Question:
The movement of charge carriers due to charge carrier concentration gradient is called ________.
The movement of charge carriers due to charge carrier concentration gradient is called ________.
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Diffusion current is caused by carrier concentration gradient, while drift current is due to electric field. Watch the source!
Updated On: Jun 23, 2025
- Drift current
- Displacement current
- Diffusion current
- Photo current
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The Correct Option is C
Solution and Explanation
Step 1: Define Diffusion
Diffusion is the process by which particles move from high concentration to low concentration.
Step 2: Apply to semiconductors
In semiconductors, when there is a non-uniform concentration of charge carriers (electrons or holes), carriers move due to concentration gradient.
Step 3: Define diffusion current
This movement of charge carriers (not due to electric field) causes a current called diffusion current. It arises in PN junctions, especially near depletion regions.
Step 4: Contrast with drift current
- Drift current: Caused by electric field.
- Diffusion current: Caused by concentration gradient.
Hence, \[ \boxed{\text{Diffusion current}} \]
Diffusion is the process by which particles move from high concentration to low concentration.
Step 2: Apply to semiconductors
In semiconductors, when there is a non-uniform concentration of charge carriers (electrons or holes), carriers move due to concentration gradient.
Step 3: Define diffusion current
This movement of charge carriers (not due to electric field) causes a current called diffusion current. It arises in PN junctions, especially near depletion regions.
Step 4: Contrast with drift current
- Drift current: Caused by electric field.
- Diffusion current: Caused by concentration gradient.
Hence, \[ \boxed{\text{Diffusion current}} \]
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