Photochromism in Bulk Heterojunction Organic Solar Cells
Bart Saes a, Michael Pätzel b, Martin Herder c, Martijn Wienk a, Rene Janssen a, Stefan Hecht b
a Molecular Materials and Nanosystems, Eindhoven University of Technology, Netherlands, Netherlands
b Humboldt-Universität, Newtonstr. 15, Berlin, Germany
c University of Strasbourg, France., Strasbourg, France
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, Bart Saes, 097
Publication date: 21st February 2018

The development of fully transparent systems capable of energy harvesting to replace glass facades has been an important topic in science for the past decade. The creation of a sustainable system capable of efficiently harvesting solar energy would enable for the use of glass building facades as surfaces fit for energy harvesting. Not only would the energy harvesting in window glass aid to meet the global energy demand, it would also open up options for off-grid applications for systems that require little energy to function, thus omitting the need for wiring and other related system expenses.

Coupled to this development is already commercialized development of photochromic windows (or 'smart windows'). Smart windows can turn from a colourless window to a coloured window under illumination and are able to thermally revert back to their colourless state with the goal to save on building climate control costs and to improve the quality of life.

The combination of those two technologies would ideally yield a system that turns coloured under illumination and thermally reverts back to an uncoloured state, being able to harvest energy at the same time. The presented poster describes such a system in its proof-of-principle state of research by making use of a bulk-heterojunction structured colourless solar cell that incorporates a photochromic organic dye. The dye is blended in within the bulk-heterojunction active layer of the device and aids in the harvesting of solar energy.

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