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EE3114 Hwk 1 Semiconductor Physics

EE3114 Hwk 1 Semiconductor Physics - EE3114 Hwk#1...

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EE3114 Hwk #1 Semiconductor Physics and pn Junctions PROBLEMS Due 1 week Read textbook chapter sections 1.1, 1.2, 1.3 1) Intrinsic Semiconductors: Plot the intrinsic carrier concentration, η i , over a temperature range of -40 o C to +60 o C. Use a software tool, such as Excel, Matlab or other, to plot the temperature on the x-axis and η i on the y-axis. Use a LOG scale for the y-axis. Perform this calculation for the following two semiconductor materials and plot both curves on the same graph. Submit the plot(s). a. silicon (Si) b. gallium arsenide (GaAs) 2) Intrinsic Semiconductors: Find the concentration of electrons and holes in a silicon semiconductor that has 10 15 cm -3 donor atoms. The temperature is 300 o K. Is this an “n- type” or “p-type” semiconductor? 3) pn Junctions: Determine the built-in potential, V bi , for a silicon pn junction for the following three cases. Use T=300 o K. a. N a = N d = 5 x 10 15 cm -3 b. N a = 10 15 cm -3 and N d = 5 x 10 17 cm -3 c. N a = N d = 10 18 cm -3 4) pn Junctions: Determine the junction capacitance for the following three cases. For the
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