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A Gold(I) Oxide Double Perovskite: Ba2AuIO6.
Elizabeth A Pogue1,2, Jack Bond3, Cassandra Imperato2,4
1Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218, United States.
Journal of the American Chemical Society
|November 8, 2021
Summary
Researchers synthesized a novel gold-containing double perovskite, Ba2AuIO6, offering improved stability for optoelectronic devices. This new material exhibits near-infrared band gap properties, presenting new avenues and challenges for semiconductor development.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Optoelectronics
Background:
- Oxide perovskites demonstrate superior stability over halide perovskites for optoelectronic applications.
- The development of novel perovskite materials is crucial for advancing semiconductor technology.
Purpose of the Study:
- To report the synthesis and characterization of the first gold-containing double perovskite, Ba2AuIO6.
- To compare the structural, optical, and stability properties of Ba2AuIO6 with related compounds Ba2AgIO6 and Ba2NaIO6.
- To explore the potential of gold-containing perovskites for optoelectronic applications, particularly those requiring near-infrared band gaps.
Main Methods:
- Synthesis of double perovskite compounds: Ba2AuIO6, Ba2AgIO6, and Ba2NaIO6.
- Structural characterization using X-ray diffraction to determine crystal structure and lattice parameters.
- Optical characterization through photoluminescence (PL) spectroscopy to determine emission energies.
- Stability testing under visible light and thermal stress to assess material degradation.
Main Results:
- Ba2AuIO6 and Ba2AgIO6 exhibit monoclinic distortion, unlike the cubic Ba2NaIO6.
- Ba2AgIO6 shows photoluminescence at 2.10 eV, while Ba2AuIO6 exhibits PL at 1.30 and 1.47 eV.
- Both Ba2AuIO6 and Ba2AgIO6 decompose upon heating and illumination, likely due to -OH defects.
Conclusions:
- The discovery of Ba2AuIO6 opens a new pathway for creating semiconductors with near-infrared band gaps.
- The observed instability due to -OH defects highlights critical engineering challenges for the practical application of these oxide perovskites in optoelectronics.
- Further research is needed to mitigate defect formation and enhance the stability of these promising materials.
