To Exchange or Not to Exchange. Suppressing Anion Exchange in Cesium Lead Halide Perovskites with PbSO4–Oleate Capping

Vikash Kumar Ravi, Rebecca A. Scheidt, Angshuman Nag, Masaru Kuno, Prashant V. Kamat

Research output: Contribution to journalArticlepeer-review

57 Scopus citations

Abstract

The ease of halide ion exchange in metal halide nanocrystals offers an opportunity to utilize them in a layered or tandem fashion to achieve graded bandgap films. We have now successfully suppressed the halide ion exchange by capping CsPbBr3 and CsPbI3 nanocrystals with PbSO4–oleate to create a nanostructure assembly that inhibits the exchange of anions. Absorption measurements show that the nanocrystal assemblies maintain their identity as either CsPbBr3 or CsPbI3 for several days. Furthermore, the effect of PbSO4–oleate capping on the excited state dynamics has also been elucidated. The effectiveness of PbSO4–oleate capping of lead halide perovskite nanocrystals offers new opportunities to overcome the challenges of halide ion exchange and aid toward the tandem design of perovskite light-harvesting assemblies.
Original languageEnglish (US)
Pages (from-to)1049-1055
Number of pages7
JournalACS Energy Letters
Volume3
Issue number4
DOIs
StatePublished - Apr 2 2018
Externally publishedYes

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