Polaron Photoconductivity in the Weak and Strong Light-Matter Coupling Regime

Krainova, Nina; Grede, Alex J.; Tsokkou, Dimitra; Banerji, Natalie; Giebink, Noel C. (2020). Polaron Photoconductivity in the Weak and Strong Light-Matter Coupling Regime. Physical Review Letters, 124(17), p. 177401. 10.1103/PhysRevLett.124.177401

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We investigate the potential for cavity-modified electron transfer in a doped organic semiconductor through the photocurrent that arises from exciting charged molecules (polarons). When the polaron optical transition is strongly coupled to a Fabry-Perot microcavity mode, we observe polaron polaritons in the photoconductivity action spectrum and find that their magnitude depends differently on applied electric field than photocurrent originating from the excitation of uncoupled polarons in the same cavity. Crucially, moving from positive to negative detuning causes the upper and lower polariton photocurrents to swap their field dependence, with the more polaronlike branch resembling that of an uncoupled excitation. These observations are understood on the basis of a phenomenological model in which strong coupling alters the Onsager dissociation of polarons from their dopant counterions by effectively increasing the thermalization length of the photoexcited charge carrier.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Tsokkou, Dimitra and Banerji, Natalie

Subjects:

500 Science > 540 Chemistry

ISSN:

0031-9007

Funders:

[18] European Research Council
[4] Swiss National Science Foundation

Language:

English

Submitter:

Olivier Nicolas Ludovic Bardagot

Date Deposited:

25 Aug 2020 11:03

Last Modified:

26 Aug 2020 14:16

Publisher DOI:

10.1103/PhysRevLett.124.177401

Related URLs:

Additional Information:

Funders:
European Union (EU) - Horizon 2020: ERC-STG, Acronym: OSIRIS, Grant number: 714586
Swiss National Science Foundation - Type: Project Funding, Grant number: 200020_184819
University of Bern

BORIS DOI:

10.7892/boris.146052

URI:

https://boris.unibe.ch/id/eprint/146052

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