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Title: Advances on multijunction solar cell characterization aimed at the optimization of real concentrator performance

Multijunction solar cells (MJSC) are usually developed to maximize efficiency under test conditions and not under real operation. This is the case of anti-reflective coatings (ARC), which are meant to minimize Fresnel reflection losses for a family of incident rays at room temperature. In order to understand and quantify the discrepancies between test and operation conditions, we have experimentally analyzed the spectral response of MJSC for a variety of incidence angles that are in practice received by a concentrator cell in high-concentration photovoltaic (HCPV) receiver designs. Moreover, we characterize this angular dependence as a function of temperature in order to reproduce real operation conditions. As the refractive index of the silicone is dependent on temperature, an optical mismatch is expected. Regarding other characterization techniques, a method called Relative EL Homogeneity Analysis (RELHA) is applied to processed wafers prior to dicing, allowing to diagnose the wafer crystalline homogeneity for each junction. Finally, current (I)-voltage (V) characterization under strongly unbalanced light spectra has also been carried out for a number of low-level irradiances, providing insight on each junction shunt resistance and corresponding radiative coupling.
Authors:
; ; ; ;  [1]
  1. CEA-LITEN, LCPV, INES, Le Bourget du Lac (France)
Publication Date:
OSTI Identifier:
22307880
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:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 14 SOLAR ENERGY; ELECTRIC CONDUCTIVITY; ENERGY EFFICIENCY; INCIDENCE ANGLE; PHOTOVOLTAIC EFFECT; RADIANT FLUX DENSITY; REFLECTION; REFLECTIVE COATINGS; REFRACTIVE INDEX; SEMICONDUCTOR JUNCTIONS; SILICONES; SOLAR CELLS; SPECTRAL RESPONSE; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0273-0400 K; VISIBLE RADIATION