Used in thermoelectric devices to convert waste heat into electricity, especially in deep-space missions and remote power systems due to its high efficiency at elevated temperatures. Also employed in infrared detectors and optoelectronic applications, such as laser diodes and photodetectors, operating in the mid-infrared range. Its narrow bandgap makes it suitable for sensing and imaging in thermal detection systems. Additionally, lead telluride is researched in nanoscale form to enhance thermoelectric performance for energy harvesting and solid-state cooling.