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The role of SnF₂ additive on interface formation in all lead-free FASnI₃ perovskite solar cells

Tijdschriftbijdrage - e-publicatie

Tin-based perovskites are promising alternative absorber materials for leadfree perovskite solar cells but need strategies to avoid fast tin (Sn) oxidation. Generally, this reaction can be slowed down by the addition of tin fluoride (SnF2) to the perovskite precursor solution, which also improves the perovskite layer morphology. Here, this work analyzes the spatial distribution of the additive within formamidinium tin triiodide (FASnI(3)) films deposited on top of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) hole transporting layers. Employing time-of-flight secondary ion mass spectrometry and a combination of hard and soft X-ray photoelectron spectroscopy, it is found that Sn F2 preferably accumulates at the PEDOT:PSS/perovskite interface, accompanied by the formation of an ultrathin SnS interlayer with an effective thickness of approximate to 1.2 nm.
Tijdschrift: Advanced functional materials
ISSN: 1616-301X
Volume: 32
Pagina's: 1 - 9
Jaar van publicatie:2022
Trefwoorden:A1 Journal article
Toegankelijkheid:Open