TY - JOUR
T1 - Raman evidence for surface oxidation of amorphous As2S3 thin films under ultraviolet irradiation
AU - Azhniuk, Yuriy
AU - Solonenko, Dmytro
AU - Loya, Vasyl
AU - Grytsyshche, Iaroslav
AU - Lopushansky, Vasyl
AU - Gomonnai, Alexander V.
AU - Zahn, Dietrich R. T.
PY - 2019/2/15
Y1 - 2019/2/15
N2 - Amorphous As2S3 films with surface roughness near 0.5 nm were prepared by thermal evaporation. Raman measurements performed under ultraviolet (UV) laser excitation (325 nm) revealed a series of sharp intense peaks appearing at laser power density Pexc above 150 kW/cm2. No such effects were observed at Raman measurements under visible (514.7 or 632.8 nm) light excitation, even for much higher Pexc values. The new Raman peaks are identified as arsenolite (As2O3) features. UV light-assisted oxidation of the As2S3 surface is discussed.
AB - Amorphous As2S3 films with surface roughness near 0.5 nm were prepared by thermal evaporation. Raman measurements performed under ultraviolet (UV) laser excitation (325 nm) revealed a series of sharp intense peaks appearing at laser power density Pexc above 150 kW/cm2. No such effects were observed at Raman measurements under visible (514.7 or 632.8 nm) light excitation, even for much higher Pexc values. The new Raman peaks are identified as arsenolite (As2O3) features. UV light-assisted oxidation of the As2S3 surface is discussed.
M3 - Article
VL - 467
SP - 119
EP - 123
JO - Applied Surface Science
JF - Applied Surface Science
ER -