Simultaneous Increases in Electrical Conductivity and Seebeck Coefficient of PEDOT:PSS Films by Adding Ionic Liquids into a Polymer Solution
Simultaneous Increases in Electrical Conductivity and Seebeck Coefficient of PEDOT:PSS Films by Adding Ionic Liquids into a Polymer Solution
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通过将离子液体添加到聚合物溶液中同时提高 PEDOT:PSS 薄膜的电导率和塞贝克系数
DOI：
10.1007/s11664-012-1942-8
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发表时间：
2012-04-01
影响因子：
2.1
通讯作者：
Kong, Fangfang
中科院分区：
文献类型：
--
作者：
Liu, Congcong;Xu, Jingkun;Kong, Fangfang
在聚合物的聚合物溶液中加入离子液体(IL)，同时提高了poly(3，4-ethylenedioxythiophene)：poly(styrenesulfonate)薄膜的电导率和塞贝克系数。这种PEDOT：Pss/IL薄膜的最大电导率在S−1时达到174cmPSS，比纯PEDOT：PSS薄膜高出一个数量级以上，最大塞贝克系数高达30μV·K−1，是纯PEDOT：PSS薄膜的两倍多。这一行为不同于传统的热电材料，热电材料的热电性质具有很强的相关性，如电导率随载流子浓度的增加而增加，通常会导致Seebeck系数的对数下降。对PEDOT：PSS/IL薄膜的原子力显微镜图像表明，离子液体诱导形成了一种特殊的三维结构的高导电性PEDOT颗粒，从而改善了PEDOT：PSS薄膜的TE性能。
The electrical conductivity and Seebeck coefficient of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) films were simultaneously improved by adding an ionic liquid (IL) into a polymer solution of the polymers. The maximum electrical conductivity of such a PEDOT:PSS/IL film reached 174 S cm−1, more than an order of magnitude higher than that of pure PEDOT:PSS film, and the maximum Seebeck coefficient was up to 30 μV K−1, more than twice the value for pure PEDOT:PSS film. This behavior is different from conventional thermoelectric (TE) materials, whose TE properties are strongly correlated, such as increasing electrical conductivity with increasing carrier concentration, usually resulting in a logarithmic decrease in Seebeck coefficient. Atomic force microscopy images of the PEDOT:PSS/IL films indicated that the ILs induced formation of a particular three-dimensional structure of highly conducting PEDOT grains, resulting in improvement of the TE performance of PEDOT:PSS films.