The first BJTs were made from germanium (Ge). Silicon (Si) types curre...
wikipedia - 02 Jun 2022The first BJTs were made from germanium (Ge). Silicon (Si) types currently predominate but certain advanced microwave and high-performance versions now employ the compound semiconductor material gallium arsenide (GaAs) and the semiconductor alloy silicon-germanium (SiGe). Single element semiconductor material (Ge and Si) is described as elemental.