Nature of Optical Excitations in Porphyrin Crystals: A Joint Experimental and Theoretical Study.

ABSTRACT: The nature of optical excitations and the spatial extent of excitons in organic semiconductors, both of which determine exciton diffusion and carrier mobilities, are key factors for the proper understanding and tuning of material performances. Using a combined experimental and theoretical approach, we investigate the excitonic properties of meso-tetraphenyl porphyrin-Zn(II) crystals. We find that several bands contribute to the optical absorption spectra, beyond the four main ones considered here as the analogue to the four frontier molecular orbitals of the Gouterman model commonly adopted for the isolated molecule. By using many-body perturbation theory in the GW and Bethe-Salpeter equation approach, we interpret the experimental large optical anisotropy as being due to the interp

SUBMITTER: Palummo M 

PROVIDER: S-EPMC8023704 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature