List of top Physics Questions on Semiconductor

When Ge is doped with a pentavalent impurity, the energy required to free the weakly bound electron from the dopant is about:
Assertion (A): The temperature coefficient of resistance is positive for metals and negative for p-type semiconductors.
Reason (R): The charge carriers in metals are negatively charged, whereas the majority charge carriers in p-type semiconductors are positively charged.

Whether the \( p\text{-}n \) junction diode is forward biased or reverse biased in the given figure. 

What are forward biasing and reverse biasing in \( p\text{-}n \) junction? Explain the difference between forward current and reverse current.
What is the nature of n-type semiconductor?
Explain the differences between \( n \)-type and \( p \)-type semiconductors. Show that both types of semiconductors are electrically neutral.
Discuss the characteristics of (i) forward biasing and (ii) reverse biasing in \( p\)-\(n \) junction. Explain the cause of origin and direction of current in both conditions.