DOI: https://doi.org/10.29363/nanoge.emlem.2022.058
Publication date: 15th July 2022
Halide perovskite nanocrystals (PNCs) are prominent and interesting nanomaterials for actively studying photovoltaics, optoelectronics, photonics, and solar-driven chemistry. Valuable features including easy preparation, narrow width at half-maximum photoluminescence (PL) peak, adjustable/modifiable surface chemistry, a notable PL quantum yield (PLQY) of up to 100%, and a modulable band gap have been exploited to fabricate highly efficient devices such as PNC solar cells and multiple color light-emitting diodes (LEDs). Despite of above benefits of the PNCs, the PLQY and material quality are limited by their defective structure, making them prone to degradation. Factors such as (i) synthetic protocols for the PNCs formation and (ii) the loss of capping ligands from PNCs surface are pivotal to create a defective structure. In both cases, halide deficiency is the main reason to cause the appearance of a high density of nonradiative recombination sites, reducing the stability of the final product, and hindering the effective extraction of charge carriers. To overcome these drawbacks, we have analyzed the influence of the synthesis temperature, ligand concentration and metal doping engineering on the enhancement of the photophysical properties, stability, and suppression of non-radiative carrier traps of red-emitting APbI3 (A= Cs+, FA+) PNCs. By establishing an efficient surface passivation through ligand coverage [1] and the incorporation of Sr to substitute Pb during the PNCs synthesis [2], less defective PNCs are formed, with long-term stability around 15 months, providing a pure deep red tonality. Therefore, it is possible to produce excellent candidates to improve the performance of optoelectronic devices and to conduct lead solar driven processes more efficiently.
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