TY - JOUR
T1 - Evolution of Chemical Structure During Silver Photodiffusion into Chalcogenide Glass Thin Films
AU - Kovalskiy, A.
AU - Jain, H.
AU - Mitkova, Maria
PY - 2009/10/1
Y1 - 2009/10/1
N2 - The change of chemical structure resulting after X–ray and photo-induced silver diffusion into chalcogenide glass (ChG) thin films is monitored by high resolution X-ray photoelectron spectroscopy (XPS). As 40 S 60 and Ge 30 Se 70 thin films, which are based on pyramids and tetrahedral structural units, are investigated as model materials. Survey, core level (As 3 d , S 2 p , Ge 3 d , Ge 2 p , Se 3 d , Ag 3 d 5/2 , O 1 s , C 1s ) and valence band spectra have been recorded and analyzed. Reference point for the binding energy is established by the subsequent deposition of thin gold film on top of the measured samples. The chemical structure gradually changes during diffusion of silver in all the samples. The mechanism of change depends on the chemical composition, thickness of the diffused silver layer and conditions of irradiation. It is revealed that surface oxygen can play important role in the Ag photodiffusion process, leading to phase separation on the surface of the films. Photodiffusion of Ag into As 40 S 60 film leads to the formation of a uniform ternary phase and arsenic oxides on the surface. The formation of ethane-like Ge 2 (S 1/2 ) 6 units together with germanium oxidation are the main outcomes of X-ray induced Ag diffusion into Ge 30 Se 70 film.
AB - The change of chemical structure resulting after X–ray and photo-induced silver diffusion into chalcogenide glass (ChG) thin films is monitored by high resolution X-ray photoelectron spectroscopy (XPS). As 40 S 60 and Ge 30 Se 70 thin films, which are based on pyramids and tetrahedral structural units, are investigated as model materials. Survey, core level (As 3 d , S 2 p , Ge 3 d , Ge 2 p , Se 3 d , Ag 3 d 5/2 , O 1 s , C 1s ) and valence band spectra have been recorded and analyzed. Reference point for the binding energy is established by the subsequent deposition of thin gold film on top of the measured samples. The chemical structure gradually changes during diffusion of silver in all the samples. The mechanism of change depends on the chemical composition, thickness of the diffused silver layer and conditions of irradiation. It is revealed that surface oxygen can play important role in the Ag photodiffusion process, leading to phase separation on the surface of the films. Photodiffusion of Ag into As 40 S 60 film leads to the formation of a uniform ternary phase and arsenic oxides on the surface. The formation of ethane-like Ge 2 (S 1/2 ) 6 units together with germanium oxidation are the main outcomes of X-ray induced Ag diffusion into Ge 30 Se 70 film.
KW - XPS
KW - chalcogenides
UR - https://scholarworks.boisestate.edu/electrical_facpubs/43
U2 - 10.1016/j.jnoncrysol.2008.12.021
DO - 10.1016/j.jnoncrysol.2008.12.021
M3 - Article
SN - 0022-3093
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
ER -