Fig. 2. Measured thermal conductivity using TDTR.

Temperature-dependent thermal conductivity of P3HT films grown on glass substrates. The green spheres were measured from a 45°C-grown P3HT film and show a thermal conductivity as high as 2.2 W/m·K. The averages of 20 transient thermoreflectance measurements at 9-, 6-, and 3-MHz modulation frequencies are plotted. The error bars mark 2 SDs (95% confidence interval). All the samples measured were intrinsic P3HT (de-doped), rather than P3HT/FeCl₃ (doped).