Abstract
We investigate the absorption of Frenkel excitons in polycrystalline 3,4,9,10-perylene tetracarboxylic dianhydride (PTCDA) thin films, in PTCDA/tris(8-hydroxy) quinoline aluminum multilayers, and in codeposited films in the temperature range from $10\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ by optical transmission spectroscopy. The organic nanostructures are deposited on a Pyrex substrate using organic molecular beam deposition at high vacuum. The measurements provide information about microscopic interactions between molecules and the effect of strain within the organic films. Compared to pure PTCDA films the absorption spectra of multilayers and codeposited films are shifted to higher energy. With decreasing temperature the absorption spectra shift to lower energy, mostly pronounced in pure PTCDA films. The observed energy shifts are qualitatively explained by comparison with a recently developed theoretical model for $\ensuremath{\alpha}$-PTCDA.
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