TECHNOLOGY FOCUS - ELECTRONICS - Preferred Component: The organic thin-film transistor has organic-semiconductor layer used as electric current path between source electrode (5) and drain electrodes, and gate electrode (4) which controls the amount of electric current which passes along the side of the electric current path. The organic-semiconductor layer contains conjugated type-compound.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (disclosed): Halogenated component is reacted with monomer using organic base in presence of solvent at 50-160 degrees C for 5 minutes to 200 hours and purified, to obtain conjugated type-compound. Preferred Component: The fluorine containing aromatic group of formula (I) is preferable fluorine containing aromatic group of formula (III). The fluorine containing aromatic group of formula (II) is preferable fluorine containing aromatic group of formula (IV). The conjugated type-compound having two or more fluorine containing aromatic group (III) is conjugated type-compound of formula (A), and conjugated type-compound having two or more fluorine containing aromatic group (II) is conjugated type-compound of formula (B). The nitrogen-containing condensed ring compound (a) is preferably of formula (b). The nitrogen-containing condensed ring polymer has repeating unit of formula -Ar21 or diamine repeating unit of formula (i).R0=H, 1-20C alkyl or 1-20C alkoxy;at least one of Z1,Z1'=-C(-R3)=C(-R4)- and other is -S-, -O-, -C(-R5)=N-, -N(-R6)-, -S(=O)-, -S(=O)2, -Se- or -Te-;Ar1-Ar6=Ar, Ar1-Ar3 is preferably thienylene group optionally having substituent and which does not contain fluorine;Ar21=bivalent aromatic hydrocarbon, bivalent heterocyclic or furan group of formula (ii);Z23=Z21;R10=H, fluorine, 1-20C alkyl, 1-20C fluoroalkyl, 1-20C alkoxy or 1-20C fluoroalkoxy;Z2=-C(-R13)=C(-R14)-, -S-, -O-, -C(-R15)=N-, -N(-R16)-, -S(=O)-, -S(=O)2, -Se- or -Te-, preferably -S-;R3-R6,R13-R16, R27,R28=H, halogen or monovalent group in which R3 and R4, R13 and R14 and R27 and R28 optionally couple to form a ring;andm,n,p,q,r,s=0-6. SPECIFIC COMPOUNDS - 18 Specific nitrogen-containing condensed ring compounds are disclosed such as 3,4-dithia-1,6-diaza-cyclopenta(a)pentalen-7-one (I-A), 2,5-dimethyl-3,4-dithia-1,6-diaza-cyclopenta(a)pentalen-7-one, 2-acetyl-5-(1-hydroxy-ethyl)-3,4-dithia-1,6-diaza-cyclopenta(a)pentalen-7-one, 2,5-bis-(4-fluoro-phenyl)-1,2-dihydro-3,4-dithia-1,6-diaza-cyclopenta(a)pentalen-7-one and 2,5-Bis-pentafluorophenyl-1,2-dihydro-3,4-dithia-1,6-diaza-cyclopenta(a)pentalen-7-one.    EXAMPLE - 1,3-Dibromo-5,5-difluoro-4H-cyclopenta (c) thiophene 4,6(5H)-dione (in mg) (26) and tetrakis(triphenylphosphine)palladium (17) were mixed at 120 degrees C for 12 hours and cooled at room temperature. The solvent in the reaction mixture was depressurizing distilled and the residue was subjected to alumina-column chromatography, to obtain yellow solid compound (33). The organic thin film element obtained by using the yellow solid compound had excellent transistor characteristics and favorable mobility.