Refined Calculations of Effective Attenuation Lengths for SiO2 Film Thicknesses by X-Ray Photoelectron Spectroscopy
Cedric J. Powell, W S. Werner, W Smekal
We report electron effective attenuation lengths (EALs) for SiO2 films on Si that were obtained from Monte Carlo simulations of substrate Si 2p3/2 photoelectron transport for X-ray photoelectron spectroscopy (XPS) with Al and Mg Ka X-rays and SiO2 films of varying thickness. These EALs show a stronger dependence on SiO2 thickness than previous values found from an approximate algorithm. Since recent XPS data for SiO2 can be analyzed satisfactorily with thickness-independent EALs, our results indicate that intrinsic excitations and/or variations of inelastic-scattering probabilities near surfaces and interfaces appear to be significant in quantitative XPS.
Applied Physics Letters
attenuation lengths, electron attenuation lengths, film thickness, silicon dioxide, X-ray Photoelectron Spectroscopy
, Werner, W.
and Smekal, W.
Refined Calculations of Effective Attenuation Lengths for SiO<sub>2</sub> Film Thicknesses by X-Ray Photoelectron Spectroscopy, Applied Physics Letters
(Accessed May 29, 2023)