NOGUCHI Yutaka    Department   Undergraduate School  , School of Science and Technology    Position   Professor
Language	English
Publication Date	2016/10
Type	Academic Journal
Peer Review	Peer reviewed
Title	Simulation of OLEDs with a polar electron transport layer
Contribution Type	Co-authored (other than first author)
Journal	Organic Electronics
Journal Type	Another Country
Publisher	Elsevier
Volume, Issue, Page	39,pp.244-249
International coauthorship	International coauthorship
Author and coauthor	S. Altazin, S. Zuefle, E. Knapp, C. Kirsch, T. D. Schmidt, L. Jaeger, Y. Noguchi, W. Bruetting, B. Ruhstaller
Details	Organic light-emitting diodes (OLEDs) rely on the use of functional materials with suitable energy levels and mobilities for selective charge carrier injection and transport of one species only at the respective electrode. Until recently, however, the dipolar nature of many organic semiconductors has been largely ignored in this context. In particular, electron transports layers (ETLs) often exhibit spontaneous orientation polarization leading to interfacial charges that modify the electrical potential landscape inside a hetero-layer device. Here we demonstrate that the effect of polar ETLs can be simulated using the well-established Poisson and drift-diffusion formalism, if these interfacial charges are taken into account. Impedance spectroscopy is used in order to validate our approach and to characterize the polarity of the material. Finally, simulations allow to quantify the impact of polar ETLs on device performance.