Temperature-resolved optical spectroscopy of pentacene polymorphs: variation of herringbone angles in single-crystals and interface-controlled thin films

Physical Chemistry Chemical Physics : PCCP
Ingo MeyenburgW Heimbrodt

Abstract

The polarization-resolved absorption spectra are determined for different pentacene polymorphs, both, for thin films grown on ZnO as well as for free-standing single crystals. A clear interrelation between the Davydov splitting of the lowest-energy singlet-exciton type transitions and the herringbone angle of the molecules in the unit cell is found. The variation in oscillator strength of the individual excitonic Davydov components with temperature is explained by a variation of this herringbone angle. The extraordinarily strong variation of the herringbone angle for Campbell phase pentacene films grown on ZnO substrates is attributed to interface-mediated strain due to the different thermal expansion coefficients of the organic and inorganic constituents.

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Citations

Dec 3, 2016·Advanced Materials·Linus PithanStefan Kowarik
Nov 22, 2018·Physical Chemistry Chemical Physics : PCCP·Caterina CocchiClaudia Draxl
Oct 15, 2018·The Journal of Chemical Physics·Linus PithanStefan Kowarik
Jan 27, 2019·Scientific Reports·Nobutaka ShioyaTakeshi Hasegawa

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