CN113327842A - 半导体结构及其制备方法 - Google Patents

半导体结构及其制备方法 Download PDF

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CN113327842A
CN113327842A CN202010129156.5A CN202010129156A CN113327842A CN 113327842 A CN113327842 A CN 113327842A CN 202010129156 A CN202010129156 A CN 202010129156A CN 113327842 A CN113327842 A CN 113327842A
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layer
mask
material layer
etched
semiconductor structure
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黄帅
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Changxin Memory Technologies Inc
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Priority to US17/595,656 priority patent/US20220254626A1/en
Priority to PCT/CN2021/077012 priority patent/WO2021169862A1/zh
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Abstract

本发明涉及一种半导体结构及其制备方法,半导体结构的制备方法包括:提供待刻蚀层;于待刻蚀层的表面形成光刻胶层;对光刻胶层进行曝光处理,曝光后的光刻胶层包括掩膜部分和待去除部分;于光刻胶层的表面形成作用材料层;作用材料层与掩膜部分相互作用,以于掩膜部分的顶部形成掩膜层;去除残留的作用材料层;基于掩膜层刻蚀去除待去除部分,以形成掩膜图形。上述半导体结构的制备方法,能避免掩膜图形出现倾斜问题,使得后期形成的刻蚀图形更精确,提高器件质量,提高产品良率。

