Question

In an unbiased p-n junction, holes diffuse from the p-region to n-region because

• A. Free electrons in the n-region attract them
• B. They move across the junction by the potential difference
• C. Hole concentrate in p-region is more as compared to n-region
• D. All the above

Answer 1

The correct option is C

Hole concentrate in p-region is more as compared to n-region

The diffusion of charge carriers across a junction takes place from the region of higher concentration to the region of lower concentration .Here the concentration of holes is more in the p-region than the n region and hence holes diffuse from the p-region to n-region..