Compositional Texture Engineering for Highly Stable Wide-Bandgap Perovskite Solar Cells

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131 Scopus Citations

Abstract

The development of highly stable and efficient wide-bandgap (WBG) perovskite solar cells (PSCs) based on bromine-iodine (Br–I) mixed-halide perovskite (with Br greater than 20%) is critical to create tandem solar cells. However, issues with Br–I phase segregation under solar cell operational conditions (such as light and heat) limit the device voltage and operational stability. This challenge is often exacerbated by the ready defect formation associated with the rapid crystallization of Br-rich perovskite chemistry with antisolvent processes. We combined the rapid Br crystallization with a gentle gas-quench method to prepare highly textured columnar 1.75–electron volt Br–I mixed WBG perovskite films with reduced defect density. With this approach, we obtained 1.75–electron volt WBG PSCs with greater than 20% power conversion efficiency, approximately 1.33-volt open-circuit voltage (Voc), and excellent operational stability (less than 5% degradation over 1100 hours of operation under 1.2 sun at 65°C). When further integrated with 1.25–electron volt narrow-bandgap PSC, we obtained a 27.1% efficient, all-perovskite, two-terminal tandem device with a high Voc of 2.2 volts.

Original languageAmerican English
Pages (from-to)1295-1300
Number of pages6
JournalScience
Volume378
Issue number6626
DOIs
StatePublished - 2022

Bibliographical note

Publisher Copyright:
Copyright © 2022 the authors, some rights reserved.

NREL Publication Number

  • NREL/JA-5900-84644

Keywords

  • perovskite
  • stability
  • tandem solar cells
  • wide bandgap

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