Physical and optical modulation of quasi-two-dimensional lead halide hybrid perovskites materials

Li-Ming Chiang^1,2*, Yi-Ling Hsieh¹, Tsung-Sheng Kao¹, Min-Hsiung Shih²

¹Department of Photonics, National Yang Ming Chiao Tung University, Hsinchu, Taiwan
²Research Center for Applied Sciences, Academia Sinica, Taipei, Taiwan

* Presenter:Li-Ming Chiang, email:k2584627@gmail.com

Cation doping in two-dimensional perovskite materials can change the cation chain length between layers. Through the doping of cations, the layered perovskites will be staggered and stacked to form a quasi-two-dimensional perovskite structure. The quasi-two-dimensional perovskite structure has many tunable properties, including energy band structure, quantum efficiency, light absorption coefficient, etc. These properties can be regulated by adjusting organic cations, metal anions, halogens, stacking layers number, etc. Since its outermost layer is a long-chain organic cation, it has better hydrophobicity than other dimensional perovskites. In this work, we demonstrated the optical and physical properties of hybrid BA(MA)n-1PbnI3n+1 perovskite by doping methylamine in BA2PbI4. In addition, we also analyzed the effect of different formation environments on perovskite by changing the solvent and annealing conditions when synthesizing materials. With the increase of doping concentration, we observed that the emission wavelength of photoluminescence gradually shifted red from 523 nm to 760 nm. It was also observed from the X-ray diffraction spectrum that the lattice structure gradually changed from cubic to tetragonal. The luminescence properties and lattice structures at high concentrations are similar to the typical three-dimensional methylamino lead iodide, indicating that the properties of quasi-2D perovskite will approach three-dimensional perovskite at high doping concentration.

Keywords: Quasi-two-dimensional perovskite, photoluminescence, lattice structure