10.1021/acscombsci.9b00099.s002
Shay Tirosh
Shay
Tirosh
Niv Aloni
Niv
Aloni
Simcha Meir
Simcha
Meir
Arie Zaban
Arie
Zaban
David Cahen
David
Cahen
Diana Golodnitsky
Diana
Golodnitsky
FTO Darkening
Rate as a Qualitative, High-Throughput Mapping Method for Screening
Li-Ionic Conduction in Thin Solid Electrolytes
American Chemical Society
2019
FTO Darkening Rate
Screening Li-Ionic Conduction
resistance map
color change
High-Throughput Mapping Method
model systems
rate map
Li conduction
impedance measurements
Li-ion migration
method
Li-ion conduction
film thickness
XY
ion conductivity
Li-ion conductors
Li-ion conductivity
F-doped tin oxide
uniform composition
2019-12-03 14:03:46
Journal contribution
https://acs.figshare.com/articles/journal_contribution/FTO_Darkening_Rate_as_a_Qualitative_High-Throughput_Mapping_Method_for_Screening_Li-Ionic_Conduction_in_Thin_Solid_Electrolytes/11310143
We 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, <i>FTO darkening</i>, 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.