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1 October 2023 On the study of intermolecular charge transfer in aggregated non-fullerene acceptors using electroabsorption spectroscopy
Sudhi Mahadevan, Taili Liu, Sai Wing Tsang
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Proceedings Volume PC12660, Organic, Hybrid, and Perovskite Photovoltaics XXIV; PC126600O (2023) https://doi.org/10.1117/12.2677109
Event: SPIE Organic Photonics + Electronics, 2023, San Diego, California, United States
Abstract
Organic photovoltaic cells (OPVs) using Y-series nonfullerene electron acceptors (NFA) have recently achieved record high efficiencies. However, there is still lack of experimental investigation on how individual molecules and different aggregates of these NFAs contribute to the overall charge transfer (CT) properties. We fabricated solid-solution thin films by dispersing Y-series NFA molecules in insulating polymers at various loading ratios and the CT property has been investigated using electroabsorption (EA) spectroscopy. This study provides direct experimental evidence on the origin of the strong CT character in thin film and brings insight into the correlation between charge transfer and delocalization of wavefunction.
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Sudhi Mahadevan, Taili Liu, and Sai Wing Tsang "On the study of intermolecular charge transfer in aggregated non-fullerene acceptors using electroabsorption spectroscopy", Proc. SPIE PC12660, Organic, Hybrid, and Perovskite Photovoltaics XXIV, PC126600O (1 October 2023); https://doi.org/10.1117/12.2677109
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KEYWORDS
Spectroscopy
Thin films
Excitons
Molecular aggregates
Molecules
Molecular electronics
Organic materials
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