Homework3 - University of Delaware Department of Electrical...

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University of Delaware Department of Electrical and Computer Engineering ELEG620: Solar Electric Systems Homework #3 Solar Cells 1. Consider the cut-away of a textured pyramid surface shown below. For a given wavelength of light the fraction of reflected light is given by R. a) Find an expression for the total reflectivity of the light incident on the textured surface, in terms of both R and α , the angle of the pyramid side relative to a flat surface that is normal to the incident light. You can stop increasing the angle when 100% of incident light bounces three times. b) Given that the side of the pyramid is created in a (001) surface by exposing (111) planes, what is the angle α ? c) If the reflection is 20% at a particular wavelength then compute the reflectivity of the textured surface (use the angle from b)) 2. a) A silicon solar cell (band gap 1.12 eV) is uniformly illuminated by monochromatic light of wavelength 800 nm and intensity 20mW/cm 2 . Given that the quantum efficiency at this wavelength is 0.80 find the short circuit current if the area of the cell
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Homework3 - University of Delaware Department of Electrical...

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