Importance of Electronic Correlations and Unusual Excitonic Effects in Formamidinium Lead Halide Perovskites
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 diel...
| Main Authors: | , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2018-05-01
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| Series: | Physical Review X |
| Online Access: | http://doi.org/10.1103/PhysRevX.8.021034 |
| _version_ | 1818825178618003456 |
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| author | T. J. Whitcher J.-X. Zhu X. Chi H. Hu Daming Zhao T. C. Asmara X. Yu M. B. H. Breese A. H. Castro Neto Y. M. Lam A. T. S. Wee Elbert E. M. Chia A. Rusydi |
| author_facet | T. J. Whitcher J.-X. Zhu X. Chi H. Hu Daming Zhao T. C. Asmara X. Yu M. B. H. Breese A. H. Castro Neto Y. M. Lam A. T. S. Wee Elbert E. M. Chia A. Rusydi |
| author_sort | T. J. Whitcher |
| collection | DOAJ |
| description | 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 FA_{0.85}Cs_{0.15}PbI_{2.9}Br_{0.1} 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- and high-energy bands caused by doping. |
| first_indexed | 2024-12-19T00:07:38Z |
| format | Article |
| id | doaj.art-7e22da13ac4d4fc19bd26e2542348a1b |
| institution | Directory Open Access Journal |
| issn | 2160-3308 |
| language | English |
| last_indexed | 2024-12-19T00:07:38Z |
| publishDate | 2018-05-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review X |
| spelling | doaj.art-7e22da13ac4d4fc19bd26e2542348a1b2022-12-21T20:46:08ZengAmerican Physical SocietyPhysical Review X2160-33082018-05-018202103410.1103/PhysRevX.8.021034Importance of Electronic Correlations and Unusual Excitonic Effects in Formamidinium Lead Halide PerovskitesT. J. WhitcherJ.-X. ZhuX. ChiH. HuDaming ZhaoT. C. AsmaraX. YuM. B. H. BreeseA. H. Castro NetoY. M. LamA. T. S. WeeElbert E. M. ChiaA. RusydiHybrid 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 FA_{0.85}Cs_{0.15}PbI_{2.9}Br_{0.1} 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- and high-energy bands caused by doping.http://doi.org/10.1103/PhysRevX.8.021034 |
| spellingShingle | T. J. Whitcher J.-X. Zhu X. Chi H. Hu Daming Zhao T. C. Asmara X. Yu M. B. H. Breese A. H. Castro Neto Y. M. Lam A. T. S. Wee Elbert E. M. Chia A. Rusydi Importance of Electronic Correlations and Unusual Excitonic Effects in Formamidinium Lead Halide Perovskites Physical Review X |
| title | Importance of Electronic Correlations and Unusual Excitonic Effects in Formamidinium Lead Halide Perovskites |
| title_full | Importance of Electronic Correlations and Unusual Excitonic Effects in Formamidinium Lead Halide Perovskites |
| title_fullStr | Importance of Electronic Correlations and Unusual Excitonic Effects in Formamidinium Lead Halide Perovskites |
| title_full_unstemmed | Importance of Electronic Correlations and Unusual Excitonic Effects in Formamidinium Lead Halide Perovskites |
| title_short | Importance of Electronic Correlations and Unusual Excitonic Effects in Formamidinium Lead Halide Perovskites |
| title_sort | importance of electronic correlations and unusual excitonic effects in formamidinium lead halide perovskites |
| url | http://doi.org/10.1103/PhysRevX.8.021034 |
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