Texturing industrial multicrystalline silicon solar cells |
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Authors: | D. H. Macdonald A. Cuevas M. J. Kerr C. Samundsett D. Ruby S. Winderbaum A. Leo |
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Affiliation: | a Department of Engineering, FEIT, Australian National University, Acton, ACT 0200, Australia;b Sandia National Laboratories, Albuquerque, NM 87185-0752, USA;c BPSolar, 2 Australia Avenue, Homebush Bay, NSW 2127, Australia |
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Abstract: | Three potential techniques for texturing commercial multicrystalline silicon solar cells are compared on the basis of reflectance measurements. Wet acidic texturing, which would be the least costly to implement, produces a modest improvement in reflection before antireflection coating and encapsulation, whereas maskless reactive-ion etching texturing, and especially masked reactive-ion etched ‘pyramids’, generate a larger gain in absorption. After antireflection coating and encapsulation however, the differences between the methods are reduced. Short-circuit current measurements on wet acidic textured cells reveal that there is a significant additional current gain above that expected from the reduced reflection. This is attributed to both light-trapping and oblique coupling of incident light into the cell, resulting in generation closer to the junction. |
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