The Genesis and Rise of Molecular Photovoltaics and Perovskite Solar Cells
Michael Graetzel a
a Swiss Federal Institute of Technology Lausanne (EPFL), Institute of Physics, Lausanne, Switzerland
International Conference on Hybrid and Organic Photovoltaics
Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Online, Spain, 2021 May 24th - 28th
Organizers: Marina Freitag, Feng Gao and Sam Stranks
Keynote, Michael Graetzel, presentation 104
Publication date: 11th May 2021

Over the last years molecular photovoltaics, such as dye sensitized cells (DSCs) and perovskite solar cells (PSCs) have emerged as credible contenders to conventional p-n junction photovoltaics. The certified power conversion efficiency of PSCs currently attains 25.5 %, exceeding that of the market leader polycrystalline silicon. This lecture covers the genesis and recent evolution of DSCs and PSCs, describing their operational principles, current performance. DSCs have now found commercial applications for ambient light harvesting and electric power producing glazing. The scale up and pilote production of PSCs are progressing rapidly but there remain challenges that still need to be met to implement PSCs on a large commercial scale. PSCs can produce high photovoltages rendering them attractive for applications in tandem cells, e.g. with silicon and for the generation of fuels from sunlight. Examples are the solar generation of hydrogen from water and the conversion of CO2 to chemical feedstocks such as ethylene, mimicking natural photosynthesis.

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