期刊
PHYSICAL REVIEW LETTERS
卷 124, 期 17, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.177401
关键词
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资金
- Charles E. Kaufman Foundation
- DARPA [D19AC00011]
- NSF [DMR-1654077]
- European Research Council (ERC) [714586]
- University of Bern
- Swiss National Science foundation [200020_184819]
- European Research Council (ERC) [714586] Funding Source: European Research Council (ERC)
- Swiss National Science Foundation (SNF) [200020_184819] Funding Source: Swiss National Science Foundation (SNF)
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.
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