3.1.1 Semiconductor Materials l.依导电能力（电阻率p-Resistivity)不同，物体分： ◆超导体—Superconduct0s:p<10-6(cm) ◆导体一conductors:p<10-6~10-4(2cm) ◆绝缘体—Insulators:p>1010(2cm) ◆半导体-Semiconductor:p=10-4~1010(2cm) Electronic devices are constructed from Semiconductors. The most common Semiconductor material is silicon (Si); however,germanium (Ge)is sometimes used. 3.1.1 Semiconductor Materials 1.依导电能力(电阻率-Resistivity)不同, 物体分: ◆半导体—Semiconductor:  =10－4～1010(cm) ◆导体—conductors:  < 10－6～10－4(cm) ◆绝缘体—Insulators:  >1010 (cm) ◆超导体—Superconductors:  < 10－6(cm) Electronic devices are constructed from Semiconductors. The most common Semiconductor material is silicon (Si); however, germanium (Ge) is sometimes used