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Silicon has an absorption co-efficient of 850 cm-1 at a wavelength of 805 nm. Light of intensity 1 W/m2 at this wavelength is directed at normal incidence onto a polished silicon wafer of thickness 0.5 mm.

a. Assuming a top surface reflectance of 30%, calculate the photon flux in units of photons/m2/s at a depth of 20 microns.

b. Calculate the generation rate of e-h pairs per unit volume at this depth.

c. The reverse of generation can also happen: Recombination in the bulk or at the surface. Describe using an energy band diagram three types of recombination in solar cells.

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