Question

5) A Si solar cell with junction cross sectional dimensions 2 cm ×2 cmis formed with Na 1018 cm3 on the p side and Nd 1018cm3 on the n side. It is operated at a temperature of 300 K and τn-tp-1 μ. a) Using the mobilities on the equation sheet, calculate the dark saturation current. b) An intrinsic region of thickness 200 μm is sandwiched between the p and n regions in order to enhance the active volume of the cell. By adding this thickness to the width of the junction at zero bias and the diffusion lengths (see equation on equation sheet), calculate the active volume of the cell at equilibruim. c) Calculate the light-generated current, the short-circuit current and the open-circuit voltage for this cell at an illumination level that gives an optical generation rate of 1018 EHP cm3s1.d) Numerically calculate the maximum power output of the cell at the illumination level of part (c). e) Calculate the power level of the photons falling on the cell at the illumination level of part (c) assuming the photons have an energy of 2 eV. f) Calculate the efficiency of the cell using the results of parts (d) and (e)

Answer 1

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