Abstract
Ternary nanophases based on Cs–Pb–X (X=Br, Cl, I) composition, were evidenced in polycrystalline thin films grown by physical vapour deposition. Optical properties of these nanostructures were determined by absorption, emission and decay kinetics measurements. Nanocrystals of CsPbX 3 type were found to be in agreement with reported band-structure calculations (X=Cl, Br); they show optical features of a wide band-gap semiconductor with direct band-to-band transitions. Ternary bromide and chloride phases show, at 10 K, a pronounced fast free Wannier exciton emission (leading decay time <1 ns) peaking round 537 and 420 nm, respectively, with very small Stokes-shift. On the contrary, the nanophase of CsPbI 3 is characterised by the auto-localised exciton emission around 535 nm, longer decay times in μs time scale and a pronounced Stokes-shift. In all the cases, the optical features are closely similar to the ones of the bulk ternary crystals, which were reported earlier.
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