Question

In an unbiased \( p\)-\( n \) 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. only electrons move from \( n\)-region to \( p\)-region and not the vice-versa
• D. electron concentration in \( n\)-region is more compared to that in \( p\)-region

Hint:

In an unbiased \( p\)-\( n \) junction, the concentration gradient causes electrons to diffuse from the \( n\)-region to the \( p\)-region, resulting in a depletion region and an opposing electric field.