SignificantlyEnhanced Thermoelectric Properties ofOrganic–Inorganic Hybrids with a Periodically Ordered Structure
2020
The
deficient order in amorphous components severely affects the
thermoelectric (TE) properties in polymers. Encouragingly, two-dimensional
layered double hydroxides (LDHs) have been regarded as an efficient
host material to tune the conformation of guest molecules and construct
ordered hybrids. Herein, we report a facile construction of periodically
ordered organic–inorganic TE hybrids by alternative stacking
of inorganic LDH nanosheets and organic poly(3,4-ethylenedioxythiophene)-poly(styrene
sulfonate) (PEDOT:PSS) molecules. The ordered structure of PEDOT:PSS–LDH
gave rise to the extended molecular configuration of PEDOT:PSS, resulting
in the improved carrier mobility in the hybrids. Moreover, the energy
filtering was induced by such a periodically ordered structure, which
blocked the low-energy carriers preferentially and improved the Seebeck
coefficient in the hybrids. Therefore, the power factor of the PEDOT:PSS–LDH
hybrid was 120-fold higher than that of pristine PEDOT:PSS. These
results not only establish an effective method for the construction
of periodically ordered TE materials but also address the significance
of an ordered structure of molecules in TE materials.
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