CN113299757A - 一种抑制尖峰电压的mosfet结构及其制造方法 - Google Patents

一种抑制尖峰电压的mosfet结构及其制造方法 Download PDF

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CN113299757A
CN113299757A CN202110556184.XA CN202110556184A CN113299757A CN 113299757 A CN113299757 A CN 113299757A CN 202110556184 A CN202110556184 A CN 202110556184A CN 113299757 A CN113299757 A CN 113299757A
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夏华忠
李健
黄传伟
诸建周
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Wuxi Roum Semiconductor Technology Co ltd
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Abstract

本发明是抑制尖峰电压的MOSFET结构及制造方法,结构包括依次连接的漏极、漂移区、体区、源极和金属层,还包括接触孔和宽度0.8μm沟槽,沟槽内为厚度0.1μm栅氧,栅氧中心为厚度0.4μm栅极多晶硅,栅极多晶硅中心设宽度0.2μm二氧化硅层。方法:1)外延层光刻;2)沟槽干法刻蚀;3)除光刻胶;4)栅氧形成;5)栅极多晶硅成长;6)硼磷离子注入;7)表面多晶硅刻蚀;8)形成源区体区;9)形成二氧化硅层间膜,光刻和干法刻蚀形成接触孔;10)溅射铝金属层,光刻和等离子干法刻蚀形成金属布线层。优点:在栅极多晶硅中间增加二氧化硅层可降低栅极多晶电阻率,降低栅极电阻,抑制尖峰电流,不增加额外成本。

