极化子比率变化对自旋注入有机半导体性质的影响

从自旋扩散方程和欧姆定律出发研究了铁磁层到有机半导体的自旋注入，得到了系统的电流自旋极化率。有机半导体中的载流子为自旋极化子和不带自旋的双极化子，极化子比率在有机半导体内随输运距离变化。通过计算发现匹配的铁磁和有机半导体电导率有利于自旋注入；通过调节界面电阻自旋相关性，电流自旋极化率可获得很大程度提高；极化子比率衰减速率对有机半导体电流自旋极化率具有非常重要的影响。

Spin polarized injection into organic semiconductors with variational polaron proportion

We have studied the spin polarized injection from a ferromagnetic contact into an organic semiconductor from spin diffusion theory and Ohm's law. Carriers in organic semiconductors include spin polarons as well as spinless bipolarons, and we assume that the variational polaron proportion decreases exponentially into the organic semiconductor in the structure of ferromagnetic/organic semiconductor. Effects of the decreasing rate of polarons on the current spin polarization are discussed. Current spin polarization may be amplified by tuning the spin-related interfacial resistances. It is also found that the conductivity matching is an important factor for efficient spin polarized injection into organic semiconductors.