The present invention relates to solutions and/or dispersions of organic semiconductors in a solvent mixture of at least two different organic solvents, characterized in that

A. Each of the solvents on its own has a boiling point of below 200 C. and a melting point of 15 C. or less,

B. at least one of the solvents has a boiling point in the range from greater than 140 to less than 200 C.,

C. the solvents used have no benzylic CH₂ or CH groups,

D. the solvents used are not benzene derivatives containing tert-butyl substituents or more than two methyl substituents,

and their use in printing processes for producing layers of organic semiconductors, especially for the electronics industry.