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Intrinsic carrier concentration of Si at 300 K is approximately:
A10⁶ /m³
B10²⁰ /m³
C10²⁸ /m³
D1.5 × 10¹⁶ /m³
Answer & Solution
Correct answer: D. 1.5 × 10¹⁶ /m³
n_i for Si ≈ 1.5 × 10¹⁰ /cm³ = 1.5 × 10¹⁶ /m³. Strongly T-dependent: exp(-E_g/2kT). Far below metal carrier density (~10²⁸/m³), which is why Si is much less conductive than copper.
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