High ambipolar and balanced carrier mobility in regioregular poly(3-hexylthiophene)

The carrier transport of carefully purified regioregular poly(3-hexylthiophene) films has been studied using time-of-flight photocurrent measurements. We find balanced ambipolar transport with a room-temperature mobility for holes of $3×10−4cm2V−1s−1$ and for electrons of $1.5×10−4cm2V−1s−1$ at electric fields $⩾105V∕cm$⁠. The transport is relatively field independent and weakly temperature dependent, pointing to a high degree of chemical regioregularity and purity. These factors make poly(3-hexylthiophene) attractive for use in a range of electronic applications.