Berlin 2008 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 12: Photovoltaic
HL 12.6: Vortrag
Montag, 25. Februar 2008, 15:15–15:30, EW 202
Angle dependent optics in nano-textured thin-film silicon solar cells — •Rahul Dewan1, Christian Haase2, Helmut Stiebig2, and Dietmar Knipp1 — 1School of Engineering and Science, Jacobs University Bremen, D-28759 Bremen, Germany — 2Institute of Photovoltaics, Research Center Jülich, D-52425 Jülich, Germany
Highly effective light trapping and optical light incoupling concepts are essential in realizing highly efficient thin-film solar cells with absorbers in the range of micrometers. To investigate and optimize both effects, wave propagation in thin-film silicon solar cells with integrated grating couplers was modeled in two and three dimensions solving the Maxwell equations by a Finite Difference Time Domain approach. Simulations were carried out for different wavelengths and angles of incidence of light, keeping the period of the grating structure fixed. Simulation results reveal that for small angles of incidence (close to normal incidence) the absorption of the solar cells with integrated couplers is enhanced in comparison to structures without grating couplers. Such behavior is observed for shorter and longer wavelengths (500 nm and 800 nm). For intermediate angles of incidence (30° - 60°) the absorption of the structures without grating couplers exceeds the absorption attained for structures with integrated couplers. As the wavelength of the incident light increases from 500 nm to 800 nm for structures without couplers, the maxima of the absorption shifts from 60° to 40° angle of incidence. Structures with and without grating couplers exhibit similar absorption behavior for angles of incidence larger than 75°.