n-type & p-type Challenge
25 NEET-standard questions on doping, n-type and p-type semiconductors, majority and minority carriers, donor and acceptor levels, charge neutrality and nenh = ni². Answer each one. If you get it wrong, Vidya Ma’am explains it with an animated movie you can control, a slider to play with, and a step-by-step solution. Then try again.
NCERT Physics XII Part II · Ch. 14 · pp. 329–332Keys: A–D or 1–4 to answer
🧠 Formula memory tricks (open before you start)
DopantsGroup V (P, As, Sb) → n-type · Group III (B, Al, In) → p-typesize must match the host; only ppm of dopant
n-typene ≫ nhdonor level just below EC; electrons majority
p-typenh ≫ neacceptor level just above EV; holes majority; one acceptor = one hole
Mass-action lawne nh = ni²more of one carrier means fewer of the other
NeutralityCrystal stays neutralfree carriers are balanced by fixed donor (+) or acceptor (−) cores
Energy gapsC 5.4 · Si 1.1 · Ge 0.7 · Sn 0 eVdonor energy ≈ 0.05 eV (Si), 0.01 eV (Ge)
right first tryfixed after explanationstill to fix
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