Strong Optical, Electrical, and Raman in-Plane Anisotropy in Corrugated Two-Dimensional Perovskite

Lekina, Y., Febriansyah, B., Fan, X. , You, L., Morris, S., Wang, J., England, Jason, Huang, X., Yan, J. and Shen, Z.X. (2021) Strong Optical, Electrical, and Raman in-Plane Anisotropy in Corrugated Two-Dimensional Perovskite. Journal of Physical Chemistry C, 125 (41). pp. 22630-22642. ISSN 1932-7447

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Combining the unique properties of hybrid halide perovskites and in-plane anisotropic potential of two-dimensional materials, corrugated layered perovskites are excellent candidates for novel optoelectronic devices. Here, we report strong in-plane anisotropy in a two-dimensional hybrid halide perovskite with corrugated inorganic sheets. We assigned the angle-dependent Raman spectra to particular orientations of the crystals where the method applied is suitable for fast determination of the in-plane crystallographic axes. We demonstrated strong in-plane anisotropy of the optoelectronic properties: electrical measurements showed that changes of photoconductivity and angle-resolved reflectance spectroscopy exhibited variation of the band structure. Employing first-principles calculations, we confirmed the observed anisotropy of the dielectric response. Photoluminescence spectroscopy revealed an anomalous energy shift of ∼20 meV dependent on the relative orientation of the crystals and polarization of the excitation light. Using temperature-dependent analysis of the photoluminescence spectra, we obtained the anisotropic exciton-phonon coupling strength as well as the angle-dependent average phonon energy involved, which contributes to the shift of the photoluminescence peak maximum. This discovery of the in-plane anisotropic behavior in layered 2D perovskites could be expected to spur new functionalities in optical and optoelectronic device applications.

Keywords:Anisotropy, Calculations, Crystal orientation, Hybrid materials, Optoelectronic devices, Phonons, Photoluminescence, Angle-dependent, Anisotropic potential, Halide perovskites, In-plane anisotropy, Layered perovskite, Optical Raman, Optoelectronics devices, Property, Two-dimensional, Two-dimensional materials, Perovskite
Subjects:F Physical Sciences > F200 Materials Science
F Physical Sciences > F120 Inorganic Chemistry
F Physical Sciences > F360 Optical Physics
Divisions:College of Science > School of Chemistry
ID Code:51887
Deposited On:04 Oct 2022 09:20

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