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• W2026493917 startingPage "871" @default.
• W2026493917 abstract "Addition of CF4 into HBr-based plasma for polycrystalline–silicon gate etching reduces the deposition of an etch byproduct, silicon oxide, onto the chamber wall but tends to generate organic polymer. In this work, a detailed study has been carried out to analyze the mechanism of polymerization and to characterize the polymer composition and quantity. The study has shown that the polymer formation is due to the F-radical depletion by H atoms dissociated from HBr. The composition of the polymer changes significantly with CF4 concentration in the gas feed, and the polymer deposition rate depends on CF4% and other process conditions such as source power, bias power, and pressure. Surface temperature also affects the polymer deposition rate. Adding O2 into the plasma can clean the organic polymer, but the O2 amount has to be well controlled in order to prevent the formation of silicon oxide. Based on a series of tests to evaluate polymer deposition and oxide cleaning with O2 addition, an optimized process regime in terms of O2-to-CF4 ratio has been identified to simultaneously suppress the polymer and oxide deposition so that the etch process becomes self-cleaning." @default.
• W2026493917 created "2016-06-24" @default.
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• W2026493917 date "2001-05-01" @default.
• W2026493917 modified "2023-10-14" @default.
• W2026493917 title "Fluorocarbon polymer formation, characterization, and reduction in polycrystalline–silicon etching with CF4-added plasma" @default.
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• W2026493917 doi "https://doi.org/10.1116/1.1367262" @default.
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