Halogenated-edge polymeric semiconductor for efficient spin transport

Xueli Yang, Ankang Guo, Jie Yang, Jinyang Chen, Ke Meng, Shunhua Hu, Ran Duan, Mingliang Zhu, Wenkang Shi, Yang Qin, Rui Zhang, Haijun Yang, Jikun Li, Lidan Guo (), Xiangnan Sun (), Yunqi Liu () and Yunlong Guo ()
Additional contact information
Xueli Yang: Institute of Chemistry Chinese Academy of Sciences
Ankang Guo: Institute of Chemistry Chinese Academy of Sciences
Jie Yang: Institute of Chemistry Chinese Academy of Sciences
Jinyang Chen: Institute of Chemistry Chinese Academy of Sciences
Ke Meng: National Center for Nanoscience and Technology
Shunhua Hu: National Center for Nanoscience and Technology
Ran Duan: Chinese Academy of Science
Mingliang Zhu: Institute of Chemistry Chinese Academy of Sciences
Wenkang Shi: Institute of Chemistry Chinese Academy of Sciences
Yang Qin: National Center for Nanoscience and Technology
Rui Zhang: Beijing University of Technology
Haijun Yang: Tsinghua University
Jikun Li: University of Chinese Academy of Sciences
Lidan Guo: National Center for Nanoscience and Technology
Xiangnan Sun: National Center for Nanoscience and Technology
Yunqi Liu: Institute of Chemistry Chinese Academy of Sciences
Yunlong Guo: Institute of Chemistry Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Organic semiconductors (OSCs) are featured by weak spin-orbit coupling due to their light chemical element composition, which enables them to maintain spin orientation for a long spin lifetime and show significant potential in room-temperature spin transport. Carrier mobility and spin lifetime are the two main factors of the spin transport performance of OSCs, however, their ambiguous mechanisms with molecular structure make the development of spintronic materials really stagnant. Herein, the effects of halogen substitution in bay-annulated indigo-based polymers on carrier mobility and spin relaxation have been systematically investigated. The enhanced carrier mobility with an undiminished spin lifetime contributes to a 3.7-fold increase in spin diffusion length and a record-high magnetoresistance of 8.7% at room temperature. By analyzing the spin-orbit coupling and hyperfine interaction, it was found that the distance of the substitution site from the conjugated center and the nitrogen atoms in the molecules play crucial roles in spin relaxation. Based on the above results, we proposed a molecular design strategy of halogen substitution far from conjugate center to enhance spin transport efficiency, presenting a promising avenue for advancing the field of organic spintronics.

Date: 2024
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DOI: 10.1038/s41467-024-52770-z

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