Method for the formation of a boron-doped silicon gate layer underlying a cobalt silicide layer
    2.
    发明授权
    Method for the formation of a boron-doped silicon gate layer underlying a cobalt silicide layer 有权
    在钴硅化物层下面形成硼掺杂硅栅极层的方法

    公开(公告)号:US06242348B1

    公开(公告)日:2001-06-05

    申请号:US09411566

    申请日:1999-10-04

    CPC classification number: H01L21/28518 H01L21/26506 H01L21/28052 H01L29/665

    Abstract: Process for forming a boron-doped silicon gate layer underlying a cobalt silicide layer that reduces the risk of grooving and agglomeration of cobalt silicide layer, as well as boron penetration into a gate oxide layer. The process includes providing a PMOS transistor structure that includes an N-well on a P-type silicon substrate, a gate oxide layer and a silicon gate layer. Next, a cobalt layer is deposited on the PMOS transistor structure, which is then subjected to a first thermal treatment to form a bilayer CoSi/silicon stack structure. After removing unreacted cobalt, boron dopant (BF2+ or B+) and nitrogen ions (N2+) are implanted into the bilayer CoSi/silicon stack structure. The bilayer CoSi/silicon stack structure, implanted boron and implanted nitrogen are then subjected to second thermal treatment to form a CoSi2 layer on the silicon gate layer and to thermally activate the implanted boron. Also included is a process where a PMOS transistor structure that includes an N-well on a P-type silicon substrate, a gate oxide layer and a silicon gate layer is first provided, followed by the implantation of nitrogen into the silicon gate layer. Next, a cobalt layer is deposited on the PMOS transistor structure, which is then subjected to a first thermal treatment to form a bilayer CoSi/silicon stack structure. After removing unreacted cobalt, boron is implanted into the bilayer CoSi/silicon stack structure. The bilayer CoSi/silicon stack structure and implanted boron and implanted nitrogen are then subjected to second thermal treatment to form a CoSi2 layer and to thermally activate the implanted boron.

    Abstract translation: 用于在钴硅化物层下面形成硼掺杂硅栅极层的方法,其降低了硅化钴层的开槽和附聚的风险,以及硼渗入栅极氧化物层。 该工艺包括提供在P型硅衬底,栅极氧化物层和硅栅极层上包括N阱的PMOS晶体管结构。 接下来,在PMOS晶体管结构上沉积钴层,然后对其进行第一热处理以形成双层CoSi /硅堆叠结构。 在去除未反应的钴后,将硼掺杂剂(BF 2 +或B +)和氮离子(N 2 +)注入到双层CoSi /硅堆叠结构中。 然后对双层CoSi /硅堆叠结构,注入的硼和注入的氮进行第二次热处理,以在硅栅极层上形成CoSi 2层,并热激活注入的硼。 还包括首先提供在P型硅衬底,栅极氧化物层和硅栅极层上包括N阱的PMOS晶体管结构,然后将氮注入硅栅极层的工艺。 接下来,在PMOS晶体管结构上沉积钴层,然后对其进行第一热处理以形成双层CoSi /硅堆叠结构。 除去未反应的钴后,将硼注入到双层CoSi /硅堆叠结构中。 然后将双层CoSi /硅堆叠结构和注入的硼和注入的氮进行第二次热处理以形成CoSi 2层并热激活注入的硼。

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