Sub-10-fs observation of bound exciton formation in organic optoelectronic devices

Marios Maimaris, Allan J. Pettipher, Mohammed Azzouzi, Daniel J. Walke, Xijia Zheng, Andrei Gorodetsky, Yifan Dong, Pabitra Shakya Tuladhar, Helder Crespo, Jenny Nelson, John W. G. Tisch and Artem A. Bakulin ()
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Marios Maimaris: Imperial College London
Allan J. Pettipher: Imperial College London
Mohammed Azzouzi: Imperial College London
Daniel J. Walke: Imperial College London
Xijia Zheng: Imperial College London
Andrei Gorodetsky: Imperial College London
Yifan Dong: Imperial College London
Pabitra Shakya Tuladhar: Imperial College London
Helder Crespo: Imperial College London
Jenny Nelson: Imperial College London
John W. G. Tisch: Imperial College London
Artem A. Bakulin: Imperial College London

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: 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.

Date: 2022
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DOI: 10.1038/s41467-022-32478-8

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