A Gold(I) Oxide Double Perovskite: Ba2AuIO6

Elizabeth A Pogue; Jack Bond; Cassandra Imperato; John B S Abraham; Natalia Drichko; Tyrel M McQueen

doi:10.1021/jacs.1c08241

A Gold(I) Oxide Double Perovskite: Ba₂AuIO₆

J Am Chem Soc. 2021 Nov 17;143(45):19033-19042. doi: 10.1021/jacs.1c08241. Epub 2021 Nov 8.

Authors

Elizabeth A Pogue^{1

2}, Jack Bond³, Cassandra Imperato^{2

4}, John B S Abraham⁵, Natalia Drichko^{2

4}, Tyrel M McQueen^{1

2

3

4}

Affiliations

¹ Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218, United States.
² Institute for Quantum Matter, The Johns Hopkins University, Baltimore, Maryland 21218, United States.
³ Department of Materials Science and Engineering, The Johns Hopkins University, Baltimore, Maryland 21218, United States.
⁴ Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, United States.
⁵ Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland 20723, United States.

PMID: 34748316
DOI: 10.1021/jacs.1c08241

Abstract

Oxide perovskites offer improved stability compared to halide perovskite compounds for optoelectronic applications. Here, we report the first gold-containing double perovskite, Ba₂AuIO₆, and compare it to Ba₂AgIO₆ and Ba₂NaIO₆. Ba₂AuIO₆ and Ba₂AgIO₆ exhibit a monoclinic distortion from the cubic perovskite structure possessed by Ba₂NaIO₆ and have similar lattice constants despite the nominally larger size of Au⁺ compared to Ag⁺. Ba₂AgIO₆ shows photoluminescence (PL) at 2.10 eV, and Ba₂AuIO₆ exhibits PL at 1.30 and 1.47 eV. As prepared, both compounds appear stable under visible light at room temperature but decompose when subjected to gentle heating followed by illumination. Our data suggest that this behavior is due to the presence of -OH defects in the crystal structures. This discovery provides a new route to semiconductors with a near-IR band gap and identifies engineering challenges that must be addressed to use oxide perovskites for optoelectronic devices.