Passivation Properties and Formation Mechanism of Amorphous Halide Perovskite Thin Films

Susan A. Rigter, Xueying L. Quinn, Rishi E. Kumar, David P. Fenning, Philippe Massonnet, Shane R. Ellis, Ron M.A. Heeren, Katrine L. Svane, Aron Walsh, Erik C. Garnett

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Lead halide perovskites are among the most exciting classes of optoelectronic materials due to their unique ability to form high-quality crystals with tunable bandgaps in the visible and near-infrared using simple solution precipitation reactions. This facile crystallization is driven by their ionic nature; just as with other salts, it is challenging to form amorphous halide perovskites, particularly in thin-film form where they can most easily be studied. Here, rapid desolvation promoted by the addition of acetate precursors is shown as a general method for making amorphous lead halide perovskite films with a wide variety of compositions, including those using common organic cations (methylammonium and formamidinium) and anions (bromide and iodide). By controlling the amount of acetate, it is possible to tune from fully crystalline to fully amorphous films, with an interesting intermediate state consisting of crystalline islands embedded in an amorphous matrix. The amorphous lead halide perovskite has a large and tunable optical bandgap. It improves the photoluminescence quantum yield and lifetime of incorporated crystalline perovskite, opening up the intriguing possibility of using amorphous perovskite as a passivating contact, as is currently done in record efficiency silicon solar cells.

Original languageEnglish
Article number2010330
JournalAdvanced Functional Materials
Issue number15
StatePublished - 8 Apr 2021

Bibliographical note

Publisher Copyright:
© 2021 The Authors. Advanced Functional Materials published by Wiley-VCH GmbH


  • amorphous films
  • chemical analysis
  • crystallization
  • halide perovskite
  • nucleation
  • photoluminescence


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