Anomalous transport properties in disordered organic layers

• Published in: Journal of non-crystalline solids 1983-01, Vol.55 (2), p.215-219
• Main Authors: Ziók̵owska-Pawlak, B, Mycielski, W, Lipiński, A
• Format: Article
• Language: English
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/0022-3093(83)90671-3

The results of time-of-flight experiments for two different organic compounds, copper phthalocyanine and tetracene layers, are presented. These materials were investigated in the form of vacuum evaporated layers in which, as is known, transport phenomena are more complicated in comparison with those in monocrystals. The current-time profile observed for both materials was highly dispersive as judged by the phenomenological theory of stochastic hopping or multiple-trapping processes. The differences between theoretical prediction and experimental data are demonstrated, first of all, in the field dependence of the disorder parameters α 1 and α 2 for the initial and final parts of the log i versus log t plots, respectively. The results are compared with the experimental data for other materials, as well as with the results of numerical computations given by other authors.