Proceedings of Online International Conference on Hybrid and Organic Photovoltaics (OnlineHOPV20)
DOI: https://doi.org/10.29363/nanoge.onlinehopv.2020.016
Publication date: 22nd May 2020
The electronic structure and exciton dynamics of the molecules and polymers that form the active layer in organic electronic devices can change dramatically during solution deposition and subsequent annealing processes. As solvent vaporizes or as heat is applied, molecules aggregate and rearrange themselves, changing their electronic coupling. This can dramatically change the exciton dynamics in the material and thus the suitability of the material for electronic devices. The exciton dynamics of molecules in solution and in films of aggregates can be measured using transient absorption spectroscopy. However, the progression of exciton dynamics during film formation and annealing is unknown since measurements typically cannot be performed quickly enough to collect accurate transient absorption spectra of these species. The exciton dynamics of evolving material systems can be measured by increasing the speed of data collection. A novel implementation of transient absorption spectroscopy is introduced that can measure transient spectra with up to a 60 ps pump-probe time delay in one shot. The exciton dynamics of intermediate aggregation states are revealed during the formation and annealing of an organic film. The information gained using this technique can be used to modify environmental parameters during the film formation process to kinetically trap aggregates with exciton dynamics tailored for particular types of electronic devices.
This material is based upon work supported by the National Science Foundation under Grant No. 1752129.
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