AbstractEvaporated dye layers are gaining in importance in modern information and energy storage systems due to their specific optical and electrical properties. The photophysical properties decisively depend on the structure of layers, e.g., on a kind of aggregation, degree of crystallinity and crystal modification. These parameters and, therefore, the properties can be strongly manipulated by technological parameters (kind and temperature of substrate, evaporation rate, annealing) and by coevaporated admixtures of inorganic (metal halides or oxides) or organic (dyes or others) compounds.On the basis of recent investigations of evaporated merocyanine and phthalocyanine dyes, some results of the relationship between deposition are presented technology, structure and photophysical properties and evaluated with regard to their usefulness in organic solar cells.