制造方法。本发明在假栅材料层之上形成了ONO结构和顶层非晶硅层,首先以图案化的顶层非晶硅层为掩膜对ONO结构进行刻蚀,能够精确地控制其尺寸和剖面形貌,使ONO结构成为所期望的假栅材料层的掩膜,并且能够控制ONO各层刻蚀速率和厚度;接着,以ONO结构为掩膜刻蚀假栅材料层,同样实现图形的精确转移,使得假栅关键尺寸和剖面形貌得到精确控制,使得后续形成的金属栅极具有良好的粗糙度,保证了器件的性能及其稳定性。

Description

半导体器件制造方法
技术领域
本发明涉及半导体器件制造方法领域,特别地,涉及一种后栅工艺中的假栅制造方法。
背景技术
随着晶体管尺寸的不断缩小,HKMG(高K绝缘层和金属栅极)技术已经成为45nm以下半导体制程的必备技术。HKMG技术中,后栅工艺(Gate Last)方案被众多业内知名半导体企业广泛看好,其中,已有企业(例如美国Intel公司)生产出基于后栅工艺的HKMG产品。所谓后栅工艺,指的是在晶体管制造工艺中,首先形成假栅(dummy gate),然后,进行例如间隙壁(spacer)的沉积和刻蚀,源漏注入等工艺以形成源漏区域,在完成晶体管栅极之外的部件的制造以后,去除假栅,在假栅所在位置形成晶体管栅极。假栅通常为形成于二氧化硅层上的非晶硅或多晶硅假栅,而HKMG技术中最终形成的晶体管栅极为金属栅极。
目前看来,后栅工艺具有一些独特的优势,例如,克服了高温工艺负面影响,尤其是在金属栅材料选择上避开高温限制,另外,后栅工艺有助于大幅提高晶体管沟道应力,对提高PFETs性能尤其有效。但是,现有的后栅工艺面对如下问题还存在困难,例如超细线条(45nm以下)的形成,栅极的关键尺寸(Critical Dimension)和剖面形貌(Profile)的精确控制,硬掩膜结构的剖面形貌和剩余厚度控制,等等。因此,需要一种新的后栅工艺,尤其是假栅形成工艺,来解决上面所述的难题,从而更好地解决晶体管制造过程中的问题,确保晶体管性能。
发明内容
本发明提供一种晶体管后栅工艺中的假栅制造方法,其避免了现有后栅工艺的缺陷。
根据本发明的一个方面,本发明提供一种半导体器件制造方法,其包括如下步骤:
提供半导体衬底,在该半导体衬底上依次形成假栅栅极氧化层和假栅材料层;
在所述假栅材料层之上形成ONO结构,其从下至上包括第一氧化物层,氮化物层,第二氧化物层;
在所述ONO结构之上形成顶层非晶硅层;
在所述顶层非晶硅层之上形成图案化光刻胶层;
以所述图案化光刻胶层为掩膜,对所述顶层非晶硅层进行刻蚀,刻蚀停止在所述ONO结构的最上层;
以所述图案化光刻胶层以及剩余的所述顶层非晶硅层为掩膜,对所述ONO结构进行刻蚀,刻蚀停止在所述假栅材料层的上表面上;
去除所述图案化光刻胶层;
对所述假栅材料层进行刻蚀,刻蚀停止在所述假栅栅极氧化层的上表面上,形成所需要的假栅结构。
根据本发明的一个方面,所述假栅材料层的材料为非晶硅,厚度为900-1200埃;所述假栅栅极氧化层的材料为二氧化硅,厚度为20-40埃。
根据本发明的一个方面,所述第一氧化物层为SiO2,其厚度为100埃,所述氮化物层为Si3N4,其厚度为200埃,所述第二氧化物层为SiO2,其厚度为500-800埃。
根据本发明的一个方面,对所述ONO结构进行刻蚀,分为三个不同阶段,分别刻蚀所述第二氧化物层、所述氮化物层和所述第一氧化物层。
根据本发明的一个方面,所述顶层非晶硅层的厚度为400-600埃。
根据本发明的一个方面,对所述假栅材料层进行刻蚀具体包括:以剩余的所述顶层非晶硅层和所述ONO结构为掩膜,对所述假栅材料层进行刻蚀,刻蚀停止在所述假栅栅极氧化层的上表面上,同时,剩余的所述顶层非晶硅层也在该步骤中被完全除去。
根据本发明的一个方面,在形成所述假栅结构之后,依次进行如下步骤:
栅极间隙壁的沉积和刻蚀;
自对准地形成LDD区域、Halo结构和源漏区域;
形成源漏区域接触;
形成中间介质层,进行CMP工艺。
