| 초록 |
In this work, we demonstrated that the spatial distribution of molecular dopants 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). Different doping methods distributed dopants in amorphous or crystalline domains, or both, of the PBTTT-C14 film. F4TCNQ molecules in the crystalline domain induced a rapid increase in the thermoelectric power factor of σS2 ∝ σ0.76 where σ is the electrical conductivity and S is the Seebeck coefficient. We believe that such systematic studies on the structural relation between dopants and conducting polymer chains in highly doped conducting polymers will provide guidelines for designing high-performance organic TE materials. |
