Nanometer- and Micrometer-Scale Texturing for High-Efficiency Micromorph Thin-Film Silicon Solar Cells

Optimized transparent conductive oxide front electrodes are vital to further increase the efficiency of thin-film silicon solar devices. We report details on the fabrication of multiscale textured zinc oxide substrates and their implementation in amorphous silicon/microcrystalline silicon tandem (micromorph) devices. Such substrates allow separate optimization of light trapping in the top and bottom cells, and efficient decoupling of transparency and conduction.We show in particular the need for sharp, nanoscale texturing for antireflection and light trapping in the top cell.We also show that smooth, micrometer-scale texturing can efficiently improve large-wavelength light management without degrading the quality of the silicon material grown on the substrate. By combining the appropriate morphologies, high currents can be reached in both the top and bottom subcells, while conserving the optimal electrical properties of the solar cells.


Published in:
IEEE Journal of Photovoltaics
Year:
2011
ISSN:
2156-3403
Note:
IMT-NE Number: 632
Laboratories:


Note: The status of this file is: Involved Laboratories Only


 Record created 2012-02-08, last modified 2018-03-17

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