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Title: Low-frequency carrier kinetics in triple cation perovskite solar cells probed by impedance and modulus spectroscopy
Authors: Tailor N.K.
Senanayak S.P.
Abdi-Jalebi M.
Satapathi, Soumitra
Published in: Electrochimica Acta
Abstract: Organometallic halide perovskites-based solar cells have emerged as next-generation photovoltaic technology. However, many of its intriguing optoelectronic properties at low frequency are highly debated. Here, we investigate the low-frequency carrier kinetics of the state-of-the-art triple cation perovskite Cs0.06FA0.79MA0.15Pb(I0.85Br0.15)3 solar cells using bias-dependent impedance and modulus spectroscopy under dark and illumination conditions. We observe a strong dependence of dielectric permittivity on frequency in 1 Hz to 1 MHz region with a dielectric relaxation, which is observed to follow the Maxwell-Wagner type interfacial polarization possibly originating from the grain boundary/ionic defects. Furthermore, correlating the impedance and modulus spectra reveals the localized charge carrier relaxation in this triple cation device from which we obtain a phenomenological picture of the hopping process and developing an understanding of the charge carrier kinetics in these high-efficiency perovskite photovoltaics. © 2021
Citation: Electrochimica Acta, 386
Issue Date: 2021
Publisher: Elsevier Ltd
Keywords: Carrier kinetics
Modulus spectroscopy
Triple cation perovskite solar cells
ISSN: 134686
Author Scopus IDs: 57211634045
Author Affiliations: Tailor, N.K., Department of Physics, Indian Institute of Technology RoorkeeUttarakhand 247667, India
Senanayak, S.P., School of Physical Sciences, National Institute of Science Education and Research, HBNI, Jatni, 752050, India
Abdi-Jalebi, M., Institute for Materials Discovery, University College London, Malet Place, London WC1E 7JE, United Kingdom
Satapathi, S., Department of Physics, Indian Institute of Technology RoorkeeUttarakhand 247667, India
Funding Details: NKT like to acknowledge UGC Research Fellowship. MA-J thanks Cambridge Materials Limited, the Royal Society (RGS\R1\211068), Wolfson College, University of Cambridge and EPSRC for their funding and technical support. SPS thanks Royal Society Alumni Fellowship, SERB Project (SRG/2020/001641) and DAE Government of India for funding support. SS like to acknowledge Ministry of Electronics and Information technology DIC-1377-PHY. Engineering and Physical Sciences Research Council, EPSRC; Royal Society: RGS\R1\211068; University Grants Committee, UGC; Science and Engineering Research Board, SERB: SRG/2020/001641
Corresponding Author: Abdi-Jalebi, M.; Institute for Materials Discovery, London WC1E 7JE, United Kingdom; email:
Appears in Collections:Journal Publications [PH]

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