Patent ID: 10804397

Abstract:
An SGT production method includes a first step of forming a fin-shaped semiconductor layer and a first insulating film; a second step of forming a second insulating film, depositing a first polysilicon, planarizing the first polysilicon, forming a third insulating film, forming a second resist, and etching the third insulating film, the first polysilicon, the second insulating film, and the fin-shaped semiconductor layer to form a pillar-shaped semiconductor layer, a first dummy gate, and a first hard mask; and a third step of forming a fourth insulating film, depositing a second polysilicon, planarizing the second polysilicon, subjecting the second polysilicon to etch back to expose the first hard mask, depositing a sixth insulating film, etching the sixth insulating film to form a second hard mask on a side wall of the first hard mask, and etching the second polysilicon to form a second dummy gate.