Electrochemical and chemical doping behavior of bithiophene-bithiazole copolymer

An alternating copolymer of 4,4'-dialkyl-2,2'-bithiazole (alkyl = tridecyl) and 2,2'-bithiophene receives electro-chemical p-doping and n-doping with a peak current anode potential (E-pa) and a peak cur-rent cathode potential (E-pc) of 0.69 and -2.13 V vs. Ag+/Ag, respectively. The copolymer undergoes chemical p-doping with NOBF4. X-ray diffraction (XRD) data of the p-doped copolymer indicate that the pi-stacking distance of the copolymer is shortened from 3.62 to 3.52 angstrom after the p-doping. Location of the BF4- dopant in the p-doped copolymer is discussed.