Solar cell analysis system



The base doping can be determined from the plot of 1/C² versus voltage. The width of the space charge region of a silicon solar cell, Wj, depends on the base doping concentration and can be varied with an applied reverse voltage. The solar cell's capacitance is inversely proportional to Wj and can be measured from the phase and magnitude of the AC current that results when applying a sine modulated reverse voltage.

The base doping concentration must be known for

  • the calculation of base contribution to saturation current J0,base
  • the calculation of base contribution to series resistance
  • estimating the current limit for small local shunts due to spreading resistance in the base.