Answer: Holes.
- A Free electrons
- B Holes
- C Cations
- D Anions
Correct answer: B. Holes
Explanation: Boron has only 3 valence electrons; it creates electron-deficient sites (holes) in the silicon lattice. Holes are the majority charge carriers in p-type semiconductors.
The three cubic unit cells: Simple Cubic has atoms only at corners; Body-Centred adds one atom at the centre; Face-Centred adds one atom at the centre of each of the 6 faces, giving the highest packing efficiency.
Concept context
Explore the ordered world of crystalline solids: unit cells, packing, defects, and how structure determines electrical and magnetic properties.