To explain: Holes in a semiconductor and its movement when current flow through the semiconductor.
Explanation of Solution
Introduction: Electrical
In a semiconductor, when an electron jumps from filled valence electron to conduction band, an electron-vacancy is created. This vacancy with effective positive charge is called a hole. The hole appears to behave as free particle with effective positive charge.
The electrical conduction in a semiconductor is due to electron-hole pair generation. The movement of electrons in the nearly empty conduction band and of holes in a nearly full valence band underthe electric field.
When current flows through a semiconductor,the holes appear to be migrating across the material in the opposite direction to the movement of free electrons.
Conclusion: The vacancy created due to movement of electrons to valence band is called a hole, which has positive charge and takes part in flow of current.
Chapter 24 Solutions
Glencoe Physical Science 2012 Student Edition (Glencoe Science) (McGraw-Hill Education)
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