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.degree. C. and a melting point of 15.degree. 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.degree. C., C. the solvents used have no benzylic CH.sub.2 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.