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Proceedings Paper

Simulation of tandem thin-film silicon solar cells
Author(s): Christine Jandl; Wilma Dewald; Ulrich W. Paetzold; Aad Gordijn; Christoph Pflaum; Helmut Stiebig
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Paper Abstract

A sophisticated light-management is indispensable for silicon thin-film silicon solar cells based on amorphous (a-Si:H) and microcrystalline (μc-Si:H) silicon. The optical properties of thin-film solar cells have a significant influence on the conversion efficiency. The topology of the nano-textured interfaces affects the optical path and absorption. A rough transparent conductive oxide (TCO) film leads to a high quantum efficiency and shortcircuit current density. Simulations of various geometries indicate the optimal texture. Therefore, we simulate 3-dimensional tandem thin-film solar cells with different interfaces. The roughness can be identified by atomic force microscope (AFM) scans. In order to accurately analyze all aspects of the light propagation in solar cells, numerical simulations of Maxwell's equations are needed. By standard simulation programs for solving Maxwell's equations, it is difficult to simulate realistic textures of the solar cell layers. Therefore, a simulation tool based on the finite difference time domain (FDTD) method and the finite integration technique (FIT) is developed, which is able to integrate AFM scan data. To incorporate the nanostructure of a relevant section in the AFM scans, high computational domains are needed. This leads to a large number of grid points in the resulting discretization. Parallel computations on high performance computers are needed to meet the large computational requirements. The simulations show that the light propagation in the investigated thin-film device is a complex phenomenon depending on the wavelength and phase of the incident light.

Paper Details

Date Published: 18 May 2010
PDF: 8 pages
Proc. SPIE 7725, Photonics for Solar Energy Systems III, 772516 (18 May 2010); doi: 10.1117/12.854366
Show Author Affiliations
Christine Jandl, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Wilma Dewald, Fraunhofer Institute for Surface Engineering and Thin Films IST (Germany)
Ulrich W. Paetzold, Forschungszentrum Jülich GmbH (Germany)
Aad Gordijn, Forschungszentrum Jülich GmbH (Germany)
Christoph Pflaum, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Helmut Stiebig, Malibu GmbH & Co. KG (Germany)

Published in SPIE Proceedings Vol. 7725:
Photonics for Solar Energy Systems III
Ralf B. Wehrspohn; Andreas Gombert, Editor(s)

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