Proceedings of Online nanoGe Fall Meeting 20 (OnlineNFM20)
Publication date: 4th October 2020
Among the emerging class of lead halide perovskite nanocrystals (NCs), formamidinium lead iodide (FAPbI3) NCs exhibit the narrowest energy gap, making them promising for solar light harvesting and near-infrared photonics. FAPbI3 NCs are more robust than the red-emitting CsPbI3 NC counterparts, however they still suffer from weak binding of the oleic-acid capping ligands making such NCs prone to sintering in the solid state.1
Herein we implement thermal annealing as a way to accelerate ligand desorption and systematically probe the impact of such treatment on the structural and optical properties of FAPbI3 NC films. We find that annealing up to 95 0C is highly beneficial for the NC emission, resulting in as high as 100% increase of the PL intensity and PL lifetime relative to the untreated NCs. As the temperature increases further, ligand desorption results in bathochromic shifts of the band-edge and micron-scale NC aggregates visible by fluorescence microscopy. At the highest annealing temperature of 155 0C, extended NC sintering and loss of confinement occurs, with a concomitant introduction of interfacial defects that efficiently quench the NC luminescence. Further studies can provide insight on whether the structural lability of perovskite NCs can be transformed into functionality using controlled sintering of the NCs into larger, conductive nanostructures suitable for the active region of optoelectronic devices.
The work was financially supported by the Research and Innovation Foundation of Cyprus, under the "NEW STRATEGIC INFRASTRUCTURE UNITS-YOUNG SCIENTISTS" Program (Grant Agreement No. "INFRASTRUCTURES/1216/0004", Acronym "NANOSONICS").
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