Effect of Halide Composition on the Photochemical Stability of Perovskite Photovoltaic Materials

Ravi K. Misra, Laura Ciammaruchi, Sigalit Aharon, Dmitry Mogilyansky, Lioz Etgar, Iris Visoly-Fisher, Eugene A. Katz

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

The photochemical stability of encapsulated films of mixed halide perovskites with a range of MAPb(I1−xBrx)3 (MA=methylammonium) compositions (solid solutions) was investigated under accelerated stressing using concentrated sunlight. The relevance of accelerated testing to standard operational conditions of solar cells was confirmed by comparison to degradation experiments under outdoor sunlight exposure. We found that MAPbBr3 films exhibited no degradation, while MAPbI3 and mixed halide MAPb(I1−xBrx)3 films decomposed yielding crystallization of inorganic PbI2 accompanied by degradation of the perovskite solar light absorption, with faster absorption degradation in mixed halide films. The crystal coherence length was found to correlate with the stability of the films. We postulate that the introduction of Br into the mixed halide solid solution stressed its structure and induced more structural defects and/or grain boundaries compared to pure halide perovskites, which might be responsible for the accelerated degradation. Hence, the cause for accelerated degradation may be the increased defect density rather than the chemical composition of the perovskite materials.

Original languageEnglish
Pages (from-to)2572-2577
Number of pages6
JournalChemSusChem
Volume9
Issue number18
DOIs
StatePublished - 22 Sep 2016

Keywords

  • mixed halide perovskites
  • organic-inorganic hybrid composites
  • photolysis
  • photovoltaics
  • stability

ASJC Scopus subject areas

  • Environmental Chemistry
  • Chemical Engineering (all)
  • Materials Science (all)
  • Energy (all)

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