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revised on 15.06.2020 and posted on 17.06.2020by Kalaivanan Nagarajan, Jino George, Anoop Thomas, Eloïse Devaux, Thibault Chervy, Stefano Azzini, Jouaiti Aziz, Mir Wais Hosseini, Anil Kumar, Cyriaque Genet, Nicola Bartolo, Cristiano Ciuti, Thomas Ebbesen
has been shown that light-matter strong coupling of materials can lead to
modified and often improved properties which has stimulated considerable
interest. While charge transport can be enhanced in n-type organic
semiconductors by coupling the electronic transition and thereby splitting the
conduction band into polaritonic states, it is not clear whether the same
process can also influence carrier transport in the valence band of p-type
semiconductors. Here we demonstrate for the first time that it is indeed
possible to enhance both the conductivity and photoconductivity of a p-type
semiconductor rr-P3HT that is ultra-strongly coupled to plasmonic modes. It is
due to the hybrid light-matter character of the virtual polaritonic excitations
affecting the linear-response of the material. Furthermore, in addition to
being enhanced, the photoconductivity of rr-P3HT shows modified spectral
response due to the formation of the hybrid polaritonic states. This
illustrates the potential of engineering the vacuum electromagnetic environment
to improve the opto-electronic properties of organic materials.