Observatorio de I+D+i UPM

Memorias de investigación
Research Publications in journals:
Analysis of the behavior of multijunction solar cells under high irradiance Gaussian light profiles showing chromatic aberration with emphasis on tunnel junction performance
Year:2015
Research Areas
  • Electronic devices,
  • Solar cells,
  • Technology of devices for engineering
Information
Abstract
In this work, we explain the behavior of multijunction solar cells under non-uniform (spatially and in spectral content) light profiles in general and in particular when Gaussian light profiles cause a photo-generated current density, which exceeds locally the peak current density of the tunnel junction. We have analyzed the implications on the tunnel junction?s limitation, that is, in the loss of efficiency due to the appearance of a dip in the I?V curve. For that, we have carried out simulations with our three-dimensional distributed model for multijunction solar cells, which contemplates a full description of the tunnel junction and also takes into account the lateral resistances in the tunnel junction. The main findings are that the current density photo-generated spreads out through the lateral resistances of the device, mainly through the tunnel junction layers and the back contact. Therefore, under non-uniform light profiles these resistances are determinant not only to avoid the tunnel junction?s limitation but also for mitigating losses in the fill factor. Therefore, taking into account these lateral resistances could be the key for jointly optimizing the concentrator photovoltaic system (concentrator optics, front grid layout and semiconductor structure)
International
Si
JCR
Si
Title
Progress in Photovoltaics
ISBN
1062-7995
Impact factor JCR
9,696
Impact info
Volume
23
10.1002/10.1002/pip.2491
Journal number
From page
743
To page
753
Month
SIN MES
Ranking
Participants
  • Autor: P- Espinet-González
  • Autor: Ignacio Rey-Stolle Prado (UPM)
  • Autor: Carlos Algora Del Valle (UPM)
  • Autor: Ivan Garcia Vara (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Semiconductores III-V
  • Departamento: Electrónica Física
  • Centro o Instituto I+D+i: Instituto de Energía Solar
S2i 2020 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)