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    • 42. 发明公开
    • 플래쉬 메모리 소자의 게이트 형성방법
    • 用于形成闪存存储器设备的门的方法
    • KR1020060134280A
    • 2006-12-28
    • KR1020050053848
    • 2005-06-22
    • 에스케이하이닉스 주식회사
    • 안명규
    • H01L27/115
    • H01L21/311H01L21/02255H01L21/823437H01L27/11521H01L27/11568
    • A method for forming a gate of a flash memory device is provided to avoid a nonuniform gate pattern and residual tungsten silicide by reducing roughness on an interface between tungsten silicide and a polysilicon layer for a control gate. A tunnel oxide layer(11), a first polysilicon layer(12) for floating gate, and a dielectric layer are formed on a semiconductor substrate(10). An amorphous silicon layer is formed on the dielectric layer at a temperature of 500~530 deg.C, having a thickness of 1000-2500 angstroms. The amorphous silicon layer is planarized by an etch-back process. A second polysilicon layer(15) is formed on the amorphous silicon layer, having a smaller grain size than those of the amorphous silicon layer and a WSix layer. A WSix layer is formed on the second polysilicon layer. A heat treatment is performed to transform the amorphous silicon layer and the WSix layer into a third polysilicon layer(14a) and a WSi2 layer(16a). The WSi2 layer, the second polysilicon layer, the third polysilicon layer, the dielectric layer and the first polysilicon layer are selectively etched to form a gate.
    • 提供了一种用于形成闪存器件的栅极的方法,以通过减少用于控制栅极的硅化钨和多晶硅层之间的界面上的粗糙度来避免不均匀的栅极图案和残留的硅化钨。 隧道氧化物层(11),用于浮置栅极的第一多晶硅层(12)和电介质层形成在半导体衬底(10)上。 在500〜530℃的温度下在介电层上形成非晶硅层,厚度为1000-2500埃。 非晶硅层通过回蚀工艺平坦化。 第二多晶硅层(15)形成在非晶硅层上,其晶粒尺寸小于非晶硅层和WSix层。 在第二多晶硅层上形成WSix层。 进行热处理以将非晶硅层和WSix层转变成第三多晶硅层(14a)和WSi2层(16a)。 选择性地蚀刻WSi2层,第二多晶硅层,第三多晶硅层,电介质层和第一多晶硅层以形成栅极。