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Reversible multicolor chromism in layered formamidinium metal halide perovskites
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Reversible multicolor chromism in layered formamidinium metal halide perovskites
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Journal Article
Reversible multicolor chromism in layered formamidinium metal halide perovskites
2020
Overview
Metal halide perovskites feature crystalline-like electronic band structures and liquid-like physical properties. The crystal–liquid duality enables optoelectronic devices with unprecedented performance and a unique opportunity to chemically manipulate the structure with low energy input. In this work, we leverage the low formation energy of metal halide perovskites to demonstrate multicolor reversible chromism. We synthesized layered Ruddlesden-Popper FA
n+1
Pb
n
X
3n+1
(FA = formamidinium, X = I, Br;
n
= number of layers = 1, 2, 3 … ∞) and reversibly tune the dimensionality (
n
) by modulating the strength and number of H-bonds in the system. H-bonding was controlled by exposure to solvent vapor (solvatochromism) or temperature change (thermochromism), which shuttles FAX salt pairs between the FA
n+1
Pb
n
X
3n+1
domains and adjacent FAX “reservoir” domains. Unlike traditional chromic materials that only offer a single-color transition, FA
n+1
Pb
n
X
3n+1
films reversibly switch between multiple colors including yellow, orange, red, brown, and white/colorless. Each colored phase exhibits distinct optoelectronic properties characteristic of 2D superlattice materials with tunable quantum well thickness.
Metal halide perovskites feature crystalline-like electronic band structures and liquid-like physical properties that allow chemical manipulation of the structure with low energy input. Here, the authors leverage the low formation energy of 2D metal halide perovskites to demonstrate films that reversibly switch between multiple colors using tunable quantum well thickness.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
