| 초록 |
With the aim of enhancing the field-effect mobility and air stability of self-aligned poly(3-hexylthiophene), P3HT, by promoting two-dimensional molecular ordering, we transformed theP3HT chain from a benzoid to a quinoid by doping the P3HT solution with HAuCl4 prior to film formation. We found that for the appropriate HAuCl4 concentration, the P3HT nanocrystals adopt a highly ordered molecular structure with a field-effect mobility of 0.03 cm2V-1s-1, which is an improvement by a factor of more than 100. This resulted from the change in the P3HT chain conformation from a benzoid to a quinoid structure due to oxidation by HAuCl4. The quinoid structure favors a linear or expanded-coil conformation, so the thiophene inter-ring bonds have increased double bond character, which improves the molecular ordering. Furthermore, the electrical properties of a doped P3HT device had highly improved stability to air without encapsulation. |
