Titre :

Tunable Broad Light Emission from 3D “Hollow” Bromide Perovskites through Defect Engineering

Auteur(s) :

Spanopoulos, Ioannis [Auteur]
Hadar, Ido [Auteur]
Ke, Weijun [Auteur]
Guo, Peijun [Auteur]
Mozur, Eve M. [Auteur]
Morgan, Emily [Auteur]
Wang, Shuxin [Auteur]
Zheng, Ding [Auteur]
Padgaonkar, Suyog [Auteur]
Reddy, Manjunatha [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Weiss, Emily A. [Auteur]
Hersam, Mark C. [Auteur]
Seshadri, Ram [Auteur]
Schaller, Richard D. [Auteur]
Kanatzidis, Mercouri G. [Auteur]

Titre de la revue :

Journal of the American Chemical Society

Nom court de la revue :

J. Am. Chem. Soc.

Numéro :

143

Pagination :

7069-7080

Date de publication :

2021-05-12

ISSN :

0002-7863, 1520-5126

Discipline(s) HAL :

Chimie/Chimie inorganique

Résumé en anglais : [en]

Hybrid halide perovskites consisting of corner-sharing metal halide octahedra and small cuboctahedral cages filled with counter cations have proven to be prominent candidates for many high-performance optoelectronic devices. ...
Lire la suite >Hybrid halide perovskites consisting of corner-sharing metal halide octahedra and small cuboctahedral cages filled with counter cations have proven to be prominent candidates for many high-performance optoelectronic devices. The stability limits of their three-dimensional perovskite framework are defined by the size range of the cations present in the cages of the structure. In some cases, the stability of the perovskite-type structure can be extended even when the counterions violate the size and shape requirements, as is the case in the so-called “hollow” perovskites. In this work, we engineered a new family of 3D highly defective yet crystalline “hollow” bromide perovskites with general formula (FA)1–x(en)x(Pb)1–0.7x(Br)3–0.4x (FA = formamidinium (FA+), en = ethylenediammonium (en2+), x = 0–0.44). Pair distribution function analysis shed light on the local structural coherence, revealing a wide distribution of Pb–Pb distances in the crystal structure as a consequence of the Pb/Br-deficient nature and en inclusion in the lattice. By manipulating the number of Pb/Br vacancies, we finely tune the optical properties of the pristine FAPbBr3 by blue shifting the band gap from 2.20 to 2.60 eV for the x = 0.42 en sample. A most unexpected outcome was that at x> 0.33 en incorporation, the material exhibits strong broad light emission (1% photoluminescence quantum yield (PLQY)) that is maintained after exposure to air for more than a year. This is the first example of strong broad light emission from a 3D hybrid halide perovskite, demonstrating that meticulous defect engineering is an excellent tool for customizing the optical properties of these semiconductors.Lire moins >

Langue :

Anglais

Audience :

Non spécifiée

Vulgarisation :

Non

Établissement(s) :

CNRS
Centrale Lille
ENSCL
Univ. Artois
Université de Lille

Collections :

• Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Équipe(s) de recherche :

RMN et matériaux inorganiques (RM2I)

Date de dépôt :

2022-03-24T09:02:21Z
2024-01-16T17:27:19Z