Plasma-assisted etching of tungsten films: A quartz-crystal microbalance study

The plasma-assisted etching of magnetron-sputtered polycrystalline tungsten films in CF4-H2 and CF4-O2 glow discharges has been studied as a function of ion energy using quartz-crystal microbalance methods supplemented by vacuum-transfer Auger electron spectroscopy and actinometric emission spectroscopy.