【摘要】 对于有机薄膜器件(包括有机电致发光器件(OLED)和有机场效应晶体管(OTFT)),器件的电流机制直接决定了器件的性能,因此深刻理解其相关机理是十分必要的。虽然对于有机薄膜器件的电学性能研究较早,但是由于器件结构及有机薄膜内部影响机制的复杂性使得不同学者的研究结果很不一致。为此,文章以相同的镁银合金(MgAg)为电极,有机电子传输及发光材料八羟基喹啉铝(Alq3)为有机功能层,深入研究了MgAg/Alq3/MgAg器件的电流机制。测试及拟合结果表明,该器件为单电子器件,器件的电流属陷阱电荷限制电流机制。不同温度下的测试结果表明,随着温度增加器件电流迅速增加,这是因为随温度增加,器件中载流子的浓度和迁移率呈指数上升。更多还原

【Abstract】 For organic thin film devices(OTFD),such as organic light-emitting diode(OLED) and organic thin film triode(OTFT),the electrical current mechanism of devices governs the performance of devices,as a result,it is inevitable to understand the relative theory.Although there have already been lots of reports on electrical performance of OTFD,the results of them deviate from each other due to the complexity of device structure and internal mechanism of organic thin film.In this study,by using magnesium-silver alloy(MgAg) as both electrodes and 8-hydroxy quinoline aluminum(Alq3),which was widely applied as electron transporter and light-emitter,as organic functional layer,electrical current mechanism of sandwich device of MgAg/Alq3/MgAg was studied.The measured and fit results indicate that the device is electron-only device,whilst device current obeys trapped charge limited current(TCLC) mechanism.In addition,device current increases with the increase of temperature,which is attributed to the fact that the concentration and mobility of carriers have an exponential relation with negative reciprocal of temperature.更多还原