arXiv Materials Science
arXiv Materials Science
4 years ago

Exciton binding energy of CH3NH3PbX3 under low magnetic field: implications of strong exciton-phonon coupling. (arXiv:2001.07901v1 [cond-mat.mtrl-sci])

Yasuhiro Yamada, Hirofumi Mino, Takuya Kawahara, Kenichi Oto, Hidekatsu Suzuura, Yoshihiko Kanemitsu
Lead halide perovskites are a fascinating class of materials for a wide range of applications because of their unique optoelectronic features. In spite of the recent discussions on the strong electron-phonon coupling of halide perovskites, its effects on the excitonic properties are not yet completely understood. Here, we investigate the exciton binding energies of CH3NH3PbX3 [X = I, Br, and Cl] under weak magnetic fields below 7 T where the cyclotron energy is sufficiently small compared with LO phonon energy and exciton Rydberg energy. Highly sensitive magneto-reflectance spectroscopy was employed to detect the high-order exciton Rydberg states and Landau levels. The larger reduced masses and smaller exciton binding energies under the lower magnetic field suggest the strong exciton-phonon coupling. We discuss the field-dependent excitonic properties in terms of phonon screening effect and derive the polaronic and excitonic material parameters that can account for the magneto-optical properties of lead halide perovskites.

Publisher URL: http://arxiv.org/abs/2001.07901

DOI: arXiv:2001.07901v1

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