ArticleNature communications2022
Sub-10-fs observation of bound exciton formation in organic optoelectronic devices.
Article in Nature communications, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
What it found
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Who cites it
4 citing papers in PubMed.
- Ultrafast charge-generation dynamics through interfacial energetic modulation for high-performance single-component organic photovoltaics with 14.8% efficiency.Nature communications · 2026Article
- Evidence for Photoinduced Polaron Generation in a High Persistence Length Low Bandgap Conjugated Polymer in Solution.The journal of physical chemistry. B · 2026Article
- Revealing Trapped Carrier Dynamics at Buried Interfaces in Perovskite Solar Cells via Infrared-Modulated Action Spectroscopy with Surface Photovoltage Detection.Advanced materials (Deerfield Beach, Fla.) · 2025Article
- Toward ultrafast soft x-ray spectroscopy of organic photovoltaic devices.Structural dynamics (Melville, N.Y.) · 2024Article
Corrections and comments
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Authors and funding
12 authors.
Funding
Abstract
Fundamental mechanisms underlying exciton formation in organic semiconductors are complex and elusive as it occurs on ultrashort sub-100-fs timescales. Some fundamental aspects of this process, such as the evolution of exciton binding energy, have not been resolved in time experimentally. Here, we apply a combination of sub-10-fs Pump-Push-Photocurrent, Pump-Push-Photoluminescence, and Pump-Probe spectroscopies to polyfluorene devices to track the ultrafast formation of excitons. While Pump-Probe is sensitive to the total concentration of excited states, Pump-Push-Photocurrent and Pump-Push-Photoluminescence are sensitive to bound states only, providing access to exciton binding dynamics. We find that excitons created by near-absorption-edge photons are intrinsically bound states, or become such within 10 fs after excitation. Meanwhile, excitons with a modest >0.3 eV excess energy can dissociate spontaneously within 50 fs before acquiring bound character. These conclusions are supported by excited-state molecular dynamics simulations and a global kinetic model which quantitatively reproduce experimental data.
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Registered trials
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