The dominant mechanism for motion of charge carriers in forward and reverse biased silicon P-N junctions are :Drift in forward bias, diffusion in reverse biasDiffusion in forward bias, drift in reverse biasDiffusion in both forward and reverse biasDrift in both forward and reverse bias
Question
The dominant mechanism for motion of charge carriers in forward and reverse biased silicon P-N junctions are :Drift in forward bias, diffusion in reverse biasDiffusion in forward bias, drift in reverse biasDiffusion in both forward and reverse biasDrift in both forward and reverse bias
Solution
The dominant mechanism for motion of charge carriers in forward and reverse biased silicon P-N junctions is: Diffusion in forward bias, drift in reverse bias.
Here's why:
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Forward Bias: In a forward bias condition, the P-N junction's P-side is connected to the positive terminal of the battery and the N-side is connected to the negative terminal. This reduces the barrier potential, allowing free electrons and holes to combine. This combination or movement is primarily due to the concentration gradient, which is a diffusion process.
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Reverse Bias: In a reverse bias condition, the P-N junction's P-side is connected to the negative terminal of the battery and the N-side is connected to the positive terminal. This increases the barrier potential, preventing the free movement of electrons and holes. However, due to thermal energy, some electrons and holes can cross the junction. This movement is against the electric field, which is a drift process.
Similar Questions
In a reverse-biased P-N junction diode, the current is primarily due to:Options :Electron flow from N to P regionHole flow from P to N regionMajority charge carriersMinority charge carriers
When a PN junction is reverse biasedOptions :Holes and electrons tend to concentrate towards the junctionThe barrier tends to break downHoles and electrons tend to move away from the junctionNone of these
Give the forward biased and reverse biased characteristics of a p-n junction diode.
Briefly explain conduction of a p-n junction diode in forward bias mode.a.Dark currents, friction, humidity and aging, enhances p and n type regions in the neutral region/depletion region until when it overcomes the potential barrier for the p-n junction to start conducting.b.Increase in pressure enhances p and n type regions in the neutral region/depletion region until when it overcomes the potential barrier for the p-n junction to start conducting.c.Increase in temperature enhances p and n type regions in the neutral region/depletion region until when it overcomes the potential barrier for the p-n junction to start conducting.d.External field enhances p and n type regions in the neutral region/depletion region until when it overcomes the potential barrier for the p-n junction to start conducting.
Which of the following is a characteristic of a reverse-biased p-n junction?a.Very low resistanceb.Large current flowc.Very narrow depletion regiond.Almost no current
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