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Thermoelectric polymer films with a significantly high Seebeck coefficient and thermoelectric power factor obtained through surface energy filtering
Journal of Materials Chemistry A ( IF 11.9 ) Pub Date : 2020-06-19 , DOI: 10.1039/d0ta05324d
Xin Guan 1, 2, 3 , Erol Yildirim 3, 4, 5, 6, 7 , Zeng Fan 1, 2, 3 , Wanheng Lu 2, 3, 8 , Bichen Li 1, 2, 3 , Kaiyang Zeng 2, 3, 8 , Shuo-Wang Yang 3, 4, 5 , Jianyong Ouyang 1, 2, 3
Affiliation  

Thermoelectric (TE) polymers have unique advantages in converting heat into electricity. But their Seebeck coefficient is lower than that of inorganic TE materials by about one order of magnitude. Here, surface energy filtering is proposed to significantly enhance the Seebeck coefficient of TE polymers. The as-prepared poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS, the most popular TE polymer) films from aqueous solution have a low Seebeck coefficient of 15–18 μV K−1 and a power factor of ∼0.008 μW m−1 K−2. Depositing Rhodamine 101, a zwitterion, on PEDOT:PSS films can enhance the Seebeck coefficient to 47.2 μV K−1 and the power factor to 401.2 μW m−1 K−2. The Rhodamine 101 effect on the Seebeck coefficient is consistent with its effect on the work function of PEDOT:PSS. The enhancement in the Seebeck coefficient is ascribed to the dipole moment of Rhodamine 101 and the interfacial dipole moment formed at the surface of the PEDOT:PSS films. This is confirmed by theoretical simulations. We call this mechanism surface energy filtering. Surface energy filtering can increase the mean energy of the transporting carriers and thus the Seebeck coefficient of the PEDOT:PSS films while only slightly affecting the electrical conductivity. It can thus significantly enhance the Seebeck coefficient and the power factor simultaneously.

中文翻译:

通过表面能过滤获得的塞贝克系数和热电功率因数非常高的热电聚合物薄膜

热电(TE)聚合物在将热量转化为电能方面具有独特的优势。但是它们的塞贝克系数比无机TE材料低约一个数量级。这里,提出了表面能过滤以显着提高TE聚合物的塞贝克系数。由水溶液制备的聚(3,4-乙撑二氧噻吩):聚(苯乙烯磺酸盐)(PEDOT:PSS,最受欢迎的TE聚合物)薄膜的Seebeck系数低,为15–18μVK -1,功率因数为〜0.008μWm -1 K -2。在PEDOT:PSS膜上沉积两性离子若丹明101可以将塞贝克系数提高到47.2μVK -1,功率因数提高到401.2μWm -1 K -2。罗丹明101对塞贝克系数的影响与其对PEDOT:PSS功函数的影响一致。Seebeck系数的提高归因于若丹明101的偶极矩和在PEDOT:PSS薄膜表面形成的界面偶极矩。理论模拟证实了这一点。我们称这种机制为表面能过滤。表面能过滤可以增加传输载流子的平均能量,从而增加PEDOT:PSS薄膜的塞贝克系数,同时仅稍微影响电导率。因此,它可以同时显着提高塞贝克系数和功率因数。
更新日期:2020-07-14
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