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Title: Improving optical performance of concentrator cells by means of a deposited nanopattern layer

Multijunction solar cells (MJSC) use anti-reflective coatings (ARC) to minimize Fresnel reflection losses for a family of light incidence angles. These coatings adapt the refractive index of the cell to that of the surrounding medium. Patterns with sizes in the range of the light wavelength can be used to further reduce reflections through diffraction. Transparent nanopatterns with a gradual profile, called moth-eye nanostructures, can adapt the refractive index of the optical interfaces (often with n∼1.5) used to encapsulate concentrator solar cells to that of the air (n{sub air}∼1). Here we show the effect of a nanometric moth-eye ARC with a round motif deposited on commercial MJSC that achieves short-circuit current (I{sub SC}) gains greater than 2% at normal incidence and even higher in the case of tilted illumination. In this work, MJSC with different moth-eye ARC are characterized under quantum efficiency (QE) as well as under concentrated illumination I-V in order to assess their potential. Simulations based on coupled wave analysis (RCWA) are used to fit the experimental results with successful results.
Authors:
; ; ;  [1] ;  [1] ;  [2] ;  [3] ; ;  [4]
  1. CEA-LITEN, Laboratoire de Photovoltaïque à Concentration, INES, Le Bourget du Lac (France)
  2. (Spain)
  3. CEA-LITEN, Laboratoire de Surfaces Nanostructurées, Grenoble (France)
  4. Laboratoire Hubert Curien UMR CNRS, Université de Lyon, St. Etienne (France)
Publication Date:
OSTI Identifier:
22489009
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1679; Journal Issue: 1; Conference: CPV-11: 11. international conference on conventrator photovoltaictaic systems, Aix-les-Bains (France), 13-15 Apr 2015; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 14 SOLAR ENERGY; CONCENTRATOR SOLAR CELLS; DIFFRACTION; ELECTRIC CONDUCTIVITY; GAIN; ILLUMINANCE; INCIDENCE ANGLE; LAYERS; NANOSTRUCTURES; PERFORMANCE; QUANTUM EFFICIENCY; REFLECTION; REFLECTIVE COATINGS; REFRACTIVE INDEX; VISIBLE RADIATION