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Title: Temperature-induced orbital polarizations and tunable charge dynamics in layered double perovskite thin films
Authors: Arramel
Maddalena, Francesco
Muhammad Haris Mahyuddin
Yin, Xinmao
Tang, Chi Sin
Mohammad Kemal Agusta
Muhammad Fauzi Sahdan
Diao, Caozheng
Dang, Cuong
Muhammad Danang Birowosuto
Wee, Andrew Thye Shen
Rusydi, Andrivo
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2022
Source: Arramel, Maddalena, F., Muhammad Haris Mahyuddin, Yin, X., Tang, C. S., Mohammad Kemal Agusta, Muhammad Fauzi Sahdan, Diao, C., Dang, C., Muhammad Danang Birowosuto, Wee, A. T. S. & Rusydi, A. (2022). Temperature-induced orbital polarizations and tunable charge dynamics in layered double perovskite thin films. Materials Today Energy, 24, 100921-.
Project: MOE2014-T3-1-004
Journal: Materials Today Energy
Abstract: The realization of lead-free all-inorganic perovskites in emergent materials requires an in-depth understanding of strongly correlated systems toward optoelectronics or spintronics applications. Herein, we report the electronic and optical variation of the <111>-oriented layered double perovskites (LDP) family with the formula of Cs4MIIBi2Br12 thin films (where MII: Cu, Mn, Pb, or Sr). The element and shell-specific orbital polarization based on soft X-ray linear dichroism spectroscopy probes the Cs M4,5- and Mn L2,3- edges of Cs4MnBi2Br12 thin films as a function of temperature. A strong reversal orbital polarization at the respective edges at 150 K indicates a thermally induced orbital-selective rearrangement at low temperature. In addition, the valence band analysis indicates different orbital admixtures of Br 4p and MII d states, corroborated by the density functional theory calculations. In terms of the transient charge dynamics, we observe the photoluminescence peak maxima position trend line is shifted toward a longer wavelength. In addition, the longest average lifetime is recorded for Cs4CuBi2Br12 at 27.40 ± 1 μs. As the LDP structural integrity is lead-free, therefore, these all-inorganic perovskites hold promising potentials as sustainable and green materials for photophysics applications.
ISSN: 2468-6069
DOI: 10.1016/j.mtener.2021.100921
Rights: © 2021 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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