Fig. 4: Mechanism for the observed negative ALNE in doped polymers.
From: Observation of anomalously large Nernst effects in conducting polymers
a Schematic of typical doping level and Fermi energy dependence of charge mobility in conducting polymers from intrinsic (undoped) to the highest doping level (half-filling) state. The shaded area represents the regime for negative Nernst coefficients \(\nu\). The down and up arrows indicate the decrease of positive and the increase of negative \(\nu\) magnitude. The \(\nu\) sign transition point is indicated by the dashed black line. b Schematic of the doping level dependence of the Nernst coefficients in conducting polymers corresponding to (a). c Illustration of the difference in Fermi surfaces and scattering physics for 1D polymer chain (up) and 2D/3D FLs (down). d Schematic of diverse and strongly energetic dependent quasiparticle scattering nature in inherently disordered polymers with high doping level.
