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• W2007201787 abstract "In plasma etching for microelectronics fabrication, a sheath electric field accelerates ions into the substrate so they strike at normal incidence, contributing energy and reactive species to enable anisotropic etch profiles. The energy of the bombarding ions is typically controlled coarsely with a sinusoidal bias voltage applied to the substrate electrode, producing a broad bimodal ion energy distribution (IED) at the substrate. By systematically tailoring the shape of the waveform, the energies and relative fluxes of the two IED peaks are varied independently over a 100–500 eV range in a fluorocarbon-based helicon plasma, while silicon dioxide and photoresist etch rates are monitored. A 100 eV IED peak was combined with a higher energy peak, with the energy and relative flux of the high energy group as variables in the experiment. A relatively small contribution of high energy ions is found to lead to considerable etch rate enhancement, higher than predicted by a linear combination of single-peak etch rates at the two energies. Because high energy ion bombardment is known to suppress fluorocarbon deposition, it seems likely that changes in surface chemical composition in their presence enhances the contribution of lower energy ions to etching reactions." @default.
• W2007201787 created "2016-06-24" @default.
• W2007201787 creator A5008629534 @default.
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• W2007201787 date "2009-02-26" @default.
• W2007201787 modified "2023-10-09" @default.
• W2007201787 title "Energy distribution of bombarding ions in plasma etching of dielectrics" @default.
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• W2007201787 doi "https://doi.org/10.1088/0963-0252/18/2/025009" @default.
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