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- W2067828049 abstract "Environmentally benign etching process of amorphous silicon (a-Si) and tungsten (W) by using a plasma process with an evaporation of solid materials system has been developed for replacing a conventional plasma process using green house gases, such as SF6 gas and perfluorocompound gases causing global warming. The evaporation system was designed to generate fluorocarbon species from solid materials by a CO2 laser irradiation. An electron cyclotron resonance (ECR) plasma using O2 accompanied with injection of species evaporated from solid materials has been applied to a-Si and W etching for cleaning process in chemical vapor deposition chamber. Fluorinated ethylene propylene (FEP) and polytetrafluoroethylene (PTFE) are selected as the solid material and the etching characteristics between FEP and PTFE have been compared. Furthermore, the etching of a-Si and W films has been performed in the divergent magnetic field ECR downstream plasma [electron density (ne); ∼1010 cm−3, electron temperature (Te); 1.5–2.8 eV] and a planar ECR plasma [ne; ∼1010 cm−3, Te; 3.4–4.4 eV] using O2 gas with FEP evaporation. As a result, high etching rates of a-Si and W films of above 100 nm/min were successfully obtained at a substrate temperature of 400 °C in the planar ECR plasma of higher electron temperature. CFx (x=1–3) radical densities and F atom density in plasmas were measured by an infrared diode laser absorption spectroscopy and an actinometric optical emission spectroscopy, respectively. On the basis of these measurements of species, the etching mechanisms of a-Si and W films are discussed." @default.
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- W2067828049 date "2002-12-23" @default.
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- W2067828049 title "Environmentally benign etching process of amorphous silicon and tungsten using species evaporated from polytetrafluoroethylene and fluorinated ethylene propylene" @default.
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- W2067828049 doi "https://doi.org/10.1116/1.1531131" @default.
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