Verified Solution • 2025–26 Session moderate

QPages 419-421: Q19: HC Verma: Concepts of Physics - Volume 2 Semiconductors and Semiconductor Devices Pages 419-421: Q19 Solution: When a p-n junction is reverse-biased, the current becomes…

When a p-n junction is reverse-biased, the current becomes almost constant at 25 �A. When it is forward-biased at 200 mV, a current of 75 �A is obtained. Find the magnitude of diffusion current when the diode is a) unbiased, b) reverse-biased at 200 mV and c) forward-biased at 200 mV.

Step-by-Step Verified Solution

**Answer:** (a) 25 _A (b) 25 _A (c) 100 _A. **Step-by-Step Explanation:** Given: Reverse saturation current = 25 _A. Forward current at 200 mV = 75 _A. (a) Unbiased: net current = 0, but diffusion current = drift current = 25 _A. (b) Reverse-biased at 200 mV: current = 25 _A. (c) Forward-biased at 200 mV: current = 75 _A. Standard: 100 _A .

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