Volume 134, Issue 7 e202113078
Forschungsartikel

Lactone Backbone Density in Rigid Electron-Deficient Semiconducting Polymers Enabling High n-type Organic Thermoelectric Performance

Maryam Alsufyani

Corresponding Author

Maryam Alsufyani

Department of Chemistry, University of Oxford, Oxford, OX1 3TA UK

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Marc-Antoine Stoeckel

Marc-Antoine Stoeckel

Department of Science and Technology, Linköping University, 60174 Norrköping, Sweden

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Xingxing Chen

Xingxing Chen

Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900 Saudi Arabia

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Karl Thorley

Karl Thorley

Department of Chemistry, University of Kentucky, Lexington, KY, 40506-0055 USA

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Rawad K. Hallani

Rawad K. Hallani

Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900 Saudi Arabia

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Yuttapoom Puttisong

Yuttapoom Puttisong

Department of Physics, Chemistry and Biology, Linköping University, 58183 Linköping, Sweden

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Xudong Ji

Xudong Ji

Department of Biomedical Engineering, Department of Materials Science and Engineering, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208 USA

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Dilara Meli

Dilara Meli

Department of Biomedical Engineering, Department of Materials Science and Engineering, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208 USA

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Bryan D. Paulsen

Bryan D. Paulsen

Department of Biomedical Engineering, Department of Materials Science and Engineering, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208 USA

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Joseph Strzalka

Joseph Strzalka

X-Ray Science Division, Argonne National Laboratory, Lemont, IL, 60439 USA

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Khrystyna Regeta

Khrystyna Regeta

Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900 Saudi Arabia

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Craig Combe

Craig Combe

Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900 Saudi Arabia

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Hu Chen

Hu Chen

Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900 Saudi Arabia

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Junfu Tian

Junfu Tian

Department of Chemistry, University of Oxford, Oxford, OX1 3TA UK

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Prof. Jonathan Rivnay

Prof. Jonathan Rivnay

Department of Biomedical Engineering, Department of Materials Science and Engineering, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208 USA

Simpson Querrey Institute, Northwestern University, Chicago, IL 60611 USA

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Prof. Simone Fabiano

Prof. Simone Fabiano

Department of Science and Technology, Linköping University, 60174 Norrköping, Sweden

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Prof. Iain McCulloch

Corresponding Author

Prof. Iain McCulloch

Department of Chemistry, University of Oxford, Oxford, OX1 3TA UK

Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900 Saudi Arabia

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First published: 19 November 2021
Citations: 8

Abstract

Three lactone-based rigid semiconducting polymers were designed to overcome major limitations in the development of n-type organic thermoelectrics, namely electrical conductivity and air stability. Experimental and theoretical investigations demonstrated that increasing the lactone group density by increasing the benzene content from 0 % benzene (P-0), to 50 % (P-50), and 75 % (P-75) resulted in progressively larger electron affinities (up to 4.37 eV), suggesting a more favorable doping process, when employing (N-DMBI) as the dopant. Larger polaron delocalization was also evident, due to the more planarized conformation, which is proposed to lead to a lower hopping energy barrier. As a consequence, the electrical conductivity increased by three orders of magnitude, to achieve values of up to 12 S cm and Power factors of 13.2 μWm−1 K−2 were thereby enabled. These findings present new insights into material design guidelines for the future development of air stable n-type organic thermoelectrics.

Conflict of interest

The authors declare no conflict of interest.

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