期刊
NATURE COMMUNICATIONS
卷 13, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41467-022-31008-w
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资金
- UK Engineering and Physical Sciences Research Council [EP/R019509/1, EP/T006943/1, EP/V026690]
- MURI (EPSRC/DSTL) [EP/N018680/1, EP/I032517/1]
- ERC Advanced Grant ASTEX
- EPSRC [EP/L016524/1]
- Marie Sklodowska-Curie grant [641272]
- Marie Curie Initial Training Network [EC317232]
- Natural Sciences and Engineering Research Council of Canada (NSERC) [PGSD3-454096-2014]
- Royal Society
- Leverhulme Trust
- EPSRC [EP/I032517/1] Funding Source: UKRI
This study tracks the dynamics of excitons in organic semiconductors using time-resolved X-ray absorption spectroscopy. The localization dynamics of excitons were found to influence the efficiency of charge transfer and separation, and a rapid evolution process of excitonic states was observed.
A detailed understanding of ultrafast exciton dynamics is crucial for improving the efficiency of organic light-harvesting-devices. Here, the authors track exciton localization on a sub-50 fs timescale in an organic semiconductor using time resolved soft x-ray absorption spectroscopy. 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 pi ->pi* 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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