Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.008
Publication date: 22nd December 2022
The first part shall provide an overview of the development of roll-to-roll processed organic solar modules at Fraunhofer ISE.
The focus is on slot-die coated, laser-processed modules with ITO-free electrode systems.
Results will be presented both from opaque devices as well as semitransparent ones based on visibly transparent electrodes with high NIR reflection.
The second part is on photoluminescence measurements of organic solar cells. These are far more complicated compared to all other PV technologies as the signal is strongly dominated by the radiative decay of photogenerated excitons in the donor and/or acceptor phase [1]. The underlying luminescence signal related to the free charge carriers is therefore hidden and can not be determined quantitatively. I will present a newly developed method that enables separating the contribution of photogenerated excitons from the one related to the radiative recombination of free charge carriers. This way the quasi Fermi level separation within the absorber can be determined. An excellent agreement between the latter and the electrical voltage measured between the terminals of the solar cells is observed for devices with selective electrodes.
This newly developed method enables new optimization strategies, including the quantitative comparison of pure absorber films or half cells with complete solar cells.
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