Exciton Photophysics of Halide Perovskites for Novel Applications

Halide perovskite semiconductors exhibit unique optical, transport, and thermal properties even at room temperature. High-quality perovskite samples show no light scattering losses, high optical transparency in the visible and near-infrared regions, and efficient photoluminescence with no essential Stokes shift. Therefore, the dynamics of charge carriers, excitons, and spins can be studied using optical spectroscopy. We studied the exciton properties of halide perovskites using nonlinear optical spectroscopy, single dot spectroscopy, and terahertz spectroscopy [1-7]. In this talk, we discuss the exciton-phonon interactions, exciton-exciton interactions, and higher harmonic generation for optical refrigeration, spintronics, and light source applications.<br/><br/>[1] K. Cho <i>et al</i>., <i>Nano Lett.</i> <b>22</b>, 7674 (2022).<br/>[2] T. Handa <i>et al</i>., <i>Sci. Adv.</i> <b>8</b>, eabo1621 (2022).<br/>[3] G. Yumoto <i>et al</i>., <i>Sci. Adv.</i> <b>8</b>, eabp8135 (2022).<br/>[4] G. Yumoto <i>et al</i>., <i>Nature Commun.</i> <b>12</b>, 3026 (2021).<br/>[5] F. Sekiguchi <i>et al</i>., <i>Phys. Rev. Lett.</i> <b>126</b>, 077401 (2021).<br/>[6] Y. Yamada <i>et al</i>., <i>Phys. Rev. Lett.</i> <b>126</b>, 237401 (2021).<br/>[7] Y. Sanari <i>et al</i>., <i>Phys. Rev. B</i> <b>102</b>, 041125(R) (2020).