Exploration of structural, thermal stability and band-gap tunability of organic and inorganic mixed cation (MA)1- xCsxPbBr3perovskite harvester via ultrasonication synthesis route

Rajan Kumar Singh; Khalid Bin Masood; Neha Jain; Radha Tamrakar; Jai Singh; Ranveer Kumar

doi:10.1088/1361-648X/abf51d

Exploration of structural, thermal stability and band-gap tunability of organic and inorganic mixed cation (MA)_{1- x}Cs_xPbBr₃perovskite harvester via ultrasonication synthesis route

J Phys Condens Matter. 2021 May 14;33(24). doi: 10.1088/1361-648X/abf51d.

Authors

Rajan Kumar Singh^{1

2}, Khalid Bin Masood², Neha Jain², Radha Tamrakar³, Jai Singh⁴, Ranveer Kumar²

Affiliations

¹ Department of Chemical Engineering, National Taiwan University, Taipei, ROC, Taiwan.
² Department of Physics, Dr. H. S. Gour Central University, Sagar, 470003, M. P., India.
³ Department of Physics, Govt. K. N. M. M., Damoh, M.P., India.
⁴ Department of Pure and Applied Physics, Guru Ghasidas University, Bilaspur, India.

PMID: 33823502
DOI: 10.1088/1361-648X/abf51d

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/CsPbBr₃perovskite 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 MAPbBr₃perovskite structure. Structural study reveals that up to 40% Cs⁺incorporation into MAPbBr₃has purePm-3mcubic 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_0.60Cs_0.40PbBr₃perovskite compound may be a promising candidate.

Keywords: band gap tuning; cation exchange; hybrid perovskite; thermal stability; ultrasonic synthesis.