Trapezoidal Grid Fingers to Reduce Shadowing Loss and Improve Short Circuit Current

Alessandro Cavalli, Jeronimo Buencuerpo, Mark Steger, Emmett Perl, Myles Steiner, John Geisz

Research output: Contribution to journalArticlepeer-review

1 Scopus Citations


Traditional metallic contacts on solar cells can cover a substantial portion of the device area, resulting in shadowing of light that diminishes the amount of current collected. In this paper, we developed trapezoidal electron-beam evaporated Ti/Al front grid fingers on GaAs single-junction solar cells to decrease the optical shadowing and increase the photogenerated current. We observe a high fill factor of 87% at 1-Sun light intensity and we observe no degradation on the open-circuit voltage. The short-circuit current density is found to increase by 0.4 mA/cm2 when compared to previously demonstrated electroplated Ni/Au front grid fingers, resulting in an efficiency improvement of ~0.8% absolute.

Original languageAmerican English
Article numberArticle No. 111294
Number of pages6
JournalSolar Energy Materials and Solar Cells
StatePublished - Oct 2021

Bibliographical note

Publisher Copyright:
© 2021 Elsevier B.V.

NREL Publication Number

  • NREL/JA-5900-80576


  • Front grid fingers
  • III-V Materials
  • Metallization
  • Solar cells


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