Doping

n-type and p-type

An interactive lesson with 6 steps, about 5 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• n-type: 5-electron dopants (P, As) donate free electrons.
• p-type: 3-electron dopants (B, Ga) create holes.
• Doped crystals stay electrically neutral overall.

Steps

1. A pinch of impurity
2. Arsenic
3. A little goes a long way
4. Minority carriers
5. A pinch of phosphorus
6. Is doped silicon charged?