Interface and Composition Analysis on Perovskite Solar Cells

Fabio Matteocci, Yan Busby, Jean Jacques Pireaux, Giorgio Divitini, Stefania Cacovich, Caterina Ducati, Aldo Di Carlo

    Research output: Contribution to journalArticlepeer-review


    Organometal halide (hybrid) perovskite solar cells have been fabricated following four different deposition procedures and investigated in order to find correlations between the solar cell characteristics/performance and their structure and composition as determined by combining depth-resolved imaging with time-of-flight secondary ion mass spectrometry (ToF-SIMS), X-ray photoelectron spectroscopy (XPS), and analytical scanning transmission electron microscopy (STEM). The interface quality is found to be strongly affected by the perovskite deposition procedure, and in particular from the environment where the conversion of the starting precursors into the final perovskite is performed (air, nitrogen, or vacuum). The conversion efficiency of the precursors into the hybrid perovskite layer is compared between the different solar cells by looking at the ToF-SIMS intensities of the characteristic molecular fragments from the perovskite and the precursor materials. Energy dispersive X-ray spectroscopy in the STEM confirms the macroscopic ToF-SIMS findings and allows elemental mapping with nanometer resolution. Clear evidence for iodine diffusion has been observed and related to the fabrication procedure.

    Original languageEnglish
    Pages (from-to)26176-26183
    Number of pages8
    JournalACS Applied Materials and Interfaces
    Issue number47
    Publication statusPublished - 2 Dec 2015


    • EDX-STEM
    • filaments
    • perovskite solar cells
    • ToF-SIMS
    • XPS

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