Comparison of Hole Hopping Diffusion and Migration in a Triarylamine Containing Polymer

Electron hopping charge transport rates in a triarylamine containing polymer were investigated electrochemically in the presence of a contacting electrolyte and in the solid state (absence of liquid electrolyte). Electron hopping diffusion coefficients were measured by steady state voltammetry in thin polymer films on Au microelectrode interdigitated arrays. In addition, zero-field extrapolated electron hopping mobilities and zero-field mobility activation energies are obtained from time-of-flight (TOF) measurements. Electron hopping diffusion coefficients (Dh, cm2/s) and diffusion activation energies obtained in solid state electrochemical experiments can be correlated with zero-field hole mobilities (cm2/V-s) and activation energies via the Einstein relationship.