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Theory of Stark spectroscopy transients from thin film organic semiconducting devices

MacKenzie, Roderick C. I.; G�ritz, Anna; Greedy, Steve; von Hauff, Elizabeth; Nelson, Jenny

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Authors

Roderick C. I. MacKenzie

Anna G�ritz

Elizabeth von Hauff

Jenny Nelson



Abstract

Herein, we propose a model to describe picosecond-nanosecond charge separation and nongeminate recombination in organic semiconductors. The model is used to explain time-resolved electroabsorption (EA) measurements performed on diodes made from phenyl-C61-butyric acid methyl ester. We find that the measured shape of the EA transient is due to a combination of microscopic carrier dynamic effects such as carrier trapping, as well as macroscopic effects such as band bending caused by the nonuniform poloron generation profile across the device. We demonstrate that the initial fast phase of the EA transient is due to hot free carriers being able to move freely within the device; over time these hot free carriers cool and become trapped giving rise to the second slower phase of the transient. We further show that the commonly observed dependence of the EA signal on probe wavelength can be explained in terms of the spatial overlap of electrostatic potential within the device and the optical mode of the probe light. Finally, we discuss the implications of these results for pump-probe experiments on thin organic films.

Journal Article Type Article
Acceptance Date May 5, 2014
Online Publication Date May 21, 2014
Publication Date May 21, 2014
Deposit Date Oct 31, 2018
Publicly Available Date Oct 31, 2018
Journal Physical Review B
Print ISSN 1098-0121
Electronic ISSN 1550-235X
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 89
Article Number 195307
Pages 1-9
DOI https://doi.org/10.1103/physrevb.89.195307
Public URL https://nottingham-repository.worktribe.com/output/1212962
Publisher URL https://journals.aps.org/prb/abstract/10.1103/PhysRevB.89.195307

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