BaZrS3 Perovskite Defects Studied for Solar Potential

Scientists are exploring a new solar material called BaZrS3. This compound uses common elements found on Earth. It belongs to a family known as chalcogenide perovskites. These materials show promise for turning sunlight into electricity.

Unlike other similar materials, BaZrS3 does not glow brightly when exposed to light. This trait makes it tricky to study. Researchers wanted to learn more about why this happens. They focused on tiny flaws inside the material called defects.

To test this, they grew thin layers of BaZrS3 using a special machine called pulsed laser deposition. Then they heated the samples with sulfur gas. The mix of chemicals changed based on how much barium and zirconium was used. They tried different heat levels and gas amounts.

At room temperature, the material did not emit light at all. So the team cooled it down to very low temperatures. There they saw several types of light emissions. These came from both shallow and deep defects. Some emissions matched known energy levels from past studies.

The emissions appeared at specific energy values: 1.11 eV, 1.2 eV, 1.33 eV, and 1.42 eV. By changing the sulfur gas levels during growth, some defects became stronger or weaker. This shows how the making process affects the final material. Understanding these flaws could help improve solar cell designs.