Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
Publication date: 30th March 2023
Molecular doping has recently emerged as a valuable tool for improving the performance of high-efficiency organic photovoltaics (OPVs). Compared to their p-type counterparts, studies on n-type doping of bulk heterojunctions in OPVs are still in their infancy, with only a handful of practical demonstrations. This is primarily attributed to the scarcity of n-type dopants with appropriate energetics and functionality. In this work, we introduce two new N-type dopants and apply them to the PM6:BTP-eC9:PC71BM bulk heterojunction (BHJ) OPVs. The dopants resulted in a significant cell efficiency enhancement with a maximum value of 19.03%. We found that the molecular dopants act as microstructure modifiers, at the same time they could also result in affecting the absorption coefficient, charge carrier mobilities, and carrier transit time while suppressing charge recombination. This work demonstrates that molecular doping technology is a promising and simple approach for further improving the performance of next-generation OPVs.
This publication is based upon work supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No: OSR-2018-CARF/CCF-3079, and OSR-2019-CRG8-4095.
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