Abstract
Organometal perovskite nanocrystals have shown remarkable properties not only in photovoltaics, but also in light-emitting devices. In this work colloidal nanocrystals of organometal perovskite CH3NH3PbBr3 (MAPBr) with effective visible photoluminescence were synthesized by the ligand assisted reprecipitation method. The studies were carried out by photoluminescence spectroscopy and optical transmission spectroscopy. Analysis of the photoluminescence and transmission spectra showed that by changing the concentration of the ligands oleylamine and octylamine, it is possible to control the size of nanocrystals and the photoluminescence wavelength due to the quantum confinement effect. It was shown that the increase in ligands concentration in MAPBr perovskite nanocrystals (NCs) solutions decreases the width of the peak which indicates a better quality of the obtained nanocrystals. An increase in the band gap indicates a decrease in the size of the nanocrystals. Replacing the ligands in the colloidal perovskite NCs solutions leads to shift of the photoluminescence peak from 456 to 535 nm.
Highlights
Over the past decade ABX3 organometal perovskites have shown rapid growth in optoelectronic applications
methylammonium lead bromide perovskite NCs CH3NH3PbBr3 (MAPBr) perovskite NCs were synthesized by the colloidal ligand-assisted reprecipitation (LARP) method
One can see that perovskite NCs are characterized by a cubic-like shape with average sizes of 5‒130 nm for the samples prepared with different amounts of ligands
Summary
Over the past decade ABX3 (where А – Cs+, NH2CHNH2+ or CH3NH3+; В – Sn2+ or Pb2+; Х – Cl–, Br– or I–) organometal perovskites have shown rapid growth in optoelectronic applications. The supersaturation state can be achieved by changing the temperature (cooling the solution), evaporating the solvent, or adding a co-solvent with low ions solubility Under these conditions spontaneous precipitation and crystallization reactions occur until the system reaches equilibrium again. If this process is carried out in the presence of ligands, it is called ligand-assisted reprecipitation. It is easy to understand that since the synthesis by the LARP method (as opposed to the HI methods) is carried out in air using a simple chemical apparatus it can be scaled This advantage allows the organization the production of perovskite NCs in large quantities [10,11,12]
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