Controlling mechanical, structural, and optical properties of Al2O3 thin films deposited by plasma-enhanced atomic layer deposition with substrate biasing

V. Beladiya, T. Faraz, W.M.M. Kessels, A. Tünnermann, A. Szeghalmi

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Complex interference multilayer systems typically implemented in high-performance optics consists of several layers of low and high refractive index materials. Low mechanical stress of the coatings is desired to avoid cracking and delamination of the film or a deformation of the substrate. It is known that the ion energies in plasma-assisted deposition can be employed to control material properties and thereby mechanical stress. In this study, we evaluate the influence of substrate biasing on mechanical stress and optical properties of alumina (Al2O3) coatings deposited by plasma enhanced atomic layer deposition (PEALD). Substrate biasing up to -300 V was applied during O2 plasma exposure in the second step of a two-step PEALD process. To distinguish the physical effect of ion bombardment from the physico-chemical effect, a substrate bias of -100 V was applied separately and only during Ar plasma exposure that constituted the third step of a three-step PEALD process. Al2O3 films were characterized using spectroscopic ellipsometry, spectrophotometry, xray photoelectron spectroscopy (XPS), x-ray diffractometry (XRD), x-ray reflectometry (XRR), Fourier transform infrared spectroscopy (FT-IR), wafer-curvature measurement and atomic force microscopy (AFM).

Originele taal-2Engels
TitelAdvances in Optical Thin Films VI
UitgeverijSPIE
ISBN van geprinte versie9781510619197
DOI's
StatusGepubliceerd - 1 jan 2018
EvenementAdvances in Optical Thin Films VI 2018 - Frankfurt, Duitsland
Duur: 14 mei 201817 mei 2018

Publicatie series

NaamProceedings of SPIE
Volume10691

Congres

CongresAdvances in Optical Thin Films VI 2018
LandDuitsland
StadFrankfurt
Periode14/05/1817/05/18

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