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Lookup NU author(s): Professor Marina FreitagORCiD
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© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, WeinheimIn perovskite solar cells (PSCs), the most commonly used hole transport material (HTM) is spiro-OMeTAD, which is typically doped by metalorganic complexes, for example, based on Co, to improve charge transport properties and thereby enhance the photovoltaic performance of the device. In this study, we report a new hemicage-structured iron complex, 1,3,5-tris(5′-methyl-2,2′-bipyridin-5-yl)ethylbenzene Fe(III)-tris(bis(trifluoromethylsulfonyl)imide), as a p-type dopant for spiro-OMeTAD. The formal redox potential of this compound was measured as 1.29 V vs. the standard hydrogen electrode, which is slightly (20 mV) more positive than that of the commercial cobalt dopant FK209. Photoelectron spectroscopy measurements confirm that the iron complex acts as an efficient p-dopant, as evidenced in an increase of the spiro-OMeTAD work function. When fabricating planar PSCs with the HTM spiro-OMeTAD doped by 5 mol % of the iron complex, a power conversion efficiency of 19.5 % (AM 1.5G, 100 mW cm−2) is achieved, compared to 19.3 % for reference devices with FK209. Open circuit voltages exceeding 1.2 V at 1 sun and reaching 1.27 V at 3 suns indicate that recombination at the perovskite/HTM interface is low when employing this iron complex. This work contributes to recent endeavors to reduce recombination losses in perovskite solar cells.
Author(s): Saygili Y, Turren-Cruz S-H, Olthof S, Saes BWH, Pehlivan IB, Saliba M, Meerholz K, Edvinsson T, Zakeeruddin SM, Gratzel M, Correa-Baena J-P, Hagfeldt A, Freitag M, Tress W
Publication type: Article
Publication status: Published
Journal: ChemPhysChem
Year: 2018
Volume: 19
Issue: 11
Pages: 1363-1370
Online publication date: 26/04/2018
Acceptance date: 02/04/2016
ISSN (print): 1439-4235
ISSN (electronic): 1439-7641
Publisher: Wiley-VCH Verlag
URL: https://doi.org/10.1002/cphc.201800032
DOI: 10.1002/cphc.201800032
PubMed id: 29697180
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