title: Determination of Interfacial Charge-Transfer Rate Constants in Perovskite Solar Cells.
abstract: A simple protocol to study the dynamics of charge transfer to selective contacts in perovskite solar cells, based on time-resolved laser spectroscopy studies, in which the effect of bimolecular electron-hole recombination has been eliminated, is proposed. Through the proposed procedure, the interfacial charge-transfer rate constants from methylammonium lead iodide perovskite to different contact materials can be determined. Hole transfer is faster for CuSCN (rate constant 0.20 ns(-1) ) than that for 2,2',7,7'-tetrakis-(N,N-di-4-methoxyphenylamino)-9,9'-spirobifluorene (spiro-OMeTAD; 0.06 ns(-1) ), and electron transfer is faster for mesoporous (0.11 ns(-1) ) than that for compact (0.02 ns(-1) ) TiO2 layers. Despite more rapid charge separation, the photovoltaic performance of CuSCN cells is worse than that of spiro-OMeTAD cells; this is explained by faster charge recombination in CuSCN cells, as revealed by impedance spectroscopy. The proposed direction of studies should be one of the key strategies to explore efficient hole-selective contacts as an alternative to spiro-OMeTAD.
authors.affiliation: Quantum Electronics Laboratory, Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614, Poznań, Poland.
authors.forename: Katarzyna
authors.initials: K
authors.lastname: Pydzińska
authors.affiliation: Quantum Electronics Laboratory, Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614, Poznań, Poland.|Center for Ultrafast Laser Spectroscopy, Adam Mickiewicz University, Umultowska 85, 61-614, Poznań, Poland.
authors.forename: Jerzy
authors.initials: J
authors.lastname: Karolczak
authors.affiliation: Materials Division, IK4-CIDETEC, Parque Tecnológico de San Sebastián, Paseo Miramón, 196, Donostia-San Sebastián, 20009, Spain.
authors.forename: Ivet
authors.initials: I
authors.lastname: Kosta
authors.affiliation: Materials Division, IK4-CIDETEC, Parque Tecnológico de San Sebastián, Paseo Miramón, 196, Donostia-San Sebastián, 20009, Spain.
authors.forename: Ramon
authors.initials: R
authors.lastname: Tena-Zaera
authors.affiliation: Nanostructured Solar Cells Group, Department of Physical, Chemical and Natural Systems, Universidad Pablo de Olavide, Ctra. Utrera, km 1, ES-41013, Seville, Spain.
authors.forename: Anna
authors.initials: A
authors.lastname: Todinova
authors.affiliation: Nanostructured Solar Cells Group, Department of Physical, Chemical and Natural Systems, Universidad Pablo de Olavide, Ctra. Utrera, km 1, ES-41013, Seville, Spain.
authors.forename: Jesus
authors.initials: J
authors.lastname: Idígoras
authors.affiliation: Nanostructured Solar Cells Group, Department of Physical, Chemical and Natural Systems, Universidad Pablo de Olavide, Ctra. Utrera, km 1, ES-41013, Seville, Spain.
authors.forename: Juan A
authors.initials: JA
authors.lastname: Anta
authors.affiliation: Quantum Electronics Laboratory, Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614, Poznań, Poland. marziol@amu.edu.pl.
authors.forename: Marcin
authors.identifier: 0000-0003-1882-6022
authors.initials: M
authors.lastname: Ziółek
mesh_terms: D065966:Absorption, Physicochemical; D017610:Calcium Compounds / Q000737:chemistry*; D011211:Electric Power Supplies; D004579:Electron Transport; D007700:Kinetics; D008027:Light; D010087:Oxides / Q000737:chemistry*; D012993:Solar Energy; D013050:Spectrometry, Fluorescence; D013141:Spiro Compounds / Q000737:chemistry; D014025:Titanium / Q000737:chemistry*
chemical_list: D017610:Calcium Compounds; D010087:Oxides; D013141:Spiro Compounds; C059910:perovskite; D014025:Titanium
keywords: charge transfer; electrochemistry; perovskites; solar cells; time-resolved spectroscopy