TECHNOLOGY FOCUS - ELECTRONICS - Preferred Device: The electronic device is an organic thin film transistor comprising a source and a drain; a gate; and a semiconductor film layer positioned between the source and the drain, where the semiconductor film includes the polymer (I). The thin film transistor further comprises carbon nanotubes. The electronic device further comprises a dielectric layer that is provided between a substrate and the semiconductor layer and is surface modified with at least hexamethyldisilazane (HMDS), phenyltrichlorosilane, octyltrichlorosilane (OTS-8), or octadecyltrichlorosilane (ODTS-18). The field-effect mobility is 10-3 to 10 cm2/Vs. The electronic device further comprises optionally substituted fullerence derivative.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The solvent is toluene, xylene, anisole, tetrahydronaphthalene, chlorobenzene, o-dichlorobenzene, chlorobutane, dichloroethane, chloroform, trichloroethane, and/or tetrachloroethane.    TECHNOLOGY FOCUS - POLYMERS - Preparation (disclosed): Preparation of the compound (I) (preferably a compound of formula (Ic)) involves brominating isoindigo chromaphores with extended pi -conjugation of formula (II) under standard conditions to form dibromo compound of formula (III); reacting the dibromo compound (III) with thiophene of formula (IV) using catalyzed Suzuki coupling reaction to obtain dithiophene compound of formula (IV); and then subsequently polymerizing the dithiophene compound (IV) with a catalyst (e.g. FeCl3).M'=a reactive group that depends on the polycondensation reaction.Preferred Compounds: The polymer (I) is selected from 34 compounds, e.g. a compound of formula (Ia) or (Ib). Preferred Composition: The composition comprises 0.1-2 wt.% the polymer (I). Preferred Definitions:    a, b and c=1-5;    Ar1 and Ar2=T1;    R3=-C(R)=C(R)-, (E) or (Z) -C?=C-, or T1;    T1=furan-2,5-diyl, thiophen-2,5-diyl, selenophen-2,5-diyl (all substituted by (R)d), oxazol-2,5-diyl (substituted on 4 position by R), thiazol-2,5-diyl (substituted on 4 position by R), benzo(1,2,5)thiadiazol-4,7-diyl, (1,2,5)thiadiazolo(3,4-c)pyridine-4,7-diyl, benzo(1,2,5)oxadiazol-4,7-diyl, naphthalene-2,6-diyl, 1,4-phenylene, pyridin-2,5-diyl, thiazolo(5,4-d)thiazol-2,5-diyl, dibenzothiophen-3,7-diyl, 3,4,7,8-tetrathia-dicyclopenta(a,e)pentalen-2,6-diyl, 5,10-dithia-indeno(2,1-a)inden-3,8-diyl, 1,6-dithia-dicyclopenta(a,f)naphthalen-2,7-diyl, 3,8-dithia-dicyclopenta(a,f)naphthalen-2,7-diyl, 3,8-dioxa-dicyclopenta(a,f)naphthalen-2,7-diyl, 1,6-dioxa-dicyclopenta(a,f)naphthalen-2,7-diyl, 1,4-diselena-3,6-diaza-pentalen-2,5-diyl, or a group of formulae (ia) to (ih), or (ij) to (is);    d=1 or 2.    At least one of a, b, and c is 1-5, preferably 2 or 3.    EXAMPLE - No suitable example given.