the lower energy band in a semiconductor that is completely filled with electrons at 0 K; electrons cannot conduct in valence band.
a band of allowed energy states that exists in solids and is completely filled with electrons at zero degrees kelvin. The valence band is separted from the conduction band by an energy gap in insulators and most semiconductors and overalps the conduction band in metals.
The energy levels of the electrons in he outermost shell of the atoms making up a solid material.
The highest energy band in a semiconductor that can be filled with electrons.