Berlin 2012 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 24: Poster: Organic Semiconductors

CPP 24.10: Poster

Wednesday, March 28, 2012, 11:00–13:00, Poster A

Open-Source-Code for Numerical Drift-Diffusion Simulations of Organic Solar Cells — •Janine Fischer, Wolfgang Tress, Karl Leo, and Moritz Riede — IAPP, TU Dresden

Organic photovoltaics have recently made impressive progress by reaching efficiencies up to 10%. The versatility of the accessible materials demands for simulation tools explaining and predicting material properties that allow for a specific donator/acceptor synthesis. Numerical drift-diffusion-simulations have repeatedly shown to well reproduce experimental data and provide a powerful tool for the interpretation of measured J-V-curves. Here, we present an open-source-code for device-simulations of multilayer - bulk as well as planar heterojunction - organic solar cells. Our C++-based algorithm iteratively solves the discretized differential equation system comprising the continuity equations for electrons and holes, drift and diffusion currents, as well as the Poisson equation for space-charges caused by free charge-carriers and localized ionized dopants. In particular it also deals with non-linearities introduced by effects such as the field and/or temperature dependence of the mobility, different recombination mechanisms, or various trap distributions which can each be selected individually according to the device design. Additionally, automated parameter variations are enabled.