posted on 2021-04-22, 20:44authored byShawn
A. Gregory, James F. Ponder, Sandra L. Pittelli, Mark D. Losego, John R. Reynolds, Shannon K. Yee
This
study reports the electronic properties of a family of 3,6-dioxythienothiophene
copolymer thin films (referred to as DOTTs) as a function of F4TCNQ
doping level. We find that DOTTs have unusually low Seebeck coefficients
and that the dependence on carrier concentration could not be accurately
explained with present transport models. Furthermore, electrical conductivities
were measured as a function of temperature, and some polymer/dopant
systems demonstrated unusually low activation energies. The Mott polaron
model transport parameters were further evaluated to quantify the
effects of carrier concentration. Overall, this work discusses the
electronic properties of DOTTs and provides guidance for designing
polymer chemistries.