Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
DOI: https://doi.org/10.29363/nanoge.hopv.2023.174
Publication date: 30th March 2023
In recent years, organic solar cells based on Y-family NFAs have surpassed 18% efficiency. However, these are typically demonstrated for lab-scale devices processed with halogenated solvents such as chloroform and chlorobenzene, with limited compatibility with scalable fabrication methods due to their environmental toxicity. Considering the latter and owing to the importance of processing solvents in modulating the blend microstructure, a key strategy is to develop solar cells that can be processed from greener solvents, by using molecules designed for increased solubility.
Moreover, there is still a large performance gap between spin-coated, lab-scale devices and large-scale modules. This is due in part to the challenges in maintaining an optimal active layer morphology when switching to industrial fabrication techniques. Contributing factors include thickness constraints, drastically different drying kinetics, and temperature-dependent aggregation. To bridge this gap, it is paramount to understand the interplay among processing, microstructure, thin film properties, and charge carrier kinetics of devices made with scalable techniques, such as blade coating and slot-die coating, and comparing them to their spin-coated counterparts.
In this work, we demonstrate highly efficient organic solar cells fabricated with spin-coating, blade coating, and slot-die coating techniques, using PM6 and Y12 in o-xylene as electron donor and electron acceptor materials, respectively. In particular, we obtain above 14% PCE in slot-die coated devices, comparable to lab-scale devices.
We then investigate the differences and similarities between these techniques with a variety of optoelectronic techniques, including transient photovoltage and charge extraction, to compare charge carrier dynamics.
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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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