Description

一种抑制尖峰电压的MOSFET结构及其制造方法
技术领域
本发明涉及的是一种抑制尖峰电压的MOSFET结构及其制造方法。
背景技术
沟槽MOSFET由于工艺简洁、成本可控、性能良好而被广泛使用,但是现有技术MOSFET(图1)的栅极(栅极多晶硅)电阻较低,往往导致其尖峰电流很大,有一定的机率导致器件的损坏;具体的,开启过程中,沟道电流在上升过程冲,会出现尖峰电流,尖峰电流过大的时候,容易损伤器件。尖峰电流受栅极电阻影响,当栅极电阻很小的时候,尖峰电流会特别大。
发明内容
本发明提出的是一种抑制尖峰电压的MOSFET结构及其制造方法,其目的旨在克服现有技术存在的上述不足,实现当栅极电阻降低后可减小尖峰电流,保护器件。
本发明的技术解决方案:一种抑制尖峰电压的MOSFET结构,其结构包括从下至上依次连接的漏极、漂移区、体区、源极和金属层,还包括接触孔和沟槽,沟槽内为栅氧,栅氧中心为栅极多晶硅,栅极多晶硅中心设二氧化硅层。
优选的,所述的沟槽宽度0.8μm,栅氧厚度0.1μm,栅极多晶硅厚度0.4μm,二氧化硅层宽度0.2μm。
一种抑制尖峰电压的MOSFET结构的制造方法,包括以下工艺步骤:
1)在外延层的基础上进行光刻,用以定义沟槽的宽度和位置,具体是先进行光刻胶的涂布,然后在光刻机内通过光刻的方式,把光刻板上的图形转移到晶圆上,使得晶圆上留下由光刻胶形成的图形;
2)进行沟槽干法刻蚀,形成0.8μm宽度沟槽,在干法刻蚀时,由于部分区域被光刻胶阻挡,未被刻蚀,另外一部分没有被阻挡的区域被刻蚀并形成沟槽;
3)进行光刻胶去除,剩下外延层上的沟槽;
4)在高温炉管中进行栅氧的形成,厚度0.1μm;
5)在炉管中进行栅极多晶硅的成长,通入气体SiH4,多晶硅厚度0.2μm;
6)对栅极多晶硅进行硼离子和磷离子的注入调节多晶硅的电阻率;
7)进行表面多晶硅刻蚀,使用各向异性的等离子干法刻蚀,由于各向异性,沟槽内侧壁的多晶硅不会被刻蚀而留下;
8)通过注入硼和注入砷,分别形成源区和体区;
9)通过化学气相沉积的方式,形成一层7000A的二氧化硅作为层间膜,然后通过光刻和干法刻蚀的方式形成接触孔;
10)先溅射一层1μm的铝金属层,再通过光刻和等离子干法刻蚀,形成金属布线层,得到抑制尖峰电压的MOSFET结构。
优选的,所述的步骤6)中硼离子注入条件为1E13、20K电子伏特,磷离子注入条件为1.5E13、40K电子伏特。
优选的,所述的步骤8)硼和砷的注入条件分别为B、1E3、250K和As、4E5、40K。
本发明的优点:相比传统的MOSFET,在栅极多晶硅的中间增加了二氧化硅层,可有效降低栅极多晶的电阻率,从而降低栅极电阻,有效抑制尖峰电流,保护MOSFET不被损坏,且是在沟槽工艺的基础上进行的优化,不需要增加额外的成本。
附图说明
图1是现有技术沟槽MOSFET的结构示意图。
图2是本发明抑制尖峰电压的MOSFET结构的制造方法步骤1)示意图。
图3是本发明抑制尖峰电压的MOSFET结构的制造方法步骤2)示意图。
图4是本发明抑制尖峰电压的MOSFET结构的制造方法步骤3)示意图。
图5是本发明抑制尖峰电压的MOSFET结构的制造方法步骤4)示意图。
图6是本发明抑制尖峰电压的MOSFET结构的制造方法步骤5)示意图。
图7是本发明抑制尖峰电压的MOSFET结构的制造方法步骤6)示意图。
图8是本发明抑制尖峰电压的MOSFET结构的制造方法步骤7)示意图。
图9是本发明抑制尖峰电压的MOSFET结构的制造方法步骤8)示意图。
图10是本发明抑制尖峰电压的MOSFET结构的制造方法步骤9)示意图。
图11是本发明抑制尖峰电压的MOSFET结构的制造方法步骤10)示意图暨本发明抑制尖峰电压的MOSFET结构的结构示意图。
具体实施方式
下面结合实施例和具体实施方式对本发明作进一步详细的说明。
如图11所示,一种抑制尖峰电压的MOSFET结构,其结构包括从下至上依次连接的漏极、漂移区、体区、源极和金属层,还包括接触孔和沟槽,沟槽内为栅氧,栅氧中心为栅极多晶硅,栅极多晶硅中心设二氧化硅层。以上为本发明的关键点,通过在多晶的中间形成二氧化硅,减少了多晶的体积和横截面,在不改变多晶掺杂浓度的情况下,增加多晶硅的电阻,降低开关速度,减小尖峰电压。由于受到沟槽宽度、多晶硅厚度等相互关系的影响,设计沟槽宽度0.8μm,栅氧厚度0.1μm,栅极多晶硅厚度0.4μm,最后容许填入二氧化硅层宽度0.2μm。
一种抑制尖峰电压的MOSFET结构的制造方法,包括以下工艺步骤:
1)如图2所示,在外延层的基础上进行光刻,用以定义沟槽的宽度和位置,具体是先进行光刻胶的涂布,然后在光刻机内通过光刻的方式,把光刻板上的图形转移到晶圆上,使得晶圆上留下由光刻胶形成的图形;
2)如图3所示,进行沟槽干法刻蚀,形成沟槽,在干法刻蚀时,由于部分区域被光刻胶阻挡,未被刻蚀,另外一部分没有被阻挡的区域被刻蚀并形成沟槽;
3)如图4所示,进行光刻胶去除,剩下外延层上的沟槽;
4)如图5所示,在高温炉管中进行栅氧的形成,厚度0.1μm;
5)如图6所示,在炉管中进行栅极多晶硅的成长,需要通入的主要气体为SiH4,多晶硅的厚度为0.2μm;
6)如图7所示,对栅极多晶硅进行硼离子和磷离子的注入调节多晶硅的电阻率,硼离子注入条件为1E13、20K电子伏特,磷离子注入条件为1.5E13、40K电子伏特;
7)如图8所示,进行表面多晶硅刻蚀,使用各向异性的等离子干法刻蚀,由于各向异性,沟槽内侧壁的多晶硅不会被刻蚀而留下;
8)如图9所示,通过注入硼和注入砷,分别形成源区和体区,条件分别为B、1E3、250K和As、4E5、40K;
9)如图10所示,通过化学气相沉积的方式,形成一层7000A的二氧化硅作为层间膜,然后通过光刻和干法刻蚀的方式形成接触孔;
10)如图11所示,先溅射一层1μm的铝金属层,再通过光刻和等离子干法刻蚀,形成金属布线层,得到抑制尖峰电压的MOSFET最终结构。
所述的步骤2)形成的沟槽宽度X1为0.8μm,所述的步骤4)形成的栅氧厚度X2为0.1μm,所述的步骤5)成长的栅极多晶硅厚度X3为0.4μm。因为在栅氧成长之后,栅极多晶硅不能完全填满沟槽。
以上所述的仅是本发明的优选实施方式,应当指出,对于本领域的普通技术人员来说,在不脱离本发明创造构思的前提下,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。

