exam_mid-term_08

exam_mid-term_08 - EECE 480 Department of Electrical and...

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Department of Electrical and Computer Engineering UNIVERSITY OF BRITISH COLUMBIA EECE 480 SEMICONDUCTOR DEVICES: PHYSICS, DESIGN and ANALYSIS MID-TERM EXAM, October 23, 2008 Time: 1.25 hours The exam grade will be out of 20 marks, so it is possible to obtain a score of greater than 100%. Notes, books and simple calculators are allowed. Data-storage- or telecommunication-devices are not allowed. This exam consists of 2 pages. 1. [5 marks] Consider a heterojunction diode with a p- Al 0 . 3 Ga 0 . 7 As region, and an n + - GaAs region. Sketch the equilibrium energy band diagram for this diode. A vertical scale of 2 cm 1eV is recommended for showing E l ,E C and E V with respect to E 0 . The position of E F with respect to the band edges need only be approximate. The horizontal scale also need only be approximate. 2. [5 marks] The E-k relationships for the conduction bands of two semiconductor materials, A and B , each with spherical constant-energy surfaces, can be expressed as E A 0 . 7= α k 2 and E B 1 . 4=2
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exam_mid-term_08 - EECE 480 Department of Electrical and...

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