Effect of Different Bromine Sources on the Dual Cation Mixed Halide Perovskite Solar Cells

Damian Głowienka (Corresponding author), Francesco Di Giacomo, Mehrdad Najafi, Ilker Dogan, Alfredo Mameli, Fallon J.M. Colberts, Jȩdrzej Szmytkowski, Yulia Galagan (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Recent research has shown that perovskite solar cells with a mixed dual A-cation have much better structural stability without loss of efficiency than single cation devices. Mixed cation perovskites create a lot of questions about the salts being used for the formation of the best-quality layer. Here, we have investigated three sources of bromide in the perovskite absorption layer, using lead bromide (PbBr2), formamidinium bromide (FABr), and cesium bromide (CsBr). The experimental results have shown better performance for FABr and CsBr sources of bromide in comparison to the regularly used PbBr2. This effect has been explained with the complex species present in the not-annealed perovskite films which changes the defect states during the crystallization of the absorber layer. It has been found with numerical simulations that the observed phenomenon directly impacts the rates of the trap-assisted recombination. The results of this study are one more step forward in understanding the physics behind the crystallization process which is crucial in further improvement of the perovskite solar cells.

Original languageEnglish
Pages (from-to)8285-8294
Number of pages10
JournalACS Applied Energy Materials
Volume3
Issue number9
DOIs
Publication statusPublished - 28 Sep 2020

Keywords

  • bromide
  • bulk recombination
  • complex species
  • perovskite
  • solar cell

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