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Exciton-Dominated Core-Level Absorption Spectra of Hybrid Organic-Inorganic Lead Halide Perovskites
- Publication Year :
- 2018
-
Abstract
- In a combined theoretical and experimental work, we investigate X-ray Absorption Near-Edge Structure (XANES) spectroscopy of the I $L_3$ and the Pb $M_5$ edges of the methylammonium lead iodide ($\textrm{MAPbI}_3$) hybrid inorganic-organic perovskite and its binary phase $\textrm{PbI}_2$. The absorption onsets are dominated by bound excitons with sizable binding energies of a few hundred meV and pronounced anisotropy. The spectra of both materials exhibit remarkable similarities, suggesting that the fingerprints of core excitations in $\textrm{MAPbI}_3$ are essentially given by its inorganic component, with negligible influence from the organic groups. The theoretical analysis complementing experimental observations provides the conceptual insights required for a full characterization of this complex material.
- Subjects :
- Condensed Matter - Materials Science
Materials science
Absorption spectroscopy
Exciton
Binding energy
Materials Science (cond-mat.mtrl-sci)
FOS: Physical sciences
Halide
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Spectral line
0104 chemical sciences
Chemical physics
General Materials Science
Physical and Theoretical Chemistry
0210 nano-technology
Absorption (electromagnetic radiation)
Spectroscopy
Perovskite (structure)
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....7ef1c7ebe983301c61c8e8655ca0130b