Exciton-Dominated Core-Level Absorption Spectra of Hybrid Organic-Inorganic Lead Halide Perovskites

Severin Habisreutinger, Christian Vorwerk, Claudia Hartmann, Caterina Cocchi, Golnaz Sadoughi, Roberto Felix, Regan Wilks, Henry Snaith, Marcus Bar, Claudia Draxl

Research output: Contribution to journalArticlepeer-review

20 Scopus Citations

Abstract

In a combined theoretical and experimental work, we investigate X-ray absorption near-edge structure spectroscopy of the I L3 and the Pb M5 edges of the methylammonium lead iodide (MAPbI3) hybrid inorganic-organic perovskite and its binary phase PbI2. The absorption onsets are dominated by bound excitons with sizable binding energies of a few hundred millielectronvolts and pronounced anisotropy. The spectra of both materials exhibit remarkable similarities, suggesting that the fingerprints of core excitations in MAPbI3 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.
Original languageAmerican English
Pages (from-to)1852-1858
Number of pages7
JournalJournal of Physical Chemistry Letters
Volume9
Issue number8
DOIs
StatePublished - 2018

NREL Publication Number

  • NREL/JA-5900-71280

Keywords

  • inorganic-organic perovskites
  • x-ray absorption

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