Abstract
Interpretation of the physical mechanisms that are crucial for the understanding of theoretical approaches used to reproduce the electro-absorption (EA) spectra of organic molecular crystals is built step by step from the simplest case of an individual molecule, through a model dimer, then a crystal, and finally a film viewed as a disordered assembly of microscopically well ordered crystallites. The two-state model is used throughout to gain qualitative insight into the discussed effects. As an illustrative example, the calculations performed for sexithiophene where all the discussed effects are operative, are briefly discussed.
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