Conjugated polymers have a combination of a metallic property (conductivity) and polymeric properties; doping makes the conjugated polymer semiconducting ranging from insulating to low conducting. The doping process is a tested effective method to produce conducting polymers as semiconducting material and provides a substitute for inorganic semiconductors. The recent and rapid growth of interest in conjugated polymer-dopant interaction has been stimulated by a cross-disciplinary group of investigators: chemists, electrochemists, biochemists, experimental and theoretical physicists, electronic and electrical engineers. Doping in Conjugated Polymers is the first book to be dedicated to the subject and offers an A to Z overview. It details doping interaction, dopant types, doping techniques, influence of dopant on applications etc. It explains how the performances of doped conjugated polymers are greatly influenced by the nature of dopants and their level of distribution within the polymer, and shows how the electrochemical, mechanical, and optical properties of the doped conjugated polymers can be tailored by controlling the size and mobility of the dopants counter ions. The book also examines doping at the nano scale in particular with carbon nanotubes.