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Static Disorder in Lead Halide Perovskites
,
Nasim Zarrabi,
Christian M. Wolff ,
Meysam Raoufi,
Francisco Peña-Camargo ,
Emilio Gutierrez-Partida,
Paul Meredith ,
Martin Stolterfoht ,
Ardalan Armin
The Journal of Physical Chemistry Letters, Volume: 13, Issue: 31, Pages: 7280 - 7285
Swansea University Authors:
Stefan Zeiske, Oskar Sandberg , Nasim Zarrabi, Paul Meredith , Ardalan Armin
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DOI (Published version): 10.1021/acs.jpclett.2c01652
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...
| Published in: | The Journal of Physical Chemistry Letters |
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| ISSN: | 1948-7185 1948-7185 |
| Published: |
American Chemical Society (ACS)
2022
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| Online Access: |
Check full text
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa60632 |
| 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. |
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| 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 |