PbSe, or lead selenide, is a semiconductor material composed of lead and selenium. It is known for its narrow bandgap, which allows it to absorb infrared light, making it useful in applications like infrared detectors and thermophotovoltaics. This compound typically appears as a black or dark gray solid and has a cubic crystal structure. PbSe is also studied for its potential in thermoelectric devices, which convert temperature differences into electrical energy, contributing to energy efficiency and renewable energy technologies.