ENGRI_1110_hw3_2009

ENGRI_1110_hw3_2009 - ENGRI 1110 Homework #3 Due Wednesday,...

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ENGRI 1110 Homework #3 Due Wednesday, October 7, 2009 1. 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 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). Although we know the sun’s power as a function of photon energy will be
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This note was uploaded on 10/25/2009 for the course ENGRI 1110 at Cornell.

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ENGRI_1110_hw3_2009 - ENGRI 1110 Homework #3 Due Wednesday,...

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