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Title: Reduction of front-metallization grid shading in concentrator cells through laser micro-grooved cover glass

Concentrator solar cell front-grid metallizations are designed so that the trade-off between series resistance and shading factor (SF) is optimized for a particular irradiance. High concentrator photovoltaics (CPV) typically requires a metallic electrode pattern that covers up to 10% of the cell surface. The shading effect produced by this front electrode results in a significant reduction in short-circuit current (I{sub SC}) and hence, in a significant efficiency loss. In this work we present a cover glass (originally meant to protect the cell surface) that is laser-grooved with a micrometric pattern that redirects the incident solar light towards interfinger regions and away from the metallic electrodes, where they would be wasted in terms of photovoltaic generation. Quantum efficiency (QE) and current (I)-voltage (V) characterization under concentration validate the proof-of-concept, showing great potential for CPV applications.
Authors:
; ; ;  [1] ;  [1] ;  [2] ; ;  [3]
  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)
Publication Date:
OSTI Identifier:
22489014
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:
14 SOLAR ENERGY; ABUNDANCE; CONCENTRATION RATIO; CONCENTRATOR SOLAR CELLS; DESIGN; ELECTRIC CONDUCTIVITY; ELECTRICAL FAULTS; GLASS; GRIDS; LASERS; PHOTOVOLTAIC EFFECT; QUANTUM EFFICIENCY; RADIANT FLUX DENSITY; REDUCTION; SURFACES; VISIBLE RADIATION