Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.236
Publication date: 7th February 2022
In the first part of the talk I will present current upscaling activities at Fraunhofer ISE, i.e., from small cells processed by means of spin-coating from chlorinated solvents over larger area cells processed from non-chlorinated solvents to large area roll-to-roll processed modules. Furthermore, this includes also the transition from an Indium Tin Oxide (ITO) based rigid architecture to an ITO-free flexible cell stack.
In the second part I will present results of electro- and photoluminescence studies of high-efficiency donor:acceptor blends as well as of complete solar cells. Using both steady-state and transient techniques, we try to elucidate the principal working mechanisms of organic solar cells. A strong focus is on the relation between charge carrier density, the (internal) quasi Fermi level separation and the (outer) voltage measurable between the terminals. Our aim is to contribute to the answer of the question whether organic solar cells differ from their crystalline inorganic counterparts in more than the fact that in organic solar cells, charge carrier generation is mostly achieved via electron transfer at donor/acceptor interfaces.
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