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Published June 2009 | Published
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Increased cell efficiency in InGaAs thin film solar cells with dielectric and metal back reflectors


Compound single junction and multijunction solar cells enable very high photovoltaic efficiencies by virtue of employing different band gap materials in series-connected tandem cells to access the full solar spectrum. Researchers focused on improving the electrical properties of solar cells by optimizing the material growth conditions, however relatively little work to date has been devoted to light trapping and enhanced absorption in III-V compound solar cells using back reflectors. We studied absorption enhancement in InGaAs and InGaAsP thin film solar cells by means of numerical modeling. Flat dielectric and metal back reflectors that might be introduced into the solar cell via wafer-bonding, epitaxial lift-off or deposition techniques have been shown to increase the short circuit current and the photovoltaic efficiency of solar cells.

Additional Information

© 2009 IEEE. This work was supported by the Department of Energy, and the Center for Science and Engineering of Materials, an NSF Materials Research Science and Engineering Center at Caltech.

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