Unformatted text preview: 17 1/cm 3 of Boron? How far is the Fermi level from the conduction band, assuming the bandgap of silicon is 1.1 eV? Question 4 (10 points): A Si sample is doped with 6 X 10 15 cm3 donors and 2 X 10 15 cm3 acceptors. Find the position of the Fermi level with respect to E i at 300 K. Question 5 (15 points): Solar cell problem: Fig 1 shows the solar spectral irradiance area (unit: W/m 2 nm) vs different wavelengths (unit: nm). Please calculate the percentage of the sun’s power that will be absorbed into the material with E G = 1.24eV)....
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 Spring '09
 A
 Energy, Volt, Condensed matter physics, Fermi level

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