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 3Ã10−4 cm2 V−1 s−1 and for electrons of 1.5Ã10−4 cm2 V−1 s−1 at electric fields ù105 V/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. © 2004 American Institute of Physics. [DOI: 10.1063/1.1805175]