发明授权
US06750112B2 Method of forming a bitline and a bitline contact, and dynamic memory cell including a bitline and bitline made contact according to the method
失效
形成位线和位线接触的方法,以及根据该方法的包括位线和位线的接触的动态存储单元
- 专利标题: Method of forming a bitline and a bitline contact, and dynamic memory cell including a bitline and bitline made contact according to the method
- 专利标题(中): 形成位线和位线接触的方法,以及根据该方法的包括位线和位线的接触的动态存储单元
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申请号: US10178641申请日: 2002-06-24
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公开(公告)号: US06750112B2公开(公告)日: 2004-06-15
- 发明人: Albrecht Kieslich
- 申请人: Albrecht Kieslich
- 优先权: EP01115217 20010622
- 主分类号: H01L2120
- IPC分类号: H01L2120
摘要:
A method of forming a bitline and a bitline contact and a dynamic random access memory (DRAM) cell array includes the following steps. The bitline and the bitline contact are formed in a two-step process, in which, first, the bitline contact is formed in a first dielectric layer and, then, the bitline of a conductive material having a lower resistivity than the bitline contact material is defined in a second dielectric layer (5). According to a preferred embodiment, the second dielectric layer (5) is made of a low k dielectric. The retention anneal process, which is usually performed in the standard DRAM process, is preferably made before depositing the bitline material and, optionally, the low k dielectric. A dynamic random access memory cell array having at least one bitline and a bitline contact can be manufactured by this method.
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