Three-Step Sequential Solution Deposition of PbI2-Free CH3NH3PbI3 Perovskite

Kai Zhu, Yixin Zhao

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99 Scopus Citations


We demonstrate a three-step sequential solution process to prepare PbI2-free CH3NH3PbI3 perovskite films. In this three-step method, a thermally unstable stoichiometric PbI2·CH3NH3Cl precursor film is first deposited on the mesoporous TiO2 substrate, followed by thermal decomposition to form PbI2, which is finally converted into CH3NH3PbI3 by dipping in a regular isopropanol solution of CH3NH3I at room temperature. In comparison to the two-step approach using similar processing conditions, the three-step method enables the formation of the PbI2 film through the thermal decomposition of the PbI2·CH3NH3Cl precursor film. This facilitates a rapid conversion of PbI2 to CH3NH3PbI3 without any traceable residue PbI2 in the final conversion step, leading to an improved device performance.

Original languageAmerican English
Pages (from-to)9086-9091
Number of pages6
JournalJournal of Materials Chemistry A
Issue number17
StatePublished - 2015

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry 2015.

NREL Publication Number

  • NREL/JA-5900-63010


  • perovskite solar cells
  • sequential solution deposition


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