Discerning Recombination Mechanisms in Perovskite Solar Cells including 2D/3D Interfaces and Mixed Anions/Cations Absorbers
Osbel Almora a b c, Kyung Taek Cho d, Sadig Aghazada d, Iwan Zimmermann d, Gebhard J. Matt a, Christoph J. Brabec a, Nazeeruddin Mohammad Khaja d, Germà Garcia-Belmonte c
a Institute of Materials for Electronics and Energy Technology (i-MEET), Friedrich-Alexander Universität Erlangen-Nürnberg,Germany, Martensstraße, 7, Erlangen, Germany
b Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander Universität Erlangen-Nürnberg, Germany, Paul-Gordan-Straße, 6, Erlangen, Germany
c Universitat Jaume I, Institute of Advanced Materials (INAM) - Spain, Avinguda de Vicent Sos Baynat, Castelló de la Plana, Spain
d Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), CH-1951 Sion, Switzerland
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Benidorm, Spain, 2018 May 28th - 31st
Organizers: Emilio Palomares and Rene Janssen
Poster, Osbel Almora, 213
Publication date: 21st February 2018

While most efforts in the field of perovskite solar cells (PSCs) are focused in the material science development of more efficient and stable devices, recombination mechanisms and other several aspects behind the physical working principle of these devises are still unclear. Reason for that is due to the various anomalous comportment preventing standard characterizations such as the hysteresis in the current-voltage curve and related transient behaviors associated with ionic mechanisms. In this work a reliable analysis of recombination mechanism is presented based on the determination of the resistive response via impedance spectroscopy, free of hysteretic influences, on a wide set of devices using different perovskite absorbers (3D perovskites layer based on CH3NH3PbI3 or mixed Cs0.1FA0.74MA0.13PbI2.48Br0.39) and a variety of interlayers (2D perovskite thin capping). In addition, normal and inverted hysteresis are explored and modeled showing limit cases on ionic-affected recombination patterns. Our work identifies common features in the carrier recombination mechanisms among different types of high-efficiency PSCs, and simultaneously signals particularities on specific architectures, mostly in the carrier dynamics at outer interfaces.

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