PbTe

PbTe (lead telluride) is an IV-VI narrow-bandgap semiconductor compound commonly used in thermoelectric devices and infrared detectors. It is valued for its ability to convert heat directly into electrical current and to detect infrared radiation, making it critical in waste-heat recovery systems, space-based instruments, and thermal imaging applications where traditional semiconductors fall short. Engineers select PbTe over alternatives like Bi₂Te₃ when operating temperatures exceed ~500 K or when infrared sensitivity in the mid-wave band is required, though its toxicity and lower mechanical robustness necessitate careful integration and encapsulation.