ArticleNanoscale2026
Resolving ionic spectra of lead-halide perovskites to the nanometer.
Article in Nanoscale, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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7 authors.
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Abstract
Ionic defects play a central role in the function and dysfunction of lead-halide perovskite solar cells yet their distribution and redistribution along the heterogenous thin film is poorly-understood. This is due in part to the limited resolution of conventional optical spectroscopy methods with respect to the nanoscale grain length. Meanwhile, finer-resolution (in particular, scanning probe) methods tend to lack the spectroscopic capability to effectively discern distinct ionic contributions. Here we implement a nanoscale spectroscopic method whereby the capacitance between a conductive atomic force microscopy tip and lead-halide perovskite samples is studied as a function of excitation frequency to yield maps of local distributions of ionic defect spectra in the 100 Hz to 10 kHz regime. We utilize a nonnegative matrix factorization algorithm to disentangle linearly independent contributions to the signal and reveal, in triple-cation lead-halide perovskites, a contrast in the concentration and mobility of ionic species (i) between grains and boundaries, and (ii) between grains. We compare spectra obtained over pristine methylamonnium lead iodide microcrystals
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