867f09hw7 - maximum power point. Make reasonable estimates...

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ELEG 867 - Devices for Light Detection from the Submillimeter to the Ultraviolet – Fall 2009 Homework #7 - due Friday, 23 October 2009, in class Solar Cells 1. A Ge cell with area 5 cm 2 has a dark reverse saturation current of 2 nA. AM1.5 illumination produces 4E17 cm -3 s -1 EHPs. The electron and hole diffusions lengths are 5 μ m each, and the depletion width is negligible. Calculate the I SC and V OC of this cell. Assuming a fill factor of 0.8, what is the conversion efficiency of this cell? 2. For the Ge cell in problem 1, estimate the optimum load resistance so that the cell will operate near the
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Unformatted text preview: maximum power point. Make reasonable estimates using the information provided and justify your answer. 3. Assume that this Ge cell now operates in an optical system with 10x concentration – i.e. 10 suns. Calculate the new conversion efficiency, assuming that the Fill Factor and the temperature of the cell do not change. Homework assignments will appear on the web at: http://www.ece.udel.edu/~kolodzey/courses/eleg867f09.html. Note: On each homework and report submission, please give your name, the due date, assignment number and the course number....
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This note was uploaded on 12/14/2011 for the course ELEG 687 taught by Professor Kolodzey during the Fall '09 term at University of Delaware.

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