根据本发明的一个方面,在形成中间介质层,进行CMP工艺之后,去除所述假栅以及所述假栅下方的所述假栅栅极氧化层,以在所述中间介质层中形成栅极凹槽;然后,在所述栅极凹槽中依次沉积高K栅绝缘材料和金属栅极材料,并进行CMP工艺,从而形成了高K栅绝缘层和金属栅极,完成HKMG工艺的制造过程。
本发明的优点在于:本发明在假栅材料层之上形成了ONO结构和顶层非晶硅层,首先,以图案化的顶层非晶硅层为掩膜对ONO结构进行刻蚀,能够精确地控制其尺寸和剖面形貌,使ONO结构成为所期望的假栅材料层的掩膜,并且能够控制ONO各层最终厚度;接着,以ONO结构为掩膜刻蚀假栅材料层,同样实现图形的精确转移,使得假栅关键尺寸和剖面形貌得到精确控制,使得后续形成的金属栅极具有良好的粗糙度,有利于之后间隙壁沉积和刻蚀,以及硅化物形成、CMP等工艺的顺利进行,保证了器件的性能及其稳定性。另外,本发明的技术方案适用于亚45nm的技术带,不仅适合于工厂的大规模生产,也适合于实验室的先导工艺开发,通过部分优化,具备向更先进制造技术升级转移的能力。
附图说明
图1-8本发明提供的半导体器件制造方法流程示意图。
具体实施方式
以下,通过附图中示出的具体实施例来描述本发明。但是应该理解,这些描述只是示例性的,而并非要限制本发明的范围。此外,在以下说明中,省略了对公知结构和技术的描述,以避免不必要地混淆本发明的概念。
本发明提供一种半导体器件制造方法,特别地涉及后栅工艺中的假栅制造方法,其克服了现有后栅工艺中的一些难题。下面,参见附图1-8,将详细描述本发明提供的半导体器件制造方法。
首先,参见附图1,在半导体衬底10上依次形成假栅栅极氧化层11和假栅材料层12。其中,本实施例中采用了单晶硅衬底,可选地,也可采用锗衬底或者其他合适的半导体衬底。假栅栅极氧化层11可以通过热氧化方式形成,材料可以是SiO2,其厚度优选为20-40埃。假栅材料层12优选为非晶硅层,可选地为多晶硅层,采用LPCVD工艺形成,其厚度优选为900-1200埃。
接着,参见附图2,在假栅材料层12之上依次形成第一氧化物层13,氮化物层14,第二氧化物层15,其中,第一氧化物层13,氮化物层14和第二氧化物层15形成了ONO结构。第一氧化物层13可以是SiO2,采用PECVD工艺形成,其厚度为100埃。氮化物层14可以是Si3N4,采用LPCVD工艺形成,其厚度为200埃。第二氧化物层15可以是SiO2,采用PECVD工艺形成,其厚度为500-800埃。
接着,参见附图3,在ONO结构之上,形成顶层非晶硅层16。其中,顶层非晶硅层16采用LPCVD工艺形成,顶层非晶硅层16的厚度为400-600埃。
之后,参见附图4,在顶层非晶硅层16之上形成图案化光刻胶层17。该步骤具体包括:首先全面性涂敷一层光刻胶,然后,采用浸润式光刻或者电子束(eBeam)直写光刻对光刻胶层进行曝光,形成图案化光刻胶层17,图案化光刻胶层17具有小于45nm的线条尺寸。
接着,参见附图5,以图案化光刻胶层17为掩膜,对顶层非晶硅层16进行刻蚀。该步刻蚀工艺可以采用等离子干法刻蚀,刻蚀停止在ONO结构的最上层,也即第二氧化物层15的上表面上。
接着,参见附图6,以图案化光刻胶层17以及剩余的顶层非晶硅层16为掩膜,对ONO结构进行刻蚀。该步刻蚀工艺可以分为三个不同阶段,分别刻蚀第二氧化物层15、氮化物层14和第一氧化物层13,刻蚀最终停止在假栅材料层12的上表面上。
接着,参见附图7,去除图案化光刻胶层17。采用湿法清洗的方式,例如SPM/APM(SPM,H2SO4,H2O2和H2O的混合物;APM,NH4OH,H2O2和H2O的混合物),将剩余的图案化光刻胶层17清洗除去。
接着,参见附图8,对假栅材料层12进行刻蚀,停止在假栅栅极氧化层11的上表面上。该步刻蚀以剩余的顶层非晶硅层16和ONO结构为掩膜,对假栅材料层12进行刻蚀,由于顶层非晶硅层16的材料与假栅材料层12的材料相同,例如均为非晶硅,在该步刻蚀中顶层非晶硅层16也会被完全除去,因此,不需要采用额外的后续步骤去除顶层非晶硅层16。通过此步骤刻蚀,即可实现假栅的制造,其中,假栅堆栈包括了假栅材料层12和其上的ONO结构。
