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• W1988172344 abstract "The variation in polysilicon plasma etching rates caused by Ti residue on the reactor walls was investigated. The amount of Ti residue was measured using attenuated total reflection Fourier transform infrared spectroscopy with the HgCdTe (MCT) detector installed on the side of the reactor. As the amount of Ti residue increased, the number of fluorine radicals and the polysilicon etching rate increased. However, a maximum limit in the etching rate was observed. A mechanism of rate variation was proposed, whereby F radical consumption on the quartz reactor wall is suppressed by the Ti residue. The authors also investigated a plasma-cleaning method for the removal of Ti residue without using a BCl3 gas, because the reaction products (e.g., boron oxide) on the reactor walls frequently cause contamination of the product wafers during etching. CH-assisted chlorine cleaning, which is a combination of CHF3 and Cl2 plasma treatment, was found to effectively remove Ti residue from the reactor walls. This result shows that CH radicals play an important role in deoxidizing and/or defluorinating Ti residue on the reactor walls." @default.
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• W1988172344 date "2014-11-01" @default.
• W1988172344 modified "2023-09-26" @default.
• W1988172344 title "Evolution of titanium residue on the walls of a plasma-etching reactor and its effect on the polysilicon etching rate" @default.
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• W1988172344 doi "https://doi.org/10.1116/1.4900967" @default.
• W1988172344 hasPublicationYear "2014" @default.
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