Comparison of the drift mobility measured under transient and steady-state conditions in a prototypical hopping system
Comparison of the drift mobility measured under transient and steady-state conditions in a prototypical hopping system
复制标题
原型跳跃系统瞬态和稳态条件下测量的漂移迁移率的比较
DOI：
10.1080/13642818608240642
复制
发表时间：
1986
期刊：
影响因子：
--
通讯作者：
D. Pai
中科院分区：
文献类型：
--
作者：
M. Abkowtz;D. Pai
本文证明了在掺杂空穴传输分子四苯二胺（TPD）的聚碳酸酯薄膜中，Au、Ag和碳形成了空穴注入的欧姆接触，而在非晶TPD薄膜上，这些接触也是欧姆接触。在字段，使注入的空穴渡越时间小于体介电弛豫时间，这些薄膜的响应，在一个三明治单元配置与欧姆接触，阶梯场激发被证明是一个无陷阱的空间电荷限制（TFSCLC）电流。TFSCLC仅取决于体漂移迁移率和样品尺寸。这些电影提供了一个独特的机会，同时检查，在一个分散的传输介质，飞行时间的渡越时间，空间电荷注入瞬变，最后稳态SCLC。后者共同提供了在相同的外加电场中的不同时间的漂移迁移率的测量。因此，漂移迁移率的时间依赖特性可以完全描绘。
Abstract It is demonstrated that Au, Ag and carbon form ohmic contacts for hole injection in polycarbonate films doped with the hole-transporting molecule tetraphenyldiamine (TPD) and that these contacts are also ohmic on amorphous TPD films. At fields which make the injected hole transit time less than the bulk dielectric relaxation time, the response of these films, in a sandwich cell configuration with ohmic contacts, to step-field excitation is demonstrated to be a trap-free space-charge-limited (TFSCLC) current. The TFSCLC depends on the bulk drift mobility and the specimen dimensions only. These films provide a unique opportunity to examine simultaneously, in a dispersive transport medium, time-of-flight transit times, space-charge injection transients and finally steady-state SCLC. The latter collectively provide a measure of the drift mobility at different times in the same applied field. Thus the time-dependent character of the drift mobility can be fully delineated.