CN112038232A - Sab氮化硅膜制造方法及sab工艺控制模块 - Google Patents
Sab氮化硅膜制造方法及sab工艺控制模块 Download PDFInfo
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- 229910052581 Si3N4 Inorganic materials 0.000 title claims abstract description 38
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 238000004886 process control Methods 0.000 title claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000005530 etching Methods 0.000 claims abstract description 120
- 238000000151 deposition Methods 0.000 claims abstract description 85
- 230000008021 deposition Effects 0.000 claims abstract description 76
- 238000000034 method Methods 0.000 claims abstract description 22
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000004065 semiconductor Substances 0.000 claims abstract description 19
- 230000008569 process Effects 0.000 claims abstract description 14
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims abstract description 12
- 229920005591 polysilicon Polymers 0.000 claims abstract description 12
- 239000000758 substrate Substances 0.000 claims abstract description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052710 silicon Inorganic materials 0.000 abstract description 10
- 239000010703 silicon Substances 0.000 abstract description 10
- 230000007547 defect Effects 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 40
- 230000001105 regulatory effect Effects 0.000 description 6
- 230000006872 improvement Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910021332 silicide Inorganic materials 0.000 description 1
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 1
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Abstract
本发明公开了一种SAB氮化硅膜制造方法,包括如下步骤:形成半导体器件的栅极结构、源区和漏区,栅极结构包括依次形成于半导体衬底表面的栅介质层和多晶硅栅,源区和漏区形成于对应的所述多晶硅栅的两侧;沉积SAB SiN形成SAB膜层;执行SAB膜层刻蚀;执行步骤S2时,沉积条件为:沉积源SiH4气体流量调节范围为100sccm~200sccm,沉积源NH3气体流量调节范围为0sccm~150sccm,沉积源He气体流量调节范围为0sccm~2000sccm。本发明还公开了一种用于半导体机台控制SAB工艺参数的SAB工艺控制模块。本发明能克服现有技术的缺陷,能提高栅极间SAB氮化硅膜覆盖率,提高SAB氮化硅膜均一性,防止SAB刻蚀中出现过刻蚀造成硅损耗,避免造成漏电增大,提高产品良率。
Description
技术领域
本发明涉及集成电路生产制造领域,特别是涉及一种SAB氮化硅膜制造方法。本发明还涉及一种SAB工艺控制模块。
背景技术
在集成电路生产制造中常常会用到有自对准的金属硅化物(Salicide)和无自对准的金属硅化物(Salicide)两种器件,因此要用到金属硅化物阻挡层(SAB)工艺。现有工艺采用SiN与OX(氧气)形成的氧化膜作为SAB膜,通过刻蚀来形成SAB区。
不同于传统逻辑工艺,eFlash工艺中的基本存储单元Cell,栅极Poly间距随基本存储单元尺寸cell size缩小而减小。随着侧墙的增加,在SAB SiN沉积与刻蚀后,由于淀积的SAB膜均一性较差,非常容易在小间距的栅极间出现硅损耗,造成漏电增大,良率损耗。
发明内容
在发明内容部分中引入了一系列简化形式的概念,该简化形式的概念均为本领域现有技术简化,这将在具体实施方式部分中进一步详细说明。本发明的发明内容部分并不意味着要试图限定出所要求保护的技术方案的关键特征和必要技术特征,更不意味着试图确定所要求保护的技术方案的保护范围。
本发明要解决的技术问题是提供一种能提高栅极间SAB氮化硅膜覆盖率,提高SAB氮化硅膜均一性,防止SAB刻蚀中出现过刻蚀造成硅损耗的SAB氮化硅膜制造方法。
本发明要解决的另一技术问题是提供一种用于半导体生产机台,能提高栅极间SAB氮化硅膜覆盖率,提高SAB氮化硅膜均一性,防止SAB刻蚀中出现过刻蚀造成硅损耗的SAB工艺控制模块。
为解决上述技术问题,本发明提供的SAB氮化硅膜制造方法,包括如下步骤:
S1,形成半导体器件的栅极结构、源区和漏区,栅极结构包括依次形成于半导体衬底表面的栅介质层和多晶硅栅,源区和漏区形成于对应的所述多晶硅栅的两侧;
S2,沉积SAB SiN形成SAB膜层;
S3,执行SAB膜层刻蚀;
其中,执行步骤S2时,沉积条件为:沉积源SiH4气体流量调节范围为100sccm~200sccm,沉积源NH3气体流量调节范围为0sccm~150sccm,沉积源He气体流量调节范围为0sccm~2000sccm。
可选择的,进一步改进所述的SAB氮化硅膜制造方法,沉积源SiH4气体流量调节范围为176sccm,沉积源NH3气体流量调节范围为100sccm,沉积源He气体流量调节范围为2000sccm。
可选择的,进一步改进所述的SAB氮化硅膜制造方法,执行步骤S3时,通过SiN和OX采用第一刻蚀选择比执行主刻蚀,且使主刻蚀时间在原有主刻蚀时间上减少第一预设时段;通过SiN和OX采用第二刻蚀选择比执行过刻蚀,且使过刻蚀时间在原有过刻蚀时间上增加第二预设时段。
可选择的,进一步改进所述的SAB氮化硅膜制造方法,第一刻蚀选择比SiN和OX刻蚀选择比为1:1,第一预设段范围为8S-12s;
第二刻蚀选择比SiN和OX刻蚀选择比为∞:1,第二预设段范围为30S-100s。
可选择的,进一步改进所述的SAB氮化硅膜制造方法,第一预设段为10s,第二预设段为60s。
本发明一种SAB工艺控制模块,其用于半导体机台控制SAB工艺参数,在执行沉积SAB SiN形成SAB膜层时,该SAB工艺控制模块控制沉积条件为:沉积源SiH4气体流量调节范围为100sccm~200sccm,沉积源NH3气体流量调节范围为0sccm~150sccm,沉积源He气体流量调节范围为0sccm~2000sccm。
可选择的,进一步改进所述的SAB工艺控制模块,在执行沉积SAB SiN形成SAB膜层时,该SAB工艺控制模块控制沉积条件为:沉积源SiH4气体流量调节范围为176sccm,沉积源NH3气体流量调节范围为100sccm,沉积源He气体流量调节范围为2000sccm。
可选择的,进一步改进所述的SAB工艺控制模块,执行SAB膜层刻蚀时,该SAB工艺控制模块控制SiN和OX采用第一刻蚀选择比执行主刻蚀,且使主刻蚀时间在原有主刻蚀时间上减少第一预设时段;该SAB工艺控制模块控制SiN和OX采用第二刻蚀选择比执行过刻蚀,且使过刻蚀时间在原有过刻蚀时间上增加第二预设时段。
