Measurement of Component Cell Current-Voltage Characteristics in a Tandem- Junction Two-Terminal Solar Cell

A new method for measuring component cell current-voltage (I-V) characteristics in a tandem-junction two-terminal solar cell is described. The measurements are performed with (a-Si/a-SiGe) tandem structure solar cell using two separate light beams of different wavelengths. The I-V characteristics of the compone nt cells are obtained and open-circuit voltage (Voc), short-circuit current (Isc) and fill-factor (FF) are calculated. This method could be a useful tool for evaluation and optimization of multijunction solar cells.