We demonstrate an improved thermoelectric performance of small molecular thin films fabricated by thermal deposition of pentacene as a p -type conduction layer. To enhance the performance, a bilayer structure composed of an intrinsic pentacene layer and an acceptor 2,3,5,6-tetrafluoro-7,7,8,8- tetracyanoquinodimethane layer is utilized as the prototype thermoelectric element. With the bilayer structure, the electrical conductivity reaches 0.43 S/cm, exhibiting a positive Seebeck coefficient of about 200 μV/K. We thus obtain a high power factor of 2.0 μW/ mK2 with an optimized layer thickness.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)