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Energy Seminar: Michael Grätzel, Molecular Photovoltaics and Perovskite Solar Cells

Michael Grätzel, Professor, École Polytechnique Fédérale de Lausanne, Director, Laboratory of Photonics and Interfaces
Talk abstract:
The lecture will address recent developments in molecular photovoltaics and metal-halide perovskite solar cells (PSCs). The recent introduction of Cu (I/II) complexes both as redox shuttles in liquid electrolytes and solid hole conductors has propelled the open circuit voltage of molecularly sensitized photosystems to over 1V increasing dramatically their power conversion efficiency (PCE) compared to conventional embodiments. In diffuse daylight their PCE now exceeds the performance of Gallium Arsenide (GaAs) cells opening up new commercial applications. In the rapidly rising PSC area, Professor Grätzel's research focuses on the mixed A-cation light harvesting materials, which have yielded the best performance so far in terms of stability and solar to electric power conversion efficiency (PCE), which currently reach > 22%. He will discuss latest results on carrier recombination and extraction dynamics derived from time resolved photoluminescence experiments. The PSCs exhibit high external quantum yields for electroluminescence (ca 4%) enabling open-circuit voltages larger of 1.24V to be reached, which are exceptional for a material with a bandgap of 1.6 eV. The talk will identify the efficiency limiting processes and propose measures to overcome these.



Monday, February 13, 2017. 04:30 PM


NVIDIA Auditorium, Jen-Hsun Huang Engineering Center


Precourt Institute for Energy


Free and open to all.