Exploration of structural, thermal stability and band-gap tunability of organic and inorganic mixed cation (MA) 1− x Cs x PbBr 3 perovskite harvester via ultrasonication synthesis route

Abstract Extensive investigation over the last few years has been done on halide based perovskite light harvester due to higher power conversion efficiency but the thermal stability with organic cation i.e. methylamine is challenging for the commercialization. Therefore, for improved structural and thermal stability, it is significant to develop a mixed cation base perovskite compound. To improve the thermal and structural stability of the material and easy synthesis method for industrialization of the material, we have demonstrated the compositional engineering of MA/CsPbBr 3 perovskite material via ultrasonication synthesis process. The x-ray diffraction, transmission electron microscope, diffuse reflectance spectrometer and simultaneous thermal analyzer (STA) analysis were performed in order to understand the impact of the Cs + into MAPbBr 3 perovskite structure. Structural study reveals that up to 40% Cs + incorporation into MAPbBr 3 has pure Pm −3 m cubic phase of perovskite compound with continuously increase in micro strain and lattice contraction. On the other hand, with increasing the concentration of Cs + than MA + , optical band gap slightly increases. The thermodynamic behavior and thermal stability of the sample was studied with STA (differential scanning calorimetry/thermogravimetry). For the new generation optoelectronics with admirable stability, we believe that pure phase MA 0.60 Cs 0.40 PbBr 3 perovskite compound may be a promising candidate.