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Yuan, Y.* ; Yan, G.* ; Dreessen, C.* ; Rudolph, T.* ; Hülsbeck, M.* ; Klingebiel, B.* ; Ye, J.* ; Rau, U.* ; Kirchartz, T.*

Shallow defects and variable photoluminescence decay times up to 280 µs in triple-cation perovskites.

Nat. Mater. 23, 391-397 (2024)
Verlagsversion DOI
Open Access Hybrid
Quantifying recombination in halide perovskites is a crucial prerequisite to control and improve the performance of perovskite-based solar cells. While both steady-state and transient photoluminescence are frequently used to assess recombination in perovskite absorbers, quantitative analyses within a consistent model are seldom reported. We use transient photoluminescence measurements with a large dynamic range of more than ten orders of magnitude on triple-cation perovskite films showing long-lived photoluminescence transients featuring continuously changing decay times that range from tens of nanoseconds to hundreds of microseconds. We quantitatively explain both the transient and steady-state photoluminescence with the presence of a high density of shallow defects and consequent high rates of charge carrier trapping, thereby showing that deep defects do not affect the recombination dynamics. The complex carrier kinetics caused by emission and recombination processes via shallow defects imply that the reporting of only single lifetime values, as is routinely done in the literature, is meaningless for such materials. We show that the features indicative for shallow defects seen in the bare films remain dominant in finished devices and are therefore also crucial to understanding the performance of perovskite solar cells.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Schlagwörter Open-circuit Voltage; Radiative Recombination; Solar-cells; Semiconductors; Films; Limit
ISSN (print) / ISBN 1476-1122
e-ISSN 1476-1122
Zeitschrift Nature materials
Quellenangaben Band: 23, Heft: 3, Seiten: 391-397 Artikelnummer: , Supplement: ,
Verlag Nature Publishing Group
Verlagsort Basingstoke
Begutachtungsstatus Peer reviewed
Institut(e) Helmholtz AI - FZJ (HAI - FZJ)
Förderungen China and Germany Postdoctoral Exchange Program
Deutsche Forschungsgemeinschaft (German Research Foundation) via the project 'Correlating Defect Densities with Recombination Losses in Halide-Perovskite Solar Cells'
Helmholtz Association via Helmholtz.AI project AISPA, AI-driven instantaneous solar cell property analysis
Helmholtz Association via project 'Beschleunigter Transfer der nachsten Generation von Solarzellen in die Massenfertigung - Zukunftstechnologie Tandem-Solarzellen'
Helmholtz Association via innovation platform 'SolarTAP - A Solar Technology Acceleration Platform'
Helmholtz Association via POF IV funding