Please use this identifier to cite or link to this item: https://doi.org/10.1103/PhysRevX.8.021034
Title: Importance of Electronic Correlations and Unusual Excitonic Effects in Formamidinium Lead Halide Perovskites
Authors: Whitcher, TJ 
Zhu, J-X
Chi, X 
Hu, H
Zhao, Daming
Asmara, TC 
Yu, X. 
Breese, MBH 
Neto, AH Castro 
Lam, YM
Wee, ATS 
Chia, Elbert EM
Rusydi, A 
Keywords: Science & Technology
Physical Sciences
Physics, Multidisciplinary
Physics
TANDEM SOLAR-CELLS
PHOTOVOLTAIC CELLS
EFFECTIVE MASSES
SPECTRAL-WEIGHT
BINDING-ENERGY
PERFORMANCE
DEPOSITION
STABILITY
SYSTEMS
IODIDE
Issue Date: 8-May-2018
Publisher: AMER PHYSICAL SOC
Citation: Whitcher, TJ, Zhu, J-X, Chi, X, Hu, H, Zhao, Daming, Asmara, TC, Yu, X., Breese, MBH, Neto, AH Castro, Lam, YM, Wee, ATS, Chia, Elbert EM, Rusydi, A (2018-05-08). Importance of Electronic Correlations and Unusual Excitonic Effects in Formamidinium Lead Halide Perovskites. PHYSICAL REVIEW X 8 (2). ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevX.8.021034
Abstract: © 2018 authors. Published by the American Physical Society. Hybrid inorganic-organic perovskites have recently attracted much interest because of both rich fundamental sciences and potential applications such as the primary energy-harvesting material in solar cells. However, an understanding of electronic and optical properties, particularly the complex dielectric function, of these materials is still lacking. Here, we report on the electronic and optical properties of selective perovskites using temperature-dependent spectroscopic ellipsometry, X-ray absorption spectroscopy supported by first-principles calculations. Surprisingly, the perovskite FA0.85Cs0.15PbI2.9Br0.1 has a very high density of low-energy excitons that increases with increasing temperature even at room temperature, which is not seen in any other material. This is found to be due to the strong, unscreened electron-electron and partially screened electron-hole interactions, which then tightly connect low- A nd high-energy bands caused by doping.
Source Title: PHYSICAL REVIEW X
URI: https://scholarbank.nus.edu.sg/handle/10635/155057
ISSN: 21603308
DOI: 10.1103/PhysRevX.8.021034
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