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(Color online) Real (left) and imaginary (right) part of the dielectric function for both the as deposited α-GST film (black) and after 173 h (red) derived from ellipsometric measurements as a function of the photon Energy [eV], E in Eq.(2).
(Color online) ε2 from Fig. 1 multiplied by the square root of the photon energy [eV], E in Eq. (2), that is, the Tauc plot in the low energy range for both the as deposited and the aged film. A blue shift of the onset energy of the ε2(E) after 173 h is observed, leading to a higher optical gap estimation (dashed lines).
(Color online) Time widening of EG extracted from the Tauc plots as in Fig. 2 for the seven acquisition times, exponentially separated, between 1 min and 173 h. Dashed line represents the calculated activation energy increasing with time accordingly Eq. (4) showing a good agreement with trend of the experimental data.
Correlation plot between the optical gap and the Tauc plot slope [square root of AT in Eq. (2)].
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