Enhanced charge carrier mobility and lifetime suppress hysteresis and improve efficiency in planar perovskite solar cells
Silver-Hamill Turren-Cruz a b, Michael Saliba a, Matthew T. Mayer a, Hector Juárez-Santiesteban b, Xavier Mathew c, Lea Nienhaus d, Wolfgang Tress a, Moungi G. Bawendi d, Michael Grätzel a, Antonio Abate e, Anders Hagfeldt a, Juan-Pablo Correa-Baena a d
a Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland
b Benemérita Universidad Autónoma de Puebla. CIDS, Av. San Claudio y 18 Sur, Col. San Manuel, Ciudad Universitaria, CP 72570, P.O. Box 1067, Puebla, Pue., 7200, México
c Instituto de Energías Renovables, Universidad Nacional Autónoma de México, Priv. Xochicalco S/N, Temixco, 62330, Mexico
d Massachusetts Institute of Technology (MIT), Massachusetts Avenue, 77, Cambridge, United States
e Helmholtz-Zentrum Berlin für Materialien und Energie, Young Investigator Group Active Materials and interfaces for stable perovskite solar cells, Kekulestraße, 5, Berlin, Germany
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, Silver-Hamill Turren-Cruz, 314
Publication date: 21st February 2018

Perovskite solar cells (PSCs) are very promising lab-scale technologies to deliver inexpensive solar electricity. Low-temperature, planar PSCs are of particularly interest for large-scale deployment due to their inherent suitability for flexible substrates and potential for silicon/perovskite tandems. So far, planar PSCs have been prone to large current-voltage hysteresis and low stabilized power output due to a number of issues associated with this kind of device configuration. We find that the suppression of the yellow-phase impurity (∂-FAPbI3) present in formamidium-based perovskites, by RbI incorporation, contributes to low hysteresis, long living carrier lifetimes and a champion stabilized power output of 20.3% using SnOX as the electron selective contact. We study in depth, the effects of these impurities on the transient behavior that defines hysteresis and its relation to ionic movement. In addition, we find that the formation of a RbPbI3 phase does not significantly affect the charge carrier lifetimes and consequently the performance of the devices. This brings new physical insights onto the role of different impurities in perovskite solar cells, which make these materials so remarkable.

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