Manipulating the π-electron magnetism of single-molecule junctions is an effective means to improve the electronic and spin-polarized thermoelectric transport properties. Here, using the density functional theory combined with the nonequilibrium Green's function method, we demonstrate that the electronic conductance (σ) of molecular junctions (MJs) can be significantly enhanced by organic radicals due to the shifting of resonant states. Moreover, we find that the spin-dependent quantum interference (SDQI) effects can be largely influenced by organic radicals. The SDQI effects result in nearly 100% spin filtering efficiency in open-shell molecules and greatly enhance the Seebeck coefficients. As a result, the thermoelectric performances of open-shell MJs at room temperature are greatly improved through the combined effects of radicals and SDQI. In particular, the maximum ZTsp in the four radical junctions reaches up to 36.5. Our results show great potential for improving thermoelectric performance through the utilization of quantum interference and organic radical.
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4 March 2024
Research Article|
March 04 2024
Radical and quantum interference-enhanced thermoelectric performance of the junctions based on porphyrin dimer molecules
Special Collection:
Carbon-based Materials for Energy Conversion and Storage
Lin Huang
;
Lin Huang
a)
(Conceptualization, Data curation, Formal analysis, Methodology, Software, Writing – original draft)
1
School of Energy and Mechanical Engineering, Energy materials computing center, Jiangxi University of Science and Technology
, Nanchang 330013, China
a)Authors to whom correspondence should be addressed: lin_huang@hnu.edu.cn and keqiuchen@hnu.edu.cn, Tel.: +86 0731-88821829
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Jue Wang
;
Jue Wang
(Data curation, Investigation)
2
Department of Applied Physics, School of Physics and Electronics, Hunan University
, Changsha 410082, China
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Tong Chen
;
Tong Chen
(Visualization)
1
School of Energy and Mechanical Engineering, Energy materials computing center, Jiangxi University of Science and Technology
, Nanchang 330013, China
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Liang Xu
;
Liang Xu
(Software)
1
School of Energy and Mechanical Engineering, Energy materials computing center, Jiangxi University of Science and Technology
, Nanchang 330013, China
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Feng Ning;
Feng Ning
(Supervision)
3
School of Physics and Electronics, Nanning Normal University
, Nanning 530001, China
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Dan Wu;
Dan Wu
(Methodology)
4
Hunan Provincial Key Laboratory of Flexible Electronic Materials Genome Engineering, School of Physics and Electronic Science, Changsha University of Science and Technology
, Changsha 410114, China
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Ke-Qiu Chen
Ke-Qiu Chen
a)
(Writing – review & editing)
2
Department of Applied Physics, School of Physics and Electronics, Hunan University
, Changsha 410082, China
a)Authors to whom correspondence should be addressed: lin_huang@hnu.edu.cn and keqiuchen@hnu.edu.cn, Tel.: +86 0731-88821829
Search for other works by this author on:
a)Authors to whom correspondence should be addressed: lin_huang@hnu.edu.cn and keqiuchen@hnu.edu.cn, Tel.: +86 0731-88821829
Appl. Phys. Lett. 124, 102403 (2024)
Article history
Received:
September 17 2023
Accepted:
February 17 2024
Citation
Lin Huang, Jue Wang, Tong Chen, Liang Xu, Feng Ning, Dan Wu, Ke-Qiu Chen; Radical and quantum interference-enhanced thermoelectric performance of the junctions based on porphyrin dimer molecules. Appl. Phys. Lett. 4 March 2024; 124 (10): 102403. https://doi.org/10.1063/5.0176856
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