Optimization of Ag2 Te/PEDOT∶PSS thermoelectric films by Ag/S double doping
In this paper,(Ag2+yS)x@Ag2 Te/PEDOT∶PSS was synthesized by a wet chemical method,and transformed into films by the vacuum filtration method.The results demonstrated that the absolute Seebeck coefficient of(Ag2 S)0.2@Ag2 Te/PEDOT∶PSScomposite films reaches a maximum value of-91.13 μV/K when x =0.2(y =0.0)at 20 MPa cold pressing,but its electric conductivity is only 7.86 S/cm.The Ag doping content was changed to further improve the conductivity of the composite film.Compared with that of the y =0.0 sample,the electric conductivity of the y =0.2 sample increases 127%up to 17.89 S/cm,and the absolute Seebeck coefficient just slightly decreases.Due to the large increase in electric conductivity,the power factor reaches a maximum of 11.13 μW/mK when y =0.2,which is 1.7 times higher than that of the y = 0.0 sample.This study will provide a useful reference for improving the power factor of silver telluride based thermoelectric thin films.
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