Comparison of the carrier mobilities of annealed P3HT films by using charge carrier extraction by linearly increasing voltage and space-charge limited current

ABSTRACT

Vertical mobilities of poly-3-hexythiophene (P3HT) thin films annealed with various temperatures were estimated by using charge carrier extraction by linearly increasing voltage (CELIV) method, and were compared with those estimated from a conventional space-charge limited current (SCLC) method. Both methods revealed that the mobilities were improved with increasing annealing temperature because of enhanced crystallinity of the P3HT film. In high annealing temperature more than 150°C, SCLC method could not be applicable due to deviation from theoretical analysis; in contrast, CELIV method was valid for all annealing conditions.

KEYWORDS:

• Charge carrier mobility
• poly-3-hexythiophene
• charge carrier extraction by linearly increasing voltage
• space-charge limited current

Acknowledgment

This research was supported by CREST program by Japan Science and Technology Agency (JST) and Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS).