Patent ID: 11901191
Assignee: DNF CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. An atomic layer etching method comprising:
forming a metal layer on a substrate; and
etching at least a portion of the metal layer,
wherein the etching at least the portion of the metal layer includes at least one etching cycle,
the at least one etching cycle includes supplying an active gas including a halogen gas onto the metal layer, and supplying an amine based etching support gas after the supplying the active gas, and
the supplying the etching support gas includes supplying the etching support gas at a feeding dosage of 50 Tory sec to 70 Tory sec,
the etching support gas is pentamethyldiethylenetriamine (PMDETA) expressed by the following formula, wherein H is hydrogen, C is carbon, and N is nitrogen.