Mass Action LawMediumQuestion 20208
Question
The mass action law for a semiconductor states that:
- An + p = constant
- Bn × p = nᵢ² (constant at a given temperature)Correct
- Cn/p = constant
- Dn − p = nᵢ
Correct answer
n × p = nᵢ² (constant at a given temperature)
Explanation
Mass action law: np = nᵢ² regardless of doping. For intrinsic semiconductor: n = p = nᵢ. For n-type: n ≈ Nd >> nᵢ, so p = nᵢ²/Nd << nᵢ. Minority carriers decrease as majority increase.