Limelette Patrice, Leclerc Nicolas, Brinkmann Martin
GREMAN UMR 7347, Université de Tours, CNRS, INSA CVL, Parc de Grandmont, 37200, Tours, France.
Université de Strasbourg, CNRS, ICPEES UMR 7515, 67087, Strasbourg, France.
Sci Rep. 2023 Nov 30;13(1):21161. doi: 10.1038/s41598-023-48353-5.
Understanding transport phenomena in conducting polymers (CP) is a main issue in order to optimize their performance and despite intense investigations, the influence of their microstructure remains controversial. By analyzing the thermoelectric measurements performed on highly oriented and non-oriented CP films, we show that an Heterogeneous Oriented Structure (HOSt) model considering both ordered and disordered domains is able to account for the thermoelectric transport in CP. This model unveils the key role of the crystallinity, the anisotropy and the alignment degree of these domains. It points out the importance of the thermal conductivity in the interpretation of the thermopower [Formula: see text] and explains the frequently observed electrical conductivity [Formula: see text] cut-off in the [Formula: see text] curves due to the disordered domains. By varying the alignment degree depending on the orientation and the anisotropy according to the face-on or the edge-on polymers conformation, the HOSt model successfully describes the overall measured thermoelectric properties by demonstrating its applicability to a wide variety of both oriented and non-oriented CP.
为了优化导电聚合物（CP）的性能，理解其输运现象是一个主要问题。尽管进行了大量研究，但它们的微观结构的影响仍存在争议。通过分析对高度取向和非取向CP薄膜进行的热电测量，我们表明，考虑有序和无序域的异质取向结构（HOSt）模型能够解释CP中的热电输运。该模型揭示了这些域的结晶度、各向异性和排列程度的关键作用。它指出了热导率在解释热电势[公式：见正文]中的重要性，并解释了在[公式：见正文]曲线中由于无序域而经常观察到的电导率[公式：见正文]截止现象。通过根据聚合物的面内或边缘取向以及各向异性改变排列程度，HOSt模型成功地描述了整体测量的热电性能，证明了其对各种取向和非取向CP的适用性。
