EL ENG 130 Study Guide - Midterm Guide: One Sheet, Electric Field, Band Diagram
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Show all your work in order to receive partial credit. Make sure everything is on the exam papers. There are a total of 10 pages of this exam including this page. This problem concerns a specimen of gallium arsenide, gaas, which has 2x10. 3 donors and an unknown number of acceptors. A measurement is made on the cm specimen and it is found that it is p-type with an equilibrium hole concentration, p. At room temperature in gaas, the intrinsic carrier concentration, n. , is 10 min: [6 pts] what is the net acceptor concentration, n (= n. ), in this sample, and what is the total acceptor concentration, n a. 3: [6 pts] what is the equilibrium electron concentration, n. , in this sample at room o temperature? n0= What are the excess hole and electron concentrations, 3: temperature dependence of carrier concentrations and mobility [15 pts] A silicon wafer is moderately doped with arsenic.
