Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HL: Fachverband Halbleiterphysik

HL 79: Photovoltaics: Mainly Silicon

HL 79.4: Vortrag

Donnerstag, 17. März 2011, 15:15–15:30, FOE Anorg

Numerical 3D-Simulation of Micromorph Silicon Thin Film Solar Cells — •Stefan Geißendörfer, Jürgen Lacombe, Karsten von Maydell, and Carsten Agert — EWE-Forschungszentrum für Energietechnologie e.V. NEXT ENERGY, Carl-von-Ossietzky-Str. 15, 26129 Oldenburg

In this contribution 3-dimensional simulations of micromorph silicon thin film solar cells, which have a tandem structure consisting of amorphous and microcrystalline subcells, will be presented. The variety of different active layers leads to a very complex structure. Additionally, randomly textured surfaces and interfaces have to be taken into account. Our goal is to create physical models to describe the coupled optical and electrical behaviour of the whole structure in three dimensions to determine the theoretical limits and dominant material parameters. To simulate solar cells with rough interfaces, the surfaces topography was measured via atomic force microscopy (AFM) and transferred to the commercial software Sentaurus TCAD from the company Synopsys. The virtual structure includes layer thicknesses and optoelectronic parameters. Results of the space resolved optical generation rates by using the optical solver "Raytracer" will be presented. The space resolved optical generation rate inside the semiconductor layers depends on the structure of the TCO interface. Therefore, regions with higher charge charrier densities can be observed which has an influence on the current transport through the stack. These investigations and the influence to the IV characteristic will be presented.