可选择的,进一步改进所述的SAB工艺控制模块,第一刻蚀选择比SiN和OX刻蚀选择比为1:1,第一预设段范围为8S-12s;
第二刻蚀选择比SiN和OX刻蚀选择比为∞:1,第二预设段范围为30S-100s。
可选择的,进一步改进所述的SAB工艺控制模块,第一预设段为10s,第二预设段为60s。
本发明从两个方面来改善现有技术的缺陷:首先,通过改变现有技术SAB SiN沉积条件(改变沉积源SiH4、NH3和He的流量)改善氮化硅在小间距栅极间的台阶结构处SAB氮化硅膜覆盖率,提高SAB氮化硅膜均一性,避免造成硅损耗。其次,通过氮化硅膜刻蚀时,(相对现有技术)减少主刻蚀并控制主刻蚀选择比,增加过刻蚀时间并控制过刻蚀选择比的方案避免栅极间底部膜层出现过刻蚀。参考图1所示,采用现有技术形成的栅极间SAB氮化硅膜与其他位置SAB氮化硅膜厚度均一性差,在后续刻蚀过程中会造成栅极间硅损耗。参考图2所示,采用本发明形成的栅极间SAB氮化硅膜与其他位置SAB氮化硅膜厚度均一性一致,在后续刻蚀过程中不会造成栅极间硅损耗。
本发明两个方面的工艺改善是相互独立的关系,可以独立实施均能克服现有技术的缺陷,能提高栅极间SAB氮化硅膜覆盖率,提高SAB氮化硅膜均一性,防止SAB刻蚀中出现过刻蚀造成硅损耗,避免造成漏电增大,提高产品良率。如果将本发明两个方面的工艺改善结合使用将能获得更好的技术效果。
附图说明
本发明附图旨在示出根据本发明的特定示例性实施例中所使用的方法、结构和/或材料的一般特性,对说明书中的描述进行补充。然而,本发明附图是未按比例绘制的示意图,因而可能未能够准确反映任何所给出的实施例的精确结构或性能特点,本发明附图不应当被解释为限定或限制由根据本发明的示例性实施例所涵盖的数值或属性的范围。下面结合附图与具体实施方式对本发明作进一步详细的说明:
图1是通过现有技术形成的栅极间SAB氮化硅膜覆盖效果示意图。
图2是通过本发明形成的栅极间SAB氮化硅膜覆盖效果示意图。
具体实施方式
以下通过特定的具体实施例说明本发明的实施方式,本领域技术人员可由本说明书所公开的内容充分地了解本发明的其他优点与技术效果。本发明还可以通过不同的具体实施方式加以实施或应用,本说明书中的各项细节也可以基于不同观点加以应用,在没有背离发明总的设计思路下进行各种修饰或改变。需说明的是,在不冲突的情况下,以下实施例及实施例中的特征可以相互组合。本发明下述示例性实施例可以多种不同的形式来实施,并且不应当被解释为只限于这里所阐述的具体实施例。应当理解的是,提供这些实施例是为了使得本发明的公开彻底且完整,并且将这些示例性具体实施例的技术方案充分传达给本领域技术人员。
第一实施例,本发明提供一种SAB氮化硅膜制造方法,包括如下步骤:
S1,形成半导体器件的栅极结构、源区和漏区,栅极结构包括依次形成于半导体衬底表面的栅介质层和多晶硅栅,源区和漏区形成于对应的所述多晶硅栅的两侧;
S2、沉积SAB SiN形成SAB膜层;
S3,执行SAB膜层刻蚀;
执行步骤S2时,沉积条件为:沉积源SiH4气体流量调节范围为100sccm~200sccm,沉积源NH3气体流量调节范围为0sccm~150sccm,沉积源He气体流量调节范围为0sccm~2000sccm。示例性的现有技术中沉积源SiH4气体流量调节范围为300sccm,沉积源NH3气体流量调节范围为200sccm,沉积源He气体流量调节范围为3000sccm。沉积源气体流量调节范围不属于本发明第一实施例的范围,则无法改善栅极间SAB氮化硅膜覆盖率,只有在本发明第一实施例的范围内实施沉积才能改善栅极间SAB氮化硅膜覆盖率。
可选择的,改进上述第一实施例,沉积源SiH4气体流量调节范围为176sccm,沉积源NH3气体流量调节范围为100sccm,沉积源He气体流量调节范围为2000sccm。
第二实施例,本发明提供一种SAB氮化硅膜制造方法,包括如下步骤:
S1,形成半导体器件的栅极结构、源区和漏区,栅极结构包括依次形成于半导体衬底表面的栅介质层和多晶硅栅,源区和漏区形成于对应的所述多晶硅栅的两侧;
S2、沉积SAB SiN形成SAB膜层;
