(Solved): A silicon pn photodiode with a depletion layer width W=50m, and the thickness of the undeplet ...

A silicon $$\mathrm{p}?\mathrm{n}$$ photodiode with a depletion layer width $$\mathrm{W}=50?\mathrm{m}$$, and the thickness of the undepleted p-type region is $$w=4?\mathrm{m}$$ (see Fig.5-12). Calculate the total quantum efficiency and spectral sensitivity at $$?=800$$ and at $$?=1000\mathrm{nm}$$. (Assume diffusion lengths $$\mathrm{Ln}=3?\mathrm{m},\mathrm{Lp}=10?\mathrm{m}$$ ) for: a) an exposed $$\mathrm{Si}$$-air entrance window b) a $$\mathrm{SiO}2/\mathrm{Si}$$ entrance window (From Donati Chapter 5 on Photodiodes)