Triple-Halide Bandgap Tuning in Top Cells for Perovskite/Si Tandems

Jixian Xu, Caleb Boyd, Daniel Witter, Joseph M. Luther, Michael D. McGehee

Research output: Contribution to conferencePaperpeer-review

1 Scopus Citations


We found Br/I mixed perovskite with high fraction of Cs can steadily incorporate Cl-based perovskite to tune the bandgap. The resulting films exhibit significant improvement in the mobility and lifetime of photocarriers. In 1.67eV wide-bandgap perovskite top cells optimized for perovskite/Si tandems, we achieved a great reducing of voltage-of-open-circuit (VOC) deficit from 0.57eV to 0.45eV, which is among the best of perovskite top cells in Si tandems reported so far. The stabilized PCE is improved from 17-18% to 20%, featured with high VOC (1.22V) and high FF (83%). This advance in wide-bandgap top cells holds promise for improving perovskite/Si tandems.

Original languageAmerican English
Number of pages4
StatePublished - Jun 2019
Event46th IEEE Photovoltaic Specialists Conference, PVSC 2019 - Chicago, United States
Duration: 16 Jun 201921 Jun 2019


Conference46th IEEE Photovoltaic Specialists Conference, PVSC 2019
Country/TerritoryUnited States

Bibliographical note

Publisher Copyright:
© 2019 IEEE.

NREL Publication Number

  • NREL/CP-5900-76352


  • perovskite
  • silicon
  • solar cell
  • tandem


Dive into the research topics of 'Triple-Halide Bandgap Tuning in Top Cells for Perovskite/Si Tandems'. Together they form a unique fingerprint.

Cite this