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Published June 2011 | public
Book Section - Chapter

InAlAs epitaxial growth for wide band gap solar cells


We demonstrate high quality InAlAs epitaxial growth by metalorganic vapor phase epitaxy and wide band gap solar cell fabrication. X-ray diffraction and transmission electron microscopy were used to characterize the crystalline quality of the epitaxial InAlAs grown. InAlAs solar cells lattice-matched to InP were grown and electrically characterized under AM 1.5 global 1-sun illumination. Window layers with different composition and, therefore, band gap energies were used to compare its effect on the overall device performance. In order to improve the electrical contact at the top window (Al-rich), an InGaAs cap layer was used. The resulting first generation of InAlAs solar cells showed an efficiency higher than 14 %, open circuit voltage of V_(oc) = 1 V, J_(sc) = 19.3 mA/cm^2, and maximum external quantum efficiency of 81%.

Additional Information

© 2011 IEEE. The authors acknowledge financial support from the Department of Energy - Solar Energy Technologies Program under Grant No. DE-FG36-08GO18071. This work benefited from use of the Caltech Kavli Nanoscience Institute and the Material Science TEM facilities partially supported by the MRSEC Program of the National Science Foundation under Award Number DMR-0520565.

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October 20, 2023