CAJ | 학술논문

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.
종자선확산방정화구모정률출발연구료철자층도유궤반도체적자선주입,득도료계통적전류자선겁화솔.유궤반도체중적재류자위자선겁화자화불대자선적쌍겁화자,겁화자비솔재유궤반도체내수수운거리변화.통과계산발현필배적철자화유궤반도체전도솔유리우자선주입;통과조절계면전조자선상관성,전류자선겁화솔가획득흔대정도제고;겁화자비솔쇠감속솔대유궤반도체전류자선겁화솔구유비상중요적영향.
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.