S3,执行SAB膜层刻蚀;
执行步骤S3时,通过SiN和OX采用第一刻蚀选择比执行主刻蚀,且使主刻蚀时间在原有主刻蚀时间上减少第一预设时段;通过SiN和OX采用第二刻蚀选择比执行过刻蚀,且使过刻蚀时间在原有过刻蚀时间上增加第二预设时段。
示例性的现有技术中主刻蚀时间为30S,SiN和OX刻蚀选择比为2:1,过刻蚀时间为50S,SiN和OX刻蚀选择比为100:1;该刻蚀参数范围不属于本发明第二实施例的范围,则无法改善栅极间SAB氮化硅膜过刻蚀的缺陷会造成硅损耗,只有在本发明第二实施例的范围内实施刻蚀才能避免过刻蚀的缺陷会造成硅损耗。
可选择的,改进上述第二实施例,第一刻蚀选择比SiN和OX刻蚀选择比为1:1,第一预设段范围为8S-12s;
第二刻蚀选择比SiN和OX刻蚀选择比为∞:1,第二预设段范围为30S-100s。
可选择的,进一步改进上述第二实施例,第一预设段为10s,第二预设段为60s。
第三实施例,本发明提供一种SAB氮化硅膜制造方法,包括如下步骤:
S1,形成半导体器件的栅极结构、源区和漏区,栅极结构包括依次形成于半导体衬底表面的栅介质层和多晶硅栅,源区和漏区形成于对应的所述多晶硅栅的两侧;
S2、沉积SAB SiN形成SAB膜层,沉积条件为:沉积源SiH4气体流量调节范围为100sccm~200sccm,沉积源NH3气体流量调节范围为0sccm~150sccm,沉积源He气体流量调节范围为0sccm~2000sccm;
S3,执行SAB膜层刻蚀,通过SiN和OX采用第一刻蚀选择比执行主刻蚀,且使主刻蚀时间在原有主刻蚀时间上减少第一预设时段;通过SiN和OX采用第二刻蚀选择比执行过刻蚀,且使过刻蚀时间在原有过刻蚀时间上增加第二预设时段。
可选择的,改进上述第三实施例,沉积源SiH4气体流量调节范围为176sccm,沉积源NH3气体流量调节范围为100sccm,沉积源He气体流量调节范围为2000sccm;
第一刻蚀选择比SiN和OX刻蚀选择比为1:1,第一预设段范围为8S-12s;
第二刻蚀选择比SiN和OX刻蚀选择比为∞:1,第二预设段范围为30S-100s;
可选择的,进一步改进上述第三实施例,第一预设段为10s,第二预设段为60s。
第四实施例,本发明提供一种SAB工艺控制模块,其用于半导体机台控制SAB工艺参数,在执行沉积SAB SiN形成SAB膜层时,该SAB工艺控制模块控制沉积条件为:沉积源SiH4气体流量调节范围为100sccm~200sccm,沉积源NH3气体流量调节范围为0sccm~150sccm,沉积源He气体流量调节范围为0sccm~2000sccm。
可选择的,改进上述第四实施例,在执行沉积SAB SiN形成SAB膜层时,该SAB工艺控制模块控制沉积条件为:沉积源SiH4气体流量调节范围为176sccm,沉积源NH3气体流量调节范围为100sccm,沉积源He气体流量调节范围为2000sccm。
第五实施例,本发明提供一种SAB工艺控制模块,其用于半导体机台控制SAB工艺参数,执行SAB膜层刻蚀时,该SAB工艺控制模块控制SiN和OX采用第一刻蚀选择比执行主刻蚀,且使主刻蚀时间在原有主刻蚀时间上减少第一预设时段;该SAB工艺控制模块控制SiN和OX采用第二刻蚀选择比执行过刻蚀,且使过刻蚀时间在原有过刻蚀时间上增加第二预设时段。
可选择的,改进上述第五实施例,第一刻蚀选择比SiN和OX刻蚀选择比为1:1,第一预设段范围为8S-12s;
第二刻蚀选择比SiN和OX刻蚀选择比为∞:1,第二预设段范围为30S-100s。
可选择的,进一步改进上述第五实施例,第一预设段为10s,第二预设段为60s。
第六实施例,本发明提供一种SAB工艺控制模块,其用于半导体机台控制SAB工艺参数,在执行沉积SAB SiN形成SAB膜层时,该SAB工艺控制模块控制沉积条件为:沉积源SiH4气体流量调节范围为100sccm~200sccm,沉积源NH3气体流量调节范围为0sccm~150sccm,沉积源He气体流量调节范围为0sccm~2000sccm;
并且,执行SAB膜层刻蚀时,该SAB工艺控制模块控制SiN和OX采用第一刻蚀选择比执行主刻蚀,且使主刻蚀时间在原有主刻蚀时间上减少第一预设时段;该SAB工艺控制模块控制SiN和OX采用第二刻蚀选择比执行过刻蚀,且使过刻蚀时间在原有过刻蚀时间上增加第二预设时段。
