Current transport efficiency analysis of multijunction solar cells by luminescence imaging

  • Hao Xu
  • , Amaury Delamarre
  • , Bernice Mae F. Yu Jeco
  • , Hugh Johnson
  • , Kentaroh Watanabe
  • , Yoshitaka Okada
  • , Jean François Guillemoles
  • , Yoshiaki Nakano
  • , Masakazu Sugiyama

Research output: Contribution to journalArticlepeer-review

Abstract

Multijunction solar cells are currently leading in efficiency among all types of solar cells. However, the efficiency of those cells under concentrated illumination is limited by the trade-off between shadowing by the contact grid and series resistances. In this paper, we provide a method using luminescence to image the current transport efficiency for a precise and rapid measurement of the resistance effect. Light beam induced current (LBIC) measurement is used for the first time to calculate current transport efficiency in comparison with that of the luminescence method. Profiles of transport efficiency in both means are in good agreement. Furthermore, a quasi-3-D simulation using SPICE is used to explain the transport efficiency image. We find that the carrier transport efficiency distribution is primarily influenced by the perimeter recombination of the middle cell.

Original languageEnglish
Pages (from-to)835-843
Number of pages9
JournalProgress in Photovoltaics: Research and Applications
Volume27
Issue number10
DOIs
Publication statusPublished - 1 Oct 2019

Keywords

  • SPICE
  • current transport efficiency
  • light beam induced current
  • luminescence mapping
  • multijunction solar cell

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