Interfacial and doping engineering for stable perovskite solar cells
Haibing Xie a, Zaiwei Wang b, Kubicki Dominik Józef c, Agarwalla Anand b, Hui-Seon Kim b, Prochowicz Daniel c, Alba Mingorance a, Neus Domingo a, Shaik Mohammed Zakeeruddin c, Michael Grätzel c, Anders Hagfeldt b, Monica Lira-Cantu a
a Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, Barcelona, Spain
b Ecole Polytechnique Fédérale de Lausanne EPFL, Laboratory of Photomolecular Science, Institute of Chemical Sciences and Engineering, Station, 6, Lausanne, Switzerland
c Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Switzerland, Station 6, CH-1015 Lausanne, Lausanne, 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, Haibing Xie, 301
Publication date: 21st February 2018

In the past few years, emerging photovoltaic (PV) technologies have observed an exponential increase in power conversion efficiencies (PCE) with halide perovskite solar cells (PSCs) reaching the 23 % efficiency mark. Nevertheless, long-term operation stability is the main bottleneck for perovskites to compare with mature photovoltaic technologies like Si, CuInGaSe2 and CdTe solar cells. In this work, we present our most recent results related to the application of a series of molecules applied as organic modifiers specifically selected with two different anchoring groups and variable chain length. The organic molecules are applied within the perovskite layer, modifying the perovskite layer itself and also the oxide/perovskite interface. Champion solar cells applying the organic modifiers showed more than 19 % efficiency. Stability analyses demonstrated no degradation for 1000 h under full sun illumination in comparison with a 30% power loss observed for the reference devices without organic modifiers. The morphology, structure, composition and optoelectronic properties of PSCs as function of modifier concentration/chain length are systematically studied. The bonding of modifier molecules with the halide perovskite and oxides are illustrated by using Fourier-transform Infrared Spectroscopy (FTIR) and Nuclear Magnetic Resonance (NMR). A novel model is proposed to explain the mechanism of modifier molecules for enhanced stability. 

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