可选择的,改进上述第六实施例,在执行沉积SAB SiN形成SAB膜层时,该SAB工艺控制模块控制沉积条件为:沉积源SiH4气体流量调节范围为176sccm,沉积源NH3气体流量调节范围为100sccm,沉积源He气体流量调节范围为2000sccm;
第一刻蚀选择比SiN和OX刻蚀选择比为1:1,第一预设段范围为8S-12s;
第二刻蚀选择比SiN和OX刻蚀选择比为∞:1,第二预设段范围为30S-100s。
可选择的,进一步改进上述第六实施例,第一预设段为10s,第二预设段为60s。
除非另有定义,否则这里所使用的全部术语(包括技术术语和科学术语)都具有与本发明所属领域的普通技术人员通常理解的意思相同的意思。还将理解的是,除非这里明确定义,否则诸如在通用字典中定义的术语这类术语应当被解释为具有与它们在相关领域语境中的意思相一致的意思,而不以理想的或过于正式的含义加以解释。
以上通过具体实施方式和实施例对本发明进行了详细的说明,但这些并非构成对本发明的限制。在不脱离本发明原理的情况下,本领域的技术人员还可做出许多变形和改进,这些也应视为本发明的保护范围。
Claims (10)
1.一种SAB氮化硅膜制造方法,包括如下步骤:
S1,形成半导体器件的栅极结构、源区和漏区,栅极结构包括依次形成于半导体衬底表面的栅介质层和多晶硅栅,源区和漏区形成于对应的所述多晶硅栅的两侧;
S2,沉积SAB SiN形成SAB膜层;
S3,执行SAB膜层刻蚀;
其特征在于,执行步骤S2时,沉积条件为:沉积源SiH4气体流量调节范围为100sccm~200sccm,沉积源NH3气体流量调节范围为0sccm~150sccm,沉积源He气体流量调节范围为0sccm~2000sccm。
2.如权利要求1所述的SAB氮化硅膜制造方法,其特征在于:
沉积源SiH4气体流量调节范围为176sccm,沉积源NH3气体流量调节范围为100sccm,沉积源He气体流量调节范围为2000sccm。
3.如权利要求1所述的SAB氮化硅膜制造方法,其特征在于:
执行步骤S3时,通过SiN和OX采用第一刻蚀选择比执行主刻蚀,且使主刻蚀时间在原有主刻蚀时间上减少第一预设时段;通过SiN和OX采用第二刻蚀选择比执行过刻蚀,且使过刻蚀时间在原有过刻蚀时间上增加第二预设时段。
4.如权利要求3所述的SAB氮化硅膜制造方法,其特征在于:第一刻蚀选择比SiN和OX刻蚀选择比为1:1,第一预设段范围为8S-12s;
第二刻蚀选择比SiN和OX刻蚀选择比为∞:1,第二预设段范围为30S-100s。
5.如权利要求4所述的SAB氮化硅膜制造方法,其特征在于:第一预设段为10s,第二预设段为60s。
6.一种SAB工艺控制模块,其用于半导体机台控制SAB工艺参数,其特征在于:
在执行沉积SAB SiN形成SAB膜层时,该SAB工艺控制模块控制沉积条件为:沉积源SiH4气体流量调节范围为100sccm~200sccm,沉积源NH3气体流量调节范围为0sccm~150sccm,沉积源He气体流量调节范围为0sccm~2000sccm。
7.如权利要求6所述的SAB工艺控制模块,其特征在于:
在执行沉积SAB SiN形成SAB膜层时,该SAB工艺控制模块控制沉积条件为:沉积源SiH4气体流量调节范围为176sccm,沉积源NH3气体流量调节范围为100sccm,沉积源He气体流量调节范围为2000sccm。
8.如权利要求6所述的SAB工艺控制模块,其特征在于:
执行SAB膜层刻蚀时,该SAB工艺控制模块控制SiN和OX采用第一刻蚀选择比执行主刻蚀,且使主刻蚀时间在原有主刻蚀时间上减少第一预设时段;该SAB工艺控制模块控制SiN和OX采用第二刻蚀选择比执行过刻蚀,且使过刻蚀时间在原有过刻蚀时间上增加第二预设时段。
9.如权利要求8所述的SAB工艺控制模块,其特征在于:
第一刻蚀选择比SiN和OX刻蚀选择比为1:1,第一预设段范围为8S-12s;
第二刻蚀选择比SiN和OX刻蚀选择比为∞:1,第二预设段范围为30S-100s。
10.如权利要求9所述的SAB工艺控制模块,其特征在于:第一预设段为10s,第二预设段为60s。
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