NOVELTY - A conjugated polymer (P1) comprising at least one repeating unit selected from phenanthrene unit (I) and/or dihydroindeno(1,2-b)fluorene unit (II), is new.    USE - The polymers are useful as materials selected from semiconducting, charge transport, hole/electron transport, hole/electron blocking, electrically conducting, or photoconducting materials in optical, electrooptical, electronic, electroluminescent, photoluminescent, or light emitting components or devices selected from: organic field effect transistors (OFET), thin film transistors (TFT), integrated circuits (IC), logic circuits, capacitors, radio frequency identification (RFID) tags, devices or components, organic light emitting diodes (OLED), organic light emitting transistors (OLET), 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 light emitting diodes (PLEDs), Schottky diodes, planarizing layers, antistatic films, polymer electrolyte membranes (PEM), 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 (all claimed).    ADVANTAGE - The polymers provide improved p-type organic semiconductors (OSCs) which have a high charge carrier mobility, have a high solubility in organic solvents, a good processability for the device manufacture, high oxidative stability, and/or long lifetime in electronic devices, and are easy to synthesize. The polymers, when used as p-type semiconductors in OFETs, give better performance, in particular higher charge carrier mobility, than analogous polymers containing amine groups.    DETAILED DESCRIPTION - A conjugated polymer (P1) comprising at least one repeating unit selected from phenanthrene unit of formula (I) and/or dihydroindeno(1,2-b)fluorene unit of formula (II), is new.    R1=H, 1-40C straight-chain, branched or cyclic alkyl (optionally substituted by R, and at least one C atom optionally replaced by O, S, CO, CO-O, O-CO, O-CO-O, CR=CR or C?=C such that O- and/or S-atoms are not linked directly to each other, and preferably heteroatoms are not bonded directly to the phenanthrene unit in formula (I), and in which at least one H atom is optionally replaced by halo or CN);    R1-R3=T;    T=2-40C (hetero)aryl (optionally substituted by at least one R);or    two R1 together=mono- or polycyclic aliphatic group;    X and Y1=RC=CR, -C?=C-, or divalent 2-40C (hetero)aryl (optionally substituted by at least one R1);    R=1-22C straight-chain, branched or cyclic alkyl or alkoxy (at least one C atom in both optionally replaced by O, S, CO, CO-O, O-CO, O-CO-O, R'aC=CR'a, or -C?=C-, such that O and/or S atoms are not linked directly to each other, and at least one H optionally replaced by halo or CN), or H, halo, CN, Sn(R'a)3, Si(R'a)3, or -B(R'a)2, or 5-40C (hetero)aryl, or 5-40C (hetero)aryloxy (both optionally substituted by at least one non-aromatic group R'a);or    at least two R together=ring system;    R'a=H or aliphatic or aromatic 1-20C hydrocarbyl;or    two R'a together with hetero atom to which they are attached=ring;    a and b=0-2.    The polymer does not contain a diarylamine or triarylamine group. INDEPENDENT CLAIMS are included for the following:    (1) a formulation comprising at least one monomer, polymer (P1) or polymer blend and at least one solvent, preferably selected from organic solvents; and    (2) preparation of the polymer (P1).