Dresden 2017 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 25: Fundamentals of Perovskite Photovoltaics IV (joint session CPP/DS/HL)

CPP 25.1: Invited Talk

Tuesday, March 21, 2017, 14:00–14:30, ZEU 222

Interface engineering: the route towards high efficiency and stable hybrid perovskite solar cells — •Giulia Grancini — Group for Molecular Engineering of Functional Materials, EPFL Valais Wallis, CH-1951 Sion, Switzerland

Hybrid perovskite solar cells are undoubtedly leading the photovoltaic scene with their power conversion efficiency (PCE) >22%. Tuning the material composition, i.e. by cations and anions substitution (e.g. introducing a small amount of Br) and the interfacial properties, optimizing the structural and chemical interactions and the optoelectronic processes therein have been the successful routes for a real breakthrough in device efficiency and reproducibility. However, despite the impressive PCE reported, hybrid perovskite suffer of severe instability mainly due to material degradation upon exposure to water and moisture further accelerated under local heating and UV irradiation. Diverse technological approaches have been proposed delivering appreciable improvements, but still failing by far the market requirements. Recently, we pioneered a new concept by interface engineering a multi-dimensional composite of two dimensional (2D) (HOOC(CH2)2NH3)2PbI4 / 3D-CH3NH3PbI3 perovskite molecular junction. The composite forms an exceptional gradually organized structure that yields up to 12.9% PCE. Aiming at the up-scaling of this technology, we realize 10x10 cm2 large-area solar modules by a fully printable, industrial-scale process delivering 11.2% stable devices for 9,000 hours under accelerated testing conditions, leading to a record one-year stability.