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材料的迁移率是其关键电学特性之一.有机材料迁移率的研究对于有机电致发光器件、有机太阳电池、有机薄膜场效应晶体管性能的提高有重要的意义.应用简单易行的空间电荷限制电流方法,对基于三(8-羟基喹啉)铝(Alq_3)的四种单载流子器件电流密度-电压曲线特性进行研究,根据空间电荷限制电流模型,拟合出Alq_3材料在四种器件中的零场电子迁移率和电场依赖因子,并且给出Alq_3电子迁移率随外加偏压的变化趋势.实验结果表明,顶电极铝蒸镀到缓冲层氟化锂(1 nm)和Alq3(100 nm)的表面后,可以明显改善Alq_3的零场迁移率和电场依赖因子.认为产生这种现象的原因是氟化锂可以使铝和Alq_3发生络合反应,形成Li~(+1)Alq~(-1)粒子,形成良好的欧姆接触,使得电子的注入效率大大提高.
The mobility of materials is one of the key electrical characteristics.Studies on the mobility of organic materials are of great significance for the improvement of the performance of organic electroluminescent devices, organic solar cells and organic thin-film field-effect transistors.Using the simple space charge limitation Current method, the current density-voltage curve characteristics of four kinds of single-carrier devices based on aluminum (Alq_3) tris (8-quinolinolato) aluminum were studied. According to the space charge limited current model, And the dependence of the electron mobility of Alq 3 on the bias voltage is given.The experimental results show that the top electrode aluminum is deposited on the buffer layers of lithium fluoride (1 nm) and Alq 3 (100) nm) surface can significantly improve the zero-field mobility and electric field-dependent factor of Alq_3.The reason for this phenomenon is that lithium fluoride can make aluminum and Alq_3 complex reaction to form Li ~ (+1) Alq ~ (-1) particles, forming a good ohmic contact, making the electron injection efficiency greatly increased.