Germanium (Ge)

Germanium is a brittle semiconductor element with a crystal structure similar to silicon, used primarily in optoelectronic and infrared applications where its narrow bandgap provides advantages over silicon. It is employed in infrared detectors, thermal imaging systems, fiber-optic communications, and specialized photovoltaic cells, particularly in multi-junction solar panels for space and concentrator photovoltaic systems. Engineers select germanium when sensitivity to longer infrared wavelengths, high-frequency signal detection, or radiation hardness in space environments is critical, though its higher cost and lower thermal stability compared to silicon limit it to niche, performance-critical applications.