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HW3SolutionsFall2009

# HW3SolutionsFall2009 - MSE 1110/ENGRI1110 Homework#3...

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MSE 1110/ENGRI1110 Homework #3 Solutions Fall 2009 1. (15) Solar cell A uses a semiconductor with a band gap of 1 eV. Solar cell B uses a semiconductor with a band gap of 2 eV. Either cell is thick enough to absorb all the light above its band gap. Both cells can work simultaneously with one on the top of the other to operate more efficiently in a small space. a) Which cell has to be on top (first to receive the sunlight) for both to work simultaneously, and why? b) It is more realistic to assume that a solar cell made of a particular semiconductor operates efficiently over some range of photon energies (see Slide 21 of Lecture 13). So assume that Solar cell A absorbs all the

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light above 1 eV but only converts 15% of the sun’s power in the range from 1 eV and 2.5 eV to electrical power (there is no power conversion outside this range). Assume that cell B absorbs all the light above 2 eV but only converts 5% of the sun’s power in the range from 2 eV to 3.5 eV to electrical power (there is no power conversion outside this range).
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HW3SolutionsFall2009 - MSE 1110/ENGRI1110 Homework#3...

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