Schematic illustration of the studied compositionally graded BST thin films with layers. denotes the compositional concentration in th layer and the direction is perpendicular to the film surface.
Normalized polarization with respect to average polarization as a function of position at a given temperature . (a) and (b) correspond to the up-graded structure and the down-graded structure, respectively.
Normalized polarization profile along the direction at the different temperatures , for a down-graded thin film with a fixed .
Temperature dependence of the mean polarization for different compositional gradients. (a) and (b) depict the up-graded film with and the down-graded film with , respectively.
Calculated charge offset as a function of the concentration in a down-graded structure for the different temperatures .
Variations of the pyroelectric coefficient as a function of temperature for the different concentrations in the case of up-graded film.
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