Solve the Electronics and Telecommunication Engineering (Conventional) Question Paper of 2011 Engineering Services Examination.
2. (a) Derive one-dimensional continuity equation for holes in a semiconductor. Reduce this expression to the standard diffusion equation by assuming that drift is negligible and there is no generation in the region. 10
(b) Obtain expressions for short circuit current and open circuit voltage in an illuminated p-n junction. Explain how an illuminated p-n junction can be used as a photodetector or a photo-cell. 15
(c) Sketch the energy-band diagram of an ideal MOS capacitor at equilibrium. Explain with energy band diagram the following modes of operation of a MOS capacitor.
(iii) inversion 10
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