Description

半导体结构及其制备方法
技术领域
本发明涉及半导体制造领域,特别是涉及一种半导体结构及其制备方法。
背景技术
光刻(photoetching)是通过一系列生产步骤,将晶圆表面薄膜的特定部分除去的工艺。在此之后,晶圆表面会留下带有微图形结构的薄膜。通过光刻工艺过程,最终在晶圆上保留的是特征图形部分。一般的光刻工艺要经历硅片表面清洗烘干、涂底、旋涂光刻胶、软烘、对准曝光、后烘、显影、硬烘、刻蚀、检测等工序。但是,曝光后的光刻胶层经过显影后形成的图形化光刻胶层经常会倾斜,从而导致后期形成的微图形结构不精确。
发明内容
基于此,针对上述问题,本发明提供一种半导体结构及其制备方法。
本发明提供一种半导体结构的制备方法,包括:提供待刻蚀层;于所述待刻蚀层的表面形成光刻胶层;对所述光刻胶层进行曝光处理,曝光后的所述光刻胶层包括掩膜部分和待去除部分;于所述光刻胶层的表面形成作用材料层;所述作用材料层与所述掩膜部分相互作用,以于所述掩膜部分的顶部形成掩膜层;去除残留的所述作用材料层;基于所述掩膜层刻蚀去除所述待去除部分,以形成掩膜图形。
上述半导体结构的制备方法,能避免掩膜图形出现倾斜问题,使得后期形成的刻蚀图形更精确,提高器件质量,提高产品良率。
在其中一个实施例中,在形成所述掩膜图形之后,还包括:基于所述掩膜图形刻蚀所述待刻蚀层,以形成刻蚀图形。
在其中一个实施例中,所述作用材料层包括含金属的碱性材料层或有机金属高分子材料层。
在其中一个实施例中,所述作用材料层与所述掩膜部分相互扩散,以于所述掩膜部分的顶部形成掩膜层。
在其中一个实施例中,所述作用材料层与所述掩膜部分相互扩散包括:对所述作用材料层和所述掩膜部分进行热处理,以使所述作用材料层与所述掩膜部分相互扩散。
在其中一个实施例中,所述热处理的时间介于0.5分钟~12分钟之间,所述热处理的温度介于50℃~150℃之间。
本发明还提供一种半导体结构,包括:待刻蚀层;曝光后的光刻胶层,位于所述待刻蚀层的表面,所述光刻胶层包括掩膜部分和待去除部分;作用材料层,位于所述光刻胶层的表面;掩膜层,位于所述掩膜部分的顶部;所述掩膜层由所述作用材料层与所述掩膜部分相互作用而形成。
上述半导体结构,能避免后期形成的掩膜图形出现倾斜问题,使得后期形成的刻蚀图形更精确,提高器件质量,提高产品良率。在其中一个实施例中,所述掩膜部分包括曝光区域。
在其中一个实施例中,所述掩膜部分包括曝光区域,所述待去除部分包括未曝光区域。
在其中一个实施例中,所述掩膜部分包括未曝光区域,所述待去除部分包括曝光区域。
在其中一个实施例中,所述作用材料层包括含金属的碱性材料层或有机金属高分子材料层。
附图说明
图1为本发明的半导体结构的制备方法的流程图。
图2~图10为本发明的半导体结构的制备方法中各步骤所呈现的结构示意图;其中,图5亦为本发明的半导体结构所呈现的结构示意图。
图中:10、待刻蚀层;20、光刻胶层;201、掩膜部分;202、待去除部分;30、作用材料层;301、作用材料层;40、掩膜层;50、掩膜图形;50、刻蚀图形。
具体实施方式
为了便于理解本发明,下面将参照相关附图对本发明进行更全面的描述。附图中给出了本发明的首选实施例。但是,本发明可以以许多不同的形式来实现,并不限于本文所描述的实施例。相反地,提供这些实施例的目的是使对本发明的公开内容更加透彻全面。
除非另有定义,本文所使用的所有的技术和科学术语与属于本发明的技术领域的技术人员通常理解的含义相同。本文中在本发明的说明书中所使用的术语只是为了描述具体的实施例的目的,不是旨在于限制本发明。本文所使用的术语“及/或”包括一个或多个相关的所列项目的任意的和所有的组合。
在本发明的描述中,需要理解的是,术语“上”、“下”、“竖直”、“水平”、“内”、“外”等指示的方位或位置关系为基于附图所示的方法或位置关系,仅是为了便于描述本发明和简化描述,而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作,因此不能理解为对本发明的限制。
一个实施例,如图1所示,提供一种半导体结构的制备方法,包括:提供待刻蚀层10;于待刻蚀层10的表面形成光刻胶层20;对光刻胶层20进行曝光处理,曝光后的光刻胶层20包括掩膜部分201和待去除部分202;于光刻胶层20的表面形成作用材料层30;作用材料层30与掩膜部分201相互作用,以于掩膜部分201的顶部形成掩膜层40;去除残留的作用材料层301;基于掩膜层40刻蚀去除待去除部分202,以形成掩膜图形50。
在本实施例中,上述半导体结构的制备方法,能避免掩膜图形50出现倾斜问题,使得后期形成的刻蚀图形50更精确,提高器件质量,提高产品良率。
S10:如图2所示,提供待刻蚀层10。
在一个实施例中,待刻蚀层10的材质包括但不限于氧化硅层、氮化硅层、多晶硅层、低K介质材料、无定形碳、金属层中的一种或几种组合。
S20:如图3所示,于待刻蚀层10的表面形成光刻胶层20。
其中,光刻胶层20包括感光树脂、增感剂和溶剂。
S30:如图4所示,对光刻胶层20进行曝光处理,曝光后的光刻胶层20包括掩膜部分201和待去除部分202。
其中,对光刻胶层20进行选择性照射进行曝光处理。
在一个实施例中,掩膜部分201包括曝光区域,待去除部分202包括未曝光区域。此时,光刻胶层20为负光刻胶层20。
在另一个实施例中,掩膜部分201包括未曝光区域,待去除部分202包括曝光区域。此时,光刻胶层20为正光刻胶层20。
在一个实施例中,掩膜部分201包括酸性的高分子聚合物。
S40:如图5所示,于光刻胶层20的表面形成作用材料层30。
在一个实施例中,作用材料层30包括含金属的碱性材料层或有机金属高分子材料层。
S50:如图5所示,作用材料层30与掩膜部分201相互作用,以于掩膜部分201的顶部形成掩膜层40。
其中,掩膜层40相较于待去除部分202及作用材料层30具有较高的刻蚀选择比,以确保在刻蚀去除待去除部分202和作用材料层30时掩膜层40可以完整保留,而且掩膜层40的厚度较小。
在一个实施例中,作用材料层30与掩膜部分201的相互作用包括相互进行化学反应、相互物理吸收或单向吸附。
在一个实施例中,步骤S50,包括:作用材料层30与掩膜部分201相互扩散,以于掩膜部分201的顶部形成掩膜层40。
在一个实施例中,步骤S50,包括:对作用材料层30和掩膜部分201进行热处理,以使作用材料层30与掩膜部分201相互扩散。
其中,热处理可以采用热板加热。
在一个实施例中,热处理的时间介于0.5分钟~12分钟之间,例如,热处理的时间可以是4分钟、7分钟、9分钟、12分钟。热处理的温度介于50℃~150℃之间,例如,热处理的温度可以是50℃、80℃、120℃、150℃。
其中,扩散受热处理温度影响,温度越高扩散程度越大。
S50:如图7所示,去除残留的作用材料层301。
在一个实施例中,去除残留的作用材料层301的方法包括湿法刻蚀或干法刻蚀。
S70:如图8所示,基于掩膜层40刻蚀去除待去除部分202,以形成掩膜图形50。
在一个实施例中,刻蚀去除待去除部分202的方法包括干法刻蚀。
在一个实施例中,步骤S70之后,还包括:
S80:如图9所示,基于掩膜图形50刻蚀待刻蚀层10,以形成刻蚀图形50。
在一个实施例中,步骤S80之后,还包括:
S90:如图10所示,去除掩膜图形50和掩膜层40。
一般的光刻工艺要经历硅片表面清洗烘干、涂底、旋涂光刻胶、软烘、对准曝光、后烘、显影、硬烘、刻蚀、检测等工序,在显影的过程中,会使得显影形成的光刻胶图形倾斜,从而影响了图案的精确性。而在本发明中,于光刻胶层20的表面形成作用材料层30,作用材料层30与掩膜部分201相互作用,以于掩膜部分201的顶部形成掩膜层40,去除残留的作用材料层301,基于掩膜层40刻蚀去除待去除部分202,以形成掩膜图形50,由于掩膜层40不容易倾斜,所以能保证刻蚀图形50的精确性。
一个实施例,如图5所示,提供一种半导体结构,包括:待刻蚀层10;曝光后的光刻胶层20,位于待刻蚀层10的表面,光刻胶层20包括掩膜部分201和待去除部分202;作用材料层301,位于光刻胶层20的表面;掩膜层40,位于掩膜部分201的顶部;掩膜层40由作用材料层30与掩膜部分201相互作用而形成。
在本实施例中,上述半导体结构,能避免后期形成的掩膜图形50出现倾斜问题,使得后期形成的刻蚀图形50更精确,提高器件质量,提高产品良率。在其中一个实施例中,掩膜部分201包括曝光区域。
在一个实施例中,待刻蚀层10的材质包括但不限于氧化硅层、氮化硅层、多晶硅层、低K介质材料、无定形碳、金属层中的一种或几种组合。
在一个实施例中,掩膜部分201包括曝光区域,待去除部分202包括未曝光区域。
在一个实施例中,掩膜部分201包括未曝光区域,待去除部分202包括曝光区域。
在一个实施例中,作用材料层30包括含金属的碱性材料层或有机金属高分子材料层。
在一个实施例中,掩膜部分201包括酸性的高分子聚合物。
以上实施例的各技术特征可以进行任意的组合,为使描述简洁,未对上述实施例中的各个技术特征所有可能的组合都进行描述,然而,只要这些技术特征的组合不存在矛盾,都应当认为是本说明书记载的范围。
以上实施例仅表达了本发明的几种实施方式,其描述较为具体和详细,但并不能因此而理解为对发明专利范围的限制。应当指出的是,对于本领域的普通技术人员来说,在不脱离本发明构思的前提下,还可以做出若干变形和改进,这些都属于本发明的保护范围。因此,本发明专利的保护范围应以所附权利要求为准。

