Enhancing dopant diffusion for ultrahigh electrical conductivity and efficient thermoelectric conversion in conjugated polymers

IF 38.6 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Joule Pub Date : 2023-10-18 DOI:10.1016/j.joule.2023.09.002

Sang Eun Yoon , Yeongkwon Kang , Jaemin Im , Jiyun Lee , Sang Yeon Lee , Jaehong Park , Yuan Jun Gao , Dohyeon Jeon , Ji Yoen Son , Jisu Kim , Christina J. Kousseff , Taekyeong Kim , Hyungtak Seo , Keehoon Kang , Iain McCulloch , Sang Kyu Kwak , Hyun Ho Choi , Bong-Gi Kim , Jong H. Kim

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Abstract

Organic thermoelectric (TE) attracts considerable interest as a next-generation energy conversion technology; however, its practical application is still restricted by low power factors. Herein, we report a generally applicable solvent-combination doping method for improving TE properties of conjugated polymers (CPs). Residual solvents in a ternary solvent enlarged the free volume in the CP films. This beneficial effect boosted both dopant diffusion efficiency and charge carrier density in the doped films, resulting in the remarkable enhancement of electrical conductivity in the CPs. When the doped CP films processed with a ternary solvent were applied to TE devices, excellent power factors were achieved, attributed to a durable Seebeck coefficient along with ultrahigh electrical conductivity.

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增强掺杂剂扩散以实现共轭聚合物的超高电导率和高效热电转换

有机热电（TE）作为下一代能源转换技术引起了人们的极大兴趣；然而，它的实际应用仍然受到低功率因数的限制。在此，我们报道了一种普遍适用的溶剂组合掺杂方法，用于改善共轭聚合物（CP）的TE性能。三元溶剂中的残留溶剂增大了CP膜中的自由体积。这种有益的效果提高了掺杂膜中的掺杂剂扩散效率和电荷载流子密度，从而显著提高了CP中的电导率。当用三元溶剂处理的掺杂CP膜应用于TE器件时，由于持久的塞贝克系数和超高的电导率，获得了优异的功率因数。

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来源期刊

Joule Energy-General Energy

CiteScore

53.10

自引率

2.00%

发文量

198

期刊介绍： Joule is a sister journal to Cell that focuses on research, analysis, and ideas related to sustainable energy. It aims to address the global challenge of the need for more sustainable energy solutions. Joule is a forward-looking journal that bridges disciplines and scales of energy research. It connects researchers and analysts working on scientific, technical, economic, policy, and social challenges related to sustainable energy. The journal covers a wide range of energy research, from fundamental laboratory studies on energy conversion and storage to global-level analysis. Joule aims to highlight and amplify the implications, challenges, and opportunities of novel energy research for different groups in the field.