Two-Terminal Metal-Inter-Connected Multijunction III-V Solar Cells

William McMahon, John Geisz, Jeffrey Carapella, Waldo Olavarria, Michelle Young, Myles Steiner, Ryan France, Alan Kibbler, Annamarie Duda, Daniel Friedman, Chieh-Ting Lin, James Ward, Emmett Perl, John Bowers

Research output: Contribution to journalArticlepeer-review

14 Scopus Citations


A novel bonding approach with an interface consisting of a metal and dielectric is developed, and a "pillar-array" metal topology is proposed for minimal optical and electrical loss at the interface. This enables a fully lattice-matched two-terminal, four-junction device that consists of an inverted top two-junction (2J) cell with 1.85-eV GaInP/1.42-eV GaAs, and an upright lower 2J cell with ~1-eV GaInAsP/0.74-eV GaInAs aimed for concentrator applications. The fabrication process and simulation of the metal topology are discussed along with the results of GaAs/GaInAs 2J and (GaInP-+-GaAs)/GaInAs three-junction bonded cells. Bonding-related issues are also addressed along with optical coupling across the bonding interface.

Original languageAmerican English
Pages (from-to)593-599
Number of pages7
JournalProgress in Photovoltaics: Research and Applications
Issue number5
StatePublished - 2015

Bibliographical note

Publisher Copyright:
Copyright © 2014 John Wiley & Sons, Ltd.

NREL Publication Number

  • NREL/JA-5J00-64528


  • concentrator photovoltaic
  • device bonding
  • III-V semiconductor
  • multijunction
  • photovoltaic cells
  • thermal compression bond


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