Photoelectrochemical Energy Storage with Organic Solar Cells

Rodrigo Delgado Andrés^a^,^c^,^e, Taisiia Berestok^a^,^b, Robin Wessling^a^,^d, Kateryna Shchyrba^a^,^c^,^e, Anna Fischer^a^,^b, Birgit Esser^a^,^d, Uli Würfel^a^,^c^,^e

^aCluster of Excellence livMatS @ FIT – Freiburg Center for Interactive Materials and Bioinspired Technologies, University of Freiburg, Germany

^bInstitute of Inorganic and Analytical Chemistry, University of Freiburg, Germany

^cFreiburg Materials Research Center FMF, Albert-Ludwigs-University Freiburg, DE, Stefan-Meier-Straße, 25, Freiburg im Breisgau, Germany

^dInstitute for Organic Chemistry II, University of Ulm

^eFraunhofer Institute for Solar Energy Systems (ISE), Freiburg, Germany

Materials for Sustainable Development Conference (MATSUS)
Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)

#NewOPV - New concepts for stable non-fullerene based organic solar cells and their applications

VALÈNCIA, Spain, 2023 March 6th - 10th

Organizers: Vida Engmann, Morten Madsen and Pavel Troshin

Oral, Rodrigo Delgado Andrés, presentation 017
DOI: https://doi.org/10.29363/nanoge.matsus.2023.017
Publication date: 22nd December 2022

The global trend towards automatization and miniaturization of smart devices has triggered the development of reliable off-grid power sources with low economic and environmental impact. Such autonomy can be provided when a photovoltaic cell is integrated with an electrochemical storage device in one monolithic device. This work demonstrates a reliable and straightforward approach to monolithically integrate high-performance single and multijunction organic solar cells with mesoporous nitrogen doped carbon nanosphere-based supercapacitors or lithium-organic batteries in a single device with a three-electrode configuration. To assess the efficiency of these devices, a novel approach is presented that relies on the direct monitoring of both integrating parts during illuminated and dark phases and accounts for possible losses. This versatile approach is applicable for all kinds of integrated multifunctional photoconversion-storage systems. For the photosupercapacitors, the evaluation with the standard literature approach showed an outstanding performance with a peak photoelectrochemical energy conversion efficiency of 17 %. However, in our opinion this type of efficiency does not properly represent the real overall device efficiency. Based on our newly developed efficiency determination, a more modest overall cycle efficiency of 2 % is obtained. For battery-based devices, a higher output voltage is achieved, but at the cost of a lower, 0.3% cycle efficiency. In our view these values represent the real overall performance of the integrated device in a precise manner and will thus enable meaningful direct comparisons among different photoelectrochemical storage systems.

Acknowledgements:

This work was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy – EXC-2193/1 – 390951807.

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