Claims (10)

1.一种半导体结构的制备方法,其特征在于,包括:
提供待刻蚀层;
于所述待刻蚀层的表面形成光刻胶层;
对所述光刻胶层进行曝光处理,曝光后的所述光刻胶层包括掩膜部分和待去除部分;
于所述光刻胶层的表面形成作用材料层;所述作用材料层与所述掩膜部分相互作用,以于所述掩膜部分的顶部形成掩膜层;
去除残留的所述作用材料层;
基于所述掩膜层刻蚀去除所述待去除部分,以形成掩膜图形。
2.根据权利要求1所述的半导体结构的制备方法,其特征在于,在形成所述掩膜图形之后,还包括:基于所述掩膜图形刻蚀所述待刻蚀层,以形成刻蚀图形。
3.根据权利要求1所述的半导体结构的制备方法,其特征在于,所述作用材料层包括含金属的碱性材料层或有机金属高分子材料层。
4.根据权利要求1所述的半导体结构的制备方法,其特征在于,所述作用材料层与所述掩膜部分相互扩散,以于所述掩膜部分的顶部形成掩膜层。
5.根据权利要求4所述的半导体结构的制备方法,其特征在于,所述作用材料层与所述掩膜部分相互扩散包括:对所述作用材料层和所述掩膜部分进行热处理,以使所述作用材料层与所述掩膜部分相互扩散。
6.根据权利要求5所述的半导体结构的制备方法,其特征在于,所述热处理的时间介于0.5分钟~12分钟之间,所述热处理的温度介于50℃~160℃之间。
7.一种半导体结构,其特征在于,包括:
待刻蚀层;
曝光后的光刻胶层,位于所述待刻蚀层的表面,所述光刻胶层包括掩膜部分和待去除部分;
作用材料层,位于所述光刻胶层的表面;
掩膜层,位于所述掩膜部分的顶部;所述掩膜层由所述作用材料层与所述掩膜部分相互作用而形成。
8.根据权利要求7所述的半导体结构,其特征在于,所述掩膜部分包括曝光区域,所述待去除部分包括未曝光区域。
9.根据权利要求7所述的半导体结构,其特征在于,所述掩膜部分包括未曝光区域,所述待去除部分包括曝光区域。
10.根据权利要求7所述的半导体结构,其特征在于,所述作用材料层包括含金属的碱性材料层或有机金属高分子材料层。
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