Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
Publication date: 30th March 2023
Investigations into the charge transport layers used within organic photovoltaics (OPV) can help us in finding ways to improve device efficiency and stability. In particular, dedicated charge transport layers have the purpose of aiding in selective charge transport to the respective electrodes. Care has to be taken to ensure advantageous energy level alignment, resulting in minimised losses in solar cell device performance. Though the more commonly used electron transport layer materials in OPV, such as metal oxides, exhibit satisfactory optical and electronic properties, there is limited control over their energy-level matching within a device. Additionally, the stability of many of these materials, particularly under ultraviolet irradiation, is a limiting factor.
This study investigates the use of an electronically and energetically tuneable, fullerene-derived electron transport layer for OPV. These films exhibit a reduction in solubility once they are treated by specific annealing conditions, which intriguingly allows for non-orthogonal-solvent based films to be processed on top of these layers. We investigated these films with respect to their conductivity as well as energetic properties and were able to tune these properties via the use of an electron-donating additive. It was observed that with an increased additive concentration, the conductivity increased while at the same time the physical film quality improved. Furthermore, the use of the additive led to a shift in the position of the Fermi level toward the lowest unoccupied molecular orbital, ultimately improving the energy level matching of the layer within the device stack. A series of stability studies are currently being conducted[1] to test the lifetime of OPV devices in comparison to those using a typical zinc oxide electron transport layer. From intial results, the use of an organic transport layer has yielded more stable devices.
I would like to acknowledge Seth Marder and the Marder group for helping in this work with regards to chemical synthesis, as well as the entire Photovoltaics and Optoelectronics group, Oxford and the Adavnced Functional Materials and Devices group Oxford. Finally, I'd also like to acknowledge the Meerholz group in Cologne for allowing me to complete my UPS studies in collaboration with Dr. Selina Olthof.
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International Conference on Hybrid and Organic Photovoltaics
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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