The role of a vapor-assisted solution process on tailoring the chemical composition and morphology of mixed-halide perovskite solar cells

S. Tafazoli, N. Timasi, E. Nouri, M. R. Mohammadi (Lead / Corresponding author)

    Research output: Contribution to journalArticlepeer-review

    3 Citations (Scopus)

    Abstract

    Herein, we report a modified two-step method to construct a uniform and pinhole-free polycrystalline perovskite film with large grains up to the microscale using lead mixed-halide (PbI2-PbCl2) precursor solutions to guarantee the device functioning. Commonly used sequential deposition methods based on dip- and spin-coatings are combined with a vapor-assisted solution process to improve the perovskite morphology and tune the residual lead mixed-halides. These can enhance the optical absorption and efficiency of perovskite solar cell (PSC) devices. The impact of the Cl content in the lead mixed-halide precursors and the employed preparation methods on the photovoltaic performance of PSCs are studied. The highest performance of PSC is obtained for a vapor-treated film containing 2 mol% PbCl2 deposited by spin-coating, showing a 56% increase in photoconversion efficiency compared to the pristine PbI2-based device.

    Original languageEnglish
    Pages (from-to)4428-4435
    Number of pages8
    JournalCrystEngComm
    Volume20
    Issue number31
    Early online date5 Jul 2018
    DOIs
    Publication statusPublished - 21 Aug 2018

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