Bismuth telluride is a compound made of the elements bismuth and tellurium. It is known for its unique properties, particularly its ability to conduct electricity while also being a good thermoelectric material. This means it can convert temperature differences into electrical energy, making it useful in applications like cooling systems and power generation. In addition to its thermoelectric capabilities, bismuth telluride is often used in semiconductors and thermoelectric devices. Its effectiveness in these areas has made it a popular choice for researchers and engineers looking to improve energy efficiency in various technologies.