Question

For the same dopant concentration, the n–type silicon semiconductor has _____________ as compared to a p–type silicon semiconductor. 

(1) Higher conductivity 

(2) Higher resistivity

(3) Lower mobility 

(4) Lower net charge

Answer 1

Correct option: (1) Higher conductivity

Explanation: 

For the silicon semiconductor, Mobility of electrons = µ_e = 1350 cm² V^–1 sec^–1 

Mobility of holes = µ_n = 480 cm² V^–1 sec^–1 

Conductivity of electrons = σ = n x q x µ_e

Conductivity of holes = σ = n x q x µ_n

Now, since dopant concentration is same, 

Concentration of electrons (n) = concentration of holes (p) 

Conductivity of n–type sample is more than p–type sample.