NOVELTY - A conjugated polymer comprising 1 or more triaza-s-indacene dione unit (I), optionally 1 or more units (D) having electron donor properties, 1 or more units (A) having electron acceptor properties, and 1 or more spacer units which are provided between each of triaza-s-indacene dione units, is new. The unit (D) and unit (A) are directly connected to each other in the polymer chain. The unit (D), unit (A) and spacer units are different from triaza-s-indacene dione unit.    USE - New conjugated polymer is used in formulation for forming charge injection layer, charge transport layer, interlayer, planarizing layer, antistatic film, polymer electrolyte membrane, conducting substrate and conducting pattern for semiconductor, charge transporting material, electroconductive device, photoconducting device, light-emitting material, optical device, electro-optical device, electronic device, electroluminescent device, photoluminescent device e.g. organic-field effect transistor, organic thin-film transistor, organic light-emitting diode, organic light-emitting transistor, organic photovoltaic device, organic photodetector, organic solar cell, laser diode, Schottky diode and photoconductor, and assembly e.g. integrated circuit, radio frequency identification tag, security marking, security device, flat panel display, backlight, electrophotographic device, electrophotographic recording device, organic memory device, sensor device, biosensor and biochip, and bulk heterojunction for bulk heterojunction for organic photovoltaic device and inverted organic photovoltaic device (all claimed).    ADVANTAGE - The conjugated polymer has high solubility with respect to organic solvent, reduced energy loss during electron transfer process. The electronic device formed using the conjugated polymer has high charge carrier mobility, high external quantum efficiency, high oxidative stability, high power conversion efficiency, excellent durability, and low bandgap.    DETAILED DESCRIPTION - A conjugated polymer comprising 1 or more triaza-s-indacene dione units of formula (I), optionally 1 or more units (D) having electron donor properties, 1 or more units (A) having electron acceptor properties, and 1 or more spacer units which are provided between each of triaza-s-indacene dione units, is new. The unit (D) and unit (A) are directly connected to each other in the polymer chain. The unit (D), unit (A) and spacer units are different from triaza-s-indacene dione unit, and are chosen from optionally substituted arylene and heteroarylene groups. The polymer is a random copolymer formed by copolymerizing 3 or more monomers comprising units chosen from triaza-s-indacene dione unit and spacer unit, and optionally unit (D) and acceptor (A).    X=S, Se, O or NR;    R=H, or linear, branched or cyclic 1-30C alkyl (optionally substituted by F, Cl, Br, I or CN) in which 1 or more CH2 groups are optionally substituted by -O-, -S-, -C(=O)-, -C(=S)-, -C(=O)-O-, -O-C(=O)-, -NR0-, -SiR0R00-, -CF2-, -CHR0=CR00-, -CY1=CY2- or -CC- where O and S atoms are not linked directly, or monocyclic or polycyclic 5-15C aryl or 5-15C heteroaryl (optionally substituted by halo or alkyl or cycloalkyl);    Y1,Y2=H, F, Cl or CN;and    R0,R00=H, or 1-40C carbyl or hydrocarbyl, preferably 1-12C alkyl.    INDEPENDENT CLAIMS are included for the following:    (1) mixture or polymer blend, which consists of 1 or more polymers, 1 or more compounds having semiconducting, charge transport, hole transport, electron transport, hole blocking, electron blocking, electroconducting, photoconducting and light-emitting properties;    (2) formulation, which consists of 1 or more polymers, polymer blend or mixtures and organic solvent; and    (3) use of polymer, polymer blend or mixture.