| 초록 |
Blending organic semiconductors with dopants is often less efficient than anticipated, probably because small molecular dopants are excluded from the conjugated polymer (CP) matrix during film preparation. When two CPs with long side chains and an electron-donating isoindoloindole derivative are subjected to molecular doping with F4-TCNQ, the sequential doping with F4-TCNQ solution provides strong intercalation between the CPs’ matrix and F4-TCNQ, resulting in higher electrical conductivity, over 140 S·cm−1, with long-term stability and flexibility. Finally, it is confirmed that the sequential doping depends on the diffusion efficiency of the doping solution by comparing the electrical conductivity according to the thermal annealing temperature of the CP film. Our results suggest that CP having a lower glass transition temperature and capable of maintaining low levels of crystallinity is advantageous for sequential doping and ultimately high electrical conductivity. |
