Question

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

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

Answer 1

The correct option is D All of the above

In an unbiased $\text{p - n}$ junction, diffusion of current occurs. The main reason of this phenomena are as follows-

(i) The negative charge carriers (electrons) attract the positive charge carriers(holes).

(ii) The concentration of the $\text{p -}$region and the $\text{n -}$region are the same. The concentration of holes in the $\text{p -}$region is far more than that of the $\text{n -}$region.

(iii) Because of the potential difference the holes tend to move towards the $\text{n -}$region.