TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The conjugated polymer is configured and arranged with the other material at molar ratio and a miscibility that provide a homogeneous distribution of conductivity throughout a structure predominately composed of the conjugated polymer and the other material. The conjugated polymer is configured and arranged with the other material to mitigate changes in conductivity of the conjugated polymer of greater than 5%. The conjugated polymer is configured and arranged with the other material to provide a degree of solubility that is higher than a solubility of the conjugated polymer without attached with the other material, by a factor of at least 50%. The conjugated polymer is configured and arranged with the other material to mitigate changes in conductivity of the conjugated polymer of greater than 5%, and provide a degree of solubility that is higher than a solubility of the conjugated polymer without attached with the other material, by a factor of at least 50%. The degree of solubility of the conjugated polymer that is higher than the solubility of the conjugated polymer is twice the solubility of the conjugated polymer without attached with the other material. The conjugated polymer and the other material are configured as printable material, and further include an optoelectronic structure predominately composed of the conjugated polymer and the other material. The optoelectronic structure forms a component of at least one of: a solar cell collector, a photovoltaic electrode, an organic bulk heterojunction (BHJ) solar cell, a semi-conductive material configured and arranged to form part of a selectively-conductive switch or transistor, a polymer solar cell, and a field effect transistor. The conjugated polymer and the other material are configured and arranged to control a size of the side or end chain based upon a radius of gyration of the conjugated polymer while in solution and in a solid state. The conjugated polymer and the side chain or end chain form a thin film having charge transport characteristics and in which the side chain or end chain makes up to 3-35% of the molar content of the apparatus, for mitigating significant alteration of the charge transport characteristics upon coupling of the side chain or end chain and the conjugated polymer. The conjugated polymer and the side chain or end chain are cooperatively configured and arranged with a viscosity in solution that is less than a viscosity of the conjugated polymer in solution, without the side chain or end chain, for common concentrations. The other material includes both the side chain and the end chain, where the side chain includes a monomer and the end chain includes an end-capping reagent. Preferred Method: The method using the conjugated polymer with the other material at the molar ratio includes providing a miscibility that, with the solubility, provides homogeneous distribution of conductivity throughout a structure predominately composed of the conjugated polymer and the other material. 19. The method of attaching the conjugated polymer to the other material includes attaching polystyrene to the conjugated polymer, where the polystyrene has a low polydispersity index (PDI) and controlled molecular weight, using one of a living radical and anion polymerization.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The conjugated polymer is an isoindigo-based conjugated polymer, preferably a poly(isoindigodithiophene)-based polymer, diketopyrrolopyrrole-based polymer, naphthalene diimide-based polymer or fused thiophene based polymer. The other material is a linear siloxane chain or linear polystyrene end chain. The side chain or end chain includes at least one of an oligomeric substituent, polymeric substituent and polystyrene coupled to the polymer via random copolymerization.