6. (5,10) Consider a PV cell similar to that in Problem 5 with No = 2X1018/cm3, Na = 3X1015/cm", ni = 101/cm?, operating

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6 5 10 Consider A Pv Cell Similar To That In Problem 5 With No 2x1018 Cm3 Na 3x1015 Cm Ni 101 Cm Operating 1 (281.75 KiB) Viewed 52 times

6. (5,10) Consider a PV cell similar to that in Problem 5 with No = 2X1018/cm3, Na = 3X1015/cm", ni = 101/cm?, operating at a temperature of 27°C, and an ideality factor of 1.25. For this cell the density of states in the conduction band is 3.22X1019/cm3 and 1.83X1019/cm3 in the valence band. a. (2,1) Should this PV cell be represented with a single or two-diode model? Why? Draw an appropriate diagram for the model. b. (3,2) When the PV cell is not illuminated, compute values for the change in energy (in eV) of the conduction and valence bands across the junction (i.e. from – Xn to Xp). c. Grad only (5) Compute the position of the Fermi level relative the conduction and valence bands in the quasi neutral regions of the cell. d. Grad only (2) Draw a relatively accurate sketch of the energy bands, Fermi level, and Ei from -Wn to Wp.