BRAINCAKESemiconductors
Semiconductors only have a small number of delocalised electrons that are able to act as charge carriers.
Many atoms close together cause the energy levels of electrons to become much wider and become energy bands.
Electrons in the valence band are tied to the atoms and not available to conduct. Electrons that have enough energy will jump to the conduction band, become delocalised and can move through the semiconductor.
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More in Electrical Quantities
- Current-Voltage Graphs
- Resistivity
- Conduction and Drift Velocity
- Resistance and Temperature
- Current-Voltage Graph for Diodes
- Current-Voltage Graph for Thermistors and LDRs
- Insulators
- Superconductivity
All 18 lessons in Electrical Quantities · All Edexcel AS-level Physics topics