TECHNOLOGY FOCUS - ELECTRONICS - Preferred Method: An organic thin film is formed with the fluorine-containing polymer, by vacuum evaporation method, spin-coat method, inkjet printing method, dispenser printing method, flexographic-printing method, nozzle-coat method or capillary coat method. Preferred Arrangement: A transistor (100) consists of a source electrode (5), a drain electrode (6), organic-semiconductor layer provided between the electrodes (5 and 6), and a gate electrode (4). The organic-semiconductor layer consists of the organic thin film.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (disclosed): A benzene-containing compound of formula (I) is reacted with a fluorinating agent, to obtain fluorine-containing polyaromatic compound (1).Z1,Z2=-C(-R7)=C(-R8)-, -C(-R9)=N-, -N(-R10)-, -O-, -S-, -S(=O)-, -S(=O)2-, -Se- or -Te-;R7-R10=same as R1;andm=2-500.Preferred Compound: The fluorine-containing polyaromatic compound is of formula (2).    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: A polymer has polyaromatic compound-containing repeating unit of formula (3, preferably 4) and a bivalent group-containing repeating unit of formula: -(Ar3)- (5).s2,t2=1 or more;Ar3=bivalent aromatic hydrocarbon group, or bivalent heterocyclic group of formula (6);R11,R12=same as R1;andZ3=same as Z1.R11 and R12 are optionally combined to form a ring. Preferred Definitions:    Z1,Z2=-C(-R7)=C(-R8)-;    R1,R2=fluorine;and    Z3=-S-.    SPECIFIC COMPOUNDS - The fluorine-containing polyaromatic compound is chosen from 10 disclosed compounds, such as 6,6,12,12-tetrafluoro-2,8-bis-(4-fluoro-phenyl)-6,12-dihydro-indeno(1,2-b)fluorene of formula (A), 1-(4-(8-(4-acetyl-phenyl)-6,6,12,12-tetrafluoro-6,12-dihydro-indeno(1,2-b)fluoren-2-yl)-phenyl)-ethanone, 2,8-bis-(4-(1,1-difluoro-ethyl)-phenyl)-6,6,12,12-tetrafluoro-6,12-dihydro-indeno(1,2-b)fluorine, 6,6,12,12-tetrafluoro-2,8-bis-(4-trifluoromethyl-phenyl)-6,12-dihydro-indeno(1,2-b)fluorine and 6,6,12,12,6',6',12',12'-octafluoro-6,12,6',12'-tetrahydro-(2,2')bi(indeno(1,2-b)fluorenyl)-8,8'-dicarbonyl difluoride.    EXAMPLE - 6,6,12,12-Tetrafluoro-2,8-diiodo-6,12-dihydro-indeno(1,2-b)fluorine (in mg) (50), 4-fluoro phenylboronic acid (38), tetrakis(triphenylphosphine)palladium (10), sodium carbonate (29), 1,2-dimethoxyethane (2 ml) and water (0.5 ml) were reacted at 80 degrees C, under nitrogen atmosphere. After 24 hours, water was added, and the reaction mixture was extracted with chloroform. The obtained organic layer was concentrated under reduced pressure, dried using magnesium sulfate, and purified by silica gel column chromatography to obtain 6,6,12,12-tetrafluoro-2,8-bis-(4-fluoro-phenyl)-6,12-dihydro-indeno(1,2-b)fluorene (32) of formula (A) with yield of 37%. A polymer formed using the obtained polyaromatic compound, had excellent electron transport property.