Controlling n-Type Molecular Doping <i>via</i> Regiochemistry and Polarity of Pendant Groups on Low Band Gap Donor–Acceptor Copolymers
Gang Ye, Jian Liu, Xinkai Qiu, Sebastian Stäter, Li Qiu, Yuru Liu, Xuwen Yang, Richard Hildner, L. Jan Anton Koster, Ryan C. Chiechi
Abstract
in the doped copolymer with the polar pendant groups on both the D and A moieties. We used spatially resolved absorption spectroscopy to relate commensurate morphological changes to the dispersion of dopants and to the relative local doping efficiency, demonstrating a direct relationship between the morphology of the polymer phase, the solvation of the molecular dopant, and the electrical properties of doped films. Our work offers fundamental new insights into the influence of the physical properties of pendant chains on the molecular doping process, which should be generalizable to any molecularly doped polymer films.