Patent ID: 11887814
Assignee: HITACHI HIGH-TECH CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A plasma processing method of selectively depositing a deposition film on a mask material with respect to a material to be etched, the plasma processing method comprising:
controlling an etching parameter by performing
a first step of adjusting a microwave power supply power;
a second step of adjusting a radio frequency bias power supply power; and
a third step of adjusting at least one of a microwave power supply repetition frequency, a microwave power supply duty ratio, a radio frequency bias power supply repetition frequency, and a radio frequency bias power supply duty ratio so that an incubation time of the mask material is shorter than an incubation time of the material to be etched to cause a deposition rate of the deposition film on the mask material to be higher than a deposition rate of the deposition film on the material to be etched following an end of the incubation time of the deposition film on the mask material, to cause an unevenness in line width to be less than 1.5 nm when the mask material has a width of greater than 2 nm.