Question

In an unbiased $n-p$ junction electrons diffuse from $n-$region to $p-$region because :

• A. holes in $p-$region attract them
• B. electrons travel across the junction due to potential difference
• C. electron concentration in $n-$region is more as compared to that in $p-$region
• D. only electrons move from $n$ to $p$ region and not the vice - versa

Answer 1

Answer: (C)

Electrons diffuse from $n$ to $p$ side due to concentration gradient.
Holes diffuse from $p$ to $n$ side due to the same reason.