NEET 2008 Physics question
A p-n photodiode is made of a material with a band gap of 2.0 eV. The minimum frequency of the radiation that can be absorbed by the material is nearly
Answer: (3)
Solution
A photon can be absorbed (creating an electron-hole pair) only if its energy is at least the band gap: . \frac{E_g}{h}\frac{2.0 × 1.6×10^{-19}}{6.63×10^{-34}}$
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