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Band gap widening with time induced by structural relaxation in amorphous Ge2Sb2Te5 films
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View: Figures


Image of FIG. 1.
FIG. 1.

(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).

Image of FIG. 2.
FIG. 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).

Image of FIG. 3.
FIG. 3.

(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.

Image of FIG. 4.
FIG. 4.

Correlation plot between the optical gap and the Tauc plot slope [square root of AT in Eq. (2)].


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Band gap widening with time induced by structural relaxation in amorphous Ge2Sb2Te5 films