alleryStart learning →Mass-action law in semiconductors:
An = p
Bn + p = constant
Cn × p = n_i² (regardless of doping)
Dn - p = 0
Answer & Solution
Correct answer: C. n × p = n_i² (regardless of doping)
**Law of mass action:** n × p = n_i² (constant at given temperature).
**For n-type:** n ≈ N_d, p = n_i²/N_d (small).
**For p-type:** p ≈ N_a, n = n_i²/N_a.
Independent of doping level.
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