Development of Highly-Efficient GaInP/Si Tandem Solar Cells

Stephanie Essig, John F. Geisz, Myles A. Steiner, Agnes Merkle, Robby Peibst, Jan Schmidt, Rolf Brendel, Scott Ward, Daniel J. Friedman, Paul Stradins, David L. Young

Research output: Contribution to conferencePaperpeer-review

7 Scopus Citations


Dual-junction solar cells consisting of rear-heterojunction GaInP top cells and back-junction, back-contacted crystalline Si bottom cells were fabricated and characterized. Our calculations show that theoretical efficiencies up to 38.9% can be achieved with Si-based tandem devices. In our experiments, the two subcells were fabricated separately and stacked with an index matching fluid. In contrast to conventional mechanically stacked solar cells, that contain two metal grids at the interface, our concept includes a fully back contacted bottom cell which reduces the shadow losses in the device. A 1-sun AM1.5g cumulative efficiency of (26.2 ± 0.6)% has been achieved with this novel GaInP/Si 4-terminal tandem solar cell.

Original languageAmerican English
Number of pages4
StatePublished - 14 Dec 2015
Event42nd IEEE Photovoltaic Specialist Conference, PVSC 2015 - New Orleans, United States
Duration: 14 Jun 201519 Jun 2015


Conference42nd IEEE Photovoltaic Specialist Conference, PVSC 2015
Country/TerritoryUnited States
CityNew Orleans

Bibliographical note

Publisher Copyright:
© 2015 IEEE.

NREL Publication Number

  • NREL/CP-5J00-63632


  • III-V semiconductor materials
  • Multijunction solar cells
  • silicon


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