Issue 15, 2023

Molybdenum chloride double perovskites: dimensionality control of optical and magnetic properties

Abstract

Halide double perovskites are a promising class of semiconducting materials for applications in solar cells and other optoelectronic devices. Recently, there has been a surge of interest in these materials to study phenomena beyond optoelectronics, especially magnetism. Here, we report three new Mo3+ (4d3) based chloride double perovskites: a 3-D rock-salt ordered Cs2NaMoCl6, a 1-D chain (MA)2AgMoCl6 and a Dion–Jacobson type 2-D layered (1,4-BDA)2AgMoCl8 (MA = methylammonium; 1,4-BDA = 1,4-butanediammonium). Their structures and dimensionalities can be tuned by means of the A-cation. The measured bandgaps are relatively narrow (2.0–2.1 eV) which show a blueshift on reducing the dimensionality. At low temperatures, we observe antiferromagnetic coupling between the nearest-neighbour Mo3+ ions in all these systems. Cs2NaMoCl6 shows stronger coupling with a frustration index f of 5 which we attribute to the geometrically frustrating fcc lattice of Mo3+ ions. This work expands the scope of halide double perovskites beyond main group metals and beyond optoelectronics, and we hope that it will lead to future developments in magnetic halide perovskites.

Graphical abstract: Molybdenum chloride double perovskites: dimensionality control of optical and magnetic properties

Associated articles

Supplementary files

Article information

Article type
Edge Article
Submitted
09 יאַנ 2023
Accepted
03 מערץ 2023
First published
06 מערץ 2023
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2023,14, 3982-3989

Molybdenum chloride double perovskites: dimensionality control of optical and magnetic properties

D. C. Binwal, P. P. Mudoi, D. P. Panda and P. Vishnoi, Chem. Sci., 2023, 14, 3982 DOI: 10.1039/D3SC00132F

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