TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No preparation method is given. Preferred Components: The organic N-type semiconductor compound is of formula ((D)-CH=CA2-B1-CA2=CH-(D)) (II-1) or (-CH=CA2-B1-CA2=CH-(C1)-) (II-2), (-CA2=N-E-N=CA2-(C1)-) (II-3), and ((F1)-N=CA2-C1-(-CA2=N-E-N=CA2-(C1)-)n-CA2=N-F1) (II-4). The P-type organic semiconductor compound is of formula (III)A2 = a group consisting of H, F, CN, CF3, COOR1i or CONR1iR1j;R1i, R1j = H or alkyl group;B1 = aryl cyclic group, preferably optionally substituted phenylene group;D = cyclic, (hetero)aryl or organometallic hydrocarbon group (optionally substituted) or a polymer chain, preferably D is indole, carbazole, ferrocenium or naphthalene (all optionally substituted by alkyl), phenylene (optionally substituted by -OC8H13 or -OC12H25), thiophene (optionally substituted by alkyl), or furan (optionally substituted by C12H25);E = (hetero)aryl ring, optionally substituted;F1 = (hetero)aryl ring optionally substituted; eitherR5, R6 = H, OH, alkyl, O-alkyl, or aryl, preferably H while the other group is methyl or phenyl; orR5R6 = polycyclic (hetero)aryl ring structure; andn = 1-15. Preferred Definitions:    A1, A1a = =O; either    R1-R4 = H, F, Cl, CN, -OCH3, -Ophenyl, -O-C6H4-OH or optionally saturated hydrocarbon chain, preferably H, while fourth group represents methyl or phenyl group; or    CR1R2, CR3R4 = benzene, thiophene, thiadiazole, naphthalene, benzothiophene, benzothiazole, naphtothiophene, and/or anthracene (all optionally substituted).    EXAMPLE - 2,5-Diamino-thiophene-3,4-dicarboxylic acid diethyl ester (1.76 g), 3-dodecylthiophene-2,5-dicarboxaldehyde (2.1 g) and tert-butanol (130 ml) were added, under nitrogen atmosphere, in a 250 ml three-neck flask, equipped with a thermometer, a condenser and a magnetic stirrer. The mixture was heated to 50 degrees C and potassium tert-butoxide (0.36 g) was added. The reaction mixture was stirred at this temperature until disappearance of one of reactive groups. The solvents were evaporated under pressure. Then, dichloromethane (20 ml) and methanol (150 ml) were added to the obtained solid. The mixture is filtered, the solid obtained was washed with methanol purification to obtain thiophene compound of formula (A) (3.5 g).