Speaker
Description
Two-dimensional (2D) perovskites are promising materials for nonlinear optics, photonics, and optoelectronics due to their strong excitonic behavior, quantum confinement, and structural tunability. We investigate second-order nonlinear optical properties of mono- and few-layered (Benzylammonium)2PbX4 (where X = Br, Cl, and I), with our current focus on (Benzylammonium)2PbBr4. Bulk crystals were exfoliated to few-layered nanosheets and characterized their structural and compositional properties using X-ray fluorescence spectroscopy (XRF), X-ray diffraction (XRD), and energy-dispersive spectroscopy/scanning electron microscopy (EDS/SEM). Electronic properties were explored through density of states, band structure analysis, and dielectric response calculations under both independent particle approximation and local field effects. To further examine their optical and nonlinear properties, atomic force microscopy (AFM) will be used to quantify nanosheet thickness, while Raman spectroscopy and transmission electron microscopy (TEM) will provide insight into phonon modes, crystallinity, and structural integrity. Second-harmonic generation (SHG) and photoluminescence (PL) measurements will be performed to probe the nonlinear optical properties and emission characteristics of these materials. Moreover, we are theoretically calculating the second-order susceptibility to complement our experimental findings. Future work will extend these investigations to chloride and iodide analogues, allowing for a broader understanding of the tunable nonlinear optical properties in 2D perovskites for advanced photonic applications.
