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发明授权
CN104051461B 高密度MOSFET阵列及其制备方法 有权 转让

高密度MOSFET阵列及其制备方法
摘要：
本发明提供一种高密度沟槽栅极的MOSFET阵列及制备方法，包括分为MOSFET阵列区和栅极拾取区的半导体衬底；多个精确隔开的氮化物压盖的有源沟槽栅极堆栈，嵌入在外延区中。每个氮化物压盖的有源沟槽栅极堆栈包括一个多晶硅沟槽栅极的堆栈，多晶硅沟槽栅极带有栅极氧化物壳和氮化硅压盖，覆盖在多晶硅沟槽栅极上方，并水平定位至栅极氧化物壳。氮化物压盖的有源沟槽栅极堆栈与源极、本体、外延区一起在MOSFET阵列区中构成MOSFET器件。在MOSFET阵列区和栅极拾取区上方，一个带图案的电介质区在MOSFET阵列上，一个带图案的金属层在带图案的电介质区上方。带图案的金属层和MOSFET阵列、栅极拾取区一起，通过内部氮化物压盖的有源沟槽栅极堆栈间隔，构成自对准的源极和本体接头。
摘要（英）：

A high density trench-gated MOSFET array and method are disclosed. It comprises semiconductor substrate partitioned into MOSFET array area and gate pickup area; epitaxial region, body region and source region; numerous precisely spaced active nitride-capped trench gate stacks (ANCTGS) embedded till the epitaxial region. Each ANCTGS comprises a stack of polysilicon trench gate with gate oxide shell and silicon nitride cap covering top of polysilicon trench gate and laterally registered to gate oxide shell. The ANCTGS forms, together with the source, body, epitaxial region, a MOSFET device in the MOSFET array area. Over MOSFET array area and gate pickup area, a patterned dielectric region atop the MOSFET array and a patterned metal layer atop the patterned dielectric region. Thus, the patterned metal layer forms, with the MOSFET array and the gate pickup area, self-aligned source and body contacts through the inter-ANCTGS separations.

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