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Verfasst von:Viji, Priya [VerfasserIn]   i
 Tormann, Constantin [VerfasserIn]   i
 Göhler, Clemens [VerfasserIn]   i
 Kemerink, Martijn [VerfasserIn]   i
Titel:Hot carrier organic solar cells
Verf.angabe:Priya Viji, Constantin Tormann, Clemens Göhler and Martijn Kemerink
E-Jahr:2024
Jahr:04 Oct 2024
Umfang:8 S.
Illustrationen:Illustrationen
Fussnoten:Gesehen am 25.03.2025
Titel Quelle:Enthalten in: Energy & environmental science
Ort Quelle:Cambridge : RSC Publ., 2008
Jahr Quelle:2024
Band/Heft Quelle:17(2024), 22, Seite 8683-8690
ISSN Quelle:1754-5706
Abstract:Hot-carrier solar cells use the photon excess energy, that is, the energy exceeding the absorber bandgap, to do additional work. These devices have the potential to beat the upper limit for the photovoltaic power conversion efficiency set by near-equilibrium thermodynamics. However, since their conceptual inception in 1982, no experimental realization that works under normal operational conditions has been demonstrated, mostly due to the fast thermalization of photo-generated charges in typical semiconductor materials. Here, we use noise spectroscopy in combination with numerical modelling to show that common bulk heterojunction organic solar cells actually work as hot-carrier devices. Due to static energetic disorder, thermalization of photo-generated electrons and holes in the global density of states is slow compared to the charge carrier lifetime, leading to thermal populations of localized charge carriers that have an electronic temperature exceeding the lattice temperature. Since charge extraction takes place in a high-lying, narrow energy window around the transport energy, the latter takes the role of an energy filter. For common disorder values, this leads to enhancements in open circuit voltage of up to ∼0.2 V. We show that this enhancement can be understood as a thermovoltage that is proportional to the temperature difference between the lattice and the charge populations and that comes on top of the near-equilibrium quasi-Fermi level splitting.
DOI:doi:10.1039/D4EE02612H
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

kostenfrei: Volltext: https://doi.org/10.1039/D4EE02612H
 kostenfrei: Volltext: https://pubs.rsc.org/en/content/articlelanding/2024/ee/d4ee02612h
 DOI: https://doi.org/10.1039/D4EE02612H
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1920504192
Verknüpfungen:→ Zeitschrift

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