ECE103_midterm_1W09 solution

# ECE103_midterm_1W09 solution - Midterm Exam 1 ECE103...

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Midterm Exam 1 ECE103 2/3/09 ALLOWED: Calculators and one 8.5”x11 page of notes (one side). Note you are required to turn in your page of notes with our exam. NOT ALLOWED: Textbooks, class notes, problem sets, etc. ATTEMPT ALL PROBLEMS AND SHOW ALL WORK! This exam has a maximum score of 100 points. You have 80 minutes to complete this exam. q = 1.60x10 -19 C; k = 8.617x10 -5 eV/K; m 0 = 9.11x10 -31 kg; ε 0 = 8.85x10 -14 F/cm; 1 μ m = 1x10 -4 cm = 1x10 -6 m; n i (Si, T=300K) = 1.0x10 10 cm -3 ; E g (Si at T=300K) = 1.12 eV; n i (GaAs, T=300K) = 2.2x10 6 cm -3 ; E g (GaAs at T=300K) = 1.42 eV. 1. BE CONCISE and do not write an essay! The ideal answer for each may be stated in a few sentences. (a) [9 points] Define an insulator, semiconductor, and metal in terms of conductivity and bandgap. Draw the energy band diagrams for insulator, semiconductor and metal. (b) [8 points] What is the law of mass action? Why is it only valid for nondegenerate semiconductors? (c) [ 6 points] What is the charge neutrality relationship for Si at room temperature? 0K? and 800K? 2.

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