NOVELTY - Conjugated polymer comprising one or more bis(thienocyclopenta)benzothiadiazole repeating units (I), is new.    USE - The monomer, polymer, polymer blend or formulation is useful as charge transport, semiconducting, electrically conducting, photoconducting or light emitting material in optical, electro optical, electronic, electroluminescent or photoluminescent components or devices, which are: organic field effect transistors, thin film transistors, integrated circuits, logic circuits, capacitors, radio frequency identification tags, devices or components, organic light emitting diodes, organic light emitting transistors, flat panel displays, backlights of displays, organic photovoltaic (OPV) devices, solar cells, laser diodes, photoconductors, photodetectors, electrophotographic devices, electrophotographic recording devices, organic memory devices, sensor devices, charge injection layers, charge transport layers or interlayers in polymer LEDs, schottky diodes, planarising layers, antistatic films, polymer electrolyte membranes, conducting substrates, conducting patterns, electrode materials in batteries, alignment layers, biosensors, biochips, security markings, security devices, and components or devices for detecting and discriminating DNA sequences; and a bulk heterojunction OPV device (all claimed).    ADVANTAGE - The polymers are easy to synthesize and exhibit a low band gap, high charge carrier mobility, a high solubility in organic solvents, a good processability for the device manufacture process, a high oxidative stability and a long lifetime in electronic devices.    DETAILED DESCRIPTION - Conjugated polymer comprising one or more bis(thienocyclopenta)benzothiadiazole repeating units of formula (I), is new.    X1, X2 = S, Se or CR1=CR2-;    R1-R4 = H, halo, -CN, -NC, -NCO, -NCS, -OCN, -SCN, -C(=O)NR0R00, -C(=O)X0, -C(=O)R0, -NH2, -NR0R00, -SH, -SR0, -SO3H, -SO2R0, -OH, -NO2, -CF3, -SF5, P1-Sp-, optionally substituted silyl, or 1-40C carbyl or hydrocarbyl (optionally substituted and comprises hetero atoms);    P1 = polymerizable group;    Sp = spacer group or single bond;    X = halo;    R0, R00 = H or optionally substituted carbyl or hydrocarbyl group optionally comprising hetero atoms;    Ar1 = optionally substituted aryl or heterorayl, -CY1=CY2- or -C=C-, preferably 2,1,3-benzothiadiazole-4,7-diyl, 2,1,3- benzoselenadiazole-4,7-diyl, 2,3-dicyano-1,4-phenylene, 2,5-dicyano,1,4-phenylene, 2,3-difluro-1,4-phenylene, 2,5-difluoro,1,4-phenylene, 2,3,5,6-tetrafluoro,1,4-phenylene, 3,4-difluorothiophene-2,5-diyl, thieno(3,4-b)pyrazine-2,5-diyl, quinoxaline-5,8-diyl, selenophene-2,5-diyl, thiophene-2,5-diyl, thieno(3,2-b)thiophene-2,5-diyl, thieno(2,3-b)thiophene-2,5-diyl, selenopheno(3,2-b)selenophene-2,5-diyl, selenopheno(2,3-b)selenophene-2,5-diyl, selenopheno(3,2-b)thiophene-2,5-diyl, selenopheno(2,3-b)thiophene-2,5-diyl, 1,4-phenylene, pyridine-2,5-diyl, pyrimidine-2,5-diyl, p-p1-biphenyl, naphthalene-2,6-diyl, benzo(1,2-b:4,5-b')dithiophene-2,6-diyl, 2,2-dithiophene, 2,2-diselenophene, thiazole or oxazole (all of which are unsubstituted, mono- or polysubstituted with R1);    Y1, Y2 = H, F, Cl or CN; and    m = 0-4.    INDEPENDENT CLAIMS are included for:    (1) a 6,7-dihydro-2-thia-1,3-diaza-trindene monomer compound of formula (II);    (2) a polymer blend comprising one or more polymers and one or more polymers, preferably the polymers having semiconducting, charge transport, hole/electron transport, hole/electron blocking, electrically conducting, photoconducting or light emitting properties;    (3) formulation comprising one or more monomers, polymers or the polymer blends and solvents, preferably organic solvents;    (4) optical, electro optical or electronic component or device comprising one or more monomers, polymers, polymer blends or the formulations; and    (5) the preparation of the polymer.    R7, R8 = halo, -CH2Cl, -CHO, -CH=CH2, -SiR1aR1bR1c, -SnR1aR1bR1c, -BR1aR1b, B(OR1a)(OR1b), -B(OH)2, leaving group or P1-Sp; and either    R1a, R1b, R1c = R0 or denote halo; or    R1aR1b = form a ring together with the hetero atom to which the are attached.