Method of fabricating an SRAM device with a self-aligned thin film transistor structure

摘要

A process for fabricating SRAM cells, including MOSFET devices, as well as thin film transistor structures, has been developed. The process features self-alignment of the MOSFET polysilicon gate structure to the polysilicon gate structure of the thin film transistor. Self-alignment is accomplished via a photolithographic and dry etching patterning procedure, applied to a combination of polysilicon, and insulator layers, resulting in the desired polysilicon gate structures for both the MOSFET and thin film transistor devices.