Answer Happy

= = 5. (10) A PV cell has an area of 75 cm2, a cell temperature of 27°C, and an Isc of 2.25A when illuminated with one sun. The cell has an ideality factor of 1.25, an No = 2X1018/cm", Na = 3X1015/cm3, and an ni = 101/cm3. The PV cell also has a minority electron lifetime of Tn = 25us; minority hole lifetime of Tp = 1.5us; a minority hole diffusion coefficient Dp 3 cm/s; and minority electron diffusion coefficient of Dn = 35 cm2/s; a) (5, 3) Determine the reverse saturation current and the open circuit voltage of the cell. Assume that Wp and Wn are long enough so that the surface effects of the front and back surface do not affect the reverse saturation current. b) (5, 3) Compute the power conversion efficiency when illuminated at 850 W/m2. Use accurate iterative methods for obtaining required parameters. c) Grad only (4) Compute the power conversion efficiency when illuminated at 850 W/m2 if the cell now has a parasitic series resistance of 0.0312. For this part you can use relatively accurate empirical relations for the l-V characteristics of the cell with series resistance.