A Two-Step, All Solution Process for Conversion of Lead Sulfide to Methylammonium Lead Iodide Perovskite Thin Films

Maayan Perez, Sa'ar Shor Peled, Tzvi Templeman, Anna Osherov, Vladimir Bulovic, Eugene A. Katz, Yuval Golan

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

We present an all solution, two-step method for the production of methylammonium lead iondide (MAPbI3) perovskite thin films. Initially, PbS thin films were deposited on GaAs substrates. Subsequently, PbS films were transformed into PbI2 following treatment with polyiodide solutions. In a second conversion step, MAPbI3 films were obtained by reacting the films with methylammonium iodide solutions. The effect of the solvent on lead iodide morphology and consequently on MAPbI3 morphology was demonstrated. Conversion rate was slower with increasing solvent polarity. Optimization of conversion parameters is crucial for reproducibly obtaining continuous and adhesive perovskite films. Photoluminescence measurements showed that chemical treatments can substantially enhance light emission from the films. This route for all-solution-processed perovskites enables control over film morphology while maintaining a simple and low-cost process.

Original languageEnglish
Article number138367
JournalThin Solid Films
Volume714
DOIs
StatePublished - 30 Nov 2020

Keywords

  • Photoluminescence
  • lead sulfide
  • methylammonium lead iodide
  • microstructure
  • perovskites
  • solvent polarity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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