NOVELTY - ABA triblock copolymer (I) is new, where the B block is an oligomer or polymer of heteroaromatic monomers, the A block is an end-cap that is non-conjugated and non-electrically conducting, and the end-cap contains at least one branch, where the end cap A block comprises: a heteroaromatic ring, and a branched, non-conjugated, non-electrically conductive group attached to the heteroaromatic ring at a position adjacent the heteroatom in the heteroaromatic ring, and where the branched group is ester compounds, alcohol compounds and their salts.    USE - (I) are useful in field effect transistors and solar cells.    ADVANTAGE - (I) exhibits improved processability, optical properties, and physical properties (improved optical transparency, reduced surface resistance and reduced surface roughness).    DETAILED DESCRIPTION - ABA triblock copolymer (I) is new, where the B block is an oligomer or polymer of heteroaromatic monomers, the A block is an end-cap that is non-conjugated and non-electrically conducting, and the end-cap contains at least one branch, where the end cap A block comprises: a heteroaromatic ring, and a branched, non-conjugated, non-electrically conductive group attached to the heteroaromatic ring at a position adjacent the heteroatom in the heteroaromatic ring, and where the branched group is ester compounds of formulae (-C(R5)2-CH(-O-C(=O)-R21)-L-CH2-O-C(=O)-R22) (a), (-C(R5)2-CH(-O-C(=O)-R21)-L-O-C(=O)-R22) (b) and (-C(R5)2-CH(-O-C(=O)-CH(R21)-R22)-L-O-C(=O)-CH(R31)-R32) (c), alcohol compounds of formulae (-C(R5)2-CH(-O-CH2-CHOH-R21)-L-O-L1-CH(OH)-R22) (d), (-C(R5)2-CH(-O-CH2-CHOH-R21)-L-O-L1-CH(OR23)-R22) (e), (-C(R5)2-CH(-O-CH2-CH(OR24)-R21)-L-O-L1-CH(OH)-R22) (f), (-C(R5)2-CH(-O-CH2-CH(OR24)-R22)-L-O-L1-CH(OR23)-R21) (g), and (-C(R5)2-CH(-O-CH2-CH(OR21)-O-CH2-CH(OR41)-R42)-L-O-L1-CH(R22)-O-CH2-CH(OR43)-R44) (h) and their salts.    R21-R24, R31, R32, R41-R44 = H, deuterium, alkyl, alkenyl, alkoxy, aryl, phenyl, carboxylate, alkylcarbonyl, akanoyl, alkylthio, cycloalkyl, cycloalkoxy, alkyloxy, alkenyloxy, alkenyldioxy, aryl, alkylaryl, arylalkyl, aryloxy, amino, alkylamino, dialkylamino, alkylcarbonylamino, alkylsulfinyl, aryloxyalkyl, alkoxylalkyl, polyetheralkyl, phosphate, phosphite, phosphine, OH, CN, sulfonate, alkylsulfonate, arylsulfonate, alkylsulfate, arylsulfate, nitroalkyl, alkylsilane, arylsilane, an oligomeric chain (which is made by repeating monomers from glycols, ethers, fluoroethers, olefins, fluoroolefins, acrylates or methacrylates), vinyl groups, alkynes, esters, amino acids, lactones or lactams, urethanes, epoxies, hydroxyacids, dienes, chloroolefins, diols, diamines, polyamines, groups containing acrylates or methacrylates, groups containing esters, ethers, hydroxyls, epoxies or amines, epoxidized groups, ring-opened epoxy groups, polyglycols, polyethylene glycol, polyethers, poly(fluoroethers), polyacetals, polyolefins, polyenes, polystyrene and its copolymers, polyfluoroolefins, polyols, polyoxides, polychloroolefins, polychlorofluoroolefins, polysiloxanes, polyesters, polybromoesters, natural and synthetic rubbers, polyacids, polycarbonates, polyanhydrides, polysulfides, polyamides, polyamines, polyimides, vinyl polymers, polymers derived from the polymerization of unsaturated monomers, polyacrylates, polymethacrylates, polyacrylonitrile and its copolymers, polybutadiene and its copolymers, alkyds, polyalcohols, polyurethanes, epoxies, cellulose and its derivatives, starch and its derivatives, polypeptides, oligonucleotides, nucleotides, oligosaccharides, polysaccharides and/or their copolymers;    R5 = H, alkyl (optionally substituted), halo or all non-hydrogen functional groups that are stable to oxidative polymerization reaction conditions and which do not disrupt the oxidative polymerization reaction; and    L, L1 = single bond, and a linker between the indicated moieties of alkylene, methylene, linear alkylene, cyclic alkylene groups, alkenylene, arylene groups, ether, polyether, thioether or polythioether groups (all optionally substituted), where any substituents on the linker groups are not reactive under oxidative polymerization reaction conditions.    INDEPENDENT CLAIMS are included for:    (1) an electrically conducting thin film comprising an intrinsically conducting ABA triblock copolymer; and    (2) an intrinsically conducting polymer or an intrinsically conducting oligomer that is terminated with one or more end-capping groups, where an end-capping group comprises a heteroaromatic ring that is substituted with a branched, non-conjugated, non-electrically conductive group on the heteroaromatic ring at a position adjacent the heteroatom and where the end-capping group is a hyperbranched group having three to five branch points which are linked by linear or branched alkyl esters, the products of the ring opening of epoxy compounds, and alkyl terminated polyethylene glycol oligomers.