Chloride-Based Additive Engineering for Efficient and Stable Wide-Bandgap Perovskite Solar Cells

Xinyi Shen, Benjamin M. Gallant, Philippe Holzhey, Joel A. Smith, Karim A. Elmestekawy, Zhongcheng Yuan, P.V.G.M. Rathnayake, Stefano Bernardi, Akash Dasgupta, Ernestas Kasparavicius, Tadas Malinauskas, Pietro Caprioglio, Oleksandra Shargaieva, Yen-Hung Lin, Melissa M. McCarthy, Eva Unger, Vytautas Getautis, Asaph Widner-Cooper, Laura M. Herz, Henry J. Snaith*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Metal halide perovskite based tandem solar cells are promising to achieve power conversion efficiency beyond the theoretical limit of their single-junction counterparts. However, overcoming the significant open-circuit voltage deficit present in wide-bandgap perovskite solar cells remains a major hurdle for realizing efficient and stable perovskite tandem cells. Here, a holistic approach to overcoming challenges in 1.8 eV perovskite solar cells is reported by engineering the perovskite crystallization pathway by means of chloride additives. In conjunction with employing a self-assembled monolayer as the hole-transport layer, an open-circuit voltage of 1.25 V and a power conversion efficiency of 17.0% are achieved. The key role of methylammonium chloride addition is elucidated in facilitating the growth of a chloride-rich intermediate phase that directs crystallization of the desired cubic perovskite phase and induces more effective halide homogenization. The as-formed 1.8 eV perovskite demonstrates suppressed halide segregation and improved optoelectronic properties.
Original languageEnglish
Article number2211742
Number of pages11
JournalAdvanced Materials
Volume35
Issue number30
Early online date16 May 2023
DOIs
Publication statusPublished - Jul 2023

Keywords

  • additive engineering
  • crystallization mechanism
  • halide homogenization
  • perovskite solar cells
  • suppressed halide segregation

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