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Polariton-Assisted Excitation Energy Channeling in Organic Heterojunctions

submitted on 09.09.2020, 11:45 and posted on 09.09.2020, 12:39 by Mao Wang, Manuel Hertzog, Karl Börjesson
Exciton-polaritons are hybrid light-matter states resulting from strong exciton-photon coupling. The wave function of the polariton is a mixture of light and matter, enabling long-range energy transfer between spatially separated chromophores. Moreover, their delocalized nature, inherited from the photon component, has been predicted to enhance exciton transport. Here, we strongly couple an organic heterojunction consisting of energy/electron donor and acceptor materials to the same cavity mode. Using time-resolved spectroscopy and optoelectrical characterization, we show that the rate of exciton harvesting is enhanced with one order of magnitude and the rate of energy transfer in the system is increased two- to threefold in the strong coupling regime. Our results exemplify two means of efficiently channeling excitation energy to a heterojunction interface, where charge separation can occur. This study opens a new door to increase the overall efficiency of light harvesting systems using the tool of strong light-matter interactions.


Email Address of Submitting Author


University of Gothenburg



ORCID For Submitting Author


Declaration of Conflict of Interest

no conflict of interest

Version Notes

the first version