The surface reaction on SrBi2Ta2O9 thin films etched in Cl2/CF4/Ar inductively coupled plasma
SrBi2Ta2O9 thin films were etched in high-density Cl2/CF4/Ar in inductively coupled plasmas. The chemical reactions on the etched surface were studied using X-ray photoelectron spectroscopy and secondary ion mass spectrometry. The etching of SBT thin films in Cl2/CF4/Ar was eroded by chemically-assisted reactive ion etching. The maximum etch rate was 1060 /min in 20% Cl2 in Cl2/CF4/Ar. The addition of a small amount of Cl2 to CF4/Ar plasma decreases the concentration of fluorine radicals and increases that of Cl radicals. We obtained an etch profile of over 80 and a clean surface.
srbi2ta2o9 inductively coupled plasma (icp) x-ray photoelectron spectroscopy (xps) secondary ion mass spectrometry (sims) plasma etching