T型有机器件自旋注入效率的提高  

Enhancement of spin injection efficiency in a T-shaped organic device

作　　者：宋瑞荣[1] 任俊峰[1] 窦兆涛[1] 原晓波[1] 胡贵超[1] 

机构地区：[1]山东师范大学物理与电子科学学院,济南250014

出　　处：《中国科学：物理学、力学、天文学》2013年第2期129-134,共6页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家自然科学基金(批准号:10904083;10904084);山东省中青年科学家科研奖励基金(编号:BS2009CL008)资助项目

摘　　要：考虑到有机半导体中特殊的载流子电荷自旋关系,建立了一个自旋注入有机半导体的简单的T型器件模型,运用自旋扩散理论计算得出了此模型的电流自旋极化率并与铁磁/有机半导体异质结构的注入效率进行了比较.理论计算发现T型模型中通过调节分支电流的大小会使自旋极化率较铁磁/有机半导体模型有明显的提高,并讨论了极化子比率、外加电场、自旋相关界面电阻以及有机半导体电导率等因素对电流自旋极化性质的影响.Considering the special charge-spin relationships of the carries in organic semiconductors, a simple T-shaped model of organic spin injection device is constructed. Based on the spin-diffusion theory, the current-spin polarization of the T-shaped device is theoretically obtained. It is found that by adjusting the branching current the spin polarization in this T-shaped device is enhanced distinctly compared with precious ferromagnetic/organic semiconductor model. The effects of polaron ratio, electric field and conductivity of the organic semiconductor on current spin polarization of the T-shaped device are also discussed.

关 键 词：有机自旋电子学 自旋注入 自旋扩散理论 极化子 

分 类 号：TN304.5[电子电信—物理电子学]