Charge carrier dynamics in bulk poly(3-hexylthiophene) as a function of temperature

The charge carrier mobility in bulk samples of regioregular poly-3-hexylthiophene is determined from -100 to +140°C with the pulse-radiolysis time-resolved microwave conductivity technique. The lower limit to the mobility obtained increases only slightly with temperature in this range from 0.003 cm 2 /Vs to 0.01 cm 2 /Vs. However, the decay kinetics of the charge carriers is strongly dependent on temperature. This is attributed to changes in the effective domain size in which the charge carriers are able to move.