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    • 27. 发明授权
    • Nonvolatile semiconductor memory device with a multi-layer sidewall spacer structure and method for manufacturing the same
    • 具有多层侧壁间隔结构的非易失性半导体存储器件及其制造方法
    • US06555865B2
    • 2003-04-29
    • US09902820
    • 2001-07-10
    • Joon-Sung LeeWoon-Kyung Lee
    • Joon-Sung LeeWoon-Kyung Lee
    • H01L2976
    • H01L27/11526H01L27/105H01L27/11543H01L29/42324H01L29/792
    • The present invention provides a nonvolatile memory device having high reliability with novel sidewall spacer structures. The gate stack structure for use in a nonvolatile memory device comprises a semiconductor substrate, a gate stack formed on the semiconductor substrate. The gate stack has a sidewall and a top surface. A multi-layer sidewall spacer structure is formed on the sidewall of the gate stack. The multi-layer sidewall spacer structure includes a first oxide layer, a first nitride layer, a second oxide layer, and a second nitride layer that are sequentially stacked. With the present invention, even if the second nitride layer is perforated or damaged during the formation of contact holes, sidewalls of the gate stack of nonvolatile memory cell can be protected with the first nitride layer from mobile ions. Also, etching damage to source/drain regions or field regions can be reduced.
    • 本发明提供一种具有高可靠性的新型侧壁间隔结构的非易失性存储器件。 用于非易失性存储器件的栅极堆叠结构包括半导体衬底,形成在半导体衬底上的栅叠层。 栅极堆叠具有侧壁和顶部表面。 在栅叠层的侧壁上形成多层侧壁间隔结构。 多层侧壁间隔结构包括依次堆叠的第一氧化物层,第一氮化物层,第二氧化物层和第二氮化物层。 利用本发明,即使在形成接触孔期间第二氮化物层被穿孔或损坏,非易失性存储单元的栅极堆叠的侧壁可以被移动离子的第一氮化物层保护。 此外,可以减少对源极/漏极区域或场区域的蚀刻损伤。