Sulfuric acid vapor treatment for enhancing the thermoelectric properties of PEDOT:PSS thin-films
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We introduce a sulfuric acid vapor treatment method to enhance the thermoelectric (TE) performance of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) thin-films. The H2SO4 vapor treatment brought about the reduction of Coulomb interaction between PEDOT and PSS chains and structural rearrangement of PEDOT:PSS as expanded coil-like nanostructure. We studied the effects of the H2SO4 vapor treatment on the electrical conductivity and TE properties of PEDOT:PSS thin-films at various treatment temperatures. By the H2SO4 vapor treatment at 140 °C, both electrical conductivity and Seebeck coefficient of the PEDOT:PSS thin-film were improved from 1.1 to 1167 S/cm, and from 7.3 to 12.1 μV/K, respectively. At this condition, the maximum power factor of 17.0 μW/mK2 was obtained, which is higher than that of the pristine PEDOT:PSS film (0.006 μW/mK2) by the factor of 2833. Because the H2SO4 vapor treatment method introduced here has advantages in the large-area process and the film uniformity, we believe that the method can be applicable to various organic electronic devices using PEDOT:PSS as well as TE devices.
KeywordsPower Factor PbTe Bi2Te3 Seebeck Coefficient High Power Factor
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2014R1A1A2055322 and NRF-2015R1D1A1A01060185).
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