2025 - Sustainable Industrial Processing Summit
SIPS2025 Volume 9. Intl. Symp on Advanced Materials, Biomaterials, Manufacturing and Quasi-Crystals
| Editors: | F. Kongoli, F. Marquis, N. Chikhradze, T. Prikhna, M. Bechelany, H. Oudadesse, K. Pramanik, R. Das, E. Suhir |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2025 |
| Pages: | 282 pages |
| ISBN: | 978-1-998384-54-9 (CD) |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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HETERO-HALOGEN ISOMERS AS MORPHOLOGY-REGULATING ADDITIVES FOR EFFICIENT ORGANIC SOLAR CELLS
Changduk Yang1;1ULSAN NATIONAL INSTITUTE OF SCIENCE AND TECHNOLOGY, Ulsan, Republic of South Korea;
Type of Paper: Regular
Id Paper: 356
Topic: 43
Abstract:
The efficiency and stability of organic solar cells (OSCs) can be further enhanced through meticulous control of the nanoscale morphology, particularly by employing solvent additive treatments that influence molecular organization and phase behavior. In this work, we introduce a tri-halogenated benzene derivative, 4-chloro-2-fluoroiodobenzene (CFIB), as a multifunctional solvent additive to regulate the active-layer morphology of D18-Cl:N3-based OSCs. The rational design of CFIB—featuring chlorine, fluorine, and iodine substituents—offers a delicate balance of volatility and intermolecular interactions with both donor and acceptor components. This dual functionality allows CFIB to extend the drying time during film formation and to promote favorable crystallization and phase segregation through specific halogen-induced interactions. As a result, CFIB treatment enables the formation of a more ordered and vertically optimized morphology, facilitating efficient charge transport and suppressed nonradiative recombination. The CFIB-treated devices achieve an impressive power conversion efficiency (PCE) of 18.5% and exhibit enhanced operational stability, maintaining a higher fraction of their initial performance compared to the untreated devices. Overall, this study demonstrates that CFIB serves as a simple yet highly effective additive to direct film formation dynamics, providing critical insights into the interplay between volatility, halogenation, and intermolecular interactions in morphological engineering for efficient and stable OSCs.