Experimental coupling process efficiency and benefits of back surface reflectors in photovoltaic multi-junction photonic power converters

López Estrada, Esther and Höhn, Oliver and Schauerte, Meike and Lackner, David and Schachtner, Michael and Reichmuth, S. Kasimir and Helmers, Henning (2021). Experimental coupling process efficiency and benefits of back surface reflectors in photovoltaic multi-junction photonic power converters. "Progress in Photovoltaics: Research and Applications", v. n/a (n. n/a); pp. 1-10. ISSN 1062-7995. https://doi.org/10.1002/pip.3391.

Description

Title: Experimental coupling process efficiency and benefits of back surface reflectors in photovoltaic multi-junction photonic power converters
Author/s:
  • López Estrada, Esther
  • Höhn, Oliver
  • Schauerte, Meike
  • Lackner, David
  • Schachtner, Michael
  • Reichmuth, S. Kasimir
  • Helmers, Henning
Item Type: Article
Título de Revista/Publicación: Progress in Photovoltaics: Research and Applications
Date: January 2021
ISSN: 1062-7995
Volume: n/a
Subjects:
Freetext Keywords: photonic power converter, laser power converter, III-V multi-junction cell, current mismatch, temperature dependence, luminescence coupling, back surface reflector
Faculty: Instituto de Energía Solar (IES) (UPM)
Department: Electrónica Física, Ingeniería Eléctrica y Física Aplicada
UPM's Research Group: Silicio y Nuevos Conceptos para Células Solares
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Current matching is crucial to maximize the efficiency of two‐terminal multi‐junction photovoltaic devices. However, even in perfectly designed devices, deviation from the target operating temperature and consequent changes in the subcell absorptances causes current mismatch between the subcell currents even at constant spectral conditions. Fortunately, luminescence coupling from current‐overproducing subcells to current limiting subcells mitigates this effect. In this work, the coupling process efficiency in three‐junction photonic power converters based on GaAs/AlGaAs rear hetero‐junction subcells is experimentally quantified. A coupling process efficiency of 32% ± 9% from top and middle subcells to the limiting bottom subcell is found. Under constant monochromatic illumination, the observed coupling reduces the current mismatch, induced by raising the temperature from current matched conditions at 25°C to 70°C, from 4.4% to 1.6%. Furthermore, in this work, three‐junction photonic power converters with back surface reflectors are implemented. Those reflectors improve the device response at elevated temperatures by increasing the optical path length in the limiting subcell. It is shown experimentally how a back reflector effectively redirects photons that are emitted by the bottom subcell towards the upper subcells to reinforce luminescence coupling.

Funding Projects

TypeCodeAcronymLeaderTitle
Madrid Regional Government2019-T2/AMB-12959UnspecifiedUnspecifiedUnspecified

More information

Item ID: 66269
DC Identifier: https://oa.upm.es/66269/
OAI Identifier: oai:oa.upm.es:66269
DOI: 10.1002/pip.3391
Official URL: https://onlinelibrary.wiley.com/doi/10.1002/pip.3391
Deposited by: Dr. Esther López Estrada
Deposited on: 05 Mar 2021 10:10
Last Modified: 05 Mar 2021 10:10
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