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Static Disorder in Lead Halide Perovskites

Stefan Zeiske, Oskar Sandberg Orcid Logo, Nasim Zarrabi, Christian M. Wolff Orcid Logo, Meysam Raoufi, Francisco Peña-Camargo Orcid Logo, Emilio Gutierrez-Partida, Paul Meredith Orcid Logo, Martin Stolterfoht Orcid Logo, Ardalan Armin Orcid Logo

The Journal of Physical Chemistry Letters, Volume: 13, Issue: 31, Pages: 7280 - 7285

Swansea University Authors: Stefan Zeiske, Oskar Sandberg Orcid Logo, Nasim Zarrabi, Paul Meredith Orcid Logo, Ardalan Armin Orcid Logo

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Abstract

In crystalline and amorphous semiconductors, the temperature-dependent Urbach energy can be determined from the inverse slope of the logarithm of the absorption spectrum and reflects the static and dynamic energetic disorder. Using recent advances in the sensitivity of photocurrent spectroscopy meth...

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Published in: The Journal of Physical Chemistry Letters
ISSN: 1948-7185 1948-7185
Published: American Chemical Society (ACS) 2022
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa60632
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Abstract: In crystalline and amorphous semiconductors, the temperature-dependent Urbach energy can be determined from the inverse slope of the logarithm of the absorption spectrum and reflects the static and dynamic energetic disorder. Using recent advances in the sensitivity of photocurrent spectroscopy methods, we elucidate the temperature-dependent Urbach energy in lead halide perovskites containing different numbers of cation components. We find Urbach energies at room temperature to be 13.0 ± 1.0, 13.2 ± 1.0, and 13.5 ± 1.0 meV for single, double, and triple cation perovskite. Static, temperature-independent contributions to the Urbach energy are found to be as low as 5.1 ± 0.5, 4.7 ± 0.3, and 3.3 ± 0.9 meV for the same systems. Our results suggest that, at a low temperature, the dominant static disorder in perovskites is derived from zero-point phonon energy rather than structural disorder. This is unusual for solution-processed semiconductors but broadens the potential application of perovskites further to quantum electronics and devices.
College: Faculty of Science and Engineering
Funders: Llywodraeth Cymru Deutsche Forschungsgemeinschaft - 498155101, 423749265, 424709669 - SPP 2196; UK Research and Innovation - EP/T028511/1
Issue: 31
Start Page: 7280
End Page: 7285