Diffusion-induced enhanced photoresponsivity and detectivity in an Ag 2 S/In 2 Se 3 heterostructure for a UV-visible photodetector: an experimental and computational analysis

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= 6.35 s) were moderate and well-balanced, suggesting efficient charge separation and recombination kinetics. The bandgap of the annealed film increased with reduction in structural disorder, as evidenced by UV-visible spectroscopy and well supported by DFT results. The amorphous to polycrystalline phase transformation induced a change in surface morphology and reduced the contact angle, thereby decreasing hydrophobicity. The refractive index decreased with an increase in optical transmission and skin depth, while optical density reduced upon annealing. X-ray photoelectron spectroscopy revealed the oxidation states of the elements, while energy-dispersive X-ray analysis presented the elemental composition of the films. The heterostructure formation and its mixing upon annealing were evident from the cross-sectional FESEM images, and the presence of the planes was confirmed through HRTEM images. The observed optical properties, along with enhanced photodetection, pave the way toward the construction of novel III-VI metal chalcogenide-based heterojunctions for high-performance and broadband photodetectors.

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