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Unformatted text preview: Department of Electrical and Computer Engineering UNIVERSITY OF BRITISH COLUMBIA EECE 480 MICROELECTRONIC DEVICES FINAL EXAM, December 06, 2006 Time: 2.5 hours ANSWER ALL QUESTIONS. All questions carry equal weight. No notes, programmable calculators or books allowed. This exam consists of 2 pages. 1. (a) Consider a metal/AlGaAs/GaAs HEMT with no spacer layer. The workfunctions of the metal, AlGaAs and GaAs can be taken as 3.5, 2, and 4 eV, respectively. The electron anities of the AlGaAs and GaAs are 1.5 and 3 eV, respectively. The bandgaps of the AlGaAs and GaAs are 4 and 2 eV, respectively. Draw energy band diagrams, showing to approximate scale in energy ( e.g. , 1 line spacing 1 eV), the zero- field- and local-vacuum levels, the conduction bands and valence bands for the two semiconductors, and the Fermi levels for the metal and the semiconductors: (i) for the three, separated components of the device; (ii) for the joined components at equilibrium....
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This note was uploaded on 11/10/2010 for the course EECE 480 taught by Professor David during the Fall '09 term at The University of British Columbia.
- Fall '09