在假栅形成之后,可以进行晶体管其余部件的制造,例如,栅极间隙壁(spacer)的沉积和刻蚀,自对准地形成LDD区域、Halo结构、源漏区域,形成源漏接触,形成中间介质层,进行CMP工艺等等。在完成上述部件制造之后,去除假栅以及假栅下方的假栅栅极氧化层,这样,在中间介质层中形成了栅极凹槽,然后,在栅极凹槽中依次沉积高K栅绝缘材料和金属栅极材料,并进行CMP工艺,从而形成了高K栅绝缘层和金属栅极,完成HKMG工艺的制造过程。
至此,已经完全描述了本发明提供的制造方法。本发明在假栅材料层之上形成了ONO结构和顶层非晶硅层,首先以图案化的顶层非晶硅层为掩膜对ONO结构进行刻蚀,能够精确地控制其尺寸和剖面形貌,使ONO结构成为所期望的假栅材料层的掩膜,并且能够控制ONO各层刻蚀速率和厚度;接着,以ONO结构为掩膜刻蚀假栅材料层,同样实现图形的精确转移,使得假栅关键尺寸和剖面形貌得到精确控制,使得后续形成的金属栅极具有良好的粗糙度(Line Edge Roughens,LER),保证了器件的性能及其稳定性,同时,还为后续栅极间隙壁、CMP工艺以及假栅去除等工艺的顺利进行提供了保障。另外,本发明的技术方案适用于亚45nm的技术带,不仅适合于工厂的大规模生产,也适合于实验室的先导工艺开发,通过部分优化,具备向更先进制造技术(如22nm以下技术带)升级转移的能力。
以上参照本发明的实施例对本发明予以了说明。但是,这些实施例仅仅是为了说明的目的,而并非为了限制本发明的范围。本发明的范围由所附权利要求及其等价物限定。不脱离本发明的范围,本领域技术人员可以做出多种替换和修改,这些替换和修改都应落在本发明的范围之内。

Claims (7)

1.一种半导体器件制造方法,其特征在于,包括如下步骤:
提供半导体衬底,在该半导体衬底上依次形成假栅栅极氧化层和假栅材料层;
在所述假栅材料层之上形成ONO结构,其从下至上包括第一氧化物层,氮化物层,第二氧化物层;
在所述ONO结构之上形成顶层非晶硅层;
在所述顶层非晶硅层之上形成图案化光刻胶层;
以所述图案化光刻胶层为掩膜,对所述顶层非晶硅层进行刻蚀,刻蚀停止在所述ONO结构的最上层;
以所述图案化光刻胶层以及剩余的所述顶层非晶硅层为掩膜,对所述ONO结构进行刻蚀,刻蚀停止在所述假栅材料层的上表面上;
去除所述图案化光刻胶层;
对所述假栅材料层进行刻蚀,刻蚀停止在所述假栅栅极氧化层的上表面上,形成所需要的假栅结构;
其中,对所述假栅材料层进行刻蚀具体包括:
以剩余的所述顶层非晶硅层和所述ONO结构为掩膜,对所述假栅材料层进行刻蚀,刻蚀停止在所述假栅栅极氧化层的上表面上,同时,剩余的所述顶层非晶硅层也在该步骤中被完全除去。
2.根据权利要求1所述的方法,其特征在于,所述假栅材料层的材料为非晶硅,其厚度为900-1200埃;所述假栅栅极氧化层的材料为二氧化硅,厚度为20-40埃。
3.根据权利要求1所述的方法,其特征在于,所述第一氧化物层为SiO2,其厚度为100埃,所述氮化物层为Si3N4,其厚度为200埃,所述第二氧化物层为SiO2,其厚度为500-800埃。
4.根据权利要求1所述的方法,其特征在于,对所述ONO结构进行刻蚀,分为三个不同阶段,分别刻蚀所述第二氧化物层、所述氮化物层和所述第一氧化物层。
5.根据权利要求1所述的方法,其特征在于,所述顶层非晶硅层的厚度为400-600埃。
6.根据权利要求1所述的方法,其特征在于,在形成所述假栅结构之后,依次进行如下步骤:
栅极间隙壁的沉积和刻蚀;
自对准地形成LDD区域、Halo结构和源漏区域;
形成源漏区域接触;
形成中间介质层,进行CMP工艺。
7.根据权利要求6所述的方法,其特征在于,在形成中间介质层,进行CMP工艺之后,去除所述假栅以及所述假栅下方的所述假栅栅极氧化层,以在所述中间介质层中形成栅极凹槽;然后,在所述栅极凹槽中依次沉积高K栅绝缘材料和金属栅极材料,并进行CMP工艺,从而形成了高K栅绝缘层和金属栅极,完成HKMG工艺的制造过程。
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