PbSe

PbSe (lead selenide) is a narrow-bandgap IV–VI semiconductor compound with a rock-salt crystal structure, commonly produced as polycrystalline ingots or epitaxial films. It is the primary material for mid-infrared (3–5 μm) photodetectors and thermal imaging sensors operating at cryogenic to room temperature, and serves as a host lattice for quantum dots in optoelectronic research. Engineers select PbSe over alternatives like InSb or HgCdTe when cost and ease of fabrication are priorities, though it requires careful temperature management and surface passivation to control dark current and leakage; recent interest focuses on nanocrystal forms for tunable bandgap and solution-processable device architectures.