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Reversible multicolor chromism in layered formamidinium metal halide perovskites.

Abstract：

: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 FAn+1PbnX3n+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 FAn+1PbnX3n+1 domains and adjacent FAX "reservoir" domains. Unlike traditional chromic materials that only offer a single-color transition, FAn+1PbnX3n+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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Rosales BA,Mundt LE,Allen TG,Moore DT,Prince KJ,Wolden CA,Rumbles G,Schelhas LT,Wheeler LM

doi

10.1038/s41467-020-19009-z

subject

Has Abstract

pub_date

2020-10-16 00:00:00

pages

5234

issue

1

issn

2041-1723

pii

10.1038/s41467-020-19009-z

journal_volume

11

pub_type

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