Invention Grant
- Patent Title: Multi-level pulsing of DC and RF signals
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Application No.: US16400733Application Date: 2019-05-01
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Publication No.: US10580618B2Publication Date: 2020-03-03
- Inventor: Juline Shoeb , Alex Paterson , Ying Wu
- Applicant: Lam Research Corporation
- Applicant Address: US CA Fremont
- Assignee: Lam Research Corporation
- Current Assignee: Lam Research Corporation
- Current Assignee Address: US CA Fremont
- Agency: Penilla IP, APC
- Main IPC: H01J37/32
- IPC: H01J37/32

Abstract:
Systems and methods for multi-level pulsing of a parameter and multi-level pulsing of a frequency of a radio frequency (RF) signal are described. The RF signal is applied to a substrate support via a match. The parameter is pulsed from a low level to a high level while the frequency is pulsed from a low level to a high level. In addition, a direct current (DC) parameter is applied to the substrate support or another RF signal is applied to an upper electrode. The parameter and the frequency of the RF signal applied to the substrate support are simultaneously pulsed with the DC parameter or the RF signal applied to the upper electrode to increase a rate of processing a wafer, to increase mask selectivity, and to reduce angular spread of ions within a plasma chamber.
Public/Granted literature
- US20190295821A1 MULTI-LEVEL PULSING OF DC AND RF SIGNALS Public/Granted day:2019-09-26
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