Enhanced photoresponsivity and sensitivity in Ag/Bi<sub>2</sub>Te<sub>3</sub> heterostructure films for visible light photodetectors.

The optical electronegativity ( η opt ), as determined from the Duffy relation, with C = 25.54, suggests a decreasing trend with annealing. 64 The value decreased from 1.642 to 1.630 upon annealing at 250 °C ( Table 3 ), indicating annealing-induced modifications in the bonding characteristics of the thin film.

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The results, as illustrated in Table 2 , show an increasing trend upon annealing.

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