Facility to measure solar cell ac parameters using an impedance spectroscopy technique

An experimental setup has been developed to measure the solar cell ac parameters using an impedance spectroscopy technique. It consists of an electrochemical interface to set the dc bias voltage and to apply the signal voltage across the solar cell and a frequency response analyzer to generate the excitation signal with varying frequency and analyze the result. The setup is calibrated with a standard RC network and measured an error of +/-4% (maximum). Solar cell capacitance, parallel resistance and series resistance are calculated from the measured data