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• W1541821939 startingPage "2197" @default.
• W1541821939 abstract "Etching yields of silicon in F2, Cl2, Br2, and HBr high density plasmas have been measured as a function of ion bombardment energy, ion bombardment angle, and plasma composition. This information contributes to a database of experimental values needed for feature profile evolution modeling. For all plasma chemistries, the etching yield increases approximately with the square root of ion energy. Pure Cl2 and pure HBr plasmas have very similar etching yields. Silicon etching rates are lower in HBr plasmas than in Cl2 plasmas due to lower ion fluxes, not lower etching yields. The dependence of the etching yield on ion bombardment angle is significantly different for Cl2 and HBr plasmas. The etching yield in Cl2 plasmas decreases rapidly for ion angles above 60° (measured from the surface normal), which results in significant ion scattering from the sidewalls, and may cause the sidewall bowing and microtrenching seen when patterning polysilicon with Cl2 plasmas. The etching yield in HBr plasmas decreases more gradually with the ion angle, resulting in less ion reflection from the feature sidewalls and may explain the much less pronounced sidewall bowing and microtrenching typically seen when patterning polysilicon with HBr plasmas. HBr plasmas have higher etching yields than Br2 plasmas due to the ability of H atoms to increase the surface coverage and penetrate farther into the silicon lattice. As the temperature of the silicon increases, the etching yield in HBr plasmas decreases, due to the reduced surface coverage by adsorbed Br and H atoms." @default.
• W1541821939 created "2016-06-24" @default.
• W1541821939 creator A5017477007 @default.
• W1541821939 creator A5020303193 @default.
• W1541821939 creator A5021901576 @default.
• W1541821939 date "2001-09-01" @default.
• W1541821939 modified "2023-09-27" @default.
• W1541821939 title "Silicon etching yields in F2, Cl2, Br2, and HBr high density plasmas" @default.
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• W1541821939 doi "https://doi.org/10.1116/1.1378077" @default.
• W1541821939 hasPublicationYear "2001" @default.
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