Dresden 2009 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 23: Electronic and Optical Properties

CPP 23.7: Talk

Wednesday, March 25, 2009, 15:45–16:00, ZEU 114

Advanced Simulation Methods for Charge Transport in OLEDs — •Evelyne Huber, Hansueli Schwarzenbach, Roger Häusermann, Nils A. Reinke, and Beat Ruhstaller — Zurich University of Applied Science, Institute of Computational Physics, Wildbachstrasse 21, 8401 Winterthur, Switzerland

Until now the system of equations for organic semiconductor device modelling has been predominantly solved in a decoupled way with the Gummel algorithm which can suffer from slow convergence. This limits the use of fitting algorithms for parameter extraction and sweeping. For the design of OLED it is of crucial importance to solve the involved equations efficiently on a PC. OLED simulation requires solving the continuity equations for electrons and holes and the Poisson equation in one dimension. The resulting system of equations is strongly coupled. Introducing disorder and novel mobility models for organic materials leads to highly nonlinear equations. In this study we present OLED simulations where the coupled equations are solved with the Newton algorithm. We combine this method with advanced physical transport models such as Gaussian disorder, density- and field-dependent mobilities and generalized Einstein diffusion. The performance of the presented algorithms is compared.