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The Role of Bulk and Interface Recombination in High-Efficiency Low-Dimensional Perovskite Solar Cells

  • 2D Ruddlesden-Popper perovskite (RPP) solar cells have excellent environmental stability. However, the power conversion efficiency (PCE) of RPP cells remains inferior to 3D perovskite-based cells. Herein, 2D (CH3(CH2)(3)NH3)(2)(CH3NH3)(n-1)PbnI3n+1 perovskite cells with different numbers of [PbI6](4-) sheets (n = 2-4) are analyzed. Photoluminescence quantum yield (PLQY) measurements show that nonradiative open-circuit voltage (V-OC) losses outweigh radiative losses in materials with n > 2. The n = 3 and n = 4 films exhibit a higher PLQY than the standard 3D methylammonium lead iodide perovskite although this is accompanied by increased interfacial recombination at the top perovskite/C-60 interface. This tradeoff results in a similar PLQY in all devices, including the n = 2 system where the perovskite bulk dominates the recombination properties of the cell. In most cases the quasi-Fermi level splitting matches the device V-OC within 20 meV, which indicates minimal recombination losses at the metal contacts. The results show that poor2D Ruddlesden-Popper perovskite (RPP) solar cells have excellent environmental stability. However, the power conversion efficiency (PCE) of RPP cells remains inferior to 3D perovskite-based cells. Herein, 2D (CH3(CH2)(3)NH3)(2)(CH3NH3)(n-1)PbnI3n+1 perovskite cells with different numbers of [PbI6](4-) sheets (n = 2-4) are analyzed. Photoluminescence quantum yield (PLQY) measurements show that nonradiative open-circuit voltage (V-OC) losses outweigh radiative losses in materials with n > 2. The n = 3 and n = 4 films exhibit a higher PLQY than the standard 3D methylammonium lead iodide perovskite although this is accompanied by increased interfacial recombination at the top perovskite/C-60 interface. This tradeoff results in a similar PLQY in all devices, including the n = 2 system where the perovskite bulk dominates the recombination properties of the cell. In most cases the quasi-Fermi level splitting matches the device V-OC within 20 meV, which indicates minimal recombination losses at the metal contacts. The results show that poor charge transport rather than exciton dissociation is the primary reason for the reduction in fill factor of the RPP devices. Optimized n = 4 RPP solar cells had PCEs of 13% with significant potential for further improvements.zeige mehrzeige weniger

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Metadaten
Verfasserangaben:Shanshan Zhang, Seyed Mehrdad HosseiniORCiDGND, Rene Gunder, Andrei Petsiuk, Pietro CaprioglioORCiDGND, Christian Michael WolffORCiDGND, Safa Shoaee, Paul MeredithORCiD, Susan SchorrORCiDGND, Thomas UnoldORCiD, Paul L. Burn, Dieter NeherORCiDGND, Martin StolterfohtORCiD
DOI:https://doi.org/10.1002/adma.201901090
ISSN:0935-9648
ISSN:1521-4095
Pubmed ID:https://pubmed.ncbi.nlm.nih.gov/31166640
Titel des übergeordneten Werks (Englisch):Advanced materials
Verlag:Wiley-VCH
Verlagsort:Weinheim
Publikationstyp:Wissenschaftlicher Artikel
Sprache:Englisch
Datum der Erstveröffentlichung:05.06.2019
Erscheinungsjahr:2019
Datum der Freischaltung:11.01.2021
Freies Schlagwort / Tag:2D perovskites; V-OC loss; interface recombination; perovskite solar cells; photoluminescence
Band:31
Ausgabe:30
Seitenanzahl:11
Fördernde Institution:Chinese Scholarship Council studentship; Australian Government through the Australian Renewable Energy Agency (ARENA) Australian Centre for Advanced PhotovoltaicsAustralian Renewable Energy Agency (ARENA); Alexander von Humboldt FoundationAlexander von Humboldt Foundation; HyPerCells, a joint graduate school of the University of Potsdam; Helmholtz Center Berlin; Alexander von Humboldt Foundation - Ser Cymru II Program in Sustainable Advanced Materials (European Regional Development Fund); Swansea University Strategic Initiative [FL160100067]; Fraunhofer-Institut fur Angewandte Polymerforschung (IAP); Welsh European Funding Office; Swansea University Strategic Initiative); Australian Research Council Laureate FellowAustralian Research Council
Organisationseinheiten:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie
DDC-Klassifikation:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Peer Review:Referiert
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