Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.341
Publication date: 7th February 2022
The light harvesting properties of a solar absorber can be modified by the effect of exciton-photon coupling, as a result of the reconfiguration of the electronic structure of the molecules, that can be achieved when the exciton state of the molecule is in resonance with confined electromagnetic field of an optical cavity. Whenever strong or ultra-strong coupling regime is reached, two new hybrid light-matter states, also known as polaritons, are formed with an energy separation that is proportional to the coupling strength.[1] This form of tailoring of the eigenstate of the system represents a compelling tool in photovoltaics, being conversion efficiency, light harvesting directionality and charge transport direct consequences of such modification.
Recently, subphthalocyanine derivatives have been integrated in a polaritonic organic solar cell acting as an optical resonator in order to modify the absorption onset and tune the optoelectronic properties of the devices.[2] In view of this, a comprehensive analysis on how the different electronic transitions of an absorber can be coupled to the resonant modes of a solar polaritonic device is compelling.
Herein, the light harvesting properties of broad band light harvesting molecules operating under weak, strong and ultra-strong coupling regimes are presented. The effect of directional and spectral response, as well as the effect of polaritons on unproductive absorption due to the presence of metallic films in the structure, are discussed in detail.[3,4] These results allow to determinate the optimum configuration to exploit the potential of solar cells devised as optical resonators.
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