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Effect of non-uniformity on concentrator multi-junction solar cells equipped with refractive secondary optics under shading conditions

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  • Saura, José M.
  • Chemisana, Daniel
  • Rodrigo, Pedro M.
  • Almonacid, Florencia M.
  • Fernández, Eduardo F.

Abstract

Non-uniformity is a relevant concern of concentrator photovoltaic systems (CPV) due to its impact on the performance of multi-junction (MJ) solar cells. This work is focused on a state-of-the-art investigation related to the effects of shading on the irradiance profiles and electrical performance of MJ cells. For doing this, three different CPV single-units with a concentration of ≈559x have been experimentally investigated indoors at the CPV laboratory of the University of Jaén. The units are made up of poly(methyl methacrylate) (PMMA) Fresnel lens and standard GaInP/GaInAs/Ge MJ cells. Also, single-lens-optical element (SILO-Pyramid) and refractive truncated pyramid (RTP) homogenizers have been considered. The results indicate that shading produces additional spatial and spectral non-uniformities, and that these are reduced by the use of homogenizers. In addition, the non-uniform spectral illumination has been identified as the main cause of the additional reduction of the performance of MJ solar cells. In this sense, the SILO-Pyramid provides the best results and shows a significantly stable spectral performance under shading conditions. For a no-homogenizer case, the maximum power shows a reduction of 86.3% for a shading factor of 80%, while it is only reduced by 83.2% and by 81.6%, respectively, for the RTP and SILO-Pyramid.

Suggested Citation

  • Saura, José M. & Chemisana, Daniel & Rodrigo, Pedro M. & Almonacid, Florencia M. & Fernández, Eduardo F., 2022. "Effect of non-uniformity on concentrator multi-junction solar cells equipped with refractive secondary optics under shading conditions," Energy, Elsevier, vol. 238(PC).
    • Handle: RePEc:eee:energy:v:238:y:2022:i:pc:s0360544221022921
    DOI: 10.1016/j.energy.2021.122044
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    References listed on IDEAS

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