NOVELTY - Conjugated polymer comprising at least one identical or different repeating unit of substituted phenanthro(1,10,9,8-c,d,e,f,g)carbazole (I), is new.    USE - (I) are useful as charge transport, semiconducting, electrically conducting, photoconducting or light emitting material in optical, electrooptical, electronic, electroluminescent or photoluminescent components or devices including organic field effect transistors (OFET), 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 devices (OPV), 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 light emitting diodes, Schottky diodes, planarizing layers, antistatic films, polymer electrolyte membranes, conducting substrates, conducting patterns, electrode materials in batteries, alignment layers, biosensors, biochips, security markings, security devices or components or devices for detecting and discriminating DNA sequences, preferably OFET device or a bulk heterojunction OPV device (all claimed).    ADVANTAGE - The polymers: are easy to synthesize; and exhibit low bandgap, high charge carrier mobility, high solubility in organic solvents, good processability for the device manufacture process, high oxidative stability and a long lifetime in electronic devices.    DETAILED DESCRIPTION - Conjugated polymer comprising at least one identical or different repeating unit of substituted phenanthro(1,10,9,8-c,d,e,f,g)carbazole of formula (I), is new.    R = 2-40C aryl, heteroaryl, aryloxy or heteroaryloxy (all optionally substituted by at least one R1), 1-35C alkyl (optionally branched or cyclic in which at least one non-adjacent C atom is optionally replaced by -O- -S-, -CO-, -CO-O-, -O-CO-O-, -CR2=CR3- or -C=C-, and at least one H atom is optionally replaced by F, Cl, Br, I or CN), H or halo, where the benzene rings are optionally substituted with at least one R;    R1 = 1-40C carbyl or hydrocarbyl (both optionally substituted and comprising at least one hetero atom), silyl (optionally substituted), H, halo, -CN, -NC, -NCO, -NCS, -OCN, -SCN, -C(=O)NR2R3, -C(=O)X1, -C(=O)R2, -NH2, -NR2R3, -SH, -SR2, -SO3H, -SO2R21, -OH, -NO2, -CF3, -SF5 or P1-Sp-;    R2, R3 = carbyl or hydrocarbyl (both optionally substituted and comprising at least one hetero atom) or H;    Ar1 = aryl or heteroaryl (both optionally substituted), -CY1=CY2- or -CC-;    Y1, Y2 = H, F, Cl or CN;    P1 = polymerizable group;    Sp = spacer group or single bond;    X1 = halo; and    m = 0-3.    INDEPENDENT CLAIMS are also included for:    (1) substituted phenanthro(1,10,9,8-c,d,e,f,g)carbazole monomer of formula (II);    (2) mixture or blend comprising (I) and at least one compound or polymer having semiconducting, charge transport, hole/electron transport, hole/electron blocking, electrically conducting, photoconducting or light emitting properties; and    (3) formulation comprising (I) and at least one solvent, preferably organic solvent.    R4, R5 = R1, -CH2Cl, -CHO, -CH=CH2, -SiRaRbRc, -SnRaRbRc, -BRaRb, -B(ORa)(ORb), -B(OH)2 or P1-Sp; either    Ra, Rb = R2; or    Ra and Rb = form a ring together with the hetero atom to which they are attached; and    Rc = R2.