For semiconductors, the two important bands are the valence band, which is the highest band containing electrons, and the empty conduction band just above it, in which electrons can flow freely.

• 半导体里最重要的两个能带是价带跟导带，价带是所有填满电子的能带里能量最高的，导带就在价带上方，里头空空的没什麽电子，所以电子在价带中可以自由流动。