中文摘要：

在有机半导体自旋电子器件中，自旋从铁磁极注入到有机半导体后，自旋相上的极化子和自旋向下的极化子有不同的态密度，从而产生不同的电导。利用自旋漂移-扩散方程通过自洽计算得到了铁磁／有机半导体自旋注入结构中极化子自旋相关的电导和电流的自旋极化率。计算结果表明，极化子电导的自旋相关性是自旋注入引起的，和电流的自旋极化率密切相关；在自旋注入发生后，有机半导体内不同位置上极化子自旋态密度不同，由此产生的极化子电导也不相同，极化子电导是位置的函数。另外还发现，外电场会增强有机半导体电流的自旋极化率。

英文摘要：

In the work, the spin-dependent electrical conductivity and the current spin polarization are self-consistently derived applying the spin drift-diffusion equation on the ferromagnetic （FM）/organic （OSE） structure. The calculations show that the spin dependence of the electrical conductivity is induced by the spin injection and closely related to the current spin polarization. Spin injection make the spin density of the polarons different at the different position in the organic semiconductor. So the electrical conductivity induced by up-spin polarons （down-spin polarons） is different, too. The spin-dependent electrical conductivity is position-dependent in the organic semiconductor. In addition, it is found that in the low-voltage regime （eV〈〈kBT）, the electric-field can enhance the current spin polarization in the FM/OSE system.