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Interplay between Side Chain Density and Polymer Alignment: Two Competing Strategies for Enhancing the Thermoelectric Performance of P3HT Analogues
Chemistry of Materials ( IF 7.2 ) Pub Date : 2023-10-26 , DOI: 10.1021/acs.chemmater.3c01680
Peter A Gilhooly-Finn 1, 2 , Ian E Jacobs 3 , Olivier Bardagot 4 , Yasser Zaffar 2 , Antoine Lemaire 5 , Shubhradip Guchait 5 , Lu Zhang 3 , Mark Freeley 2 , William Neal 2 , Fanny Richard 6 , Matteo Palma 2 , Natalie Banerji 4 , Henning Sirringhaus 3 , Martin Brinkmann 5 , Christian B Nielsen 2
Chemistry of Materials ( IF 7.2 ) Pub Date : 2023-10-26 , DOI: 10.1021/acs.chemmater.3c01680
Peter A Gilhooly-Finn 1, 2 , Ian E Jacobs 3 , Olivier Bardagot 4 , Yasser Zaffar 2 , Antoine Lemaire 5 , Shubhradip Guchait 5 , Lu Zhang 3 , Mark Freeley 2 , William Neal 2 , Fanny Richard 6 , Matteo Palma 2 , Natalie Banerji 4 , Henning Sirringhaus 3 , Martin Brinkmann 5 , Christian B Nielsen 2
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A series of polythiophenes with varying side chain density was synthesized, and their electrical and thermoelectric properties were investigated. Aligned and non-aligned thin films of the polymers were characterized in the neutral and chemically doped states. Optical and diffraction measurements revealed an overall lower order in the thin films with lower side chain density, also confirmed using polarized optical experiments on aligned thin films. However, upon doping the non-aligned films, a sixfold increase in electrical conductivity was observed for the polythiophene with the lowest side chain density compared to poly(3-hexylthiophene) (P3HT). We found that the improvement in conductivity was not due to a larger charge carrier density but an increase in charge carrier mobility after doping with 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ). On the other hand, doped aligned films did not show the same trend; lower side chain density instead led to a lower conductivity and Seebeck coefficient compared to those for P3HT. This was attributed to the poorer alignment of the polymer thin films with lower side chain density. The study demonstrates that optimizing side chain density is a synthetically simple and effective way to improve electrical conductivity in polythiophene films relevant to thermoelectric applications.
中文翻译：
侧链密度与聚合物排列之间的相互作用：增强 P3HT 类似物热电性能的两种竞争策略
合成了一系列具有不同侧链密度的聚噻吩，并研究了它们的电学和热电性能。聚合物的对准和非对准薄膜在中性和化学掺杂状态下进行表征。光学和衍射测量揭示了具有较低侧链密度的薄膜的整体较低阶，这也通过对排列薄膜进行偏振光学实验得到证实。然而，在对非排列薄膜进行掺杂后，与聚（3-己基噻吩）（P3HT）相比，具有最低侧链密度的聚噻吩的电导率增加了六倍。我们发现电导率的提高并不是由于载流子密度较大，而是由于掺杂 2,3,5,6-四氟-7,7,8,8-四氰基对醌二甲烷 (F4TCNQ) 后载流子迁移率的增加。另一方面，掺杂的取向膜则没有表现出同样的趋势。与 P3HT 相比，较低的侧链密度反而导致较低的电导率和塞贝克系数。这是由于侧链密度较低的聚合物薄膜的排列较差。该研究表明，优化侧链密度是一种综合简单而有效的方法，可以提高与热电应用相关的聚噻吩薄膜的电导率。
更新日期：2023-10-26
中文翻译：
侧链密度与聚合物排列之间的相互作用：增强 P3HT 类似物热电性能的两种竞争策略
合成了一系列具有不同侧链密度的聚噻吩，并研究了它们的电学和热电性能。聚合物的对准和非对准薄膜在中性和化学掺杂状态下进行表征。光学和衍射测量揭示了具有较低侧链密度的薄膜的整体较低阶，这也通过对排列薄膜进行偏振光学实验得到证实。然而，在对非排列薄膜进行掺杂后，与聚（3-己基噻吩）（P3HT）相比，具有最低侧链密度的聚噻吩的电导率增加了六倍。我们发现电导率的提高并不是由于载流子密度较大，而是由于掺杂 2,3,5,6-四氟-7,7,8,8-四氰基对醌二甲烷 (F4TCNQ) 后载流子迁移率的增加。另一方面，掺杂的取向膜则没有表现出同样的趋势。与 P3HT 相比，较低的侧链密度反而导致较低的电导率和塞贝克系数。这是由于侧链密度较低的聚合物薄膜的排列较差。该研究表明，优化侧链密度是一种综合简单而有效的方法，可以提高与热电应用相关的聚噻吩薄膜的电导率。
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