Scanning Kelvin Probe Microscopy Reveals That Ion Motion Varies with Dimensionality in 2D Halide Perovskites

Jiang, Fangyuan; Pothoof, Justin; Muckel, Franziska; Giridharagopal, Rajiv; Wang, Jian; Ginger, David S.

doi:10.1021/acsenergylett.0c02032

Title: Scanning Kelvin Probe Microscopy Reveals That Ion Motion Varies with Dimensionality in 2D Halide Perovskites

Journal Article · Fri Dec 11 00:00:00 EST 2020 · ACS Energy Letters

DOI:https://doi.org/10.1021/acsenergylett.0c02032· OSTI ID:1779492

Jiang, Fangyuan ^[1];

^[2];

^[2]

Univ. of Washington, Seattle, WA (United States); Huazhong Univ. of Science and Technology, Wuhan (China)
Univ. of Washington, Seattle, WA (United States)

We study ion migration in 2D lead halide perovskites of varying dimensionality using scanning Kelvin probe microscopy (SKPM). We perform potentiometry on micrometer-scale lateral junctions in the absence of injected charge, and we compare how ion motion varies between prototypical two-dimensional n-butylammonium lead iodide perovskites (BA₂PbI₄, n = 1), and methylammonium-incorporated quasi-2D perovskites (BA₂MA₃Pb₄I₁₃, ~ < n > = 4) under the effects of illumination and temperature. We attribute the observed slow dynamics to relaxation of the bias-induced ionic charge distributions at different temperatures, and we extract the activation energies associated with the ionic motion in each case. Lastly, we propose an explanation for these phenomena by hypothesizing that ion motion in purely-2D BA₂PbI₄ perovskite films is dominated by paired halide and halide vacancy, whereas for quasi-2D BA₂MA₃Pb₄I₁₃ perovskites, the ion motion is a combination of both halide and methylammonium (vacancy) migration. These data show that dimensionality in these systems plays a critical role in ion dynamics.

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Research Organization:: Univ. of Washington, Seattle, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: SC0013957; ECC-1542101

OSTI ID:: 1779492

Journal Information:: ACS Energy Letters, Vol. 6, Issue 1; ISSN 2380-8195

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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