Enhancing Room‐Temperature Spin Lifetimes in Molecular Semiconductors by Designing Intramolecular Dipole Orientations
Abstract
Abstract In spintronics, achieving long spin lifetimes, particularly at room temperature (RT), is a key objective for spin transport materials. Molecular semiconductors (MSCs), with their inherently weak spin relaxation mechanisms, have emerged as promising candidates for realizing long RT spin lifetimes. However, effective strategies to suppress spin relaxation through the design of molecular structures in MSCs are still not well understood, and as a result, spin lifetimes remain limited (≈ 10‐µs level at RT). In this study, the impact of intramolecular dipole orientations on spin lifetimes in MSCs has been explored for the first time. Both theoretical and experimental results have demonstrated that dipole orientation influences the hyperfine interaction (HFI) effect (a main causation for spin relaxation), and thus, spin lifetime. By adjusting dipole arrangements through molecular design, it is demonstrated that the poly(2,6‐azuleneethynylene) with a regular dipole orientation served to reduce the HFI strength and ultimately extended the spin lifetime to 106 µs in a spintronic device, much higher than that of the random arrangement, setting a new RT record. This work provides new insights into the spin relaxation mechanism and offers a valuable strategy for extending spin lifetimes in MSCs for future RT spintronic applications.
Article Details
Authors (17)
Yang Qin
Meng Wu
Junjun Xiang
State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry University of Chinese Academy of Sciences Chinese Academy of Sciences Shanghai 200032 P. R. China
Tingting Yang
The MOE Basic Research and Innovation Center for the Targeted Therapeutics of Solid Tumors, School of Basic Medical Sciences, The Second Affiliated Hospital, Jiangxi Medical College, Nanchang University, Nanchang, Jiangxi, China.
Lidan Guo
Xianrong Gu
Laboratory of Nanosystem and Hierarchical Fabrication, Laboratory of Theoretical and Computational Nanoscience, Laboratory of Standardization and Measurement for Nanotechnology National Center for Nanoscience and Technology Beijing P. R. China
Rui Zhang
Xiangpeng Zhang
Laboratory of Nanosystem and Hierarchical Fabrication, Laboratory of Theoretical and Computational Nanoscience, Laboratory of Standardization and Measurement for Nanotechnology National Center for Nanoscience and Technology Beijing P. R. China
Ke Meng
Shunhua Hu
Ruiheng Zheng
Laboratory of Nanosystem and Hierarchical Fabrication, Laboratory of Theoretical and Computational Nanoscience, Laboratory of Standardization and Measurement for Nanotechnology National Center for Nanoscience and Technology Beijing P. R. China
Min Li
Yong Wang
Ye Zou
Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China.
Jianqi Zhang
Key Laboratory of Nanosystem and Hierarchical Fabrication
Xike Gao
Xiangnan Sun