AI Article Synopsis
- * Using advanced techniques like time-resolved X-ray absorption spectroscopy, researchers analyze the dynamics when excitons are created by a quick optical pulse.
- * Findings reveal that the initial excitonic state is spread out across several polymer chains and quickly transitions into a more localized state in under 50 femtoseconds, which is crucial for enhancing charge transfer efficiency.
Article Abstract
The localization dynamics of excitons in organic semiconductors influence the efficiency of charge transfer and separation in these materials. Here we apply time-resolved X-ray absorption spectroscopy to track photoinduced dynamics of a paradigmatic crystalline conjugated polymer: poly(3-hexylthiophene) (P3HT) commonly used in solar cell devices. The π→π transition, the first step of solar energy conversion, is pumped with a 15 fs optical pulse and the dynamics are probed by an attosecond soft X-ray pulse at the carbon K-edge. We observe X-ray spectroscopic signatures of the initially hot excitonic state, indicating that it is delocalized over multiple polymer chains. This undergoes a rapid evolution on a sub 50 fs timescale which can be directly associated with cooling and localization to form either a localized exciton or polaron pair.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9198071 | PMC |
| http://dx.doi.org/10.1038/s41467-022-31008-w | DOI Listing |
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