Question 3: On the energy band diagram, electron energy is measured upwards. Explain why
hole energy is measured downwards.
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Due to the difference in applied electric potential.
Explanation:
- By definition, energy band diagrams represent the variation in electron energy and also their position.
- The respective energy levels are Ec and Ev.
- When a positive voltage is applied in a material, it gives rise to an electric field.
- This electric field pulls the electrons and upsets the position of energy bands.
- The conduction band "Ec" moves towards the Fermi level in an upward direction.
- while holes carry negative charges and their potential moves downward.
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