Cesium Enhances Long-Term Stability of Lead Bromide Perovskite-Based Solar Cells

Michael Kulbak, Satyajit Gupta, Nir Kedem, Igal Levine, Tatyana Bendikov, Gary Hodes, David Cahen

Research output: Contribution to journalArticlepeer-review

826 Scopus citations

Abstract

Direct comparison between perovskite-structured hybrid organic-inorganic methylammonium lead bromide (MAPbBr3) and all-inorganic cesium lead bromide (CsPbBr3), allows identifying possible fundamental differences in their structural, thermal and electronic characteristics. Both materials possess a similar direct optical band gap, but CsPbBr3 demonstrates a higher thermal stability than MAPbBr3. In order to compare device properties, we fabricated solar cells, with similarly synthesized MAPbBr3 or CsPbBr3, over mesoporous titania scaffolds. Both cell types demonstrated comparable photovoltaic performances under AM1.5 illumination, reaching power conversion efficiencies of ∼6% with a poly aryl amine-based derivative as hole transport material. Further analysis shows that Cs-based devices are as efficient as, and more stable than methylammonium-based ones, after aging (storing the cells for 2 weeks in a dry (relative humidity 15-20%) air atmosphere in the dark) for 2 weeks, under constant illumination (at maximum power), and under electron beam irradiation.

Original languageEnglish
Pages (from-to)167-172
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume7
Issue number1
DOIs
StatePublished - 7 Jan 2016
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015 American Chemical Society.

Keywords

  • CsPbBr
  • perovskite solar cells
  • stability

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