Question

In intrinsic semiconductor at room temperature, the number of electrons and holes are:
1. Equal
2. Zero
3. Number of electrons is more than number of holes
4. Number of holes is more than number of electrons

Answer 1

Correct Answer - Option 1 : Equal

CONCEPT:

Semiconductor: 

• Semiconductors are the materials that have a conductivity between conductors and insulators.
  • Semiconductors are made of compounds such as gallium arsenide or pure elements, such as germanium or silicon.
• Holes and electrons are the types of charge carriers accountable for the flow of current in semiconductors. 
  • ​Holes (valence electrons) are the positively charged electric charge carrier whereas electrons are the negatively charged particles.

EXPLANATION:

• Intrinsic semiconductors are made of pure elements.
• Since no impurity is mixed in the intrinsic semiconductors, so the numbers of electrons and holes remain equal in an intrinsic semiconductor.
• Hence, option 1 is correct.