Figure 4. Three dimensional plot of the charge carrier density distribution across the channel of the polymer FET as a function of different applied source-drain voltage V_ds (y-axis).

The charge carrier density ρ_2D (z-axis) is obtained from analysis of the IR-CMS spectra. x_d (x-axis) is the distance from the drain electrode. Measurements were obtained with gate modulation voltages of V_on = −60 V and V_off = 80 V. Note the logarithmic color scale.