Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 64, Issue 4, Pages 393-404Publisher
ELSEVIER
DOI: 10.1016/S0927-0248(00)00253-1
Keywords
antireflection coating; multi-junction; solar weighted reflectance; herpin equivalent layers
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The success of bandgap engineering has made high-efficiency broadband multi-junction solar cells possible with photo-response out to the band edge of germanium. Modeling has been conducted which suggests that current double-layer antireflection coating technology is not adequate for these devices in certain cases. Approaches for the development of higher performance antireflection coatings are examined. A new antireflection coating structure based on the use of Herpin equivalent layers is presented. Optical modeling of the new AR coating suggests a decrease in the solar weighted reflectance of 2.5% absolute over typically used double-layer antireflection coatings. This structure requires no additional optical material development and characterization because no new optical materials are necessary. Experimental results and a sensitivity analysis are presented. (C) 2000 Elsevier Science B.V. All rights reserved.
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