In Situ Investigation of Halide Incorporation into Perovskite Solar Cells

Mengjin Yang, Mowafak Al-Jassim, Kai Zhu, Joseph Berry, Jeffery Aguiar, Nooraldeen Alkurd, Sarah Wozny, Maulik Patel, Weilie Zhou, Terry Holesinger

Research output: Contribution to journalArticlepeer-review

6 Scopus Citations


Here we report on the material chemistry following crystallization in the presence of water vapor of chlorinated formamidinium lead-triiodide (NH2CH = NH2PbI3-xClx) perovskite films. We found in-situ exposure to water vapor reduces, or possibly eliminates, the retention of chlorine (Cl) inside NH2CH = NH2PbI3-xClx crystals. There is a strong tendency toward Cl volatility, which indicates the sensitivity of these materials for their integration into solar cells. The requisite for additional efforts focused on the mitigation of water vapor is reported. Based on the in situ results, hot casting (<100 °C) in dry conditions demonstrates improved film coverage and Cl retention with efficiencies reaching 12.07%.

Original languageAmerican English
Pages (from-to)575-582
Number of pages8
JournalMRS Communications
Issue number3
StatePublished - 1 Sep 2017

Bibliographical note

Publisher Copyright:
© 2017 Materials Research Society.

NREL Publication Number

  • NREL/JA-5K00-68970


  • dry condition
  • film coverage
  • perovskite
  • perovskite solar cells
  • water vapor


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