Valence band
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In the band structure of a crystal, this is the energy band filled by valence electrons. In the case of insulators and semiconductors, no current flows unless the electrons in the valence band are excited beyond the energy width of the forbidden band. Semiconductors have a narrow forbidden band and are usually insulators, but when electrons in the valence band are excited and move to the conduction band to become free electrons, they behave as conductors. Filled band. Source: About Shogakukan Digital Daijisen Information | Legend |
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結晶のバンド構造における、価電子によって満たされたエネルギー帯。絶縁体と半導体の場合、禁制帯のエネルギー幅を超えて価電子帯の電子を励起しない限り、電流は流れない。半導体は禁制帯の幅が狭く、通常は絶縁体だが、価電子帯の電子が励起されて伝導帯に移って自由電子になると、導体として振る舞う。充満帯。
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