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Drift and Diffusion Current Video Lecture | Modern Physics for IIT JAM

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FAQs on Drift and Diffusion Current Video Lecture - Modern Physics for IIT JAM

1. What is drift current in a semiconductor?
Ans. Drift current in a semiconductor refers to the flow of charge carriers, either electrons or holes, due to the application of an electric field. It occurs when the charge carriers experience a force from the electric field and move in a specific direction. The magnitude of the drift current depends on the mobility of the charge carriers and the strength of the electric field.
2. What is diffusion current in a semiconductor?
Ans. Diffusion current in a semiconductor occurs due to the concentration gradient of charge carriers. When there is a difference in the concentration of charge carriers, they tend to move from regions of higher concentration to regions of lower concentration, resulting in a diffusion current. Unlike drift current, diffusion current does not require an external electric field.
3. How are drift and diffusion currents related in a semiconductor?
Ans. Drift and diffusion currents are the two main components of the total current in a semiconductor. The drift current arises due to the applied electric field, while the diffusion current arises due to the concentration gradient of charge carriers. The total current is the sum of the drift and diffusion currents. In equilibrium, these two currents balance each other, resulting in no net current flow.
4. What factors affect the magnitude of drift current in a semiconductor?
Ans. The magnitude of drift current in a semiconductor is influenced by several factors. The key factors include the mobility of the charge carriers, the strength of the applied electric field, and the concentration of charge carriers. Higher mobility and stronger electric fields lead to larger drift currents, while higher charge carrier concentrations result in increased drift currents.
5. How does temperature affect drift and diffusion currents in a semiconductor?
Ans. Temperature affects drift and diffusion currents in a semiconductor through its influence on the mobility of charge carriers. As temperature increases, the mobility of charge carriers typically decreases, resulting in reduced drift currents. On the other hand, diffusion currents are directly proportional to the temperature and tend to increase with higher temperatures due to increased thermal energy.
53 videos|44 docs|15 tests
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