EL ENG 130 Study Guide - Midterm Guide: One Sheet, Electronvolt, Gallium Arsenide
Document Summary
One sheet of notes is allowed: show all your work in order to receive partial credit, include correct units when appropriate, make sure everything is on the exam papers. Work on additional papers will not be accepted: there are a total of 10 pages of this exam including this page. This problem concerns a specimen of gallium arsenide, gaas, which has 2x1017 cm-3donors and an unknown number of acceptors. A measurement is made on the specimen and it is found that it is p-type with an equilibrium hole concentration, p , of. At room temperature in gaas, the intrinsic carrier concentration, n. , is 10 cm , the hole. 2 mobility, j. io,is 300 cm n-s, and the electron mobility, ile" is 4000 cm n-s. ~ xi0 (1m: [6 pts] calculate ef - ej in this sample at room temperature. f if % 10 4- 10) s ) ~ - ~ 4).
