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    • 4. 发明授权
    • Flash memory gate structure for widened lithography window
    • 用于加宽光刻窗的闪存门结构
    • US07888729B2
    • 2011-02-15
    • US12198345
    • 2008-08-26
    • Kangguo ChengLawrence A. ClevengerTimothy J. DaltonLouis L. Hsu
    • Kangguo ChengLawrence A. ClevengerTimothy J. DaltonLouis L. Hsu
    • H01L21/336
    • H01L29/7881H01L29/66825
    • A first portion of a semiconductor substrate belonging to a flash memory device region is recessed to a recess depth to form a recessed region, while a second portion of the semiconductor substrate belonging to a logic device region is protected with a masking layer. A first gate dielectric layer and a first gate conductor layer formed within the recessed region such that the first gate conductive layer is substantially coplanar with the top surfaces of the shallow trench isolation structures. A second gate dielectric layer, a second gate conductor layer, and a gate cap hard mask layer, each having a planar top surface, is subsequently patterned. The pattern of the gate structure in the flash memory device region is transferred into the first gate conductor layer and the first gate dielectric layer to form a floating gate and a first gate dielectric, respectively.
    • 属于闪存器件区域的半导体衬底的第一部分凹陷到凹陷深度以形成凹陷区域,而属于逻辑器件区域的半导体衬底的第二部分被掩蔽层保护。 形成在凹陷区域内的第一栅介质层和第一栅极导体层,使得第一栅极导电层与浅沟槽隔离结构的顶表面基本共面。 随后对第二栅介质层,第二栅极导体层和栅帽硬掩模层进行构图,每个具有平坦的顶表面。 闪存器件区域中的栅极结构的图案被转移到第一栅极导体层和第一栅极介电层中,以分别形成浮置栅极和第一栅极电介质。