NEET UG PHYSICS MCQ: SEMI CONDUCTOR DEVICES

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A photodetector used to detect the wavelength of 1700 nm, has energy gap of about

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Correct option: D

0.73 eV

Option D (0.73 eV) is correct because it is the approximate energy gap calculated using

E = \frac{{1.24 eV \cdot \mu m}}{\lambda}

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I = A{T^2}{e^{q/{V_L}}}

{V_L}

\sqrt{n}.

n

p - n\;

{10^{17}}\mathrm{c}{\mathrm{m}^{ - 3}}

P

{10^{16}}

\mathrm{c}{\mathrm{m}^{ - 3}}

N

kT =

{n_i} = 1.4 \times {10^{10}}

\mathrm{c}{\mathrm{m}^{ - 3}}