CST – Computer Simulation Technology

EFFICIENT LIGHT TRAPPING SCHEME BY PERIODIC AND QUASI-RANDOM LIGHT TRAPPING STRUCTURES

Title:
EFFICIENT LIGHT TRAPPING SCHEME BY PERIODIC AND QUASI-RANDOM LIGHT TRAPPING STRUCTURES
Author(s):
Christian Haase, Uwe Rau, Helmut Stiebig
Source:
33rd IEEE Photovoltaic Specialists Conference, 2008. PVSC '08.
Vol./Issue/Date:
May 2008
Year:
2008
Page(s):
1 - 5
Keywords:
Light Trapping, Micro Crystalline Si, Optical Properties, Periodic Structure
Abstract:
Solar cells based on thin-film microcrystalline (µc-Si:H) or amorphous silicon (a-Si:H) with absorber layers in the micrometer range require highly efficient light trapping and an optimal incoupling of the entire sun spectrum. To investigate and optimize their optical properties the wave propagation in thin-film silicon solar cells is modelled in 3D solving the Maxwell equations rigorously. A periodic nanostructured texture with square based inverted pyramids is investigated as an alternative to the commonly used randomly rough texture. Different back contact designs were tested and their influence on the long wavelength light trapping was studied. A quasi-random light trapping structure that is composed of different pyramid period sizes was modelled and compared to a periodic single pyramid light trapping structure.
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