Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
DOI: https://doi.org/10.29363/nanoge.hopv.2023.135
Publication date: 30th March 2023
Organic photovoltaic technologies are getting more and more mature. Photoconversion efficiencies are now reaching more than 18 % at laboratory scale with binary systems. However, interesting results can be missed due to the quality of organic semiconductors. Those materials are commonly prepared from palladium-catalyzed polycondensation reaction. With a lack of purification, impurities present in bulk heterojunction, in particular in polymers, can induce severe loss of performances. For example, Bracher et al. demonstrates that remaining metallic nanoparticles from catalyst can induce current shunts within the device [1]. Liu et al. reported polymer degradation assisted by palladium [2]. Moreover, Schopp et al. recently proved that catalyst remaining traces can affect organic photovoltaic devices by affecting charge carriers [3]. Here we want first to present that not only palladium catalysts but also their ligands can affect solar cells efficiency and stability. For this purpose, a series of reaction residues have been investigated and were classified as detrimental or inert towards the device performances. In a second time, to improve our bench mark, we added interfacial buffer layers as recommended by Li et al. [4], i.e. IC‑SAM and C70, to protect our active layer. As a consequence, we observed, first, an improvement of the performances and better stability and second, low impurity concentration effects that were hidden before are now observable in this improved architecture.
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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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