Cited by 603Perovskite Materials and ApplicationsOrganic Electronics and Photovoltaics2D Materials and Applications

Correlated electron–hole plasma in organometal perovskites

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Saba, Michele, Cadelano, Michele, Marongiu, Daniela, Chen, Feipeng, Sarritzu, Valerio, Sestu, Nicola, Figus, Cristiana, Aresti, Mauro +7 more·2014·Nature Communications

Abstract

Organic-inorganic perovskites are a class of solution-processed semiconductors holding promise for the realization of low-cost efficient solar cells and on-chip lasers. Despite the recent attention they have attracted, fundamental aspects of the photophysics underlying device operation still remain elusive. Here we use photoluminescence and transmission spectroscopy to show that photoexcitations give rise to a conducting plasma of unbound but Coulomb-correlated electron-hole pairs at all excitations of interest for light-energy conversion and stimulated optical amplification. The conductive nature of the photoexcited plasma has crucial consequences for perovskite-based devices: in solar cells, it ensures efficient charge separation and ambipolar transport while, concerning lasing, it provides a low threshold for light amplification and justifies a favourable outlook for the demonstration of an electrically driven laser. We find a significant trap density, whose cross-section for carrier capture is however low, yielding a minor impact on device performance.

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Authors
Saba, M., Cadelano, M., Marongiu, D., Chen, F., Sarritzu, V., Sestu, N., Figus, C., Aresti, M., Piras, R., Geddo Lehmann, A., Cannas, C., Musinu, A., Quochi, F., Mura, A., & Bongiovanni, G.
Affiliations
University of Cagliari (IT)
Corresponding author
Bongiovanni, Giovanni
Venue
Nature Communications
Published
2014-09-30
Volume
5
Issue
1
Pages
5049-5049
ISSN
2041-1723 (ISSN-L)
OpenAlex
W1981069060
Cited by
603
References
59
Citations by year
2026: 24 · 2025: 38 · 2024: 32 · 2023: 32 · 2022: 31 · 2021: 58 · 2020: 61 · 2019: 57 · 2018: 70 · 2017: 69 · 2016: 85 · 2015: 43 · 2014: 3
FWCI
35.43
Type
journal article
Language
en
Open access
Locations
  • Nature Communications (publishedVersion)
  • PubMed (publishedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
  • UNICA IRIS Institutional Research Information System (University of Cagliari) (submittedVersion, other-oa)
Funders
Regione Autonoma della Sardegna (CRP3-114, CRP-18353, CRP-17571, L.R. 7, CRP-18013, CRP- 24978)
Topics
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Perovskite Materials and Applications
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Organic Electronics and Photovoltaics
  • Physical Sciences › Materials Science › Materials Chemistry › 2D Materials and Applications
Keywords
organometallic perovskites, electron-hole plasma, photoexcitation, charge trapping, trap density, ambipolar transport, charge separation, perovskite solar cells, electrically driven lasers, photophysical properties

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