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Research Article | Open Access

Scalable fabrication of ultrahigh-conductivity SWCNT films via aredispersion method for photovoltaic/thermoelectric coupling systems

Xiaoyang Yuan1,2, Dehua Yang1,2,3 (), Xiaofei Yang1,2, Xuan Chang1,2, Donghui Zhang1,2, Aiai Wang1,2, Yiming Xu1,2, Xueliang Yang1, Jingxin Chen3, Xuejian Li3, Shuai Ma3, Qing Gao1,2,3, Shufang Wang2, Huaping Liu4, Jianhui Chen1,2,3 ()
Advanced Passivation Technology Lab, College of Physics Science andTechnology, Hebei University, Baoding 071002, China
Province-Ministry Co-Construction Collaborative Innovation Centerof Hebei Photovoltaic Technology, College of Physics Science and Technology, HebeiUniversity, Baoding 071002, China
State Key Laboratory of Photovoltaic Materials and Cells, YingliGroup Co., Ltd, Baoding 071051, China
Beijing National Laboratory for Condensed Matter Physics, Instituteof Physics, Chinese Academy of Sciences, Beijing 100190, China
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This study presents a scalable method for producing large-area, highly conductivenematic single-walled carbon nanotube (SWCNT) films using an improvedredispersion technique that enables uniform drying and nematic phase formationin polymer-dispersed SWCNTs, achieving A4-sized films with a conductivity of1.97 MS/m. The films also exhibit a thermoelectric power factor of 654 μW/(m·K2), demonstrating potential for hybrid photovoltaic/thermoelectricapplications.

Abstract

Photovoltaic/thermoelectric (PV/TE) coupling systems simultaneously cool solarcells and recover waste heat. Single-wall carbon nanotubes (SWCNTs) films areexpected to simultaneously exhibit their electrical conductivity, thermalconductivity, and thermoelectric properties in this application. FabricatingSWCNTs films with polymer-dispersed SWCNTs are simple, safe, and scalable.However, the difficulty in simultaneously enhancing both dispersion quality andSWCNT concentration significantly limit the electrical conductivity of thesefilms. Herein, we develop a SWCNT redispersion method in Nafion ethanol systemto achieve well-dispersion at high SWCNT concentrations. Using this dispersion,A4-sized films were readily prepared, achieving remarkable electricalconductivity of 1.97 MS/m. The large-area film exhibits a high power factor(654.37 μW/(m·K2)) and apparent thermal conductivity (529 W/(m·K)),and is integrated into a 330 cm2 thermoelectric/photovoltaic couplingsystem. The PV output power increases by 220 mW. An additional 70 mVthermoelectric voltage is generated. Moreover, the investigation of the dryingprocess unravels how polymer, solvent and SWCNT concentration collectivelydominate the film uniformity. This work significantly enhances the electricalconductivity of polymer-dispersed SWCNTs and explores an application directionthat simultaneously utilizes their high thermoelectric performance and thermalconductivity, highlighting their great application potential in PV/TE systems.

Keywords

single-wall carbon nanotubedispersionhigh-conductivity filmsthermoelectricphotovoltaic/thermoelectric coupling

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Nano Research
Volume 18 Issue 5,
May 2025
Article number: 94907383
DOI: 10.26599/NR.2025.94907383
Cite this article:
Yuan X, Yang D, Yang X, et al. Scalable fabrication of ultrahigh-conductivity SWCNT films via aredispersion method for photovoltaic/thermoelectric coupling systems. Nano Research, 2025, 18(5): 94907383. https://doi.org/10.26599/NR.2025.94907383
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