What is it about?

Light-induced halide ion "segregation" has been extensively studied under the premise that the segregation occurs within the region of illumination. This phenomenon is commonly viewed as an adverse effect for photovoltaic applications to be suppressed. Contrary to the premise, this work shows that the ion "segregation" is a non-local effect where Br ions in (FA,MA)Pb(Br0.5I0.5)3 are expelled from the illuminated region.

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Why is it important?

This work offers a completely new perspective to the ion "segregation" problem, reports a surprising finding of the oscillatory behavior of the displaced ions, and suggests an exciting potential application - a kind of battery that can be directly charged by light or solar battery cell.

Perspectives

This work opens up a new avenue for investigating the ionic motion in a solid. The detailed mechanism is still unclear, and so is its application potential.

Bissell Distinguished Professor Yong Zhang
University of North Carolina at Charlotte

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This page is a summary of: Photo-induced macro/mesoscopic scale ion displacement in mixed-halide perovskites: ring structures and ionic plasma oscillations, Light Science & Applications, September 2022, Springer Science + Business Media, DOI: 10.1038/s41377-022-00957-8.
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