TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): Preparing (I) comprises coupling at least one monomers (III) optionally with at least one monomers based on a unit (II), and optionally with further units, in a polymerization reaction. Preferred Process: The cleaving step is achieved by heating above 250 degrees C. The process comprises heating a thin film of (I). Preferred Components: (I) is: of formula (Ia)-(Ic); a random terpolymer comprising two structurally distinct repeating units (II) and a repeating unit of hydrocarbyl (III), or a repeating unit (II) and two structurally distinct repeating units (III); a terpolymer comprising the repeat units of formula (IVa) or (IVb); a copolymer, which is a statistical copolymer, an alternating copolymer or a block copolymer; and a homopolymer.R4 = H or alkyl;M3 = structurally distinct third monomer unit (II) or (III); andm, 1-m = molar proportions of the repeating units. Preferred Definitions:    x, n = 1;    y, w = 0 or 1;    Ar1-Ar3 = thiophene;    Ar4 = substituted quinoxaline moiety of formula (a1), substituted pyrido(3,4-b)pyrazine moiety of formula (a2), substituted (1,2,5)thiadiazolo(3,4-c)pyridine moiety of formula (a3), substituted benzo(1,2,5)oxadiazole moiety of formula (a4), substituted 2-thia-1,3,5,8-tetraaza-cyclopenta(b)naphthalene moiety of formula (a5), substituted thieno(3,4-b)pyrazine moiety of formula (a6), substituted benzo(1,2,5)thiadiazole moiety of formula (a7), substituted (1,2,5)oxadiazolo(3,4-c)pyridine moiety of formula (a8), substituted bicyclyl moiety of formula (a9), substituted 2,5-dihydro-cyclopenta(c)pyrrole-1,4-dione moiety of formula (a10), substituted benzo(lmn)(3,8)phenanthroline-1,3,6,8-tetraone moiety of formula (a11), substituted benzo(de)isoquinoline-1,3-dione moiety of formula (a12), substituted 16-azahexacyclo(12.6.2.1(2,6).0(11,21).0(18,22).0(10,23))tricosa-1(21),2,4,6(23),7,9,11,13,18(22),19-decaene-15,17-dione moiety of formula (a13), substituted anthra(2,1,9-def;6,5,10-d'e'f')diisoquinoline-1,3,8,10-tetraone moiety of formula (a14), substituted 1,2,4,5-tetrafluoro-benzen-3,6-diyl moiety of formula (a15), substituted benzene moiety of formula (a16), substituted thieno(3,4-c)pyrrole-4,6-dione moiety of formula (a17), substituted 2H-benzotriazole moiety of formula (a18), substituted thiophene moiety of formula (a19), substituted 4,7-di-thiophen-2-yl-benzo(1,2,5)thiadiazole moiety of formula (a20), substituted (2,2')bithiophenyl moiety of formula (a21) or substituted thieno(3,2-b)thiophene moiety of formula (a22);    R5 = 1-40C carbyl, 1-40C hydrocarbyl (both optionally substituted and optionally comprises at least one heteroatom), silyl (optionally substituted), H, halo, aryl, heteroaryl, -CN, -NC, -NCO, -NCS, -OCN, -SCN, -C(=O)NR1aR1b, -C(=O)X1, -C(=O)R1a, -C(OR1a)2R1b, -NH2, -NR1aR1b, -SH, -SR1a, -SO3H, -SO2R1a, -OH, -NO2, -CF3 or -SF5;    R6 = H, alkyl, halo, aryl, perfluoroalkyl, thioalkyl, alkoxy, heteroaryl, alkylaryl or arylalkyl;    E1 = N, CH, O, S, P, Si, Se, As, Te, Ge, P=O, PF2, P=S, As, As=O, As=S, Sb, Sb=O or Sb=S; and    Z1 = mononuclear aryl, polynuclear aryl, heteroaryl, fluorenyl, alkenyl or arylalkyl (al optionally substituted) or absent.    EXAMPLE - To an ice-cooled solution of 5-pentadecanoyl-2,3-bis(3-thienyl)thiophene (5.18 g) in anhydrous dichloromethane (500 ml) was added boron trifluoride diethyl etherate (1.70 ml) after which 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (2.90 g) was added portion-wise during 10 minutes. The reaction mixture was allowed to warm to room temperature over night and was subsequently quenched by addition of zinc (7 g) and methanol (250 ml). After stirring over night, the reaction mixture was filtered, washed with water, dried over anhydrous magnesium sulfate and concentrated, and further purified to obtain 2-hexadecanoylbenzo(1,2-b:3,4-b':5,6-d'')trithiophene. Solution of 2-hexadecanoylbenzo(1,2-b:3,4-b':5,6-d'')trithiophene (1.61 g) and N-bromosuccinimide (1.24 g) in anhydrous N,N-dimethylformamide (150 ml) was stirred at 50 degrees C in the dark over night, after which the reaction mixture was quenched with water, extracted with chloroform, washed with aqueous sodium thiosulfate and water and finally dried over anhydrous magnesium sulfate, concentrated and further purified to obtain 5,8-dibromo-2-hexadecanoylbenzo(1,2-b:3,4-b':5,6-d'')trithiophene. Solution of 5,8-dibromo-2-hexadecanoylbenzo(1,2-b:3,4-b':5,6-d'')trithiophene (172.33 mg), 2,1,3-benzothiadiazole-4,7-bis(boronic acid pinacol ester) (104.08 mg) and Aliquat 336 (RTM: N-Methyl-N,N-dioctyloctan-1-ammonium chloride) (1 drop) in toluene (5 ml) was degassed by bubbling with argon for 1 hour whereupon tris(dibenzylideneacetone)dipalladium (5.1 mg), tris(ortho-tolyl)phosphine (6.7 mg) and a degassed aqueous solution of sodium carbonate (1 ml) were added and the reaction mixture was sealed and heated to 120 degrees C for 72 hours. The reaction mixture was poured into hydrochloric acid-acidic methanol and filtered to obtain poly((2-hexadecanoylbenzo(1,2-b:3,4-b':5,6-d'')trithiophene-5,8-diyl)-alt-co-(2,1,3-benzothiadiazole-4,7-diyl)).