Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.147
Publication date: 7th February 2022
Lead halide perovskites (LHP) nanomaterials have emerged as an exciting new class of semiconductor materials with outstanding electronic and optical properties, easy synthesis, and high photoluminescence quantum yield. Beyond their solar cell application, they have been extensively exploited in diverse fields such as LED technology, laser, and more recently in photocatalysis. [1]
They respond to the general formula APbX3, where A is an organic cation such as methylammonium, formamidinium or inorganic cation such as Cs+, and X is the halide anion (Cl-, Br- or I-). The key role of the organic ligands for surface passivation and colloidal dispersion has been demonstrated in the preparation of the first CH3NH3PbBr3 nanocrystals in 2014, using octylammonium bromide and oleic acid as capping agents. [2] The nature of the organic ligands can determine the dimensionality of the inorganic framework and the dimension of the perovskite material, and therefore their optical properties.
The synthesis of colloidal low dimensional perovskites with deep blue-emissive will be presented. In particular, ultrathin [CsPbBr3]PbBr4 nanoplatelets and pure two-layered L2[CH3NH3PbX3]PbX4 perovskite nanosheets were synthesized by thermal/ultrasound methodology and ligand assisted techniques, respectively. [3, 4] Their emissive properties and chemical/photochemical stability will be discussed. The long-term stability in the solid-state together with the high processability of the colloidal nanosheets enabled the preparation of blue-emissive solid films, which may be suitable for assembling on a large area on-demand and, consequently, be useful for preparing high-quality films for flexible and ultrathin optoelectronic devices, or they could be combined with other types of 2D materials.
Generalitat Valenciana (PROMETEO/2019/080 and IDIFEDER/2018/064)
“Mariade Maeztu” Programme for Units of Excellence in R&D(CEX2019-000919-M)
Spanish MICINN, PID2020-115710GB-I00
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