A free-standing high-output power density polymeric thermoelectric (TE) device is realized based on a highly conductive (≈2500 S cm−1) structure-ordered poly(3,4-ethylenedioxythiophene):polystyrene sulfonate film (denoted as FS-PEDOT:PSS) with a Seebeck coefficient of 20.6 µV K−1, an in-plane thermal conductivity of 0.64 W m−1 K−1, and a peak power factor of 107 µW K−2 m−1 at room temperature. Under a small temperature gradient of 29 K, the TE device demonstrates a maximum output power density of 99 ± 18.7 µW cm−2, which is the highest value achieved in pristine PEDOT:PSS based TE devices. In addition, a fivefold output power is demonstrated by series connecting five devices into a flexible thermoelectric module. The simplicity of assembling the films into flexible thermoelectric modules, the low out-of-plane thermal conductivity of 0.27 W m−1 K−1, and free-standing feature indicates the potential to integrate the FS-PEDOT:PSS TE modules with textiles to power wearable electronics by harvesting human body's heat. In addition to the high power factor, the high thermal stability of the FS-PEDOT:PSS films up to 250 °C is confirmed by in situ temperature-dependent X-ray diffraction and grazing incident wide angle X-ray scattering, which makes the FS-PEDOT:PSS films promising candidates for thermoelectric applications.
|Journal||Advanced Electronic Materials|
|State||Published - Feb 2018|
Bibliographical noteFunding Information:
Z.F.L. and H.D.S. contributed equally to this work. The work was supported by the Vinnova Marie Curie incoming project [2016-04112 to Z.F.L.], the Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linköping University [200900971 to F.Z.], the Recruitment Program of Global Youth Experts [2014 to Y.H.Z.], the National Natural Science Foundation of China [21474035 to Y.H.Z.], the United States National Science Foundation [DMR-1262261 to J.B.], the Open Fund of the State Key Laboratory of Luminescent Materials and Devices [2016-skllmd-03 to Y.H.Z.], the European Research Council [ERC 307596 to X.C.]. The authors are grateful to Prof. Wei Xu at the Chinese Academy of Sciences for preliminary characterization of the film and discussion. Y.Q.X. and X.J.L. acknowledge the beam time and technical supports provided by 23A SWAXS beamline at NSRRC, Hsinchu. The authors thank Ruoyun Zhang, a visiting undergraduate student from Tsinghua University, China, for helping with module template preparation.
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
- free-standing PEDOT:PSS film
- output power density
- thermoelectric generators
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials