Highly luminescent perovskite nanoparticles stabilized by natural amino acids

presentation, poster

English

Metal halide perovskite materials have proven to have a promising future in form of semiconducting nanoparticles and nanostructures, where the physical properties can be tuned not only by the chemical stoichiometry but also by the confined size of the particles at the dimensional scale where quantum broadening takes place. Perovskite nanoparticles have already shown their applicability in semiconducting devices such as OLEDs, photodetectors and lasers. Generally, synthesis of colloidal nanoparticles involves stabilizing by the ligands and surfactants. In this regards, ligand-engineering is an important factor to fine tune the nanoparticles processing techniques. However, one of the most efficient ways of ligand engineering is to use the multifunctional materials which would not only interrupt crystallization processes forming the nanoparticles, but also would be functional surface groups. Here, we focus on the synthesis of methylammonium lead bromide nanoparticles stabilized by amino acids, namely L-arginine or L-lysine alongside with various surfactants. Perovskite nanoparticles were prepared by the facile reprecipitation method which results into highly luminescent sub 10 nm nanoparticles formation. Colloidal dispersions emit light within a narrow bandwidth of the visible spectrum and exhibit photoluminescent quantum yields close to 100 %. Amino acids used in the experiment are of biological origin, relatively cheap and abundant. Since we have proved that amino acids can be incorporated into the perovskite structure by their side chains, also oligopeptides/peptides can be used for nanoparticles stabilization, this can provide the final functional devices a lot of significant properties, such as affinity to the desired surfaces, self-assembility and sensing abilities (molecular switches).

Perovskite materials, nanoparticles, amino acids, capping agents

JANČÍK PROCHÁZKOVÁ, A.; SALINAS, Y.; DEMCHYSHYN, S.; YUMUSAK, C.; MÁSILKO, J.; BRÜGGEMANN, O.; WEITER, M.; KALTENBRUNNER, M.; SARICIFTCI, N. S.; KRAJČOVIČ, J.; KOVALENKO, A.

23. 3. 2019

1