TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The component comprises (a) a substrate made of glass or polymeric materials, preferably polyimide, polyalkylene or polyester, (b) a first electrode made of indium tin oxide, zinc oxide or titanium oxide, deposited on the substrate, (c) a layer of the copolymer or the substance mixture, deposited on the first electrode, (d) a second electrode made of lithium fluoride-aluminum system, calcium, poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate or molybdenum, deposited on the layer of the copolymer or the substance mixture, and optionally (e) a protective layer deposited on the second electrode. A layer of a conducting polymer, preferably poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate, is deposited between the first electrode and the layer of the copolymer or the substance mixture. The layer of the copolymer or the substance mixture exhibits a layer thickness of 20-1000 nm, preferably 50-500 nm. The layer of the conducting polymer exhibits a layer thickness of 10-100 nm, preferably 20-50 nm. The first- and/or the second electrode exhibit a layer thickness of 10-1000 nm, preferably 50-500 nm. The component is a photovoltaic module, a field-effect transistor or a diode.    TECHNOLOGY FOCUS - POLYMERS - Preparation (Claimed): The preparation of the copolymer, comprises (i) polymerizing dithiophene compounds of formula (Y1-A-Y1) (VI) with a mixture of halogen compounds of formula (G-B1-G) (VII) and (G-C1-G) (VIII) under the influence of a catalyst by cross-coupling, (ii) polymerizing thia-aromatic compounds of formula (Y1-B1-Y1) (IX) with a mixture of halogen compounds of formula (G-A-G) (X) and (VIII) under the influence of a catalyst by cross-coupling, or (iii) polymerizing thia-aromatic compounds of formula (Y1-C1-Y1) (XI) with a mixture of (X) and (VII) under the influence of a catalyst by cross-coupling.G = Cl, Br, I or pseudohalo, preferably triflate or tosylate; andY1 = stannyl, boronic acid, boronic ester group or Zn-G.Preferred Components: The copolymer comprises 5-89.9 mole%, preferably 40-50 mole% (I), 55-10 mole%, preferably 25-49 mole% (II) and 40-0.1 mole%, preferably 25-1 mole% (III). The copolymer comprises 99-30 mole%, preferably 92.5-75 mole% dithiophene-thia-aromatic units of formula (A-B1) (IV) or 1-70 mole%, preferably 7.5-25 mole% dithiophene-thia-aromatic units of formula (A-C1) (V). EXAMPLE - 301.7 mg 4,7-Dibromo-5-fluoro-2,1,3-benzothiadiazole, 92.2 mg 5,8-bis(5-bromothiophene-2-yl)-2,3-bis(4-octyloxyphenyl)quinoxaline, 900 mg 4,4-bis(2-ethylhexyl)-2,6-bis(trimethylstannyl)-4H-cyclopenta(2,1-b:3,4-b')benzothiadiazole and 30 mg tetrakis(triphenylphosphine)palladium(0) dissolved in 6 ml p-xylene were reacted at 120 degrees C for 5 minutes, 140 degrees C for 5 minutes and 170 degrees C for 40 minutes to obtain poly(2,6-(4,4-bis(2-ethylhexyl)-4H-cyclopenta(2,1-b;3,4-b)dithiophene)-alt-4,7-(2,1,3-benzothiadiazol)-co-5,8-bis(thiophen-2-yl)-2,3-bis(4-octyloxyphenyl)quinoxaline (having a number-average molecular weight of 10.1 KDa and a weight-average molecular weight of 11.6 KDa).