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FTO Darkening Rate as a Qualitative, High-Throughput Mapping Method for Screening Li-Ionic Conduction in Thin Solid Electrolytes
journal contribution
posted on 2019-12-03, 14:03 authored by Shay Tirosh, Niv Aloni, Simcha Meir, Arie Zaban, David Cahen, Diana GolodnitskyWe present a high-throughput (combinatorial) method to
screen thin ceramic films as Li-ion conductors by mapping an optical
effect of Li-ion conduction. The method, while qualitative, is fast
and simple to implement, provides a planar (XY) map of Li-ion conductivity
through different parts of the film. The effect, FTO darkening, is an optoelectrochemical one that relies on darkening of the FTO
(F-doped tin oxide) substrate, onto which the investigated film is
deposited. The rate of color change of the FTO reflects the rate of
Li-ion migration through the film. The method is validated by testing
two model systems, a Li–La–S–O film with uniform
composition and varying thickness, and a Li–La–P–O
film with varying thickness and lateral composition. The darkening
rate, obtained from optical transmission, correlates linearly with
inverse film thickness. The darkening rate map can be compared with
a resistance map obtained by impedance measurements, showing that
only Li conduction is measured. We discuss the conditions required
to distinguish between areas with pure ion conductivity and those
with mixed conductivity, the reversibility of the darkening effect
and artifacts.
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FTO Darkening RateScreening Li-Ionic Conductionresistance mapcolor changeHigh-Throughput Mapping Methodmodel systemsrate mapLi conductionimpedance measurementsLi-ion migrationmethodLi-ion conductionfilm thicknessXYion conductivityLi-ion conductorsLi-ion conductivityF-doped tin oxideuniform composition
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