| 초록 |
It is demonstrated that the spatial distribution of dopant molecules within highly-doped conducting polymer films affects thermoelectric (TE) properties of the films. Poly (2,5-bis (3-hexadecylthiophen-2-yl) thieno [3,2-b] thiophene) (PBTTT-C14) films were p-doped by 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ) using different doping methods. F4TCNQ molecules were distributed in the amorphous or crystalline domains, or both, of the PBTTT-C14 film depending on the doping method. When the F4TCNQ molecules were located in the crystalline domain the TE power factor increased rapidly following the relation σS2 ∝ σ0.8, where σ is the electrical conductivity and S is the Seebeck coefficient. These results emphasize the importance of controlling the spatial distribution of dopants within organic materials to achieve high TE performance. |
