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Unformatted text preview: 2.(10%) Refer to problem 3 in HW I. If each gold atom donates one electron to the gold matrix at room temperature, estimate the electron concentration of gold. Is gold a conductor? 3. (10%)In practice we assume that the intrinsic Fermi level, Ei, coincides with the center of the band gap. In reality it is not true. Derive an expression relating the intrinsic level Ei to the center of the band gap. Find the displacement of Ei from the center of the band gap for both silicon and germanium at room temperature. The effective mass values are m n * = 0.55 m o for Ge and 1.1 m o for Si, m p * = 0.37 m o for Ge and 0.56m o for Si where m o is the free electron mass....
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- Spring '11