Patent ID: 11961735
Assignee: TOKYO ELECTRON LIMITED
Field: Semiconductors (Electrical engineering)
Classification: CPC C  H | IPC C  H

Claim 10:
11. A method of processing a substrate, the method comprising:
performing a cyclic plasma process to selectively etch a metal oxide layer of the substrate, the substrate comprising a silicon-containing layer, the cyclic plasma process comprising a plurality of cycles, one cycle of the plurality of cycles comprising:
applying, during a first time interval, a first source power to a source electrode of a plasma processing chamber and a first bias power to a bias electrode of the plasma processing chamber and flowing a deposition gas comprising methane, ethane, or ethylene into the plasma processing chamber to selectively deposit a polymeric film over the silicon-containing layer relative to the metal oxide layer;
during a second time interval, stopping the flowing of the deposition gas and the applying of the first source power and the first bias power, and purging the plasma processing chamber with an etch gas comprising fluorine; and
applying, during a third time interval, a second source power to the source electrode and a second bias power to the bias electrode and flowing the etch gas into the plasma processing chamber to etch the metal oxide layer, the silicon-containing layer being covered under the polymeric film during the third interval.