journal article·2024-09-02

Molecular Doping-Driven Modulation of Domain Charge Transport Elevates Thermoelectric Performance in Polar Polythiophene

Kaiqing Lu, Chen Chen, Jing-Liang Cheng, Ian E. Jacobs, Baiqiao Yue, Pochung Huang, Liang-Wen Feng, Yue Lin

ACS Materials Letters· Volume 6· Issue 9
Publisher page

Abstract

Unlocking outstanding thermoelectric performance in conjugated polymers (CPs) hinges on overcoming their intrinsically low charge mobility, resulting from their mixed crystalline–amorphous nature. Central to this challenge is to achieve synergistic intra- and interdomain charge transport in doped CPs. Taking polar polythiophene p(g 3 2T-T) as a model system, we demonstrate that ion exchange doping synergistically improves charge transport across both ordered and disordered regions, establishing a power factor of 63 μW m –1 K –2, a considerable leap forward for polar polythiophenes. We highlight that excess doping induced a solid-state molecular reorientation from edge-on to face-on, initiating a decline in charge mobility within crystalline domains, despite improvements in interdomain charge transport. Furthermore, we showcase a quantitative methodology to probe interdomain transport efficiency, taking activation energy W γ derived from weighted mobility as a key indicator. This study delineates a sophisticated framework for examining charge transport, underscoring the importance of fine-tuning both the amorphous and the crystalline regions.
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Research context

OpenAlex topics: Conducting polymers and applications · Advanced Thermoelectric Materials and Devices · Organic Electronics and Photovoltaics

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, and State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China

College of Chemistry and Materials Science, Fujian Normal University, Fuzhou, Fujian 350007, China

Fujian College, University of Chinese Academy of Sciences, Fuzhou, Fujian 350007, China

Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China

Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610065, China

Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, U.K.

Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, Fujian 350108, P. R. China

Funding

Royal Society · Natural Science Foundation of Hunan Province · Science Fund for Distinguished Young Scholars of Fujian Province · Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China · National Natural Science Foundation of China · Science and Technology Projects of Fujian Province · Chinese Academy of Sciences · Fuzhou Technology Innovation Platform · Pilot Project of Fujian Province · University of Defense Technology Research Project · National Defense Key Laboratory of Science and Technology Fund

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