TECHNOLOGY FOCUS - ELECTRONICS - Preferred Process: The process (P1) involves depositing on the surface of the substrate at least one compound (S1) capable of binding to the surface of the substrate and of binding perylene diimide compound (I). In the process (P1), the perylene diimide compound (I) is applied to the substrate by physical vapor deposition. The temperature of the substrate material during the deposition is less than the temperature corresponding to the vapor pressure. The temperature of the substrate material during the deposition is 20-250 (preferably 50-200) degrees C. The perylene diimide compound (I) is applied to the substrate in a layer, having an average thickness of 10-1000 (preferably 15-350) nm. The perylene diimide compound (I) is applied in at least partly crystalline form. The perylene diimide compound (I) is applied to the substrate in form of a thin film. The perylene diimide compound (I) is employed that results from purification by sublimation, physical vapor transport and/or recrystallization. Preferred Component: The organic field-effect transistor (T1) is in the form of a thin film transistor.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compound: The compound (S1) is selected from alkyltrialkoxysilanes (preferably n-octadecyl trimethoxysilane or n-octadecyl triethoxysilane). The compound (S1) is selected from hexaalkyldisilazanes (preferably hexamethyldisilazane). Preferred Definitions:    n=1 or 2;    Ra and Rb=benzen-1-yl, pyridin-4-yl, pyrimidin-2-yl, (1,3,5)triazin-2-yl, benzen-1-yl substituted by (Rh)x, benzen-1-yl substituted by (ORi)x, benzen-1-yl substituted by (SRi)x, pyridin-4-yl substituted by (Rh)y, pyridin-4-yl substituted by (ORi)y, pyridin-4-yl substituted by (SRi)y, pyrimidin-2-yl substituted by (Rh)z, pyrimidin-2-yl substituted by (ORi)z, pyrimidin-2-yl substituted by (SRi)z, (1,3,5)triazin-2-yl substituted by (Rh)w, (1,3,5)triazin-2-yl substituted by (ORi)w or (1,3,5)triazin-2-yl substituted by (SRi)w;    Rh=1-3C alkyl, 1-3C fluoroalkyl, fluorine, chlorine, bromine, NE1E2, nitro or cyano;    E1 und E2=H, alkyl, cycloalkyl, heterocycloalkyl, aryl or hetaryl;    Ri=1-3C alkyl;    x=1-5;    y=1-4;    z=1-3;    w=1 or 2.    SPECIFIC COMPOUNDS - Use of 2,9-dimethyl-anthra(2,1,9-def;6,5,10-d'e'f')diisoquinoline-1,3,8,10-tetraone (Ia) and 2,9-diphenethyl-anthra(2,1,9-def;6,5,10-d'e'f')diisoquinoline-1,3,8,10-tetraone are specifically claimed as the perylene diimide compound (I).