TECHNOLOGY FOCUS - ELECTRONICS - Preferred Components: The polymeric semiconductor component is photoactive and the polymer is present in a blend material, where the polymer is function as an electron-donor compound and the blend material further comprises an electron-acceptor compound. The electron-acceptor compound is a fullerene compound or electron-transporting polymer. The electron-transporting polymer comprises a bis(imide)arene unit, preferably naphthalene.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No preparation method is given.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: (A) and (D1) form alternating repeat units. The polymer is random copolymer having substituted 2-thiophen-2-yl-dithieno(3,2-c;2',3'-e)azepine-4,6-dione compounds of formula (p1). (D1): comprises at least one optionally substituted electron-rich 5-20 membered heteroaryl or optionally substituted electron-rich 8-20 membered polycyclic heteroaryl; and is substituted thiophene compounds of formula (d1).B1 = optionally substituted electron-rich 8-20 membered polycyclic heteroaryl, a linear conjugated or substituted thiophene moiety of formula (b1);R1c = H, Cl or 1-20C alkyl;m = 0 or 1;p = 0-4, preferably 1 or 2;x, y = 0.05-0.95; andx+y = 1.Provided that p is not 0 when m is 0. Preferred Definitions:    Ar1 = phenyl, thienyl, thiazolyl, isothiazolyl, thiadiazolyl, furyl, oxazolyl, isoxazolyl, oxadiazolyl, pyrrolyl, triazolyl, tetrazolyl, pyrazolyl, imidazolyl, pyridyl, pyrimidyl, pyridazinyl or pyrazinyl (all optionally substituted with 1-5 halo, -CN or L1R1), benzo(b)thiophenyl, naphtho(2,3-b)thiophenyl, benzo(1,2-b;5,4-b')dithiophenyl, benzo(1,2-b;4,5-b')dithiophenyl, thieno(2,3-b)thiophenyl, dithieno(2,3-b;3',2'-d)thiophenyl, dithieno(2,3-b;3',4'-d)thiophenyl, benzo(b)thieno(3,2-d)thiophenyl, thieno(3,2-b)thiophenyl, dithieno(3,2-b;2',3'-d)thiophenyl, dithieno(3,2-b;3',4'-d)thiophenyl or benzo(b)thieno(2,3-d)thiophenyl (all optionally substituted with halo, -CN or L1R1);    L1 = -O-, -S-, -Se-, -C(O)-, -OC(O)-, -C(O)O- or covalent bond;    R1 = 1-40C alkyl, alkenyl, 2-40C alkynyl or 1-40C haloalkyl; and    L = covalent bond.    EXAMPLE - No suitable example given.