Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
The quantification of quasi-Fermi level splitting (QFLS) in organic photovoltaic devices would provide researchers with much needed information about the origins of non-radiative losses to the open circuit voltage. Difficulties in measuring the QFLS in the bulk of organic semiconductors (OSC's) arise due to the excitonic nature of photoexcitation in OSC's and non-radiative electrode-induced photovoltage losses occurring at the interface between an organic active-layer and the bordering electrode layers. Here a novel experimental technique called electro-modulated photoluminescence quantum yield is introduced, which quantifies the QFLS within the bulk of OSC devices at operational conditions regardless of electrode-induced losses. Drift-diffusion simulations are used to validate the technique. The QFLS is quantified for PM6:Y6 active layer devices and is shown to be independent of both device architecture and varying total non-radiative losses.
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International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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