Optical, Morphological and Structural Properties of Hybrid CH3NH3PbBr3Perovskite Thin Films Deposited via a Single Step Spin-Coating Process

Tineo-Soto J.E.; Morales-Acevedo A. · CCE 2022 - 2022 19th International Conference on Electrical Engineering, Computing Science and Automatic Control (2022) · DOI: 10.1109/cce56709.2022.9975890

Resumen

Methylammonium lead tribromide (MAPbBr3) has attracted great attention within the field of metal-organic halide perovskite research due to its potential optoelectronic applications, as well as offering higher stability compared to iodine-based perovskites. In this work we report the preparation of MAPbBr3 perovskite thin films, using a one-step spin-coating deposition process using different molar concentration ratios of the PbBr2 and MABr precursors, dissolved in dimethyl sulfoxide and dimethylformamide at ambient conditions. The transmittance measurement by UV-Vis allowed the determination of an effective bandgap in the range of 2.23 eV to 2.29 eV. Scanning electron microscopy analysis showed that the excess of any of the precursors causes a larger crystallite size compared to the equimolar solution, but at the expense of an increase in the film inhomogeneity. Then, it is concluded that, in this case, the 1:1 precursor concentration ratio is the best since it allows the deposition of stable, compact, and homogeneous layers with high photoluminescence (at room temperature) in the 'green' wavelength region.

Instituciones: Universidad Nacional Pedro Ruiz Gallo