A Free‐Standing High‐Output Power Density Thermoelectric Device Based on Structure‐Ordered PEDOT:PSS. (2nd January 2018) - Li, Zaifang
Abstract: 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. Abstract : A free‐standing thermoelectric (TE) device is realized based on a high conductivity (2500 S cm −1 ) structure‐ordered poly(3, 4‐ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) film with output power density of 99 ± 18.7 µW cm −2 under a gradient of 29 K, which is the highest value for pure PEDOT:PSS‐based TE device. Free‐standing TE device presented here suggests its great potential application in low‐consumption wearable electronics.