conduction band

https://doi.org/10.1351/goldbook.C01244
A vacant or only partially occupied set of many closely spaced electronic levels resulting from an array of a large number of atoms forming a system in which the electrons can move freely or nearly so. This term is usually used to describe the properties of metals and semiconductors.
See:
bandgap energy
,
Fermi level
,
valence band
Source:
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2233 [Terms] [Paper]