Exciton properties of selected aromatic hydrocarbon systems
classification
❄️ cond-mat.mtrl-sci
keywords
excitationexcitonshydrocarbonincreasingacene-typearomaticcharge-transferchrysene
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We have examined the singlet excitons in two representatives of acene-type (tetracene and pentacene) and phenacene-type (chrysene and picene) molecular crystals, respectively, using electron energy-loss spectroscopy at low temperatures. We show that the excitation spectra of the two hydrocarbon families significantly differ. Moreover, close inspection of the data indicates that there is an increasing importance of charge-transfer excitons at lowest excitation energy with increasing length of the molecules.
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