1. A Gold(I) Oxide Double Perovskite: Ba2AuIO6
- Author
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Pogue, Elizabeth A., Bond, Jack, Imperato, Cassandra, Abraham, John B. S., Drichko, Natalia, and McQueen, Tyrel M.
- 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 Ba2AgIO6and Ba2NaIO6. Ba2AuIO6and Ba2AgIO6exhibit a monoclinic distortion from the cubic perovskite structure possessed by Ba2NaIO6and have similar lattice constants despite the nominally larger size of Au+compared to Ag+. Ba2AgIO6shows photoluminescence (PL) at 2.10 eV, and Ba2AuIO6exhibits 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.
- Published
- 2021
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