Imperial College London
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Prof John W.G. Tisch

Faculty of Natural Sciences, Department of Physics

Professor of Laser Physics
 
 
 
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Contact

 

+44 (0)20 7594 7710john.tisch Website

 
 
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Assistant

 

Ms Judith Baylis +44 (0)20 7594 7713

 
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Location

 

205Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Maimaris:2022:10.1038/s41467-022-32478-8,
author = {Maimaris, M and Pettipher, AJ and Azzouzi, M and Walke, DJ and Zheng, X and Gorodetsky, A and Dong, Y and Tuladhar, Shakya P and Crespo, H and Nelson, J and Tisch, J and Bakulin, A},
doi = {10.1038/s41467-022-32478-8},
journal = {Nature Communications},
title = {Sub-10-fs observation of bound exciton formation in organic optoelectronic devices},
url = {http://dx.doi.org/10.1038/s41467-022-32478-8},
volume = {13},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - 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.
AU  - Maimaris,M
AU  - Pettipher,AJ
AU  - Azzouzi,M
AU  - Walke,DJ
AU  - Zheng,X
AU  - Gorodetsky,A
AU  - Dong,Y
AU  - Tuladhar,Shakya P
AU  - Crespo,H
AU  - Nelson,J
AU  - Tisch,J
AU  - Bakulin,A
DO  - 10.1038/s41467-022-32478-8
PY  - 2022///
SN  - 2041-1723
TI  - Sub-10-fs observation of bound exciton formation in organic optoelectronic devices
T2  - Nature Communications
UR  - http://dx.doi.org/10.1038/s41467-022-32478-8
UR  - http://hdl.handle.net/10044/1/98875
VL  - 13
ER  -
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