Triple-Halide Wide-Band Gap Perovskites with Suppressed Phase Segregation for Efficient Tandems

Jixian Xu, Caleb C. Boyd, Zhengshan J. Yu, Axel F. Palmstrom, Daniel J. Witter, Bryon W. Larson, Ryan M. France, Jérémie Werner, Steven P. Harvey, Eli J. Wolf, William Weigand, Salman Manzoor, Maikel F.A.M. Van Hest, Joseph J. Berry, Joseph M. Luther, Zachary C. Holman, Michael D. McGehee

Research output: Contribution to journalArticlepeer-review

658 Scopus Citations


Wide-band gap metal halide perovskites are promising semiconductors to pair with silicon in tandem solar cells to pursue the goal of achieving power conversion efficiency (PCE) greater than 30% at low cost. However, wide-band gap perovskite solar cells have been fundamentally limited by photoinduced phase segregation and low open-circuit voltage. We report efficient 1.67-electron volt wide-band gap perovskite top cells using triple-halide alloys (chlorine, bromine, iodine) to tailor the band gap and stabilize the semiconductor under illumination. We show a factor of 2 increase in photocarrier lifetime and charge-carrier mobility that resulted from enhancing the solubility of chlorine by replacing some of the iodine with bromine to shrink the lattice parameter. We observed a suppression of light-induced phase segregation in films even at 100-sun illumination intensity and less than 4% degradation in semitransparent top cells after 1000 hours of maximum power point (MPP) operation at 60°C. By integrating these top cells with silicon bottom cells, we achieved a PCE of 27% in two-terminal monolithic tandems with an area of 1 square centimeter.

Original languageAmerican English
Pages (from-to)1097-1104
Number of pages8
Issue number6482
StatePublished - 2020

Bibliographical note

Publisher Copyright:
© 2020 American Association for the Advancement of Science. All rights reserved.

NREL Publication Number

  • NREL/JA-5900-75003


  • halide perovskites
  • power conversion efficiency
  • semiconductors
  • tandem solar cells


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