Claims (5)

1.一种抑制尖峰电压的MOSFET结构,其特征包括从下至上依次连接的漏极、漂移区、体区、源极和金属层,还包括接触孔和沟槽,沟槽内为栅氧,栅氧中心为栅极多晶硅,栅极多晶硅中心设二氧化硅层。
2.如权利要求1所述的一种抑制尖峰电压的MOSFET结构,其特征是所述的沟槽宽度0.8μm,栅氧厚度0.1μm,栅极多晶硅厚度0.4μm,二氧化硅层宽度0.2μm。
3.如权利要求2所述的一种抑制尖峰电压的MOSFET结构的制造方法,其特征是该方法包括以下工艺步骤:
1)在外延层的基础上进行光刻,用以定义沟槽的宽度和位置,具体是先进行光刻胶的涂布,然后在光刻机内通过光刻的方式,把光刻板上的图形转移到晶圆上,使得晶圆上留下由光刻胶形成的图形;
2)进行沟槽干法刻蚀,形成0.8μm宽度沟槽,在干法刻蚀时,由于部分区域被光刻胶阻挡,未被刻蚀,另外一部分没有被阻挡的区域被刻蚀并形成沟槽;
3)进行光刻胶去除,剩下外延层上的沟槽;
4)在高温炉管中进行栅氧的形成,厚度0.1μm;
5)在炉管中进行栅极多晶硅的成长,通入气体SiH4,多晶硅厚度0.2μm;
6)对栅极多晶硅进行硼离子和磷离子的注入调节多晶硅的电阻率;
7)进行表面多晶硅刻蚀,使用各向异性的等离子干法刻蚀,由于各向异性,沟槽内侧壁的多晶硅不会被刻蚀而留下;
8)通过注入硼和注入砷,分别形成源区和体区;
9)通过化学气相沉积的方式,形成一层7000A的二氧化硅作为层间膜,然后通过光刻和干法刻蚀的方式形成接触孔;
10)先溅射一层1μm的铝金属层,再通过光刻和等离子干法刻蚀,形成金属布线层,得到抑制尖峰电压的MOSFET结构。
4.如权利要求3所述的一种抑制尖峰电压的MOSFET结构的制造方法,其特征是所述的步骤6)中硼离子注入条件为1E13、20K电子伏特,磷离子注入条件为1.5E13、40K电子伏特。
5.如权利要求3所述的一种抑制尖峰电压的MOSFET结构的制造方法,其特征是所述的步骤8)硼和砷的注入条件分别为B、1E3、250K和As、4E5、40K。
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