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Unformatted text preview: Ωcm at T = 300K. a.) What is the donor impurity concentration? B.) What is the expected resistivity of the material at T = 200K and T = 400K? 4. Two scattering mechanisms exist in a semiconductor. If only the first mechanism were present the mobility of the semiconductor would be 250 cm 2 / Vs. If only the second mechanism were present the mobility would be 500 cm 2 /Vs. What is the mobility when both mechanisms are present? 5. The electron density in a semiconductor decreases linearly from 10 16 cm3 to 10 15 cm3 over a distance of 0.1 cm. The electron diffusion coefficient is 25 cm 2 /s. Calculate the electron diffusion current density. 6. Problem 4.41 in Neamen. 7. Problem 4.45 in Neamen. 8. Problem 4.51 in Neamen....
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This note was uploaded on 04/04/2010 for the course EE 338 taught by Professor Dapkus during the Spring '07 term at USC.
 Spring '07
 Dapkus

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