Polaron spin dynamics in high-mobility polymeric semiconductors
Polaron spin dynamics in high-mobility polymeric semiconductors
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DOI：
10.1038/s41567-019-0538-0
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发表时间：
2019-08-01
期刊：
影响因子：
19.6
通讯作者：
Sirringhaus, Henning
中科院分区：
文献类型：
--
作者：
Schott, Sam;Chopra, Uday;Sirringhaus, Henning
聚合物半导体表现出非常长的自旋寿命，最近观察到的共轭聚合物中的微米自旋扩散长度证明了有机自旋电子器件的潜力。弱的自旋轨道和超精细相互作用是它们长自旋寿命的根源，但自旋与环境的耦合机制仍然是难以捉摸的。在这里，我们提出了一个系统的研究极化子自旋寿命的场效应晶体管与高迁移率共轭聚合物作为有源层。我们演示了如何自旋弛豫是由电荷的跳跃运动在低温下，而一个埃利奥特-Yafet样的松弛由于一个瞬态本地化的载波波函数是负责自旋弛豫在高温下。在这个制度中，电荷，自旋和结构动力学密切相关，并敏感地依赖于聚合物主链的局部构象和聚合物链的结晶堆积。
Polymeric semiconductors exhibit exceptionally long spin lifetimes, and recently observed micrometre spin diffusion lengths in conjugated polymers demonstrate the potential for organic spintronics devices. Weak spin-orbit and hyperfine interactions lie at the origin of their long spin lifetimes, but the coupling mechanism of a spin to its environment remains elusive. Here, we present a systematic study of polaron spin lifetimes in field-effect transistors with high-mobility conjugated polymers as an active layer. We demonstrate how spin relaxation is governed by the charges' hopping motion at low temperatures, whereas an Elliott-Yafet-like relaxation due to a transient localization of the carrier wavefunctions is responsible for spin relaxation at high temperatures. In this regime, charge, spin and structural dynamics are intimately related and depend sensitively on the local conformation of polymer backbones and the crystalline packing of the polymer chains.