HgS

Mercury sulfide (HgS), commonly known as cinnabar in its natural crystalline form, is an inorganic semiconductor compound that exists in two crystal phases with different electronic properties. Historically, HgS was the primary source of mercury metal extraction and remains significant in specialized optical and detector applications requiring narrow bandgap semiconductors, though its use is increasingly restricted due to mercury toxicity regulations. Modern interest in HgS focuses on narrow-bandgap IR detection, quantum dot synthesis for research, and specialized optoelectronic devices where its unique electronic structure offers advantages over conventional semiconductors, though engineers typically require careful handling protocols and regulatory compliance assessment before material selection.