Photo-dependence of sub-T_grelaxation in a-Se thin films

Photostructural relaxation in As–Se–S glasses: Effect of network fragility

“…1). As the glass enthalpy line is lowered during relaxation the fictive temperature decreases [26]. This temperature can be obtained from the DSC trace using the construction shown in the inset of Fig.…”

Light-assisted physical aging in chalcogenide glasses: Dependence on the wavelength of incident photons

“…24 Using conventional differential scanning calorimetry (DSC) technique, they have recorded for amorphous Se films (6 lm thickness) an unusual increase in the relaxation rate under the above-bandgap light exposure (404, 546, and 643 nm wavelengths): the highest value of photorelaxation was achieved with 404 nm light, which had the lowest penetration depth into material (;0.04 lm). 24 It was assumed that photoinduced excitations in the form of valence alternation pairs (VAPs) diffused from the surface layers, where they had been created by light illumination, into the rest bulk of the investigated film effectively promoting physical aging effect as probed by DSC. 24 Later on, similar wavelengths dependence of photostructural relaxation induced by the above-bandgap light exposure (404, 546, 581, and 643 nm wavelengths) was reported for Ge x Se l00Àx films (5-lm thickness).…”

“…24 It was assumed that photoinduced excitations in the form of valence alternation pairs (VAPs) diffused from the surface layers, where they had been created by light illumination, into the rest bulk of the investigated film effectively promoting physical aging effect as probed by DSC. 24 Later on, similar wavelengths dependence of photostructural relaxation induced by the above-bandgap light exposure (404, 546, 581, and 643 nm wavelengths) was reported for Ge x Se l00Àx films (5-lm thickness). 25 The conclusion was made about the significant role of Se chains, which again was considered as a main source of VAPs created by the illumination.…”

Chaotic behavior of light-assisted physical aging in arsenoselenide glasses

“…[5][6][7][8][9] Numerous investigations were focused on compositional trends of light-assisted physical aging (PhA) in ChG, [9][10][11][12][13][14][15][16][17][18][19] a specific type of below-T g structural relaxation caused by sub-band-gap light exposure.…”