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Crystals 2017, 7(8), 252;

Interfacial Kinetics of Efficient Perovskite Solar Cells

Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, School of Basic Sciences, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
Instituto de Ciencia Molecular, Universidad de Valencia, C/Catedrático J. Beltrán 2, 46980 Paterna, Spain
Author to whom correspondence should be addressed.
Academic Editor: Stevin Snellius Pramana
Received: 9 June 2017 / Revised: 30 July 2017 / Accepted: 3 August 2017 / Published: 13 August 2017
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Perovskite solar cells (PSCs) have immense potential for high power conversion efficiency with an ease of fabrication procedure. The fundamental understanding of interfacial kinetics in PSCs is crucial for further improving of their photovoltaic performance. Herein we use the current-voltage (J-V) characteristics and impedance spectroscopy (IS) measurements to probe the interfacial kinetics on efficient MAPbI3 solar cells. We show that series resistance (RS) of PSCs exhibits an ohmic and non-ohmic behavior that causes a significant voltage drop across it. The Nyquist spectra as a function of applied bias reveal the characteristic features of ion motion and accumulation that is mainly associated with the MA cations in MAPbI3. With these findings, we provide an efficient way to understand the working mechanism of perovskite solar cells. View Full-Text
Keywords: perovskite; MAPbI3; impedance; interfaces perovskite; MAPbI3; impedance; interfaces

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Yadav, P.; Prochowicz, D.; Saliba, M.; Boix, P.P.; Zakeeruddin, S.M.; Grätzel, M. Interfacial Kinetics of Efficient Perovskite Solar Cells. Crystals 2017, 7, 252.

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