Complex sulphides are substances with semiconductor properties. According to scientists, these substances have been around for several decades, but due to the extremely complex synthesis technology, they were not of practical use.
Researchers at the University of Tyumen have managed to improve the production methods for complex lanthanide sulphides (BaLnCuS3), the most promising group of this type of substances. The scientists have also become the world’s first to obtain BaPrCuS3 and BaSmCuS3 compounds with the new technology.
According to the scientists at the University of Tyumen, the new method is much simpler, quicker, and cheaper than other existing methods, which makes it optimal for industrial production. Due to the complicated synthesis in this type of compounds, according to the scientists, it has been quite hard even to study their crystal structure and basic physical and chemical properties.
“A number of properties we have discovered allow us to speak of great practical prospects for the new compounds. For example, they are characterised by optical anisotropy, that is, when a crystal is illuminated from different angles, the light will go through it in different ways. This makes it possible to control the light flux, which is in demand, for example, when creating photonic supercomputers”, said Nikita Azarapin, the author of the synthesis method and graduate student at the University of Tyumen’s Department of Inorganic and Physical Chemistry.
According to the University of Tyumen's researchers, the study has shown that complex sulphide semiconductor elements can be used at extremely high temperatures, up to 1,300°C, for example, in volcanic activity zones or in space under direct exposure of the sun.
The study of the obtained compounds was supported by the Kirensky Institute of Physics of SB RAS, the Federal Research Centre Krasnoyarsk Scientific Centre of the Siberian Branch of the RAS, and the Rzhanov Institute of Semiconductor Physics of the Siberian Branch of the RAS. The study also involved experts from the Indian Institute of Technology. In the future, the scientists want to continue studying the new substances’ properties.