Question

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

• A. they move across the junction by the potential difference.
  
• B. hole concentration in $p$-region is more as compared to $n$−region.
  
• C. free electrons in the $n$-region attract them.
  
• D. All the above
  

Answer 1

The correct option is B hole concentration in $p$-region is more as compared to $n$−region.


The usual tendency of the charge carriers is to disperse towards the lower concentration region from the higher concentration region. So, it can be said that in an unbiased $p-n$ junction, holes diffuse from $p$−region to the $n$−region as 𝑡he $p$−region has a greater concentration of holes than in $n$−region.

Final Answer: (𝑐)