Question
How does electric conduction take place inside a pure silicon?
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Answer
- There are two different types of charge carriers in a pure semiconductor. One is the electron and the other is the hole or absence of electron.
- Electrical conduction takes place by transportation of both carriers or any one of the two carriers in a semiconductor.
- When a semiconductor is connected in a circuit, electrons, being negatively charged, move towards positive terminal of the battery.
- Holes have an effective positive charge, and move towards negative terminal of the battery. Thus, the current through a semiconductor is carried by two types of charge carriers moving in opposite directions.
- Figure given below represents the current through a pure silicon.
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