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Title: Device characterization for design optimization of 4 junction inverted metamorphic concentrator solar cells

Quantitative electroluminescence (EL) and luminescent coupling (LC) analysis, along with more conventional characterization techniques, are combined to completely characterize the subcell JV curves within a fourjunction (4J) inverted metamorphic solar cell (IMM). The 4J performance under arbitrary spectral conditions can be predicted from these subcell JV curves. The internal radiative efficiency (IRE) of each junction has been determined as a function of current density from the external radiative efficiency using optical modeling, but this required the accurate determination of the individual junction current densities during the EL measurement as affected by LC. These measurement and analysis techniques can be applied to any multijunction solar cell. The 4J IMM solar cell used to illustrate these techniques showed excellent junction quality as exhibited by high IRE and a one-sun AM1.5D efficiency of 36.3%. This device operates up to 1000 suns without limitations due to any of the three tunnel junctions.
Authors:
; ; ;  [1] ;  [2]
  1. National Renewable Energy Laboratory, Golden, CO 80401 (United States)
  2. National Renewable Energy Laboratory, Golden, CO 80401 USA and Instituto de Energía Solar, Universidad Politécnica de Madrid, Avda Complutense s/n, 28040 Madrid (Spain)
Publication Date:
OSTI Identifier:
22307881
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1616; Journal Issue: 1; Conference: CPV-10: 10. international conference on concentrator photovoltaic systems, Albuquerque, NM (United States), 7-9 Apr 2014; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 30 DIRECT ENERGY CONVERSION; 14 SOLAR ENERGY; CONCENTRATOR SOLAR CELLS; CONNECTORS; CURRENT DENSITY; ELECTROLUMINESCENCE; OPTICS; OPTIMIZATION; PERFORMANCE; SEMICONDUCTOR JUNCTIONS; TUNNEL EFFECT