High Conductivity in a Nonplanar n-Doped Ambipolar Semiconducting Polymer

Perry, E. E., Chiu, C. Y., Moudgil, K., Schlitz, R. A., Takacs, C. J., O’Hara, K. A., Labram, J. G., Glaudell, A. M., Sherman, J. B., Barlow, S., Hawker, C. J., Marder, S. R., Chabinyc, M. L.
Chem. Mater.
29 (22), pp 9742–9750

n-Doping of P(BTP-DPP) with the organometallic dimer (RuCp*mes)2, processed through sequential casting, is reported. Maximum conductivities of 0.45 S cm–1 were achieved that are relatively high for n-type semiconducting polymers. Electron paramagnetic resonance spectroscopy, ultraviolet visible spectroscopy, and ultraviolet photoemission spectroscopy are consistent with the introduction of high carrier concentrations by sequential processing, leading to bipolaronic, or otherwise spin-paired carriers. P(BTP-DPP) has glassy ordering in thin films, observed using wide angle X-ray scattering, that allows efficient incorporation of the dopant as a function of processing condition. The changes in electrical conductivity as a function of the dopant concentration are proposed to occur by charge percolation through domains with a mixture of polaronic and bipolaronic carriers.