Consider high molecular weight regioregular poly(3-hexylthiophene) (P3HT). Describe the chemistry and physics of P3HT doping with sodium naphthalenide. Clearly show the reactions and structures involved, experimental conditions, and the dopant and counterion species. Show the changes produced in the band structure of P3HT upon doping. Finally, demonstrate the concept of compensation for the above doped P3HT.