Impact of anion impurities in commercial PbI2on lead halide perovskite films and solar cells

Dimuthu C. Senevirathna, Jae Choul Yu, T. A. Nirmal Peiris, Bin Li, Monika Michalska, Hanchen Li, Jacek J. Jasieniak

Research output: Contribution to journalArticleResearchpeer-review


Batch-to-batch variability of commercial PbI2 precursors, even with metal purity levels of >99.99%, is a major limitation toward achieving intra- and interlab reproducibility of lead halide-based perovskite solar cells. This work identifies that Pb(OH)I is the primary impurity that causes these adverse issues. Through a systematic investigation into the role of synthesized Pb(OH)I within Cs0.05(FA0.85MA0.15)0.95Pb(I0.85Br0.15)3 perovskite films and solar cells, it is shown that this impurity induces segregated PbI2 and δ-FAPbI3 phases and reduces the ensuing solar cell performance characteristics. To avoid these issues, a facile, high-yield, remediation process amendable to any PbI2 precursor batch is introduced. Through its use, reliably high performing metal halide perovskite solar cells are achieved.

Original languageEnglish
Pages (from-to)351-355
Number of pages5
JournalACS Materials Letters
Issue number4
Publication statusPublished - 9 Mar 2021

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