Rb as an Alternative Cation for Templating Inorganic Lead-Free Perovskites for Solution Processed Photovoltaics

P. C. Harikesh, Hemant Kumar Mulmudi*, Biplab Ghosh, Teck Wee Goh, Yin Ting Teng, Krishnamoorthy Thirumal, Mark Lockrey, Klaus Weber, Teck Ming Koh, Shuzhou Li, Subodh Mhaisalkar, Nripan Mathews

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    249 Citations (Scopus)

    Abstract

    Even though perovskite solar cells have reached 22% efficiency within a very short span, the presence of lead is a major bottleneck to its commercial application. Tin and germanium based perovskites failed to be viable replacements due to the instability of their +2 oxidation states. Antimony could be a possible replacement, forming perovskites with structure A3M2X9. However, solution processing of Cs, organic ammonium based Sb perovskites result in the formation of the dimer phase with poor charge transport properties. Here we demonstrate that Rb can template the formation of the desired layered phase irrespective of processing methodologies, enabling the demonstration of efficient lead-free perovskite solar cells.

    Original languageEnglish
    Pages (from-to)7496-7504
    Number of pages9
    JournalChemistry of Materials
    Volume28
    Issue number20
    DOIs
    Publication statusPublished - 25 Oct 2016

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