Tuning the structural, optical and photoluminescence properties of hybrid perovskite quantum dots by A-site doping

Abstract

Hybrid organic-inorganic perovskites have been widely investigated in recent years due to their role as light absorbers in highly efficient solar cells and as emitters. Consequently, to control the emission properties of perovskite quantum dots (PQDs) is of great interest. In this study, Csx MA(1-x) PbI3 PQDs were synthesized. A shift in the emission peak from 670 to 740 nm was found for x≥0.2, and the quantum yield (QY) and recombination lifetime were affected when Cs was incorporated. The shift in the emission is observed to be due to the displacement of the valence band edge, but this is not because of an electronic effect resulting from the Cs incorporation, as observed from the PDOS analyses. It is likely due to the transition from tetragonal to orthorhombic phase of the PQDs when the Cs amount increased. Therefore, the emission properties of the PQDs synthesized can be regulated according to the amount of Cs incorporated in their network.