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Optimization of optical properties of graded-xAlxGa1-xAs window layers on LPE-grown GaAs solar cells

: Habermann, G.; Lutz, F.; Schetter, C.; Sulima, O.V.; Wettling, W.; Bett, A.W.

Guimaraes, L.; Palz, W.; Reyff, C. de; Kiess, H.; Helm, P.:
Eleventh E.C. Photovoltaic Solar Energy Conference '92. Proceedings : International conference, held at Montreux, Switzerland, 12 - 16 October 1992
Chur: Harwood Academic Publishers, 1993 (EUR 14811/EN)
ISBN: 3-7186-5380-X
Photovoltaic Solar Energy Conference <11, 1992, Montreux>
Fraunhofer ISE ()
III-V-Solarzellen; Fensterschicht; Flüssigphasenepitaxie; GaAs; liquid phase epitaxy; LPE; solar cell; Solarzelle; window layer

GaAs solar cells grown by the liquid phase epitaxy (LPE) etchback regrowth method were respect to their graded-x AIxGa1-xAs window layer and their antireflection coatings. In a theoretical multilayer model which makes use of the matrix transfer method with complex optical constants the graded-x layer was simulated by sublayers of different x. lt was found that graded-x layers are superior to constant-x window layers. Experimental results from various AR layer systems applied to the LPE solar cells are in good agreement with the theoretical predictions. The best solar cell of 1 x 1 square cm area showed an one-sun efficiency of 23.3 % (AM 1.5).