quiz10fall99 - 0.604 0.648 0.012 0.04 0.08 0.015 0.026 0.17...

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, ENGSC 3313, Fall 1999 Quiz 10 Name Ref Example 11-3.2, text, 1 F(E) = 1 + eE-Ef/kT Substituting, F(E) = 2.72 x 10-4 2. Copper often contains small quantities of dissolved oxygen. Why does this decrease the electrical conductivity somewhat? Also, deduce why the addition of small quantities of phosphorus to such a copper would improve the conductivity . You mayor may not create an n-type semiconductor by doping GaAs with Si, because .You would be certain of obtaining an n-type semiconductor if you doped GaAs 3 with
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TABLE 11-4.2 Properties of Common Semiconducton (20. C)* ENERGY GAPE, MOBIunES, m'/V., ELECTRON, Jl. HOLE, 1'. 10-"1 MATERIAL .v note that nm = IO-9m -6 1.1 0.7 0.1 0.17 0.19 0.36 0.20 0.12 0.0425 0.23 0.10 <10-1' S X 10-. 2 la' 0.357 0.543 0.566 0.649 ~ ...~ , 1.6 2.3 1.4 0.7 1.3 0.36 0.18 3.7 3 0.02 0.019 0.88 0.60 0.47 2.26 8.2 0.014 0.01 0.613 0.545 0.565 0.612 0.587
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Unformatted text preview: 0.604 0.648 0.012 0.04 0.08 0.015 0.026 0.17 0.0005 0.002 10-' 500 10" , , aV3' 4 , \ , \ How many electrons have jumped the band gap of gray tin at 20°C? The charge on an electron is 1.6. 10-19 C. Use Table on question 4. 5. 0" = nq (J.1e + ~p) Using data from table 106 = n 1.6 x 10-19 (0.20 + 0.10) n = 2.08 x 1025 You wish to construct a thermistor from an intrinsic semiconductor such that the conductivity will increase 100% between 100°C and 110°C. What should the energy gap be in e V? k = 8.61 X 10-5 e V /k. 6. Germanium has a "diamond" cubic crystal structure. It is FCC with 4 additional interior atoms as shown, making 8 atoms per unit cell. How many germanium atoms are there per cubic meter? Volume a3 contains 8 atoms...
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