期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 7, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202113078
关键词
chemical doping; metal-free polymerization; organic thermoelectrics; rigid semiconducting polymers; synthetic methods
资金
- KAUST
- Office of Sponsored Research (OSR) [OSR-2018-CRG/CCF-3079, OSR-2019-CRG8-4086, OSR-2018-CRG7-3749]
- ERC Synergy Grant SC2 [610115]
- European Union's Horizon 2020 research and innovation program [952911, 862474]
- EPSRC Project [EP/T026219/1B]
- National Science Foundation [NSF DMR-1751308]
- DOE Office of Science [DE-AC02-06CH11357]
- Knut and Alice Wallenberg foundation
- Swedish Research Council [2020-03243]
- Olle Engkvists Stiftelse [204-0256]
- EC [GA-955837]
- Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009-00971]
Increasing the benzene content to increase the lactone group density can enhance the electron affinity, favoring the doping process, and significantly increasing the electrical conductivity.
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 mu Wm(-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.
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