Unformatted text preview: (c) Determine the required semiconductor thickness so that 95% of the incident photons are absorbed. 3. Solar Cell: Optimal Load Resistor: (40 points) A long silicon pn junction solar cell with an area of 2 cm 2 has the following parameters: N D = 10 19 cm-3 , D p = 6 cm 2 /s, p0 = 5 10-7 s, N A = 3 10 16 cm-3 , D n = 18 cm 2 /s, n0 = 5 10-6 s Assume that excess carriers are uniformly generated in the solar cell and that the photo-current density is J L = 25 mA/cm 2 . Let T = 300 K. (a) Plot the I-V characteristic of the diode. (b) Determine the maximum power output of the solar cell. (c) Calculate the external load resistance that will produce the maximum power. (d) If the solar intensity is increased by a factor of 10, determine the maximum power output of the solar cell. By what factor has the power increased?...
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- Spring '08
- Solar cell, P-n junction, 3 1016 cm