Cs+ incorporation into CH3NH3PbI3 perovskite: substitution limit and stability enhancement

Ralf G. Niemann*, Laxman Gouda, Jiangang Hu, Shay Tirosh, Ronen Gottesman, Petra J. Cameron, Arie Zaban

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

96 Scopus citations


In this study we systematically explored the mixed cation perovskite Csx(CH3NH3)1-xPbI3. We exchanged the A-site cation by dipping MAPbI3 films into a CsI solution, thereby incrementally replacing the MA+ in a time-resolved dipping process and analysed the resulting thin-films with UV-Vis, XRD, EDAX, SEM and optical depth-analysis in a high-throughput fashion. Additional in situ UV-Vis and time-resolved XRD measurements allowed us to look at the kinetics of the formation process. The results showed a discontinuity during the conversion. Firstly, small amounts of Cs+ are incorporated into the structure. After a few minutes, the Cs content approaches a limit and grains of δ-CsPbI3 occur, indicating a substitution limit. We compared this cation exchange to a one-step crystallisation approach and found the same effect of phase segregation, which shows that the substitution limit is an intrinsic feature rather than a kinetic effect. Optical and structural properties changed continuously for small Cs incorporations. Larger amounts of Cs result in phase segregation. We estimate the substitution limit of CsxMA1-xPbI3 to start at a Cs ratio x = 0.13, based on combined measurements of EDAX, UV-Vis and XRD. The photovoltaic performance of the mixed cation perovskite shows a large increase in device stability from days to weeks. The initial efficiency of mixed CsxMA1-xPbI3 devices decreases slightly, which is compensated by stability after a few days.

Original languageAmerican English
Pages (from-to)17819-17827
Number of pages9
JournalJournal of Materials Chemistry A
Issue number45
StatePublished - 2016
Externally publishedYes

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry


Dive into the research topics of 'Cs+ incorporation into CH3NH3PbI3 perovskite: substitution limit and stability enhancement'. Together they form a unique fingerprint.

Cite this