The Electronic Disorder Landscape of Mixed Halide Perovskites.
Journal
ACS energy letters
ISSN: 2380-8195
Titre abrégé: ACS Energy Lett
Pays: United States
ID NLM: 101697523
Informations de publication
Date de publication:
13 Jan 2023
13 Jan 2023
Historique:
received:
17
10
2022
accepted:
23
11
2022
entrez:
20
1
2023
pubmed:
21
1
2023
medline:
21
1
2023
Statut:
epublish
Résumé
Band gap tunability of lead mixed halide perovskites makes them promising candidates for various applications in optoelectronics. Here we use the localization landscape theory to reveal that the static disorder due to iodide:bromide compositional alloying contributes at most 3 meV to the Urbach energy. Our modeling reveals that the reason for this small contribution is due to the small effective masses in perovskites, resulting in a natural length scale of around 20 nm for the "effective confining potential" for electrons and holes, with short-range potential fluctuations smoothed out. The increase in Urbach energy across the compositional range agrees well with our optical absorption measurements. We model systems of sizes up to 80 nm in three dimensions, allowing us to accurately reproduce the experimentally observed absorption spectra of perovskites with halide segregation. Our results suggest that we should look beyond static contribution and focus on the dynamic temperature dependent contribution to the Urbach energy.
Identifiants
pubmed: 36660372
doi: 10.1021/acsenergylett.2c02352
pmc: PMC9841609
doi:
Types de publication
Journal Article
Langues
eng
Pagination
250-258Informations de copyright
© 2022 The Authors. Published by American Chemical Society.
Déclaration de conflit d'intérêts
The authors declare no competing financial interest.
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