Abstract
Flexible thermoelectrics provide a distinct solution for developing sustainable and portable power supplies.Inorganic/organic material compositing is an effective strategy to induce a significant enhancement of thermoelectric(TE)performance.However,the poor electrical performance of inorganic/organic material is attributed to the poor carrier transport between organic/inorganic interfaces induced by the low contribution of composited inorganic materials.Herein,we prepared a high room temperature figure-of-merit(ZT)value of～0.19 and high bending resistance(surviving 1200 bending cycles at the bending radius of 16.5 mm)of p-type poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate)(PEDOT:PSS)/Bi0.5Sb1.5Te3 free-standing composite film via a facile vacuum-assisted filtration approach.Com-positing Bi0.5Sb1.5Te3 nano-spherical particles into PEDOT:PSS results in the optimized interfacial contact and carrier concentration,leading to a high Seebeck coef-ficient of～43.79 pV·K-1.Accordingly,a high-power factor of～1.52 pW·cm-1·K-2 is achieved in the PED-OT:PSS/Bi0.5Sb1.5Te3 composite film at room temperature.In addition,the PEDOT:PSS/Bi0.5Sb1.5Te3 interfaces with phase boundaries,nanograins and point defects could fur-ther decrease the thermal conductivity to～0.20 W·m-1·K-1,leading to a high ZT value.Furthermore,a 6-leg free-standing film device was assembled,which provided an output power of 44.94 nW.This study demonstrates that free-standing organic/inorganic composite films are effec-tive power sources for wearable electronic products.
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