Unformatted text preview: The current voltage characteristics are defined by the standard equation: I = I o exp( eV / k B T ) − 1 [ ] , where the symbols have their usual meaning. In the presence of light with energy greater than the bandgap of the semiconductor, the preceding equation is modified by the addition of a term α G, where G is the solar intensity and α some positive constant, as follows: I = I o exp( eV / k B T ) − 1 [ ] − α G . a. Explain the minus sign in front of α G. b. Starting with the above expression, show that at sufficiently high solar intensities that the voltage output under open circuit conditions (I=0) is related to the solar intensity by V = k B T e ln G I o ....
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 Spring '10
 MatSci
 Light, Solar cell, solar cells, Band gap, Cook Hall, Callister Question

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