TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: The OSC compound is dissolved in the solvent or solvent blend at a concentration of 0.005-50 wt.%. The boiling point of the solvent, or of the lowest boiling solvent of the solvent blend, is greater than 130 degrees C at atmospheric pressure. The viscosity of the solvent or solvent blend is greater than 50 cP at 25 degrees C. In process, log P of the solvent, or the weighted average log Pw of the solvent blend is greater than 2.5. The surface tension of the solvent or solvent blend, without any additives, is greater than 15 dyne/cm and less than 80 dyne/cm. Preferred Components: The OSC compounds are substituted polyacenes or poly(3-substituted thiophene), preferably silane compound of formula (A1). The partition ratio c log P of the solvent, or the weighted average (c log P)w of the solvent blend, without any additives, is greater than 1.5, the viscosity of the solvent or the solvent blend, without any additives, is greater than 10 cP at 25 degrees C, and the boiling point of the solvent or the solvent blend, without any additives, is less than 400 degrees C at a pressure of 1 Torr.one of Y1, Y2 = -CH= or =CH- and the other denotes -X-;one of Y3, Y4 = -CH= or =CH- and the other denotes -X-;X = -O-, -S-, -Se- or-NR3-;R = cyclic, straight-chain or branched alkyl or alkoxy having 1-20C, preferably 1-8C, or 2-30C aryl, (both optionally fluorinated or perfluorinated, with SiR3 preferably being trialkylsilyl);R1 = H, F, Cl, Br, I, CN, alkyl or alkoxy having 1-20C, preferably 1-8C (both are optionally fluorinated or perfluorinated, optionally fluorinated or perfluorinated aryl having 6-30C, preferably C6F5, or CO2R2, with R2 being H, optionally fluorinated alkyl having 1-20C, or optionally fluorinated aryl having 2-30C, preferably 5-20C);R3 = H (preferred) or 1-10C cyclic alkyl; andm, o = 0-1.Provided that, if X is S, R1 is not hydrogen. EXAMPLE - Mixture of 2,8-difluoro-5,11-bis-triethylsilanylethynyl-1,9-dithia-dicyclopenta(b,i)anthracene and 2,8-difluoro-5,11-bis-triethylsilanylethynyl-1,7-dithia-dicyclopenta(b,i)anthracene (1 wt.%) was dissolved in alpha -terpineol to give formulation.